diff --git a/README.md b/README.md
index 400c8a5..2f51477 100644
--- a/README.md
+++ b/README.md
@@ -72,21 +72,39 @@ All persistent variants are optimized for larger sized indexes under heavy workl
 
 ### Example Node.js
 
-- [nodejs-document](example/nodejs-document)
-  - [commonjs](example/nodejs-document/commonjs)
-  - [esm](example/nodejs-document/esm)
-- [nodejs-persistent](example/nodejs-persistent)
-  - [commonjs](example/nodejs-persistent/commonjs)
-  - [esm](example/nodejs-persistent/esm)
-- [nodejs-worker](example/nodejs-worker)
-  - [commonjs](example/nodejs-worker/commonjs)
-  - [esm](example/nodejs-worker/esm)
-- [nodejs-worker-persistent](example/nodejs-worker-persistent)
-  - [commonjs](example/nodejs-worker-persistent/commonjs)
-  - [esm](example/nodejs-worker-persistent/esm)
+- [nodejs-commonjs](example/nodejs-commonjs):
+  - [document](example/nodejs-commonjs/document)
+  - [document-persistent](example/nodejs-commonjs/document-persistent)
+  - [document-worker](example/nodejs-commonjs/document-worker)
+  - [document-worker-extern-config](example/nodejs-commonjs/document-worker-extern-config)
+- [nodejs-esm](example/nodejs-esm):
+  - [document](example/nodejs-esm/document)
+  - [document-persistent](example/nodejs-esm/document-persistent)
+  - [document-worker](example/nodejs-esm/document-worker)
+  - [document-worker-extern-config](example/nodejs-esm/document-worker-extern-config)
+  - [language-packs](example/nodejs-esm/language-packs)
 
 ### Example Browser
 
+- [browser-legacy](example/browser-legacy):
+  - [basic](example/browser-legacy/basic)
+  - [basic-persistent](example/browser-legacy/basic-persistent)
+  - [basic-suggestion](example/browser-legacy/basic-suggestion)
+  - [basic-worker](example/browser-legacy/basic-worker)
+  - [document](example/browser-legacy/document)
+  - [document-persistent](example/browser-legacy/document-persistent)
+  - [document-worker](example/browser-legacy/document-worker)
+- [browser-module](example/browser-module):
+  - [basic](example/browser-module/basic)
+  - [basic-persistent](example/browser-module/basic-persistent)
+  - [basic-suggestion](example/browser-module/basic-suggestion)
+  - [basic-worker](example/browser-module/basic-worker)
+  - [basic-worker-extern-config](example/browser-module/basic-worker-extern-config)
+  - [document](example/browser-module/document)
+  - [document-persistent](example/browser-module/document-persistent)
+  - [document-worker](example/browser-module/document-worker)
+  - [document-worker-extern-config](example/browser-module/document-worker-extern-config)
+
 ```js
 import FlexSearchIndex from "./index.js";
 import Database from "./db/indexeddb/index.js";
diff --git a/dist/flexsearch.bundle.debug.js b/dist/flexsearch.bundle.debug.js
index cf9e343..b5e056f 100644
--- a/dist/flexsearch.bundle.debug.js
+++ b/dist/flexsearch.bundle.debug.js
@@ -1498,7 +1498,6 @@ function W(a = {}) {
   let c = "undefined" !== typeof self ? self._factory : "undefined" !== typeof window ? window._factory : null;
   c && (c = c.toString());
   const d = "undefined" === typeof window, e = this, f = Pa(c, d, a.worker);
-  f.worker = !0;
   return f.then ? f.then(function(g) {
     return b.call(e, g);
   }) : b.call(this, f);
@@ -1522,7 +1521,8 @@ function X(a) {
   };
 }
 function Pa(a, b, c) {
-  return b ? "undefined" !== typeof module ? new (require("worker_threads")["Worker"])(__dirname + "/node/node.js") : import("worker_threads").then(function(worker){ return new worker["Worker"]((1,eval)("import.meta.dirname") + "/node/node.mjs"); }) : a ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + Na.toString()], {type:"text/javascript"}))) : new window.Worker(B(c) ? c : (0,eval)("import.meta.url").replace("/worker.js", "/worker/worker.js"), {type:"module"});
+  return b ? "undefined" !== typeof module ? new (require("worker_threads")["Worker"])(__dirname + "/node/node.js") : import("worker_threads").then(function(worker){ return new worker["Worker"]((1,eval)("import.meta.dirname") + "/node/node.mjs"); }) : a ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + Na.toString()], {type:"text/javascript"}))) : new window.Worker(B(c) ? c : (0,eval)("import.meta.url").replace("/worker.js", "/worker/worker.js").replace("flexsearch.bundle.module.min.js", 
+  "module/worker/worker.js"), {type:"module"});
 }
 ;Y.prototype.add = function(a, b, c) {
   C(a) && (b = a, a = ca(b, this.key));
diff --git a/dist/flexsearch.bundle.min.js b/dist/flexsearch.bundle.min.js
index 53aaf64..ddf9803 100644
--- a/dist/flexsearch.bundle.min.js
+++ b/dist/flexsearch.bundle.min.js
@@ -56,10 +56,10 @@ u.import=function(a,b){if(b)switch(B(b)&&(b=JSON.parse(b)),a){case "cfg":this.h=
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+window._factory:null;c&&(c=c.toString());const d="undefined"===typeof window,e=this,f=Pa(c,d,a.worker);return f.then?f.then(function(g){return b.call(e,g)}):b.call(this,f)}X("add");X("append");X("search");X("update");X("remove");
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-function Pa(a,b,c){return b?"undefined"!==typeof module?new (require("worker_threads")["Worker"])(__dirname + "/node/node.js"):import("worker_threads").then(function(worker){ return new worker["Worker"]((1,eval)("import.meta.dirname") + "/node/node.mjs"); }):a?new window.Worker(URL.createObjectURL(new Blob(["onmessage="+Na.toString()],{type:"text/javascript"}))):new window.Worker(B(c)?c:(0,eval)("import.meta.url").replace("/worker.js","/worker/worker.js"),{type:"module"})}
-;Y.prototype.add=function(a,b,c){C(a)&&(b=a,a=ca(b,this.key));if(b&&(a||0===a)){if(!c&&this.reg.has(a))return this.update(a,b);for(let h=0,k;h<this.field.length;h++){k=this.G[h];var d=this.index.get(this.field[h]);if("function"===typeof k){var e=k(b);e&&d.add(a,e,!1,!0)}else if(e=k.I,!e||e(b))k.constructor===String?k=[""+k]:B(k)&&(k=[k]),Qa(b,k,this.K,0,d,a,k[0],c)}if(this.tag)for(d=0;d<this.F.length;d++){var f=this.F[d];e=this.tag.get(this.N[d]);let h=z();if("function"===typeof f){if(f=f(b),!f)continue}else{var g=
+function Pa(a,b,c){return b?"undefined"!==typeof module?new (require("worker_threads")["Worker"])(__dirname + "/node/node.js"):import("worker_threads").then(function(worker){ return new worker["Worker"]((1,eval)("import.meta.dirname") + "/node/node.mjs"); }):a?new window.Worker(URL.createObjectURL(new Blob(["onmessage="+Na.toString()],{type:"text/javascript"}))):new window.Worker(B(c)?c:(0,eval)("import.meta.url").replace("/worker.js","/worker/worker.js").replace("flexsearch.bundle.module.min.js",
+"module/worker/worker.js"),{type:"module"})};Y.prototype.add=function(a,b,c){C(a)&&(b=a,a=ca(b,this.key));if(b&&(a||0===a)){if(!c&&this.reg.has(a))return this.update(a,b);for(let h=0,k;h<this.field.length;h++){k=this.G[h];var d=this.index.get(this.field[h]);if("function"===typeof k){var e=k(b);e&&d.add(a,e,!1,!0)}else if(e=k.I,!e||e(b))k.constructor===String?k=[""+k]:B(k)&&(k=[k]),Qa(b,k,this.K,0,d,a,k[0],c)}if(this.tag)for(d=0;d<this.F.length;d++){var f=this.F[d];e=this.tag.get(this.N[d]);let h=z();if("function"===typeof f){if(f=f(b),!f)continue}else{var g=
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diff --git a/dist/flexsearch.bundle.module.debug.js b/dist/flexsearch.bundle.module.debug.js
index 98f6e16..80c4f1c 100644
--- a/dist/flexsearch.bundle.module.debug.js
+++ b/dist/flexsearch.bundle.module.debug.js
@@ -1497,7 +1497,6 @@ function W(a = {}) {
   let c = "undefined" !== typeof self ? self._factory : "undefined" !== typeof window ? window._factory : null;
   c && (c = c.toString());
   const d = "undefined" === typeof window, e = this, f = Pa(c, d, a.worker);
-  f.worker = !0;
   return f.then ? f.then(function(g) {
     return b.call(e, g);
   }) : b.call(this, f);
@@ -1521,7 +1520,8 @@ function X(a) {
   };
 }
 function Pa(a, b, c) {
-  return b ? "undefined" !== typeof module ? new (require("worker_threads")["Worker"])(__dirname + "/node/node.js") : import("worker_threads").then(function(worker){ return new worker["Worker"](import.meta.dirname + "/node/node.mjs"); }) : a ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + Na.toString()], {type:"text/javascript"}))) : new window.Worker(B(c) ? c : import.meta.url.replace("/worker.js", "/worker/worker.js"), {type:"module"});
+  return b ? "undefined" !== typeof module ? new (require("worker_threads")["Worker"])(__dirname + "/node/node.js") : import("worker_threads").then(function(worker){ return new worker["Worker"](import.meta.dirname + "/node/node.mjs"); }) : a ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + Na.toString()], {type:"text/javascript"}))) : new window.Worker(B(c) ? c : import.meta.url.replace("/worker.js", "/worker/worker.js").replace("flexsearch.bundle.module.min.js", 
+  "module/worker/worker.js"), {type:"module"});
 }
 ;Y.prototype.add = function(a, b, c) {
   C(a) && (b = a, a = ca(b, this.key));
diff --git a/dist/flexsearch.bundle.module.min.js b/dist/flexsearch.bundle.module.min.js
index d19c6a8..913fbbb 100644
--- a/dist/flexsearch.bundle.module.min.js
+++ b/dist/flexsearch.bundle.module.min.js
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 f.I;if(g&&!g(b))continue;f.constructor===String&&(f=""+f);f=ca(b,f)}if(e&&f){B(f)&&(f=[f]);for(let k=0,l,m;k<f.length;k++)if(l=f[k],!h[l]&&(h[l]=1,(g=e.get(l))?m=g:e.set(l,m=[]),!c||!m.includes(a))){if(m.length===2**31-1){g=new J(m);if(this.fastupdate)for(let n of this.reg.values())n.includes(m)&&(n[n.indexOf(m)]=g);e.set(l,m=g)}m.push(a);this.fastupdate&&((g=this.reg.get(a))?g.push(m):this.reg.set(a,[m]))}}}if(this.store&&(!c||!this.store.has(a))){let h;if(this.C){h=z();for(let k=0,l;k<this.C.length;k++){l=
 this.C[k];if((c=l.I)&&!c(b))continue;let m;if("function"===typeof l){m=l(b);if(!m)continue;l=[l.U]}else if(B(l)||l.constructor===String){h[l]=b[l];continue}Ra(b,h,l,0,l[0],m)}}this.store.set(a,h||b)}}return this};function Ra(a,b,c,d,e,f){a=a[e];if(d===c.length-1)b[e]=f||a;else if(a)if(a.constructor===Array)for(b=b[e]=Array(a.length),e=0;e<a.length;e++)Ra(a,b,c,d,e);else b=b[e]||(b[e]=z()),e=c[++d],Ra(a,b,c,d,e)}
 function Qa(a,b,c,d,e,f,g,h){if(a=a[g])if(d===b.length-1){if(a.constructor===Array){if(c[d]){for(b=0;b<a.length;b++)e.add(f,a[b],!0,!0);return}a=a.join(" ")}e.add(f,a,h,!0)}else if(a.constructor===Array)for(g=0;g<a.length;g++)Qa(a,b,c,d,e,f,g,h);else g=b[++d],Qa(a,b,c,d,e,f,g,h);else e.db&&e.remove(f)};Y.prototype.search=function(a,b,c,d){c||(!b&&C(a)?(c=a,a=""):C(b)&&(c=b,b=0));let e=[],f=[],g;let h;let k;let l,m=0;if(c){c.constructor===Array&&(c={index:c});a=c.query||a;g=c.pluck;h=c.merge;k=g||c.field||c.index;var n=this.tag&&c.tag;var q=this.store&&c.enrich;var r=c.suggest;b=c.limit||b;l=c.offset||0;b||(b=100);if(n&&(!this.db||!d)){n.constructor!==Array&&(n=[n]);var p=[];for(let w=0,v;w<n.length;w++)if(v=n[w],v.field&&v.tag){var t=v.tag;if(t.constructor===Array)for(var x=0;x<t.length;x++)p.push(v.field,
diff --git a/dist/flexsearch.es5.debug.js b/dist/flexsearch.es5.debug.js
index 7b43969..247c41c 100644
--- a/dist/flexsearch.es5.debug.js
+++ b/dist/flexsearch.es5.debug.js
@@ -2391,7 +2391,6 @@ function qb(a) {
   var c = "undefined" !== typeof self ? self._factory : "undefined" !== typeof window ? window._factory : null;
   c && (c = c.toString());
   var d = "undefined" === typeof window, e = this, g = rb(c, d, a.worker);
-  g.worker = !0;
   return g.then ? g.then(function(f) {
     return b.call(e, f);
   }) : b.call(this, g);
@@ -2418,7 +2417,8 @@ function sb(a) {
   };
 }
 function rb(a, b, c) {
-  return b ? "undefined" !== typeof module ? new (require("worker_threads")["Worker"])(__dirname + "/node/node.js") : import("worker_threads").then(function(worker){ return new worker["Worker"]((1,eval)("import.meta.dirname") + "/node/node.mjs"); }) : a ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + ob.toString()], {type:"text/javascript"}))) : new window.Worker(M(c) ? c : (0,eval)("import.meta.url").replace("/worker.js", "/worker/worker.js"), {type:"module"});
+  return b ? "undefined" !== typeof module ? new (require("worker_threads")["Worker"])(__dirname + "/node/node.js") : import("worker_threads").then(function(worker){ return new worker["Worker"]((1,eval)("import.meta.dirname") + "/node/node.mjs"); }) : a ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + ob.toString()], {type:"text/javascript"}))) : new window.Worker(M(c) ? c : (0,eval)("import.meta.url").replace("/worker.js", "/worker/worker.js").replace("flexsearch.bundle.module.min.js", 
+  "module/worker/worker.js"), {type:"module"});
 }
 ;Z.prototype.add = function(a, b, c) {
   N(a) && (b = a, a = xa(b, this.key));
diff --git a/dist/flexsearch.es5.min.js b/dist/flexsearch.es5.min.js
index 712e849..a5401ad 100644
--- a/dist/flexsearch.es5.min.js
+++ b/dist/flexsearch.es5.min.js
@@ -88,10 +88,10 @@ u.serialize=function(a){a=void 0===a?!0:a;if(!this.reg.size)return"";for(var b="
 g+"]]";d+=(d?",":"")+g}d="index.map=new Map(["+d+"]);";e="";h=x(this.ctx.entries());for(f=h.next();!f.done;f=h.next())for(g=f.value,f=g[0],g=x(g[1].entries()),k=g.next();!k.done;k=g.next()){l=k.value;k=l[0];l=l[1];m="";n=0;for(var p;n<l.length;n++){p=l[n]||[""];for(var q="",r=0;r<p.length;r++)q+=(q?",":"")+("string"===c?'"'+p[r]+'"':p[r]);q="["+q+"]";m+=(m?",":"")+q}m='new Map([["'+k+'",['+m+"]]])";m='["'+f+'",'+m+"]";e+=(e?",":"")+m}e="index.ctx=new Map(["+e+"]);";return a?"function inject(index){"+
 b+d+e+"}":b+d+e};Ya(V.prototype);function ob(a){var b,c,d,e,h,f,g,k;return H(function(l){a=a.data;b=self._index;c=a.args;d=a.task;switch(d){case "init":e=a.options||{};(h=e.config)&&(e=(await import(h))["default"]);(f=a.factory)?(Function("return "+f)()(self),self._index=new self.FlexSearch.Index(e),delete self.FlexSearch):self._index=new V(e);postMessage({id:a.id});break;default:g=a.id,k=b[d].apply(b,c),postMessage("search"===d?{id:g,msg:k}:{id:g})}l.h=0})};var pb=0;
 function qb(a){function b(f){function g(k){k=k.data||k;var l=k.id,m=l&&e.h[l];m&&(m(k.msg),delete e.h[l])}this.worker=f;this.h=L();if(this.worker){d?this.worker.on("message",g):this.worker.onmessage=g;if(a.config)return new Promise(function(k){e.h[++pb]=function(){k(e)};e.worker.postMessage({id:pb,task:"init",factory:c,options:a})});this.worker.postMessage({task:"init",factory:c,options:a});return this}}a=void 0===a?{}:a;if(!this)return new qb(a);var c="undefined"!==typeof self?self._factory:"undefined"!==
-typeof window?window._factory:null;c&&(c=c.toString());var d="undefined"===typeof window,e=this,h=rb(c,d,a.worker);h.worker=!0;return h.then?h.then(function(f){return b.call(e,f)}):b.call(this,h)}sb("add");sb("append");sb("search");sb("update");sb("remove");
+typeof window?window._factory:null;c&&(c=c.toString());var d="undefined"===typeof window,e=this,h=rb(c,d,a.worker);return h.then?h.then(function(f){return b.call(e,f)}):b.call(this,h)}sb("add");sb("append");sb("search");sb("update");sb("remove");
 function sb(a){qb.prototype[a]=qb.prototype[a+"Async"]=function(){var b=this,c=arguments,d,e,h,f,g;return H(function(k){d=b;e=[].slice.call(c);h=e[e.length-1];"function"===typeof h&&(f=h,e.splice(e.length-1,1));g=new Promise(function(l){d.h[++pb]=l;d.worker.postMessage({task:a,id:pb,args:e})});return f?(g.then(f),k.return(b)):k.return(g)})}}
-function rb(a,b,c){return b?"undefined"!==typeof module?new (require("worker_threads")["Worker"])(__dirname + "/node/node.js"):import("worker_threads").then(function(worker){ return new worker["Worker"]((1,eval)("import.meta.dirname") + "/node/node.mjs"); }):a?new window.Worker(URL.createObjectURL(new Blob(["onmessage="+ob.toString()],{type:"text/javascript"}))):new window.Worker(M(c)?c:(0,eval)("import.meta.url").replace("/worker.js","/worker/worker.js"),{type:"module"})}
-;Z.prototype.add=function(a,b,c){N(a)&&(b=a,a=xa(b,this.key));if(b&&(a||0===a)){if(!c&&this.reg.has(a))return this.update(a,b);for(var d=0,e;d<this.field.length;d++){e=this.M[d];var h=this.index.get(this.field[d]);if("function"===typeof e)(e=e(b))&&h.add(a,e,!1,!0);else{var f=e.R;if(!f||f(b))e.constructor===String?e=[""+e]:M(e)&&(e=[e]),tb(b,e,this.T,0,h,a,e[0],c)}}if(this.tag)for(d=0;d<this.L.length;d++){f=this.L[d];h=this.tag.get(this.$[d]);e=L();if("function"===typeof f){if(f=f(b),!f)continue}else{var g=
+function rb(a,b,c){return b?"undefined"!==typeof module?new (require("worker_threads")["Worker"])(__dirname + "/node/node.js"):import("worker_threads").then(function(worker){ return new worker["Worker"]((1,eval)("import.meta.dirname") + "/node/node.mjs"); }):a?new window.Worker(URL.createObjectURL(new Blob(["onmessage="+ob.toString()],{type:"text/javascript"}))):new window.Worker(M(c)?c:(0,eval)("import.meta.url").replace("/worker.js","/worker/worker.js").replace("flexsearch.bundle.module.min.js",
+"module/worker/worker.js"),{type:"module"})};Z.prototype.add=function(a,b,c){N(a)&&(b=a,a=xa(b,this.key));if(b&&(a||0===a)){if(!c&&this.reg.has(a))return this.update(a,b);for(var d=0,e;d<this.field.length;d++){e=this.M[d];var h=this.index.get(this.field[d]);if("function"===typeof e)(e=e(b))&&h.add(a,e,!1,!0);else{var f=e.R;if(!f||f(b))e.constructor===String?e=[""+e]:M(e)&&(e=[e]),tb(b,e,this.T,0,h,a,e[0],c)}}if(this.tag)for(d=0;d<this.L.length;d++){f=this.L[d];h=this.tag.get(this.$[d]);e=L();if("function"===typeof f){if(f=f(b),!f)continue}else{var g=
 f.R;if(g&&!g(b))continue;f.constructor===String&&(f=""+f);f=xa(b,f)}if(h&&f){M(f)&&(f=[f]);g=0;for(var k,l=void 0;g<f.length;g++)if(k=f[g],!e[k]){e[k]=1;var m;(m=h.get(k))?l=m:h.set(k,l=[]);if(!c||!l.includes(a)){if(l.length===Math.pow(2,31)-1){m=new S(l);if(this.fastupdate)for(var n=x(this.reg.values()),p=n.next();!p.done;p=n.next())p=p.value,p.includes(l)&&(p[p.indexOf(l)]=m);h.set(k,l=m)}l.push(a);this.fastupdate&&((k=this.reg.get(a))?k.push(l):this.reg.set(a,[l]))}}}}if(this.store&&(!c||!this.store.has(a))){if(this.H){var q=
 L();for(c=0;c<this.H.length;c++)if(d=this.H[c],h=d.R,!h||h(b)){h=void 0;if("function"===typeof d){h=d(b);if(!h)continue;d=[d.la]}else if(M(d)||d.constructor===String){q[d]=b[d];continue}ub(b,q,d,0,d[0],h)}}this.store.set(a,q||b)}}return this};function ub(a,b,c,d,e,h){a=a[e];if(d===c.length-1)b[e]=h||a;else if(a)if(a.constructor===Array)for(b=b[e]=Array(a.length),e=0;e<a.length;e++)ub(a,b,c,d,e);else b=b[e]||(b[e]=L()),e=c[++d],ub(a,b,c,d,e)}
 function tb(a,b,c,d,e,h,f,g){if(a=a[f])if(d===b.length-1){if(a.constructor===Array){if(c[d]){for(b=0;b<a.length;b++)e.add(h,a[b],!0,!0);return}a=a.join(" ")}e.add(h,a,g,!0)}else if(a.constructor===Array)for(f=0;f<a.length;f++)tb(a,b,c,d,e,h,f,g);else f=b[++d],tb(a,b,c,d,e,h,f,g);else e.db&&e.remove(h)};Z.prototype.search=function(a,b,c,d){c||(!b&&N(a)?(c=a,a=""):N(b)&&(c=b,b=0));var e=[],h=[],f=0;if(c){c.constructor===Array&&(c={index:c});a=c.query||a;var g=c.pluck;var k=c.merge;var l=g||c.field||c.index;var m=this.tag&&c.tag;var n=this.store&&c.enrich;var p=c.suggest;b=c.limit||b;var q=c.offset||0;b||(b=100);if(m&&(!this.db||!d)){m.constructor!==Array&&(m=[m]);for(var r=[],y=0,v=void 0;y<m.length;y++)if(v=m[y],v.field&&v.tag){var t=v.tag;if(t.constructor===Array)for(var w=0;w<t.length;w++)r.push(v.field,
diff --git a/dist/module-debug/worker.js b/dist/module-debug/worker.js
index 3a9d658..601abc1 100644
--- a/dist/module-debug/worker.js
+++ b/dist/module-debug/worker.js
@@ -79,8 +79,7 @@ export default function WorkerIndex(options = {}) {
     }
 
     const worker = create(factory, is_node_js, options.worker);
-    worker.worker = /* tag? */ /* stringify */ /* stringify */ /* skip update: */ /* append: */ /* skip update: */ /* skip_update: */ /* skip deletion */ // splice:
-    !0 /*await rows.hasNext()*/ /*await rows.hasNext()*/ /*await rows.hasNext()*/;
+    //worker.worker = true;
     return worker.then ? worker.then(function (worker) {
         return init.call(_self, worker);
     }) : init.call(this, worker);
@@ -139,7 +138,7 @@ function create(factory, is_node_js, worker_path) {
     //: import("worker_threads").then(function(worker){ return new worker["Worker"](import.meta.dirname + "/worker/node.mjs"); })
 
     //eval('new (require("worker_threads")["Worker"])(__dirname + "/node/node.js")')
-    : factory ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + handler.toString()], { type: "text/javascript" }))) : new window.Worker(is_string(worker_path) ? worker_path : import.meta.url.replace("/worker.js", "/worker/worker.js") /*"worker/worker.js"*/, { type: "module" });
+    : factory ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + handler.toString()], { type: "text/javascript" }))) : new window.Worker(is_string(worker_path) ? worker_path : import.meta.url.replace("/worker.js", "/worker/worker.js").replace("flexsearch.bundle.module.min.js", "module/worker/worker.js") /*"worker/worker.js"*/, { type: "module" });
 
     return worker;
 }
\ No newline at end of file
diff --git a/dist/module-min/worker.js b/dist/module-min/worker.js
index f912bcb..969b6bf 100644
--- a/dist/module-min/worker.js
+++ b/dist/module-min/worker.js
@@ -1 +1 @@
-import{IndexOptions}from"./type.js";import{create_object,is_function,is_object,is_string}from"./common.js";import handler from"./worker/handler.js";let pid=0;export default function WorkerIndex(a={}){function b(b){function f(a){a=a.data||a;const b=a.id,c=b&&e.resolver[b];c&&(c(a.msg),delete e.resolver[b])}if(this.worker=b,this.resolver=create_object(),!!this.worker)return(d?this.worker.on("message",f):this.worker.onmessage=f,a.config)?new Promise(function(b){e.resolver[++pid]=function(){b(e)},e.worker.postMessage({id:pid,task:"init",factory:c,options:a})}):(this.worker.postMessage({task:"init",factory:c,options:a}),this)}if(!this)return new WorkerIndex(a);let c="undefined"==typeof self?"undefined"==typeof window?null:window._factory:self._factory;c&&(c=c.toString());const d="undefined"==typeof window,e=this,f=create(c,d,a.worker);return f.worker=!0,f.then?f.then(function(a){return b.call(e,a)}):b.call(this,f)}register("add"),register("append"),register("search"),register("update"),register("remove");function register(a){WorkerIndex.prototype[a]=WorkerIndex.prototype[a+"Async"]=async function(){const b=this,c=[].slice.call(arguments),d=c[c.length-1];let e;is_function(d)&&(e=d,c.splice(c.length-1,1));const f=new Promise(function(d){b.resolver[++pid]=d,b.worker.postMessage({task:a,id:pid,args:c})});return e?(f.then(e),this):f}}function create(a,b,c){let d;return d=b?"undefined"==typeof module?(0,eval)("import(\"worker_threads\").then(function(worker){ return new worker[\"Worker\"]((1,eval)(\"import.meta.dirname\") + \"/node/node.mjs\"); })"):(0,eval)("new (require(\"worker_threads\")[\"Worker\"])(__dirname + \"/node/node.js\")"):a?new window.Worker(URL.createObjectURL(new Blob(["onmessage="+handler.toString()],{type:"text/javascript"}))):new window.Worker(is_string(c)?c:(1,eval)("import.meta.url").replace("/worker.js","/worker/worker.js"),{type:"module"}),d}
\ No newline at end of file
+import{IndexOptions}from"./type.js";import{create_object,is_function,is_object,is_string}from"./common.js";import handler from"./worker/handler.js";let pid=0;export default function WorkerIndex(a={}){function b(b){function f(a){a=a.data||a;const b=a.id,c=b&&e.resolver[b];c&&(c(a.msg),delete e.resolver[b])}if(this.worker=b,this.resolver=create_object(),!!this.worker)return(d?this.worker.on("message",f):this.worker.onmessage=f,a.config)?new Promise(function(b){e.resolver[++pid]=function(){b(e)},e.worker.postMessage({id:pid,task:"init",factory:c,options:a})}):(this.worker.postMessage({task:"init",factory:c,options:a}),this)}if(!this)return new WorkerIndex(a);let c="undefined"==typeof self?"undefined"==typeof window?null:window._factory:self._factory;c&&(c=c.toString());const d="undefined"==typeof window,e=this,f=create(c,d,a.worker);return f.then?f.then(function(a){return b.call(e,a)}):b.call(this,f)}register("add"),register("append"),register("search"),register("update"),register("remove");function register(a){WorkerIndex.prototype[a]=WorkerIndex.prototype[a+"Async"]=async function(){const b=this,c=[].slice.call(arguments),d=c[c.length-1];let e;is_function(d)&&(e=d,c.splice(c.length-1,1));const f=new Promise(function(d){b.resolver[++pid]=d,b.worker.postMessage({task:a,id:pid,args:c})});return e?(f.then(e),this):f}}function create(a,b,c){let d;return d=b?"undefined"==typeof module?(0,eval)("import(\"worker_threads\").then(function(worker){ return new worker[\"Worker\"]((1,eval)(\"import.meta.dirname\") + \"/node/node.mjs\"); })"):(0,eval)("new (require(\"worker_threads\")[\"Worker\"])(__dirname + \"/node/node.js\")"):a?new window.Worker(URL.createObjectURL(new Blob(["onmessage="+handler.toString()],{type:"text/javascript"}))):new window.Worker(is_string(c)?c:(1,eval)("import.meta.url").replace("/worker.js","/worker/worker.js").replace("flexsearch.bundle.module.min.js","module/worker/worker.js"),{type:"module"}),d}
\ No newline at end of file
diff --git a/dist/module/worker.js b/dist/module/worker.js
index 3a9d658..601abc1 100644
--- a/dist/module/worker.js
+++ b/dist/module/worker.js
@@ -79,8 +79,7 @@ export default function WorkerIndex(options = {}) {
     }
 
     const worker = create(factory, is_node_js, options.worker);
-    worker.worker = /* tag? */ /* stringify */ /* stringify */ /* skip update: */ /* append: */ /* skip update: */ /* skip_update: */ /* skip deletion */ // splice:
-    !0 /*await rows.hasNext()*/ /*await rows.hasNext()*/ /*await rows.hasNext()*/;
+    //worker.worker = true;
     return worker.then ? worker.then(function (worker) {
         return init.call(_self, worker);
     }) : init.call(this, worker);
@@ -139,7 +138,7 @@ function create(factory, is_node_js, worker_path) {
     //: import("worker_threads").then(function(worker){ return new worker["Worker"](import.meta.dirname + "/worker/node.mjs"); })
 
     //eval('new (require("worker_threads")["Worker"])(__dirname + "/node/node.js")')
-    : factory ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + handler.toString()], { type: "text/javascript" }))) : new window.Worker(is_string(worker_path) ? worker_path : import.meta.url.replace("/worker.js", "/worker/worker.js") /*"worker/worker.js"*/, { type: "module" });
+    : factory ? new window.Worker(URL.createObjectURL(new Blob(["onmessage=" + handler.toString()], { type: "text/javascript" }))) : new window.Worker(is_string(worker_path) ? worker_path : import.meta.url.replace("/worker.js", "/worker/worker.js").replace("flexsearch.bundle.module.min.js", "module/worker/worker.js") /*"worker/worker.js"*/, { type: "module" });
 
     return worker;
 }
\ No newline at end of file
diff --git a/example/browser-legacy/basic-persistent/index.html b/example/browser-legacy/basic-persistent/index.html
new file mode 100644
index 0000000..43aa8be
--- /dev/null
+++ b/example/browser-legacy/basic-persistent/index.html
@@ -0,0 +1,64 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, height=device-height">
+  <title>Example: browser-basic-persistent</title>
+</head>
+<body style="white-space: pre">
+<script src="https://rawcdn.githack.com/nextapps-de/flexsearch/v0.8-preview/dist/flexsearch.bundle.min.js"></script>
+<script>
+(async function(){
+
+  // create DB instance with namespace
+  const db = new FlexSearch.IndexedDB("my-store");
+
+  // create a simple index which can store id-content-pairs
+  const index = new FlexSearch.Index({
+    tokenize: "forward"
+  });
+
+  // mount database to the index
+  await index.mount(db);
+  // await document.destroy();
+  // await document.mount(db);
+
+  // some test data
+  const data = [
+    'cats abcd efgh ijkl mnop qrst uvwx cute',
+    'cats abcd efgh ijkl mnop qrst cute',
+    'cats abcd efgh ijkl mnop cute',
+    'cats abcd efgh ijkl cute',
+    'cats abcd efgh cute',
+    'cats abcd cute',
+    'cute cat '
+  ];
+
+  data.forEach((item, id) => {
+    index.add(id, item);
+  });
+
+  // transfer changes (bulk)
+  await index.commit();
+
+  // perform query
+  const result = await index.search({
+    query: "cute cat",
+    suggest: true
+  });
+
+  // display results
+  result.forEach(i => {
+    console.log(data[i]);
+    log(data[i]);
+  });
+
+  function log(str){
+    document.body.appendChild(
+      document.createTextNode(str + "\n")
+    );
+  }
+}());
+</script>
+</body>
+</html>
\ No newline at end of file
diff --git a/example/browser-legacy/basic-suggestion/index.html b/example/browser-legacy/basic-suggestion/index.html
new file mode 100644
index 0000000..81fe991
--- /dev/null
+++ b/example/browser-legacy/basic-suggestion/index.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, height=device-height">
+  <title>Example: browser-basic-suggestion</title>
+</head>
+<body style="white-space: pre">
+<script src="https://rawcdn.githack.com/nextapps-de/flexsearch/v0.8-preview/dist/flexsearch.light.min.js"></script>
+<script>
+
+  // create a simple index which can store id-content-pairs
+  const index = new FlexSearch.Index({
+    tokenize: "forward"
+  });
+
+  // some test data
+  const data = [
+    'cats abcd efgh ijkl mnop qrst uvwx cute',
+    'cats abcd efgh ijkl mnop qrst cute',
+    'cats abcd efgh ijkl mnop cute',
+    'cats abcd efgh ijkl cute',
+    'cats abcd efgh cute',
+    'cats abcd cute',
+    'cats cute'
+  ];
+
+  // add data to the index
+  data.forEach((item, id) => {
+    index.add(id, item);
+  });
+
+  // perform query
+  const result = index.search({
+    query: "black or cute or yellow cat",
+    suggest: true
+  });
+
+  // display results
+  result.forEach(i => {
+    console.log(data[i]);
+    log(data[i]);
+  });
+
+  function log(str){
+    document.body.appendChild(
+      document.createTextNode(str + "\n")
+    );
+  }
+</script>
+</body>
+</html>
\ No newline at end of file
diff --git a/example/browser-legacy/basic-worker/index.html b/example/browser-legacy/basic-worker/index.html
new file mode 100644
index 0000000..188e677
--- /dev/null
+++ b/example/browser-legacy/basic-worker/index.html
@@ -0,0 +1,53 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, height=device-height">
+  <title>Example: browser-basic-worker</title>
+</head>
+<body style="white-space: pre">
+<script src="https://rawcdn.githack.com/nextapps-de/flexsearch/v0.8-preview/dist/flexsearch.bundle.min.js"></script>
+<script>
+(async function(){
+
+  // create a simple index which can store id-content-pairs
+  const index = new FlexSearch.Worker({
+    tokenize: "forward"
+  });
+
+  // some test data
+  const data = [
+    'cats abcd efgh ijkl mnop qrst uvwx cute',
+    'cats abcd efgh ijkl mnop qrst cute',
+    'cats abcd efgh ijkl mnop cute',
+    'cats abcd efgh ijkl cute',
+    'cats abcd efgh cute',
+    'cats abcd cute',
+    'cats cute'
+  ];
+
+  for(let i = 0; i < data.length; i++){
+    await index.add(i, data[i]);
+  }
+
+  // perform query
+  const result = await index.search({
+    query: "cute cat",
+    suggest: true
+  });
+
+  // display results
+  result.forEach(i => {
+    console.log(data[i]);
+    log(data[i]);
+  });
+
+  function log(str){
+    document.body.appendChild(
+      document.createTextNode(str + "\n")
+    );
+  }
+}());
+</script>
+</body>
+</html>
\ No newline at end of file
diff --git a/example/browser-legacy/basic/index.html b/example/browser-legacy/basic/index.html
new file mode 100644
index 0000000..8b7a0aa
--- /dev/null
+++ b/example/browser-legacy/basic/index.html
@@ -0,0 +1,49 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, height=device-height">
+  <title>Example: browser-basic</title>
+</head>
+<body style="white-space: pre">
+<script src="https://rawcdn.githack.com/nextapps-de/flexsearch/v0.8-preview/dist/flexsearch.light.min.js"></script>
+<script>
+
+  // create a simple index which can store id-content-pairs
+  const index = new FlexSearch.Index({
+    tokenize: "forward"
+  });
+
+  // some test data
+  const data = [
+    'cats abcd efgh ijkl mnop qrst uvwx cute',
+    'cats abcd efgh ijkl mnop qrst cute',
+    'cats abcd efgh ijkl mnop cute',
+    'cats abcd efgh ijkl cute',
+    'cats abcd efgh cute',
+    'cats abcd cute',
+    'cats cute'
+  ];
+
+  // add data to the index
+  data.forEach((item, id) => {
+    index.add(id, item);
+  });
+
+  // perform query
+  const result = index.search("cute cat");
+
+  // display results
+  result.forEach(i => {
+    console.log(data[i]);
+    log(data[i]);
+  });
+
+  function log(str){
+    document.body.appendChild(
+      document.createTextNode(str + "\n")
+    );
+  }
+</script>
+</body>
+</html>
\ No newline at end of file
diff --git a/example/browser-legacy/document-persistent/index.html b/example/browser-legacy/document-persistent/index.html
new file mode 100644
index 0000000..e0b7ec5
--- /dev/null
+++ b/example/browser-legacy/document-persistent/index.html
@@ -0,0 +1,143 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, height=device-height">
+  <title>Example: browser-document-persistent</title>
+</head>
+<body style="white-space: pre">
+<script src="https://rawcdn.githack.com/nextapps-de/flexsearch/v0.8-preview/dist/flexsearch.bundle.min.js"></script>
+<script>
+(async function(){
+
+  // some test data
+  const data = [{
+    "tconst": "tt0000001",
+    "titleType": "short",
+    "primaryTitle": "Carmencita",
+    "originalTitle": "Carmencita",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Documentary",
+      "Short"
+    ]
+  },{
+    "tconst": "tt0000002",
+    "titleType": "short",
+    "primaryTitle": "Le clown et ses chiens",
+    "originalTitle": "Le clown et ses chiens",
+    "isAdult": 0,
+    "startYear": "1892",
+    "endYear": "",
+    "runtimeMinutes": "5",
+    "genres": [
+      "Animation",
+      "Short"
+    ]
+  }];
+
+  // create DB instance with namespace
+  const db = new FlexSearch.IndexedDB("my-store");
+
+  // create the document index
+  const index = new FlexSearch.Document({
+    // hint: the encoder is shared for both index fields
+    // because primaryTitle and originalTitle has almost
+    // equal content, otherwise you should set the encoder
+    // option to each of the field options separately
+    encoder: FlexSearch.Charset.LatinBalance,
+    document: {
+      id: "tconst",
+      store: true,
+      index: [{
+        field: "primaryTitle",
+        tokenize: "forward"
+      },{
+        field: "originalTitle",
+        tokenize: "forward"
+      }],
+      tag: [{
+        field: "startYear"
+      },{
+        field: "genres"
+      }]
+    }
+  });
+
+  await index.mount(db);
+  // await document.destroy();
+  // await document.mount(db);
+
+  // add test data
+  for(let i = 0; i < data.length; i++){
+    index.add(data[i]);
+  }
+
+  // transfer changes (bulk)
+  await index.commit();
+
+  // perform a query
+  const result = await index.search({
+    query: "karmen",
+    tag: {
+      "startYear": "1894",
+      "genres": [
+        "Documentary",
+        "Short"
+      ]
+    },
+    enrich: true
+  });
+
+  // display results
+  console.log(result);
+  log(JSON.stringify(result, null, 2));
+  log("\n-------------------------------------\n");
+
+  // perform a query + merge results
+  const merged = await index.search({
+    query: "karmen",
+    tag: {
+      "startYear": "1894",
+      "genres": [
+        "Documentary",
+        "Short"
+      ]
+    },
+    enrich: true,
+    merge: true
+  });
+
+  // display results
+  console.log(merged);
+  log(JSON.stringify(merged, null, 2));
+  log("\n-------------------------------------\n");
+
+  // perform a query + get suggestions
+  const suggestions = await index.search({
+    query: "karmen or clown or not found",
+    tag: {
+      // no data for this category:
+      "genres": "Movie"
+    },
+    suggest: true,
+    enrich: true,
+    merge: true
+  });
+
+  // display results
+  console.log(suggestions);
+  log(JSON.stringify(suggestions, null, 2));
+
+  function log(str){
+    document.body.appendChild(
+      document.createTextNode(str + "\n")
+    );
+  }
+}());
+</script>
+</body>
+</html>
\ No newline at end of file
diff --git a/example/browser-legacy/document-worker/index.html b/example/browser-legacy/document-worker/index.html
new file mode 100644
index 0000000..5952791
--- /dev/null
+++ b/example/browser-legacy/document-worker/index.html
@@ -0,0 +1,135 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, height=device-height">
+  <title>Example: browser-document-worker</title>
+</head>
+<body style="white-space: pre">
+<script src="https://rawcdn.githack.com/nextapps-de/flexsearch/v0.8-preview/dist/flexsearch.bundle.min.js"></script>
+<script>
+(async function(){
+
+  // some test data
+  const data = [{
+    "tconst": "tt0000001",
+    "titleType": "short",
+    "primaryTitle": "Carmencita",
+    "originalTitle": "Carmencita",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Documentary",
+      "Short"
+    ]
+  },{
+    "tconst": "tt0000002",
+    "titleType": "short",
+    "primaryTitle": "Le clown et ses chiens",
+    "originalTitle": "Le clown et ses chiens",
+    "isAdult": 0,
+    "startYear": "1892",
+    "endYear": "",
+    "runtimeMinutes": "5",
+    "genres": [
+      "Animation",
+      "Short"
+    ]
+  }];
+
+  // create the document index
+  const index = new FlexSearch.Document({
+    // enable worker:
+    worker: true,
+    // hint: the encoder is shared for both index fields
+    // because primaryTitle and originalTitle has almost
+    // equal content, otherwise you should set the encoder
+    // option to each of the field options separately
+    encoder: FlexSearch.Charset.LatinBalance,
+    document: {
+      id: "tconst",
+      store: true,
+      index: [{
+        field: "primaryTitle",
+        tokenize: "forward"
+      },{
+        field: "originalTitle",
+        tokenize: "forward"
+      }],
+      tag: [{
+        field: "startYear"
+      },{
+        field: "genres"
+      }]
+    }
+  });
+
+  // add test data
+  for(let i = 0; i < data.length; i++){
+    await index.add(data[i]);
+  }
+
+  // perform a query
+  const result = await index.search({
+    query: "karmen",
+    tag: {
+      "startYear": "1894",
+      "genres": [
+        "Documentary",
+        "Short"
+      ]
+    },
+    enrich: true
+  });
+
+  // display results
+  console.log(result);
+  log(JSON.stringify(result, null, 2));
+  log("\n-------------------------------------\n");
+
+  // perform a query + merge results
+  const merged = await index.search({
+    query: "karmen",
+    tag: {
+      "startYear": "1894",
+      "genres": [
+        "Documentary",
+        "Short"
+      ]
+    },
+    enrich: true,
+    merge: true
+  });
+
+  // display results
+  console.log(merged);
+  log(JSON.stringify(merged, null, 2));
+  log("\n-------------------------------------\n");
+
+  // perform a query + get suggestions
+  const suggestions = await index.search({
+    query: "karmen or clown or not found",
+    tag: {
+      // no data for this category:
+      "genres": "Movie"
+    },
+    suggest: true,
+    enrich: true,
+    merge: true
+  });
+
+  // display results
+  console.log(suggestions);
+  log(JSON.stringify(suggestions, null, 2));
+
+  function log(str){
+    document.body.appendChild(
+      document.createTextNode(str + "\n")
+    );
+  }
+}());
+</script>
+</body>
+</html>
\ No newline at end of file
diff --git a/example/browser-legacy/document/index.html b/example/browser-legacy/document/index.html
new file mode 100644
index 0000000..e709016
--- /dev/null
+++ b/example/browser-legacy/document/index.html
@@ -0,0 +1,131 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, height=device-height">
+  <title>Example: browser-document</title>
+</head>
+<body style="white-space: pre">
+<script src="https://rawcdn.githack.com/nextapps-de/flexsearch/v0.8-preview/dist/flexsearch.compact.min.js"></script>
+<script>
+
+  // some test data
+  const data = [{
+    "tconst": "tt0000001",
+    "titleType": "short",
+    "primaryTitle": "Carmencita",
+    "originalTitle": "Carmencita",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Documentary",
+      "Short"
+    ]
+  },{
+    "tconst": "tt0000002",
+    "titleType": "short",
+    "primaryTitle": "Le clown et ses chiens",
+    "originalTitle": "Le clown et ses chiens",
+    "isAdult": 0,
+    "startYear": "1892",
+    "endYear": "",
+    "runtimeMinutes": "5",
+    "genres": [
+      "Animation",
+      "Short"
+    ]
+  }];
+
+  // create the document index
+  const index = new FlexSearch.Document({
+    // hint: the encoder is shared for both index fields
+    // because primaryTitle and originalTitle has almost
+    // equal content, otherwise you should set the encoder
+    // option to each of the field options separately
+    encoder: FlexSearch.Charset.LatinBalance,
+    document: {
+      id: "tconst",
+      store: true,
+      index: [{
+        field: "primaryTitle",
+        tokenize: "forward"
+      },{
+        field: "originalTitle",
+        tokenize: "forward"
+      }],
+      tag: [{
+        field: "startYear"
+      },{
+        field: "genres"
+      }]
+    }
+  });
+
+  // add test data
+  for(let i = 0; i < data.length; i++){
+    index.add(data[i]);
+  }
+
+  // perform a query
+  const result = index.search({
+    query: "karmen",
+    tag: {
+      "startYear": "1894",
+      "genres": [
+        "Documentary",
+        "Short"
+      ]
+    },
+    enrich: true
+  });
+
+  // display results
+  console.log(result);
+  log(JSON.stringify(result, null, 2));
+  log("\n-------------------------------------\n");
+
+  // perform a query + merge results
+  const merged = index.search({
+    query: "karmen",
+    tag: {
+      "startYear": "1894",
+      "genres": [
+        "Documentary",
+        "Short"
+      ]
+    },
+    enrich: true,
+    merge: true
+  });
+
+  // display results
+  console.log(merged);
+  log(JSON.stringify(merged, null, 2));
+  log("\n---------------------------------------\n");
+
+  // perform a query + get suggestions
+  const suggestions = index.search({
+    query: "karmen or clown or not found",
+    tag: {
+      // no data for this category:
+      "genres": "Movie"
+    },
+    suggest: true,
+    enrich: true,
+    merge: true
+  });
+
+  // display results
+  console.log(suggestions);
+  log(JSON.stringify(suggestions, null, 2));
+
+  function log(str){
+    document.body.appendChild(
+      document.createTextNode(str + "\n")
+    );
+  }
+</script>
+</body>
+</html>
\ No newline at end of file
diff --git a/example/browser-module/basic-persistent/index.html b/example/browser-module/basic-persistent/index.html
new file mode 100644
index 0000000..e0b4d95
--- /dev/null
+++ b/example/browser-module/basic-persistent/index.html
@@ -0,0 +1,62 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, height=device-height">
+  <title>Example: browser-basic-persistent</title>
+</head>
+<body style="white-space: pre">
+<script type="module">
+
+  import { Index, IndexedDB } from "https://rawcdn.githack.com/nextapps-de/flexsearch/v0.8-preview/dist/flexsearch.bundle.module.min.js";
+
+  // create DB instance with namespace
+  const db = new IndexedDB("my-store");
+
+  // create a simple index which can store id-content-pairs
+  const index = new Index({
+    tokenize: "forward"
+  });
+
+  // mount database to the index
+  await index.mount(db);
+  // await index.destroy();
+  // await index.mount(db);
+
+  // some test data
+  const data = [
+    'cats abcd efgh ijkl mnop qrst uvwx cute',
+    'cats abcd efgh ijkl mnop qrst cute',
+    'cats abcd efgh ijkl mnop cute',
+    'cats abcd efgh ijkl cute',
+    'cats abcd efgh cute',
+    'cats abcd cute',
+    'cats cute'
+  ];
+
+  data.forEach((item, id) => {
+    index.add(id, item);
+  });
+
+  // transfer changes (bulk)
+  await index.commit();
+
+  const result = await index.search({
+    query: "cute cat",
+    suggest: true
+  });
+
+  console.log(result);
+
+  result.forEach(i => {
+    log(data[i]);
+  });
+
+  function log(str){
+    document.body.appendChild(
+      document.createTextNode(str + "\n")
+    );
+  }
+</script>
+</body>
+</html>
\ No newline at end of file
diff --git a/example/browser-module/basic-suggestion/index.html b/example/browser-module/basic-suggestion/index.html
new file mode 100644
index 0000000..4bcbe03
--- /dev/null
+++ b/example/browser-module/basic-suggestion/index.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, height=device-height">
+  <title>Example: browser-basic-suggestion</title>
+</head>
+<body style="white-space: pre">
+<script type="module">
+
+  import { Index } from "https://rawcdn.githack.com/nextapps-de/flexsearch/v0.8-preview/dist/flexsearch.light.module.min.js";
+
+  // create a simple index which can store id-content-pairs
+  const index = new Index({
+    tokenize: "forward"
+  });
+
+  // some test data
+  const data = [
+    'cats abcd efgh ijkl mnop qrst uvwx cute',
+    'cats abcd efgh ijkl mnop qrst cute',
+    'cats abcd efgh ijkl mnop cute',
+    'cats abcd efgh ijkl cute',
+    'cats abcd efgh cute',
+    'cats abcd cute',
+    'cats cute'
+  ];
+
+  data.forEach((item, id) => {
+    index.add(id, item);
+  });
+
+  // perform query
+  const result = index.search({
+    query: "black or cute or yellow cat",
+    suggest: true
+  });
+
+  // display results
+  result.forEach(i => {
+    console.log(data[i]);
+    log(data[i]);
+  });
+
+  function log(str){
+    document.body.appendChild(
+      document.createTextNode(str + "\n")
+    );
+  }
+</script>
+</body>
+</html>
\ No newline at end of file
diff --git a/example/browser-module/basic-worker-extern-config/index.html b/example/browser-module/basic-worker-extern-config/index.html
new file mode 100644
index 0000000..c8d6b09
--- /dev/null
+++ b/example/browser-module/basic-worker-extern-config/index.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, height=device-height">
+  <title>Example: browser-basic-worker-extern-config</title>
+</head>
+<body style="white-space: pre">
+<script type="module">
+
+  import { Index } from "https://rawcdn.githack.com/nextapps-de/flexsearch/v0.8-preview/dist/flexsearch.bundle.module.min.js";
+
+  // create a simple index which can store id-content-pairs
+  const index = new Index({
+    tokenize: "forward"
+  });
+
+  // some test data
+  const data = [
+    'cats abcd efgh ijkl mnop qrst uvwx cute',
+    'cats abcd efgh ijkl mnop qrst cute',
+    'cats abcd efgh ijkl mnop cute',
+    'cats abcd efgh ijkl cute',
+    'cats abcd efgh cute',
+    'cats abcd cute',
+    'cats cute'
+  ];
+
+  data.forEach((item, id) => {
+    index.add(id, item);
+  });
+
+  // perform query
+  const result = await index.search({
+    query: "cute cat",
+    suggest: true
+  });
+
+  // display results
+  result.forEach(i => {
+    console.log(data[i]);
+    log(data[i]);
+  });
+
+  function log(str){
+    document.body.appendChild(
+      document.createTextNode(str + "\n")
+    );
+  }
+</script>
+</body>
+</html>
\ No newline at end of file
diff --git a/example/browser-module/basic-worker/index.html b/example/browser-module/basic-worker/index.html
new file mode 100644
index 0000000..f9d7373
--- /dev/null
+++ b/example/browser-module/basic-worker/index.html
@@ -0,0 +1,52 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, height=device-height">
+  <title>Example: browser-basic-worker</title>
+</head>
+<body style="white-space: pre">
+<script type="module">
+
+  import { Worker as WorkerIndex } from "https://rawcdn.githack.com/nextapps-de/flexsearch/v0.8-preview/dist/flexsearch.bundle.module.min.js";
+
+  // create a simple index which can store id-content-pairs
+  const index = new WorkerIndex({
+    tokenize: "forward"
+  });
+
+  // some test data
+  const data = [
+    'cats abcd efgh ijkl mnop qrst uvwx cute',
+    'cats abcd efgh ijkl mnop qrst cute',
+    'cats abcd efgh ijkl mnop cute',
+    'cats abcd efgh ijkl cute',
+    'cats abcd efgh cute',
+    'cats abcd cute',
+    'cats cute'
+  ];
+
+  data.forEach((item, id) => {
+    index.add(id, item);
+  });
+
+  // perform query
+  const result = await index.search({
+    query: "cute cat",
+    suggest: true
+  });
+
+  // display results
+  result.forEach(i => {
+    console.log(data[i]);
+    log(data[i]);
+  });
+
+  function log(str){
+    document.body.appendChild(
+      document.createTextNode(str + "\n")
+    );
+  }
+</script>
+</body>
+</html>
\ No newline at end of file
diff --git a/example/browser-module/basic/index.html b/example/browser-module/basic/index.html
new file mode 100644
index 0000000..b3cf0dd
--- /dev/null
+++ b/example/browser-module/basic/index.html
@@ -0,0 +1,55 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, height=device-height">
+  <title>Example: browser-basic</title>
+</head>
+<body style="white-space: pre">
+<script type="module">
+
+  import { Index } from "https://rawcdn.githack.com/nextapps-de/flexsearch/v0.8-preview/dist/flexsearch.light.module.min.js";
+
+  // create a simple index which can store id-content-pairs
+  const index = new Index({
+    tokenize: "forward"
+  });
+
+  // some test data
+  const data = [
+    'cats abcd efgh ijkl mnop qrst uvwx cute',
+    'cats abcd efgh ijkl mnop qrst cute',
+    'cats abcd efgh ijkl mnop cute',
+    'cats abcd efgh ijkl cute',
+    'cats abcd efgh cute',
+    'cats abcd cute',
+    'cats cute'
+  ];
+
+  data.forEach((item, id) => {
+    index.add(id, item);
+  });
+
+  index.search("cute cats").forEach(i => {
+    const result = data[i];
+    log(result);
+  });
+
+  log("\n----------------------\n");
+
+  index.search({
+    query: "black or cute or yellow cats",
+    suggest: true
+  }).forEach(i => {
+    const result = data[i];
+    log(result);
+  });
+
+  function log(str){
+    document.body.appendChild(
+      document.createTextNode(str + "\n")
+    );
+  }
+</script>
+</body>
+</html>
\ No newline at end of file
diff --git a/example/browser-module/document-persistent/index.html b/example/browser-module/document-persistent/index.html
new file mode 100644
index 0000000..73c38e1
--- /dev/null
+++ b/example/browser-module/document-persistent/index.html
@@ -0,0 +1,140 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, height=device-height">
+  <title>Example: browser-document-persistent</title>
+</head>
+<body style="white-space: pre">
+<script type="module">
+
+  import { Document, Charset, IndexedDB } from "https://rawcdn.githack.com/nextapps-de/flexsearch/v0.8-preview/dist/flexsearch.bundle.module.min.js";
+
+  // some test data
+  const data = [{
+    "tconst": "tt0000001",
+    "titleType": "short",
+    "primaryTitle": "Carmencita",
+    "originalTitle": "Carmencita",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Documentary",
+      "Short"
+    ]
+  },{
+    "tconst": "tt0000002",
+    "titleType": "short",
+    "primaryTitle": "Le clown et ses chiens",
+    "originalTitle": "Le clown et ses chiens",
+    "isAdult": 0,
+    "startYear": "1892",
+    "endYear": "",
+    "runtimeMinutes": "5",
+    "genres": [
+      "Animation",
+      "Short"
+    ]
+  }];
+
+  // create DB instance with namespace
+  const db = new IndexedDB("my-store");
+
+  // create the document index
+  const index = new Document({
+    document: {
+      id: "tconst",
+      store: true,
+      index: [{
+        field: "primaryTitle",
+        tokenize: "forward",
+        encoder: Charset.LatinBalance
+      },{
+        field: "originalTitle",
+        tokenize: "forward",
+        encoder: Charset.LatinBalance
+      }],
+      tag: [{
+        field: "startYear"
+      },{
+        field: "genres"
+      }]
+    }
+  });
+
+  await index.mount(db);
+  // await document.destroy();
+  // await document.mount(db);
+
+  // add test data
+  for(let i = 0; i < data.length; i++){
+    index.add(data[i]);
+  }
+
+  // transfer changes (bulk)
+  await index.commit();
+
+  // perform a query
+  const result = await index.search({
+    query: "karmen",
+    tag: {
+      "startYear": "1894",
+      "genres": [
+        "Documentary",
+        "Short"
+      ]
+    },
+    enrich: true
+  });
+
+  // display results
+  console.log(result);
+  log(JSON.stringify(result, null, 2));
+  log("\n-------------------------------------\n");
+
+  // perform a query + merge results
+  const merged = await index.search({
+    query: "karmen",
+    tag: {
+      "startYear": "1894",
+      "genres": [
+        "Documentary",
+        "Short"
+      ]
+    },
+    enrich: true,
+    merge: true
+  });
+
+  // display results
+  console.log(merged);
+  log(JSON.stringify(merged, null, 2));
+  log("\n-------------------------------------\n");
+
+  // perform a query + get suggestions
+  const suggestions = await index.search({
+    query: "karmen or clown or not found",
+    tag: {
+      // no data for this category:
+      "genres": "Movie"
+    },
+    suggest: true,
+    enrich: true,
+    merge: true
+  });
+
+  // display results
+  console.log(suggestions);
+  log(JSON.stringify(suggestions, null, 2));
+
+  function log(str){
+    document.body.appendChild(
+      document.createTextNode(str + "\n")
+    );
+  }
+
+</script>
+</body>
+</html>
\ No newline at end of file
diff --git a/example/browser-module/document-worker-extern-config/config.originalTitle.js b/example/browser-module/document-worker-extern-config/config.originalTitle.js
new file mode 100644
index 0000000..872f517
--- /dev/null
+++ b/example/browser-module/document-worker-extern-config/config.originalTitle.js
@@ -0,0 +1,17 @@
+import { Encoder, Charset } from "https://rawcdn.githack.com/nextapps-de/flexsearch/v0.8-preview/dist/flexsearch.bundle.module.min.js";
+import EnglishPreset from "https://rawcdn.githack.com/nextapps-de/flexsearch/v0.8-preview/dist/module/lang/en.js";
+
+export default {
+    tokenize: "forward",
+    encoder: new Encoder(
+        Charset.LatinBalance,
+        EnglishPreset,
+        {
+            normalize: function(str){
+                return str.toLowerCase();
+            },
+            filter: false,
+            minlength: 3
+        }
+    )
+};
\ No newline at end of file
diff --git a/example/browser-module/document-worker-extern-config/config.primaryTitle.js b/example/browser-module/document-worker-extern-config/config.primaryTitle.js
new file mode 100644
index 0000000..872f517
--- /dev/null
+++ b/example/browser-module/document-worker-extern-config/config.primaryTitle.js
@@ -0,0 +1,17 @@
+import { Encoder, Charset } from "https://rawcdn.githack.com/nextapps-de/flexsearch/v0.8-preview/dist/flexsearch.bundle.module.min.js";
+import EnglishPreset from "https://rawcdn.githack.com/nextapps-de/flexsearch/v0.8-preview/dist/module/lang/en.js";
+
+export default {
+    tokenize: "forward",
+    encoder: new Encoder(
+        Charset.LatinBalance,
+        EnglishPreset,
+        {
+            normalize: function(str){
+                return str.toLowerCase();
+            },
+            filter: false,
+            minlength: 3
+        }
+    )
+};
\ No newline at end of file
diff --git a/example/browser-module/document-worker-extern-config/index.html b/example/browser-module/document-worker-extern-config/index.html
new file mode 100644
index 0000000..28a74c4
--- /dev/null
+++ b/example/browser-module/document-worker-extern-config/index.html
@@ -0,0 +1,130 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, height=device-height">
+  <title>Example: browser-document-worker-extern-config</title>
+</head>
+<body style="white-space: pre">
+<script type="module">
+
+  import { Document } from "https://rawcdn.githack.com/nextapps-de/flexsearch/v0.8-preview/dist/flexsearch.bundle.module.min.js";
+  const dirname = import.meta.url.replace("/index.html", "");
+
+  // some test data
+  const data = [{
+    "tconst": "tt0000001",
+    "titleType": "short",
+    "primaryTitle": "Carmencita",
+    "originalTitle": "Carmencita",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Documentary",
+      "Short"
+    ]
+  },{
+    "tconst": "tt0000002",
+    "titleType": "short",
+    "primaryTitle": "Le clown et ses chiens",
+    "originalTitle": "Le clown et ses chiens",
+    "isAdult": 0,
+    "startYear": "1892",
+    "endYear": "",
+    "runtimeMinutes": "5",
+    "genres": [
+      "Animation",
+      "Short"
+    ]
+  }];
+
+  // create the document and await (!) for the instance response
+  const index = await new Document({
+    worker: true,
+    document: {
+      id: "tconst",
+      store: true,
+      index: [{
+        field: "primaryTitle",
+        config: dirname + "/config.primaryTitle.js"
+      },{
+        field: "originalTitle",
+        config: dirname + "/config.originalTitle.js"
+      }],
+      tag: [{
+        field: "startYear"
+      },{
+        field: "genres"
+      }]
+    }
+  });
+
+  // add test data
+  for(let i = 0; i < data.length; i++){
+    await index.add(data[i]);
+  }
+
+  // perform a query
+  const result = await index.search({
+    query: "karmen",
+    tag: {
+      "startYear": "1894",
+      "genres": [
+        "Documentary",
+        "Short"
+      ]
+    },
+    enrich: true
+  });
+
+  // display results
+  console.log(result);
+  log(JSON.stringify(result, null, 2));
+  log("\n-------------------------------------\n");
+
+  // perform a query + merge results
+  const merged = await index.search({
+    query: "karmen",
+    tag: {
+      "startYear": "1894",
+      "genres": [
+        "Documentary",
+        "Short"
+      ]
+    },
+    enrich: true,
+    merge: true
+  });
+
+  // display results
+  console.log(merged);
+  log(JSON.stringify(merged, null, 2));
+  log("\n-------------------------------------\n");
+
+  // perform a query + get suggestions
+  const suggestions = await index.search({
+    query: "karmen or clown or not found",
+    tag: {
+      // no data for this category:
+      "genres": "Movie"
+    },
+    suggest: true,
+    enrich: true,
+    merge: true
+  });
+
+  // display results
+  console.log(suggestions);
+  log(JSON.stringify(suggestions, null, 2));
+
+  function log(str){
+    document.body.appendChild(
+        document.createTextNode(str + "\n")
+    );
+  }
+
+</script>
+</body>
+</html>
\ No newline at end of file
diff --git a/example/browser-module/document-worker/index.html b/example/browser-module/document-worker/index.html
new file mode 100644
index 0000000..520f4e7
--- /dev/null
+++ b/example/browser-module/document-worker/index.html
@@ -0,0 +1,131 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, height=device-height">
+  <title>Example: browser-document-worker</title>
+</head>
+<body style="white-space: pre">
+<script type="module">
+
+  import { Document } from "https://rawcdn.githack.com/nextapps-de/flexsearch/v0.8-preview/dist/flexsearch.bundle.module.min.js";
+
+  // some test data
+  const data = [{
+    "tconst": "tt0000001",
+    "titleType": "short",
+    "primaryTitle": "Carmencita",
+    "originalTitle": "Carmencita",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Documentary",
+      "Short"
+    ]
+  },{
+    "tconst": "tt0000002",
+    "titleType": "short",
+    "primaryTitle": "Le clown et ses chiens",
+    "originalTitle": "Le clown et ses chiens",
+    "isAdult": 0,
+    "startYear": "1892",
+    "endYear": "",
+    "runtimeMinutes": "5",
+    "genres": [
+      "Animation",
+      "Short"
+    ]
+  }];
+
+  // create the document index
+  const index = new Document({
+    worker: true,
+    document: {
+      id: "tconst",
+      store: true,
+      index: [{
+        field: "primaryTitle",
+        tokenize: "forward",
+        encoder: "LatinBalance"
+      },{
+        field: "originalTitle",
+        tokenize: "forward",
+        encoder: "LatinBalance"
+      }],
+      tag: [{
+        field: "startYear"
+      },{
+        field: "genres"
+      }]
+    }
+  });
+
+  // add test data
+  for(let i = 0; i < data.length; i++){
+    await index.add(data[i]);
+  }
+
+  // perform a query
+  const result = await index.search({
+    query: "karmen",
+    tag: {
+      "startYear": "1894",
+      "genres": [
+        "Documentary",
+        "Short"
+      ]
+    },
+    enrich: true
+  });
+
+  // display results
+  console.log(result);
+  log(JSON.stringify(result, null, 2));
+  log("\n-------------------------------------\n");
+
+  // perform a query + merge results
+  const merged = await index.search({
+    query: "karmen",
+    tag: {
+      "startYear": "1894",
+      "genres": [
+        "Documentary",
+        "Short"
+      ]
+    },
+    enrich: true,
+    merge: true
+  });
+
+  // display results
+  console.log(merged);
+  log(JSON.stringify(merged, null, 2));
+  log("\n-------------------------------------\n");
+
+  // perform a query + get suggestions
+  const suggestions = await index.search({
+    query: "karmen or clown or not found",
+    tag: {
+      // no data for this category:
+      "genres": "Movie"
+    },
+    suggest: true,
+    enrich: true,
+    merge: true
+  });
+
+  // display results
+  console.log(suggestions);
+  log(JSON.stringify(suggestions, null, 2));
+
+  function log(str){
+    document.body.appendChild(
+      document.createTextNode(str + "\n")
+    );
+  }
+
+</script>
+</body>
+</html>
\ No newline at end of file
diff --git a/example/browser-module/document/index.html b/example/browser-module/document/index.html
new file mode 100644
index 0000000..b46665a
--- /dev/null
+++ b/example/browser-module/document/index.html
@@ -0,0 +1,129 @@
+<!DOCTYPE html>
+<html lang="en">
+<head>
+  <meta charset="utf-8">
+  <meta name="viewport" content="width=device-width, height=device-height">
+  <title>Example: browser-document</title>
+</head>
+<body style="white-space: pre">
+<script type="module">
+
+  import { Document, Charset } from "https://rawcdn.githack.com/nextapps-de/flexsearch/v0.8-preview/dist/flexsearch.compact.module.min.js";
+
+  // some test data
+  const data = [{
+    "tconst": "tt0000001",
+    "titleType": "short",
+    "primaryTitle": "Carmencita",
+    "originalTitle": "Carmencita",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Documentary",
+      "Short"
+    ]
+  },{
+    "tconst": "tt0000002",
+    "titleType": "short",
+    "primaryTitle": "Le clown et ses chiens",
+    "originalTitle": "Le clown et ses chiens",
+    "isAdult": 0,
+    "startYear": "1892",
+    "endYear": "",
+    "runtimeMinutes": "5",
+    "genres": [
+      "Animation",
+      "Short"
+    ]
+  }];
+
+  // create the document index
+  const index = new Document({
+    document: {
+      id: "tconst",
+      store: true,
+      index: [{
+        field: "primaryTitle",
+        tokenize: "forward",
+        encoder: Charset.LatinBalance
+      },{
+        field: "originalTitle",
+        tokenize: "forward",
+        encoder: Charset.LatinBalance
+      }],
+      tag: [{
+        field: "startYear"
+      },{
+        field: "genres"
+      }]
+    }
+  });
+
+  // add test data
+  for(let i = 0; i < data.length; i++){
+    index.add(data[i]);
+  }
+
+  // perform a query
+  const result = index.search({
+    query: "karmen",
+    tag: {
+      "startYear": "1894",
+      "genres": [
+        "Documentary",
+        "Short"
+      ]
+    },
+    enrich: true
+  });
+
+  // display results
+  console.log(result);
+  log(JSON.stringify(result, null, 2));
+  log("\n-------------------------------------\n");
+
+  // perform a query + merge results
+  const merged = index.search({
+    query: "karmen",
+    tag: {
+      "startYear": "1894",
+      "genres": [
+        "Documentary",
+        "Short"
+      ]
+    },
+    enrich: true,
+    merge: true
+  });
+
+  // display results
+  console.log(merged);
+  log(JSON.stringify(merged, null, 2));
+  log("\n-------------------------------------\n");
+
+  // perform a query + get suggestions
+  const suggestions = index.search({
+    query: "karmen or clown or not found",
+    tag: {
+      // no data for this category:
+      "genres": "Movie"
+    },
+    suggest: true,
+    enrich: true,
+    merge: true
+  });
+
+  // display results
+  console.log(suggestions);
+  log(JSON.stringify(suggestions, null, 2));
+
+  function log(str){
+    document.body.appendChild(
+      document.createTextNode(str + "\n")
+    );
+  }
+</script>
+</body>
+</html>
\ No newline at end of file
diff --git a/example/nodejs-commonjs/document-persistent/README.md b/example/nodejs-commonjs/document-persistent/README.md
new file mode 100644
index 0000000..864ef27
--- /dev/null
+++ b/example/nodejs-commonjs/document-persistent/README.md
@@ -0,0 +1,7 @@
+```bash
+npm install git+https://github.com/nextapps-de/flexsearch/tree/v0.8-preview
+```
+
+```bash
+node index.js
+```
\ No newline at end of file
diff --git a/example/nodejs-document/data.json b/example/nodejs-commonjs/document-persistent/data.json
similarity index 100%
rename from example/nodejs-document/data.json
rename to example/nodejs-commonjs/document-persistent/data.json
diff --git a/example/nodejs-persistent/commonjs/index.js b/example/nodejs-commonjs/document-persistent/index.js
similarity index 95%
rename from example/nodejs-persistent/commonjs/index.js
rename to example/nodejs-commonjs/document-persistent/index.js
index 7795153..7eabe55 100644
--- a/example/nodejs-persistent/commonjs/index.js
+++ b/example/nodejs-commonjs/document-persistent/index.js
@@ -6,7 +6,7 @@ const Sqlite = require("flexsearch/db/sqlite");
 // const Clickhouse = require("flexsearch/db/clickhouse");
 
 // loading test data
-const data = require(__dirname + "/../data.json");
+const data = require(__dirname + "/data.json");
 
 (async function(){
 
@@ -35,6 +35,7 @@ const data = require(__dirname + "/../data.json");
         }
     });
 
+    // mount database to the index
     await document.mount(db);
     // await document.destroy();
     // await document.mount(db);
diff --git a/example/nodejs-persistent/package.json b/example/nodejs-commonjs/document-persistent/package.json
similarity index 70%
rename from example/nodejs-persistent/package.json
rename to example/nodejs-commonjs/document-persistent/package.json
index 5ee75c9..20bc525 100644
--- a/example/nodejs-persistent/package.json
+++ b/example/nodejs-commonjs/document-persistent/package.json
@@ -1,5 +1,5 @@
 {
-  "name": "nodejs-persistent",
+  "name": "nodejs-commonjs-document-persistent",
   "dependencies": {
     "flexsearch": "github:nextapps-de/flexsearch#v0.8-preview",
     "sqlite3": "^5.1.7"
diff --git a/example/nodejs-commonjs/document-worker-extern-config/README.md b/example/nodejs-commonjs/document-worker-extern-config/README.md
new file mode 100644
index 0000000..864ef27
--- /dev/null
+++ b/example/nodejs-commonjs/document-worker-extern-config/README.md
@@ -0,0 +1,7 @@
+```bash
+npm install git+https://github.com/nextapps-de/flexsearch/tree/v0.8-preview
+```
+
+```bash
+node index.js
+```
\ No newline at end of file
diff --git a/example/nodejs-commonjs/document-worker-extern-config/config.originalTitle.js b/example/nodejs-commonjs/document-worker-extern-config/config.originalTitle.js
new file mode 100644
index 0000000..3f28885
--- /dev/null
+++ b/example/nodejs-commonjs/document-worker-extern-config/config.originalTitle.js
@@ -0,0 +1,17 @@
+const { Encoder, Charset } = require("flexsearch");
+const EnglishPreset  = require("flexsearch/lang/en");
+
+module.exports = {
+    tokenize: "forward",
+    encoder: new Encoder(
+        Charset.LatinBalance,
+        EnglishPreset,
+        {
+            normalize: function(str){
+                return str.toLowerCase();
+            },
+            filter: false,
+            minlength: 3
+        }
+    )
+};
\ No newline at end of file
diff --git a/example/nodejs-commonjs/document-worker-extern-config/config.primaryTitle.js b/example/nodejs-commonjs/document-worker-extern-config/config.primaryTitle.js
new file mode 100644
index 0000000..3f28885
--- /dev/null
+++ b/example/nodejs-commonjs/document-worker-extern-config/config.primaryTitle.js
@@ -0,0 +1,17 @@
+const { Encoder, Charset } = require("flexsearch");
+const EnglishPreset  = require("flexsearch/lang/en");
+
+module.exports = {
+    tokenize: "forward",
+    encoder: new Encoder(
+        Charset.LatinBalance,
+        EnglishPreset,
+        {
+            normalize: function(str){
+                return str.toLowerCase();
+            },
+            filter: false,
+            minlength: 3
+        }
+    )
+};
\ No newline at end of file
diff --git a/example/nodejs-persistent/data.json b/example/nodejs-commonjs/document-worker-extern-config/data.json
similarity index 100%
rename from example/nodejs-persistent/data.json
rename to example/nodejs-commonjs/document-worker-extern-config/data.json
diff --git a/example/nodejs-commonjs/document-worker-extern-config/index.js b/example/nodejs-commonjs/document-worker-extern-config/index.js
new file mode 100644
index 0000000..08c5f43
--- /dev/null
+++ b/example/nodejs-commonjs/document-worker-extern-config/index.js
@@ -0,0 +1,51 @@
+const { Document } = require("flexsearch");
+
+// loading test data
+const data = require(__dirname + "/data.json");
+
+(async function(){
+
+    // create the document and await (!) for the instance response
+    const document = await new Document({
+        worker: true,
+        document: {
+            id: "tconst",
+            store: true,
+            index: [{
+                field: "primaryTitle",
+                config: __dirname + "/config.primaryTitle.js"
+            },{
+                field: "originalTitle",
+                config: __dirname + "/config.primaryTitle.js"
+            }],
+            tag: [{
+                field: "startYear"
+            },{
+                field: "genres"
+            }]
+        }
+    });
+
+    // add test data
+    for(let i = 0; i < data.length; i++){
+        await document.add(data[i]);
+    }
+
+    // perform a query
+    const result = await document.search({
+        query: "karmen",
+        tag: {
+            "startYear": "1894",
+            "genres": [
+                "Documentary",
+                "Short"
+            ]
+        },
+        suggest: true,
+        enrich: true,
+        merge: true
+    });
+
+    console.log(result);
+
+}());
diff --git a/example/nodejs-commonjs/document-worker-extern-config/package.json b/example/nodejs-commonjs/document-worker-extern-config/package.json
new file mode 100644
index 0000000..e715c7b
--- /dev/null
+++ b/example/nodejs-commonjs/document-worker-extern-config/package.json
@@ -0,0 +1,6 @@
+{
+  "name": "nodejs-commonjs-document-worker-extern-config",
+  "dependencies": {
+    "flexsearch": "github:nextapps-de/flexsearch#v0.8-preview"
+  }
+}
diff --git a/example/nodejs-commonjs/document-worker/README.md b/example/nodejs-commonjs/document-worker/README.md
new file mode 100644
index 0000000..864ef27
--- /dev/null
+++ b/example/nodejs-commonjs/document-worker/README.md
@@ -0,0 +1,7 @@
+```bash
+npm install git+https://github.com/nextapps-de/flexsearch/tree/v0.8-preview
+```
+
+```bash
+node index.js
+```
\ No newline at end of file
diff --git a/example/nodejs-worker-persistent/data.json b/example/nodejs-commonjs/document-worker/data.json
similarity index 100%
rename from example/nodejs-worker-persistent/data.json
rename to example/nodejs-commonjs/document-worker/data.json
diff --git a/example/nodejs-worker/commonjs/index.js b/example/nodejs-commonjs/document-worker/index.js
similarity index 83%
rename from example/nodejs-worker/commonjs/index.js
rename to example/nodejs-commonjs/document-worker/index.js
index 673f66a..deebd28 100644
--- a/example/nodejs-worker/commonjs/index.js
+++ b/example/nodejs-commonjs/document-worker/index.js
@@ -1,7 +1,7 @@
 const { Document } = require("flexsearch");
 
 // loading test data
-const data = require(__dirname + "/../data.json");
+const data = require(__dirname + "/data.json");
 
 (async function(){
 
@@ -14,11 +14,11 @@ const data = require(__dirname + "/../data.json");
             index: [{
                 field: "primaryTitle",
                 tokenize: "forward",
-                config: __dirname + "/config.primaryTitle.js"
+                encoder: "LatinBalance"
             },{
                 field: "originalTitle",
                 tokenize: "forward",
-                config: __dirname + "/config.originalTitle.js"
+                encoder: "LatinBalance"
             }],
             tag: [{
                 field: "startYear"
@@ -35,7 +35,7 @@ const data = require(__dirname + "/../data.json");
 
     // perform a query
     const result = await document.search({
-        query: "carmen",
+        query: "karmen",
         tag: {
             "startYear": "1894",
             "genres": [
diff --git a/example/nodejs-commonjs/document-worker/package.json b/example/nodejs-commonjs/document-worker/package.json
new file mode 100644
index 0000000..cdf2c51
--- /dev/null
+++ b/example/nodejs-commonjs/document-worker/package.json
@@ -0,0 +1,6 @@
+{
+  "name": "nodejs-commonjs-document-worker",
+  "dependencies": {
+    "flexsearch": "github:nextapps-de/flexsearch#v0.8-preview"
+  }
+}
diff --git a/example/nodejs-commonjs/document/README.md b/example/nodejs-commonjs/document/README.md
new file mode 100644
index 0000000..864ef27
--- /dev/null
+++ b/example/nodejs-commonjs/document/README.md
@@ -0,0 +1,7 @@
+```bash
+npm install git+https://github.com/nextapps-de/flexsearch/tree/v0.8-preview
+```
+
+```bash
+node index.js
+```
\ No newline at end of file
diff --git a/example/nodejs-worker/data.json b/example/nodejs-commonjs/document/data.json
similarity index 100%
rename from example/nodejs-worker/data.json
rename to example/nodejs-commonjs/document/data.json
diff --git a/example/nodejs-document/commonjs/index.js b/example/nodejs-commonjs/document/index.js
similarity index 83%
rename from example/nodejs-document/commonjs/index.js
rename to example/nodejs-commonjs/document/index.js
index ec6037e..1badc89 100644
--- a/example/nodejs-document/commonjs/index.js
+++ b/example/nodejs-commonjs/document/index.js
@@ -1,7 +1,7 @@
 const { Document, Charset } = require("flexsearch");
 
 // loading test data
-const data = require(__dirname + "/../data.json");
+const data = require(__dirname + "/data.json");
 
 // create the document index
 const document = new Document({
@@ -11,11 +11,11 @@ const document = new Document({
         index: [{
             field: "primaryTitle",
             tokenize: "forward",
-            encoder: Charset.LatinSimple
+            encoder: Charset.LatinBalance
         },{
             field: "originalTitle",
             tokenize: "forward",
-            encoder: Charset.LatinSimple
+            encoder: Charset.LatinBalance
         }],
         tag: [{
             field: "startYear"
@@ -32,7 +32,7 @@ for(let i = 0; i < data.length; i++){
 
 // perform a query
 const result = document.search({
-    query: "carmencita",
+    query: "karmen",
     tag: {
         "startYear": "1894",
         "genres": [
diff --git a/example/nodejs-worker/package.json b/example/nodejs-commonjs/document/package.json
similarity index 70%
rename from example/nodejs-worker/package.json
rename to example/nodejs-commonjs/document/package.json
index 50b0b2d..2fbc471 100644
--- a/example/nodejs-worker/package.json
+++ b/example/nodejs-commonjs/document/package.json
@@ -1,5 +1,5 @@
 {
-  "name": "nodejs-worker",
+  "name": "nodejs-commonjs-document",
   "dependencies": {
     "flexsearch": "github:nextapps-de/flexsearch#v0.8-preview"
   }
diff --git a/example/nodejs-document/esm/package.json b/example/nodejs-document/esm/package.json
deleted file mode 100644
index 3dbc1ca..0000000
--- a/example/nodejs-document/esm/package.json
+++ /dev/null
@@ -1,3 +0,0 @@
-{
-  "type": "module"
-}
diff --git a/example/nodejs-esm/document-persistent/README.md b/example/nodejs-esm/document-persistent/README.md
new file mode 100644
index 0000000..864ef27
--- /dev/null
+++ b/example/nodejs-esm/document-persistent/README.md
@@ -0,0 +1,7 @@
+```bash
+npm install git+https://github.com/nextapps-de/flexsearch/tree/v0.8-preview
+```
+
+```bash
+node index.js
+```
\ No newline at end of file
diff --git a/example/nodejs-esm/document-persistent/data.json b/example/nodejs-esm/document-persistent/data.json
new file mode 100644
index 0000000..1fd5660
--- /dev/null
+++ b/example/nodejs-esm/document-persistent/data.json
@@ -0,0 +1,141 @@
+[
+  {
+    "tconst": "tt0000001",
+    "titleType": "short",
+    "primaryTitle": "Carmencita",
+    "originalTitle": "Carmencita",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Documentary",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000002",
+    "titleType": "short",
+    "primaryTitle": "Le clown et ses chiens",
+    "originalTitle": "Le clown et ses chiens",
+    "isAdult": 0,
+    "startYear": "1892",
+    "endYear": "",
+    "runtimeMinutes": "5",
+    "genres": [
+      "Animation",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000003",
+    "titleType": "short",
+    "primaryTitle": "Pauvre Pierrot",
+    "originalTitle": "Pauvre Pierrot",
+    "isAdult": 0,
+    "startYear": "1892",
+    "endYear": "",
+    "runtimeMinutes": "4",
+    "genres": [
+      "Animation",
+      "Comedy",
+      "Romance"
+    ]
+  },
+  {
+    "tconst": "tt0000004",
+    "titleType": "short",
+    "primaryTitle": "Un bon bock",
+    "originalTitle": "Un bon bock",
+    "isAdult": 0,
+    "startYear": "1892",
+    "endYear": "",
+    "runtimeMinutes": "12",
+    "genres": [
+      "Animation",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000005",
+    "titleType": "short",
+    "primaryTitle": "Blacksmith Scene",
+    "originalTitle": "Blacksmith Scene",
+    "isAdult": 0,
+    "startYear": "1893",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Comedy",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000006",
+    "titleType": "short",
+    "primaryTitle": "Chinese Opium Den",
+    "originalTitle": "Chinese Opium Den",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000007",
+    "titleType": "short",
+    "primaryTitle": "Corbett and Courtney Before the Kinetograph",
+    "originalTitle": "Corbett and Courtney Before the Kinetograph",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Short",
+      "Sport"
+    ]
+  },
+  {
+    "tconst": "tt0000008",
+    "titleType": "short",
+    "primaryTitle": "Edison Kinetoscopic Record of a Sneeze",
+    "originalTitle": "Edison Kinetoscopic Record of a Sneeze",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Documentary",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000009",
+    "titleType": "movie",
+    "primaryTitle": "Miss Jerry",
+    "originalTitle": "Miss Jerry",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "45",
+    "genres": [
+      "Romance"
+    ]
+  },
+  {
+    "tconst": "tt0000010",
+    "titleType": "short",
+    "primaryTitle": "Leaving the Factory",
+    "originalTitle": "La sortie de l'usine Lumière à Lyon",
+    "isAdult": 0,
+    "startYear": "1895",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Documentary",
+      "Short"
+    ]
+  }
+]
\ No newline at end of file
diff --git a/example/nodejs-persistent/esm/index.js b/example/nodejs-esm/document-persistent/index.js
similarity index 83%
rename from example/nodejs-persistent/esm/index.js
rename to example/nodejs-esm/document-persistent/index.js
index 4d4c99f..34c3e5d 100644
--- a/example/nodejs-persistent/esm/index.js
+++ b/example/nodejs-esm/document-persistent/index.js
@@ -1,17 +1,18 @@
 import { Document, Charset } from "flexsearch/esm";
+import { promises as fs } from "fs";
+const dirname = import.meta.dirname;
+
 import Sqlite from "flexsearch/db/sqlite";
 // import Postgres from "flexsearch/db/postgres";
 // import MongoDB from "flexsearch/db/mongodb";
 // import Redis from "flexsearch/db/redis";
 // import Clickhouse from "flexsearch/db/clickhouse";
-import fs from "fs";
-
-const dirname = import.meta.dirname;
-// loading test data
-const data = JSON.parse(fs.readFileSync(dirname + "/../data.json", "utf8"));
 
 (async function(){
 
+    // loading test data
+    const data = JSON.parse(await fs.readFile(dirname + "/data.json"));
+
     // create DB instance with namespace
     const db = new Sqlite("my-store");
 
@@ -23,11 +24,11 @@ const data = JSON.parse(fs.readFileSync(dirname + "/../data.json", "utf8"));
             index: [{
                 field: "primaryTitle",
                 tokenize: "forward",
-                encoder: Charset.LatinSimple
+                encoder: Charset.LatinBalance
             },{
                 field: "originalTitle",
                 tokenize: "forward",
-                encoder: Charset.LatinSimple
+                encoder: Charset.LatinBalance
             }],
             tag: [{
                 field: "startYear"
@@ -46,12 +47,12 @@ const data = JSON.parse(fs.readFileSync(dirname + "/../data.json", "utf8"));
         document.add(data[i]);
     }
 
-    // transfer changes (bulk)
+    // transfer changes in bulk
     await document.commit();
 
     // perform a query
     const result = await document.search({
-        query: "carmen",
+        query: "karmen",
         tag: {
             "startYear": "1894",
             "genres": [
diff --git a/example/nodejs-worker-persistent/package.json b/example/nodejs-esm/document-persistent/package.json
similarity index 64%
rename from example/nodejs-worker-persistent/package.json
rename to example/nodejs-esm/document-persistent/package.json
index 06712a4..b5e5d6e 100644
--- a/example/nodejs-worker-persistent/package.json
+++ b/example/nodejs-esm/document-persistent/package.json
@@ -1,5 +1,6 @@
 {
-  "name": "nodejs-worker-persistent",
+  "name": "nodejs-esm-document-persistent",
+  "type": "module",
   "dependencies": {
     "flexsearch": "github:nextapps-de/flexsearch#v0.8-preview",
     "sqlite3": "^5.1.7"
diff --git a/example/nodejs-esm/document-worker-extern-config/README.md b/example/nodejs-esm/document-worker-extern-config/README.md
new file mode 100644
index 0000000..864ef27
--- /dev/null
+++ b/example/nodejs-esm/document-worker-extern-config/README.md
@@ -0,0 +1,7 @@
+```bash
+npm install git+https://github.com/nextapps-de/flexsearch/tree/v0.8-preview
+```
+
+```bash
+node index.js
+```
\ No newline at end of file
diff --git a/example/nodejs-esm/document-worker-extern-config/config.originalTitle.js b/example/nodejs-esm/document-worker-extern-config/config.originalTitle.js
new file mode 100644
index 0000000..566cbd0
--- /dev/null
+++ b/example/nodejs-esm/document-worker-extern-config/config.originalTitle.js
@@ -0,0 +1,17 @@
+import { Encoder, Charset } from "flexsearch/esm";
+import EnglishPreset from "flexsearch/esm/lang/en";
+
+export default {
+    tokenize: "forward",
+    encoder: new Encoder(
+        Charset.LatinBalance,
+        EnglishPreset,
+        {
+            normalize: function(str){
+                return str.toLowerCase();
+            },
+            filter: false,
+            minlength: 3
+        }
+    )
+};
\ No newline at end of file
diff --git a/example/nodejs-esm/document-worker-extern-config/config.primaryTitle.js b/example/nodejs-esm/document-worker-extern-config/config.primaryTitle.js
new file mode 100644
index 0000000..566cbd0
--- /dev/null
+++ b/example/nodejs-esm/document-worker-extern-config/config.primaryTitle.js
@@ -0,0 +1,17 @@
+import { Encoder, Charset } from "flexsearch/esm";
+import EnglishPreset from "flexsearch/esm/lang/en";
+
+export default {
+    tokenize: "forward",
+    encoder: new Encoder(
+        Charset.LatinBalance,
+        EnglishPreset,
+        {
+            normalize: function(str){
+                return str.toLowerCase();
+            },
+            filter: false,
+            minlength: 3
+        }
+    )
+};
\ No newline at end of file
diff --git a/example/nodejs-esm/document-worker-extern-config/data.json b/example/nodejs-esm/document-worker-extern-config/data.json
new file mode 100644
index 0000000..1fd5660
--- /dev/null
+++ b/example/nodejs-esm/document-worker-extern-config/data.json
@@ -0,0 +1,141 @@
+[
+  {
+    "tconst": "tt0000001",
+    "titleType": "short",
+    "primaryTitle": "Carmencita",
+    "originalTitle": "Carmencita",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Documentary",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000002",
+    "titleType": "short",
+    "primaryTitle": "Le clown et ses chiens",
+    "originalTitle": "Le clown et ses chiens",
+    "isAdult": 0,
+    "startYear": "1892",
+    "endYear": "",
+    "runtimeMinutes": "5",
+    "genres": [
+      "Animation",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000003",
+    "titleType": "short",
+    "primaryTitle": "Pauvre Pierrot",
+    "originalTitle": "Pauvre Pierrot",
+    "isAdult": 0,
+    "startYear": "1892",
+    "endYear": "",
+    "runtimeMinutes": "4",
+    "genres": [
+      "Animation",
+      "Comedy",
+      "Romance"
+    ]
+  },
+  {
+    "tconst": "tt0000004",
+    "titleType": "short",
+    "primaryTitle": "Un bon bock",
+    "originalTitle": "Un bon bock",
+    "isAdult": 0,
+    "startYear": "1892",
+    "endYear": "",
+    "runtimeMinutes": "12",
+    "genres": [
+      "Animation",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000005",
+    "titleType": "short",
+    "primaryTitle": "Blacksmith Scene",
+    "originalTitle": "Blacksmith Scene",
+    "isAdult": 0,
+    "startYear": "1893",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Comedy",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000006",
+    "titleType": "short",
+    "primaryTitle": "Chinese Opium Den",
+    "originalTitle": "Chinese Opium Den",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000007",
+    "titleType": "short",
+    "primaryTitle": "Corbett and Courtney Before the Kinetograph",
+    "originalTitle": "Corbett and Courtney Before the Kinetograph",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Short",
+      "Sport"
+    ]
+  },
+  {
+    "tconst": "tt0000008",
+    "titleType": "short",
+    "primaryTitle": "Edison Kinetoscopic Record of a Sneeze",
+    "originalTitle": "Edison Kinetoscopic Record of a Sneeze",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Documentary",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000009",
+    "titleType": "movie",
+    "primaryTitle": "Miss Jerry",
+    "originalTitle": "Miss Jerry",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "45",
+    "genres": [
+      "Romance"
+    ]
+  },
+  {
+    "tconst": "tt0000010",
+    "titleType": "short",
+    "primaryTitle": "Leaving the Factory",
+    "originalTitle": "La sortie de l'usine Lumière à Lyon",
+    "isAdult": 0,
+    "startYear": "1895",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Documentary",
+      "Short"
+    ]
+  }
+]
\ No newline at end of file
diff --git a/example/nodejs-worker/esm/index.js b/example/nodejs-esm/document-worker-extern-config/index.js
similarity index 75%
rename from example/nodejs-worker/esm/index.js
rename to example/nodejs-esm/document-worker-extern-config/index.js
index 0e7a507..e21184c 100644
--- a/example/nodejs-worker/esm/index.js
+++ b/example/nodejs-esm/document-worker-extern-config/index.js
@@ -1,25 +1,23 @@
 import { Document } from "flexsearch/esm";
-import fs from "fs";
-
+import { promises as fs } from "fs";
 const dirname = import.meta.dirname;
-// loading test data
-const data = JSON.parse(fs.readFileSync(dirname + "/../data.json", "utf8"));
 
 (async function(){
 
-    // create the document
-    const document = new Document({
-        worker: true,
+    // loading test data
+    const data = JSON.parse(await fs.readFile(dirname + "/data.json"));
+
+    // create the document and await (!) for the instance response
+    const document = await new Document({
+        worker: "true",
         document: {
             id: "tconst",
             store: true,
             index: [{
                 field: "primaryTitle",
-                tokenize: "forward",
                 config: dirname + "/config.primaryTitle.js"
             },{
                 field: "originalTitle",
-                tokenize: "forward",
                 config: dirname + "/config.originalTitle.js"
             }],
             tag: [{
@@ -30,6 +28,8 @@ const data = JSON.parse(fs.readFileSync(dirname + "/../data.json", "utf8"));
         }
     });
 
+    //console.log(document)
+
     // add test data
     for(let i = 0; i < data.length; i++){
         await document.add(data[i]);
@@ -37,7 +37,7 @@ const data = JSON.parse(fs.readFileSync(dirname + "/../data.json", "utf8"));
 
     // perform a query
     const result = await document.search({
-        query: "carmen",
+        query: "karmen",
         tag: {
             "startYear": "1894",
             "genres": [
diff --git a/example/nodejs-esm/document-worker-extern-config/package.json b/example/nodejs-esm/document-worker-extern-config/package.json
new file mode 100644
index 0000000..4f2a428
--- /dev/null
+++ b/example/nodejs-esm/document-worker-extern-config/package.json
@@ -0,0 +1,7 @@
+{
+  "name": "nodejs-esm-document-worker-extern-config",
+  "type": "module",
+  "dependencies": {
+    "flexsearch": "github:nextapps-de/flexsearch#v0.8-preview"
+  }
+}
diff --git a/example/nodejs-esm/document-worker/README.md b/example/nodejs-esm/document-worker/README.md
new file mode 100644
index 0000000..864ef27
--- /dev/null
+++ b/example/nodejs-esm/document-worker/README.md
@@ -0,0 +1,7 @@
+```bash
+npm install git+https://github.com/nextapps-de/flexsearch/tree/v0.8-preview
+```
+
+```bash
+node index.js
+```
\ No newline at end of file
diff --git a/example/nodejs-esm/document-worker/data.json b/example/nodejs-esm/document-worker/data.json
new file mode 100644
index 0000000..1fd5660
--- /dev/null
+++ b/example/nodejs-esm/document-worker/data.json
@@ -0,0 +1,141 @@
+[
+  {
+    "tconst": "tt0000001",
+    "titleType": "short",
+    "primaryTitle": "Carmencita",
+    "originalTitle": "Carmencita",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Documentary",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000002",
+    "titleType": "short",
+    "primaryTitle": "Le clown et ses chiens",
+    "originalTitle": "Le clown et ses chiens",
+    "isAdult": 0,
+    "startYear": "1892",
+    "endYear": "",
+    "runtimeMinutes": "5",
+    "genres": [
+      "Animation",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000003",
+    "titleType": "short",
+    "primaryTitle": "Pauvre Pierrot",
+    "originalTitle": "Pauvre Pierrot",
+    "isAdult": 0,
+    "startYear": "1892",
+    "endYear": "",
+    "runtimeMinutes": "4",
+    "genres": [
+      "Animation",
+      "Comedy",
+      "Romance"
+    ]
+  },
+  {
+    "tconst": "tt0000004",
+    "titleType": "short",
+    "primaryTitle": "Un bon bock",
+    "originalTitle": "Un bon bock",
+    "isAdult": 0,
+    "startYear": "1892",
+    "endYear": "",
+    "runtimeMinutes": "12",
+    "genres": [
+      "Animation",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000005",
+    "titleType": "short",
+    "primaryTitle": "Blacksmith Scene",
+    "originalTitle": "Blacksmith Scene",
+    "isAdult": 0,
+    "startYear": "1893",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Comedy",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000006",
+    "titleType": "short",
+    "primaryTitle": "Chinese Opium Den",
+    "originalTitle": "Chinese Opium Den",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000007",
+    "titleType": "short",
+    "primaryTitle": "Corbett and Courtney Before the Kinetograph",
+    "originalTitle": "Corbett and Courtney Before the Kinetograph",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Short",
+      "Sport"
+    ]
+  },
+  {
+    "tconst": "tt0000008",
+    "titleType": "short",
+    "primaryTitle": "Edison Kinetoscopic Record of a Sneeze",
+    "originalTitle": "Edison Kinetoscopic Record of a Sneeze",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Documentary",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000009",
+    "titleType": "movie",
+    "primaryTitle": "Miss Jerry",
+    "originalTitle": "Miss Jerry",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "45",
+    "genres": [
+      "Romance"
+    ]
+  },
+  {
+    "tconst": "tt0000010",
+    "titleType": "short",
+    "primaryTitle": "Leaving the Factory",
+    "originalTitle": "La sortie de l'usine Lumière à Lyon",
+    "isAdult": 0,
+    "startYear": "1895",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Documentary",
+      "Short"
+    ]
+  }
+]
\ No newline at end of file
diff --git a/example/nodejs-esm/document-worker/index.js b/example/nodejs-esm/document-worker/index.js
new file mode 100644
index 0000000..f00b53b
--- /dev/null
+++ b/example/nodejs-esm/document-worker/index.js
@@ -0,0 +1,55 @@
+import { Document } from "flexsearch/esm";
+import { promises as fs } from "fs";
+const dirname = import.meta.dirname;
+
+(async function(){
+
+    // loading test data
+    const data = JSON.parse(await fs.readFile(dirname + "/data.json"));
+
+    // create the document and await for the instance response
+    const document = await new Document({
+        worker: "true",
+        document: {
+            id: "tconst",
+            store: true,
+            index: [{
+                field: "primaryTitle",
+                tokenize: "forward",
+                encoder: "LatinBalance"
+            },{
+                field: "originalTitle",
+                tokenize: "forward",
+                encoder: "LatinBalance"
+            }],
+            tag: [{
+                field: "startYear"
+            },{
+                field: "genres"
+            }]
+        }
+    });
+
+    // add test data
+    for(let i = 0; i < data.length; i++){
+        await document.add(data[i]);
+    }
+
+    // perform a query
+    const result = await document.search({
+        query: "karmen",
+        tag: {
+            "startYear": "1894",
+            "genres": [
+                "Documentary",
+                "Short"
+            ]
+        },
+        suggest: true,
+        enrich: true,
+        merge: true
+    });
+
+    console.log(result);
+
+}());
diff --git a/example/nodejs-esm/document-worker/package.json b/example/nodejs-esm/document-worker/package.json
new file mode 100644
index 0000000..b98f398
--- /dev/null
+++ b/example/nodejs-esm/document-worker/package.json
@@ -0,0 +1,7 @@
+{
+  "name": "nodejs-esm-document-worker",
+  "type": "module",
+  "dependencies": {
+    "flexsearch": "github:nextapps-de/flexsearch#v0.8-preview"
+  }
+}
diff --git a/example/nodejs-esm/document/README.md b/example/nodejs-esm/document/README.md
new file mode 100644
index 0000000..864ef27
--- /dev/null
+++ b/example/nodejs-esm/document/README.md
@@ -0,0 +1,7 @@
+```bash
+npm install git+https://github.com/nextapps-de/flexsearch/tree/v0.8-preview
+```
+
+```bash
+node index.js
+```
\ No newline at end of file
diff --git a/example/nodejs-esm/document/data.json b/example/nodejs-esm/document/data.json
new file mode 100644
index 0000000..1fd5660
--- /dev/null
+++ b/example/nodejs-esm/document/data.json
@@ -0,0 +1,141 @@
+[
+  {
+    "tconst": "tt0000001",
+    "titleType": "short",
+    "primaryTitle": "Carmencita",
+    "originalTitle": "Carmencita",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Documentary",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000002",
+    "titleType": "short",
+    "primaryTitle": "Le clown et ses chiens",
+    "originalTitle": "Le clown et ses chiens",
+    "isAdult": 0,
+    "startYear": "1892",
+    "endYear": "",
+    "runtimeMinutes": "5",
+    "genres": [
+      "Animation",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000003",
+    "titleType": "short",
+    "primaryTitle": "Pauvre Pierrot",
+    "originalTitle": "Pauvre Pierrot",
+    "isAdult": 0,
+    "startYear": "1892",
+    "endYear": "",
+    "runtimeMinutes": "4",
+    "genres": [
+      "Animation",
+      "Comedy",
+      "Romance"
+    ]
+  },
+  {
+    "tconst": "tt0000004",
+    "titleType": "short",
+    "primaryTitle": "Un bon bock",
+    "originalTitle": "Un bon bock",
+    "isAdult": 0,
+    "startYear": "1892",
+    "endYear": "",
+    "runtimeMinutes": "12",
+    "genres": [
+      "Animation",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000005",
+    "titleType": "short",
+    "primaryTitle": "Blacksmith Scene",
+    "originalTitle": "Blacksmith Scene",
+    "isAdult": 0,
+    "startYear": "1893",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Comedy",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000006",
+    "titleType": "short",
+    "primaryTitle": "Chinese Opium Den",
+    "originalTitle": "Chinese Opium Den",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000007",
+    "titleType": "short",
+    "primaryTitle": "Corbett and Courtney Before the Kinetograph",
+    "originalTitle": "Corbett and Courtney Before the Kinetograph",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Short",
+      "Sport"
+    ]
+  },
+  {
+    "tconst": "tt0000008",
+    "titleType": "short",
+    "primaryTitle": "Edison Kinetoscopic Record of a Sneeze",
+    "originalTitle": "Edison Kinetoscopic Record of a Sneeze",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Documentary",
+      "Short"
+    ]
+  },
+  {
+    "tconst": "tt0000009",
+    "titleType": "movie",
+    "primaryTitle": "Miss Jerry",
+    "originalTitle": "Miss Jerry",
+    "isAdult": 0,
+    "startYear": "1894",
+    "endYear": "",
+    "runtimeMinutes": "45",
+    "genres": [
+      "Romance"
+    ]
+  },
+  {
+    "tconst": "tt0000010",
+    "titleType": "short",
+    "primaryTitle": "Leaving the Factory",
+    "originalTitle": "La sortie de l'usine Lumière à Lyon",
+    "isAdult": 0,
+    "startYear": "1895",
+    "endYear": "",
+    "runtimeMinutes": "1",
+    "genres": [
+      "Documentary",
+      "Short"
+    ]
+  }
+]
\ No newline at end of file
diff --git a/example/nodejs-document/esm/index.js b/example/nodejs-esm/document/index.js
similarity index 82%
rename from example/nodejs-document/esm/index.js
rename to example/nodejs-esm/document/index.js
index df30d03..9c53320 100644
--- a/example/nodejs-document/esm/index.js
+++ b/example/nodejs-esm/document/index.js
@@ -3,7 +3,7 @@ import fs from "fs";
 
 const dirname = import.meta.dirname;
 // loading test data
-const data = JSON.parse(fs.readFileSync(dirname + "/../data.json", "utf8"));
+const data = JSON.parse(fs.readFileSync(dirname + "/data.json", "utf8"));
 
 // create the document index
 const document = new Document({
@@ -13,11 +13,11 @@ const document = new Document({
         index: [{
             field: "primaryTitle",
             tokenize: "forward",
-            encoder: Charset.LatinSimple
+            encoder: Charset.LatinBalance
         },{
             field: "originalTitle",
             tokenize: "forward",
-            encoder: Charset.LatinSimple
+            encoder: Charset.LatinBalance
         }],
         tag: [{
             field: "startYear"
@@ -34,7 +34,7 @@ for(let i = 0; i < data.length; i++){
 
 // perform a query
 const result = document.search({
-    query: "carmencita",
+    query: "karmen",
     tag: {
         "startYear": "1894",
         "genres": [
diff --git a/example/nodejs-esm/document/package.json b/example/nodejs-esm/document/package.json
new file mode 100644
index 0000000..6153cac
--- /dev/null
+++ b/example/nodejs-esm/document/package.json
@@ -0,0 +1,7 @@
+{
+  "name": "nodejs-esm-document",
+  "type": "module",
+  "dependencies": {
+    "flexsearch": "github:nextapps-de/flexsearch#v0.8-preview"
+  }
+}
diff --git a/example/nodejs-worker-persistent/commonjs/config.genres.js b/example/nodejs-worker-persistent/commonjs/config.genres.js
deleted file mode 100644
index 353b186..0000000
--- a/example/nodejs-worker-persistent/commonjs/config.genres.js
+++ /dev/null
@@ -1,11 +0,0 @@
-const Sqlite = require("flexsearch/db/sqlite");
-// const Postgres = require("flexsearch/db/postgres");
-// const MongoDB = require("flexsearch/db/mongodb");
-// const Redis = require("flexsearch/db/redis");
-// const Clickhouse = require("flexsearch/db/clickhouse");
-
-module.exports = {
-    db: new Sqlite("my-store", {
-        field: "genres"
-    })
-};
\ No newline at end of file
diff --git a/example/nodejs-worker-persistent/commonjs/config.originalTitle.js b/example/nodejs-worker-persistent/commonjs/config.originalTitle.js
deleted file mode 100644
index 91dd987..0000000
--- a/example/nodejs-worker-persistent/commonjs/config.originalTitle.js
+++ /dev/null
@@ -1,14 +0,0 @@
-const Sqlite = require("flexsearch/db/sqlite");
-// const Postgres = require("flexsearch/db/postgres");
-// const MongoDB = require("flexsearch/db/mongodb");
-// const Redis = require("flexsearch/db/redis");
-// const Clickhouse = require("flexsearch/db/clickhouse");
-const { Charset } = require("flexsearch");
-
-module.exports = {
-    tokenize: "forward",
-    encoder: Charset.LatinSimple,
-    db: new Sqlite("my-store", {
-        field: "originalTitle"
-    })
-};
\ No newline at end of file
diff --git a/example/nodejs-worker-persistent/commonjs/config.primaryTitle.js b/example/nodejs-worker-persistent/commonjs/config.primaryTitle.js
deleted file mode 100644
index f71c2de..0000000
--- a/example/nodejs-worker-persistent/commonjs/config.primaryTitle.js
+++ /dev/null
@@ -1,14 +0,0 @@
-const Sqlite = require("flexsearch/db/sqlite");
-// const Postgres = require("flexsearch/db/postgres");
-// const MongoDB = require("flexsearch/db/mongodb");
-// const Redis = require("flexsearch/db/redis");
-// const Clickhouse = require("flexsearch/db/clickhouse");
-const { Charset } = require("flexsearch");
-
-module.exports = {
-    tokenize: "forward",
-    encoder: Charset.LatinSimple,
-    db: new Sqlite("my-store", {
-        field: "primaryTitle"
-    })
-};
\ No newline at end of file
diff --git a/example/nodejs-worker-persistent/commonjs/config.startYear.js b/example/nodejs-worker-persistent/commonjs/config.startYear.js
deleted file mode 100644
index a1f4c69..0000000
--- a/example/nodejs-worker-persistent/commonjs/config.startYear.js
+++ /dev/null
@@ -1,11 +0,0 @@
-const Sqlite = require("flexsearch/db/sqlite");
-// const Postgres = require("flexsearch/db/postgres");
-// const MongoDB = require("flexsearch/db/mongodb");
-// const Redis = require("flexsearch/db/redis");
-// const Clickhouse = require("flexsearch/db/clickhouse");
-
-module.exports = {
-    db: new Sqlite("my-store", {
-        field: "startYear"
-    })
-};
\ No newline at end of file
diff --git a/example/nodejs-worker-persistent/commonjs/index.js b/example/nodejs-worker-persistent/commonjs/index.js
deleted file mode 100644
index 7a9fdc6..0000000
--- a/example/nodejs-worker-persistent/commonjs/index.js
+++ /dev/null
@@ -1,70 +0,0 @@
-const { Document } = require("flexsearch");
-const Sqlite = require("flexsearch/db/sqlite");
-// const Postgres = require("flexsearch/db/postgres");
-// const MongoDB = require("flexsearch/db/mongodb");
-// const Redis = require("flexsearch/db/redis");
-// const Clickhouse = require("flexsearch/db/clickhouse");
-
-// loading test data
-const data = require(__dirname + "/../data.json");
-
-(async function(){
-
-    // create DB instance with namespace
-    const db = new Sqlite("my-store");
-
-    // create the document index
-    const document = new Document({
-        worker: true,
-        document: {
-            id: "tconst",
-            store: true,
-            index: [{
-                field: "primaryTitle",
-                tokenize: "forward",
-                config: __dirname + "/config.primaryTitle.js"
-            },{
-                field: "originalTitle",
-                tokenize: "forward",
-                config: __dirname + "/config.originalTitle.js"
-            }],
-            tag: [{
-                field: "startYear",
-                config: __dirname + "/config.startYear.js"
-            },{
-                field: "genres",
-                config: __dirname + "/config.genres.js"
-            }]
-        }
-    });
-
-    await document.mount(db);
-    // await document.destroy();
-    // await document.mount(db);
-
-    // add test data
-    for(let i = 0; i < data.length; i++){
-        document.add(data[i]);
-    }
-
-    // transfer changes (bulk)
-    await document.commit();
-
-    // perform a query
-    const result = await document.search({
-        query: "carmen",
-        tag: {
-            "startYear": "1894",
-            "genres": [
-                "Documentary",
-                "Short"
-            ]
-        },
-        suggest: true,
-        enrich: true,
-        merge: true
-    });
-
-    console.log(result);
-
-}());
diff --git a/example/nodejs-worker-persistent/esm/config.genres.js b/example/nodejs-worker-persistent/esm/config.genres.js
deleted file mode 100644
index 6239642..0000000
--- a/example/nodejs-worker-persistent/esm/config.genres.js
+++ /dev/null
@@ -1,11 +0,0 @@
-import Sqlite from "flexsearch/db/sqlite";
-// import Postgres from "flexsearch/db/postgres";
-// import MongoDB from "flexsearch/db/mongodb";
-// import Redis from "flexsearch/db/redis";
-// import Clickhouse from "flexsearch/db/clickhouse";
-
-export default {
-    db: new Sqlite("my-store", {
-        field: "genres"
-    })
-};
\ No newline at end of file
diff --git a/example/nodejs-worker-persistent/esm/config.originalTitle.js b/example/nodejs-worker-persistent/esm/config.originalTitle.js
deleted file mode 100644
index 1b4f199..0000000
--- a/example/nodejs-worker-persistent/esm/config.originalTitle.js
+++ /dev/null
@@ -1,14 +0,0 @@
-import Sqlite from "flexsearch/db/sqlite";
-// import Postgres from "flexsearch/db/postgres";
-// import MongoDB from "flexsearch/db/mongodb";
-// import Redis from "flexsearch/db/redis";
-// import Clickhouse from "flexsearch/db/clickhouse";
-import { Charset } from "flexsearch/esm";
-
-export default {
-    tokenize: "forward",
-    encoder: Charset.LatinSimple,
-    db: new Sqlite("my-store", {
-        field: "originalTitle"
-    })
-};
\ No newline at end of file
diff --git a/example/nodejs-worker-persistent/esm/config.primaryTitle.js b/example/nodejs-worker-persistent/esm/config.primaryTitle.js
deleted file mode 100644
index 8a18a1c..0000000
--- a/example/nodejs-worker-persistent/esm/config.primaryTitle.js
+++ /dev/null
@@ -1,14 +0,0 @@
-import Sqlite from "flexsearch/db/sqlite";
-// import Postgres from "flexsearch/db/postgres";
-// import MongoDB from "flexsearch/db/mongodb";
-// import Redis from "flexsearch/db/redis";
-// import Clickhouse from "flexsearch/db/clickhouse";
-import { Charset } from "flexsearch/esm";
-
-export default {
-    tokenize: "forward",
-    encoder: Charset.LatinSimple,
-    db: new Sqlite("my-store", {
-        field: "primaryTitle"
-    })
-};
\ No newline at end of file
diff --git a/example/nodejs-worker-persistent/esm/config.startYear.js b/example/nodejs-worker-persistent/esm/config.startYear.js
deleted file mode 100644
index e4bce21..0000000
--- a/example/nodejs-worker-persistent/esm/config.startYear.js
+++ /dev/null
@@ -1,11 +0,0 @@
-import Sqlite from "flexsearch/db/sqlite";
-// import Postgres from "flexsearch/db/postgres";
-// import MongoDB from "flexsearch/db/mongodb";
-// import Redis from "flexsearch/db/redis";
-// import Clickhouse from "flexsearch/db/clickhouse";
-
-export default {
-    db: new Sqlite("my-store", {
-        field: "startYear"
-    })
-};
\ No newline at end of file
diff --git a/example/nodejs-worker-persistent/esm/index.js b/example/nodejs-worker-persistent/esm/index.js
deleted file mode 100644
index b51ffca..0000000
--- a/example/nodejs-worker-persistent/esm/index.js
+++ /dev/null
@@ -1,72 +0,0 @@
-import { Document } from "flexsearch/esm";
-import Sqlite from "flexsearch/esm/db/sqlite";
-// import Postgres from "flexsearch/db/postgres";
-// import MongoDB from "flexsearch/db/mongodb";
-// import Redis from "flexsearch/db/redis";
-// import Clickhouse from "flexsearch/db/clickhouse";
-import fs from "fs";
-
-const dirname = import.meta.dirname;
-// loading test data
-const data = JSON.parse(fs.readFileSync(dirname + "/../data.json", "utf8"));
-
-(async function(){
-
-    // create DB instance with namespace
-    const db = new Sqlite("my-store");
-
-    // create the document index
-    const document = new Document({
-        worker: true,
-        document: {
-            id: "tconst",
-            store: true,
-            index: [{
-                field: "primaryTitle",
-                tokenize: "forward",
-                config: dirname + "/config.primaryTitle.js"
-            },{
-                field: "originalTitle",
-                tokenize: "forward",
-                config: dirname + "/config.originalTitle.js"
-            }],
-            tag: [{
-                field: "startYear",
-                config: dirname + "/config.startYear.js"
-            },{
-                field: "genres",
-                config: dirname + "/config.genres.js"
-            }]
-        }
-    });
-
-    await document.mount(db);
-    // await document.destroy();
-    // await document.mount(db);
-
-    // add test data
-    for(let i = 0; i < data.length; i++){
-        document.add(data[i]);
-    }
-
-    // transfer changes (bulk)
-    await document.commit();
-
-    // perform a query
-    const result = await document.search({
-        query: "carmen",
-        tag: {
-            "startYear": "1894",
-            "genres": [
-                "Documentary",
-                "Short"
-            ]
-        },
-        suggest: true,
-        enrich: true,
-        merge: true
-    });
-
-    console.log(result);
-
-}());
diff --git a/example/nodejs-worker/commonjs/config.originalTitle.js b/example/nodejs-worker/commonjs/config.originalTitle.js
deleted file mode 100644
index 8071c54..0000000
--- a/example/nodejs-worker/commonjs/config.originalTitle.js
+++ /dev/null
@@ -1,6 +0,0 @@
-const { Charset } = require("flexsearch");
-
-module.exports = {
-    tokenize: "forward",
-    encoder: Charset.LatinSimple
-};
\ No newline at end of file
diff --git a/example/nodejs-worker/commonjs/config.primaryTitle.js b/example/nodejs-worker/commonjs/config.primaryTitle.js
deleted file mode 100644
index 8071c54..0000000
--- a/example/nodejs-worker/commonjs/config.primaryTitle.js
+++ /dev/null
@@ -1,6 +0,0 @@
-const { Charset } = require("flexsearch");
-
-module.exports = {
-    tokenize: "forward",
-    encoder: Charset.LatinSimple
-};
\ No newline at end of file
diff --git a/example/nodejs-worker/esm/config.originalTitle.js b/example/nodejs-worker/esm/config.originalTitle.js
deleted file mode 100644
index b894502..0000000
--- a/example/nodejs-worker/esm/config.originalTitle.js
+++ /dev/null
@@ -1,6 +0,0 @@
-import { Charset } from "flexsearch/esm";
-
-export default {
-    tokenize: "forward",
-    encoder: Charset.LatinSimple
-};
\ No newline at end of file
diff --git a/example/nodejs-worker/esm/config.primaryTitle.js b/example/nodejs-worker/esm/config.primaryTitle.js
deleted file mode 100644
index b894502..0000000
--- a/example/nodejs-worker/esm/config.primaryTitle.js
+++ /dev/null
@@ -1,6 +0,0 @@
-import { Charset } from "flexsearch/esm";
-
-export default {
-    tokenize: "forward",
-    encoder: Charset.LatinSimple
-};
\ No newline at end of file
diff --git a/src/worker.js b/src/worker.js
index b5c640d..314a14d 100644
--- a/src/worker.js
+++ b/src/worker.js
@@ -84,7 +84,7 @@ export default function WorkerIndex(options = {}){
     }
 
     const worker = create(factory, is_node_js, options.worker);
-    worker.worker = true;
+    //worker.worker = true;
     return worker.then
         ? worker.then(function(worker){
             return init.call(_self, worker);
@@ -159,7 +159,7 @@ function create(factory, is_node_js, worker_path){
                 )
             ))
         :
-            new window.Worker(is_string(worker_path) ? worker_path : import.meta.url.replace("/worker.js", "/worker/worker.js") /*"worker/worker.js"*/, { type: "module" })
+            new window.Worker(is_string(worker_path) ? worker_path : import.meta.url.replace("/worker.js", "/worker/worker.js").replace("flexsearch.bundle.module.min.js", "module/worker/worker.js") /*"worker/worker.js"*/, { type: "module" })
     );
 
     return worker;