diff --git a/dist/flexsearch.min.js b/dist/flexsearch.bundle.js
similarity index 81%
rename from dist/flexsearch.min.js
rename to dist/flexsearch.bundle.js
index 01f08e4..be4ba98 100644
--- a/dist/flexsearch.min.js
+++ b/dist/flexsearch.bundle.js
@@ -1,16 +1,16 @@
 /**!
- * FlexSearch.js v0.7.0-beta
+ * FlexSearch.js v0.7.0-beta (Bundle)
  * Copyright 2019 Nextapps GmbH
  * Author: Thomas Wilkerling
  * Licence: Apache-2.0
  * https://github.com/nextapps-de/flexsearch
  */
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index 311fe85..dd31170 100644
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+v.add=function(a,b,c){if(D(a)){a=b=a;var e=this.key;if(C(e))a=a[e];else for(let d=0;a&&d<e.length;d++)a=a[e[d]]}if(b&&(a||0===a)){if(this.register[a])return this.update(a,b);for(let d=0,f,g;d<this.g.length;d++)g=this.g[d],f=this.D[d],C(f)&&(f=[f]),W(b,f,this.u,0,this.i[g],a,f[0],c);if(this.store&&!this.o){let d;if(this.h){d=B();for(let f=0,g;f<this.h.length;f++)g=this.h[f],C(g)?d[g]=b[g]:V(b,d,g,0,g[0])}this.store[a]=d||b}}return this};v.append=function(a,b){return this.add(a,b,!0)};
+v.update=function(a,b){return this.remove(a).add(a,b)};v.remove=function(a){D(a)&&(a=a[this.key]);if(this.register[a]){for(let b=0;b<this.g.length&&(this.i[this.g[b]].remove(a,!0),!this.s||this.F);b++);this.store&&!this.o&&delete this.store[a];delete this.register[a]}return this};
+v.search=function(a,b,c,e){D(a)?(c=a,a=c.query):D(b)&&(c=b,b=0);let d=[],f=[],g,h,k,l,n,q,r,u=0;if(c)if(c.constructor===Array)k=c,c=null;else if(k=(g=c.pluck)||c.field||c.doc,n=!1,h=this.store&&c.enrich,q="and"===c.bool,b=c.limit||100,r=c.offset||0,k&&(C(k)?k=[k]:k.constructor!==Array&&(l=k,k=Object.keys(k))),n&&(C(n)&&(n=[n]),!a)){for(let m=0,t;m<n.length;m++)if(t=ka.call(this,n[m],b,r,h))d[d.length]=t,u++;return u?d:[]}k||(k=this.g);q=q&&(1<k.length||n&&1<n.length);const p=!e&&(this.F||this.async)&&
+[];for(let m=0,t,w,E;m<k.length;m++){let I;w=k[m];C(w)?l&&(I=l[w]):(I=w,w=w.field);if(p)p[m]=this.i[w].searchAsync(a,b,I||c);else{e?t=e[m]:t=this.i[w].search(a,b,I||c);E=t.length;if(n&&E){const F=[];let ca=0;q&&(F[0]=[t]);for(let P=0,da,J;P<n.length;P++)if(da=n[P],E=(J=this.G[da])&&J.length)ca++,F[F.length]=q?[J]:J;ca&&(t=q?N(F,b||100,r||0):fa(t,F),E=t.length)}if(E)f[u]=w,d[u++]=t;else if(q)return[]}}if(p){const m=this;return new Promise(function(t){Promise.all(p).then(function(w){t(m.search(a,b,
+c,w))})})}if(!u)return[];if(g&&(!h||!this.store))return d[0];for(let m=0,t;m<f.length;m++){t=d[m];t.length&&h&&(t=la.call(this,t));if(g)return t;d[m]={field:f[m],result:t}}return d};function ka(a,b,c,e){let d=this.G[a],f=d&&d.length-c;if(f&&0<f){if(f>b||c)d=d.slice(c,c+b);e&&(d=la.call(this,d));return{tag:a,result:d}}}function la(a){const b=Array(a.length);for(let c=0,e;c<a.length;c++)e=a[c],b[c]={key:e,doc:this.store[e]};return b}v.contain=function(a){return!!this.register[a]};v.get=function(a){return this.store[a]};
+v.set=function(a,b){this.store[a]=b;return this};L(T.prototype);const X=self;let Y;const Z={Index:O,Document:T,Worker:null,registerCharset:function(a,b){K[a]=b},registerLanguage:function(a,b){H[a]=b}};(Y=X.define)&&Y.amd?Y([],function(){return Z}):X.exports?X.exports=Z:X.FlexSearch=Z;}(this));
diff --git a/dist/flexsearch.debug.js b/dist/flexsearch.debug.js
new file mode 100644
index 0000000..2bcc510
--- /dev/null
+++ b/dist/flexsearch.debug.js
@@ -0,0 +1,914 @@
+/**!
+ * FlexSearch.js v0.7.0-beta (Debug)
+ * Copyright 2019 Nextapps GmbH
+ * Author: Thomas Wilkerling
+ * Licence: Apache-2.0
+ * https://github.com/nextapps-de/flexsearch
+ */
+(function(self){'use strict';
+const aa = /[\W_]+/;
+function ba(a) {
+  return this.pipeline(a.toLowerCase(), !1, aa, !1);
+}
+;function v(a, b) {
+  return "undefined" !== typeof a ? a : b;
+}
+function x(a) {
+  const b = Array(a);
+  for (let c = 0; c < a; c++) {
+    b[c] = y();
+  }
+  return b;
+}
+function y() {
+  return Object.create(null);
+}
+function ca(a, b) {
+  return b.length - a.length;
+}
+function z(a) {
+  return "string" === typeof a;
+}
+function A(a) {
+  return "object" === typeof a;
+}
+function B(a) {
+  return "function" === typeof a;
+}
+;function C(a, b) {
+  const c = Object.keys(a), d = c.length, e = [];
+  let f = "", g = 0;
+  for (let k = 0, h, l; k < d; k++) {
+    h = c[k], (l = a[h]) ? (e[g++] = new RegExp(b ? "(?!\\b)" + h + "(\\b|_)" : h, "g"), e[g++] = l) : f += (f ? "|" : "") + h;
+  }
+  f && (e[g++] = new RegExp(b ? "(?!\\b)(" + f + ")(\\b|_)" : "(" + f + ")", "g"), e[g] = "");
+  return e;
+}
+function D(a, b) {
+  for (let c = 0, d = b.length; c < d && (a = a.replace(b[c], b[c + 1]), a); c += 2) {
+  }
+  return a;
+}
+;const G = {}, H = {};
+let I = Promise;
+function J(a) {
+  M(a, "add");
+  M(a, "append");
+  M(a, "search");
+  M(a, "update");
+  M(a, "remove");
+}
+function M(a, b) {
+  a[b + "Async"] = function() {
+    const c = this, d = arguments;
+    var e = d[d.length - 1];
+    let f;
+    B(e) && (f = e, delete d[d.length - 1]);
+    e = new I(function(g) {
+      setTimeout(function() {
+        c.async = !0;
+        g(c[b].apply(c, d));
+        c.async = !1;
+      });
+    });
+    return f ? (e.then(f), this) : e;
+  };
+}
+;function da(a, b, c, d) {
+  var e = a.length;
+  let f = [], g, k = 0;
+  d && (d = []);
+  for (--e; 0 <= e; e--) {
+    const h = a[e], l = h.length, n = y();
+    let q = !g;
+    for (let r = 0; r < l; r++) {
+      const p = h[r], t = p.length;
+      if (t) {
+        for (let m = 0, u = 0, w; m < t; m++) {
+          if (w = p[m], !g) {
+            n[w] = 1;
+          } else {
+            if (g[w]) {
+              if (e) {
+                d && u < b && ((d[r] || (d[r] = []))[u++] = w), n[w] = 1;
+              } else {
+                if (c) {
+                  c--;
+                } else {
+                  if (f[k++] = w, k === b) {
+                    return f;
+                  }
+                }
+              }
+              q = !0;
+            }
+          }
+        }
+      }
+    }
+    if (!q && !d) {
+      return [];
+    }
+    g = n;
+  }
+  if (d) {
+    for (let h = d.length - 1, l, n; 0 <= h; h--) {
+      if ((n = (l = d[h]) && l.length) && c && (n <= c ? (c -= n, n = 0) : n -= c), n) {
+        if (k + n >= b) {
+          return f.concat(l.slice(c, b - k + c));
+        }
+        f = f.concat(c ? l.slice(c) : l);
+        k += n;
+        c = 0;
+      }
+    }
+  }
+  return f;
+}
+function ea(a, b) {
+  const c = y(), d = y(), e = [];
+  for (let f = 0; f < a.length; f++) {
+    c[a[f]] = 1;
+  }
+  for (let f = 0, g; f < b.length; f++) {
+    g = b[f];
+    for (let k = 0, h; k < g.length; k++) {
+      h = g[k], c[h] && !d[h] && (d[h] = 1, e[e.length] = h);
+    }
+  }
+  return e;
+}
+;function N(a) {
+  this.limit = !0 !== a && a;
+  this.cache = y();
+  this.queue = [];
+}
+function fa(a, b, c) {
+  A(a) && (a = a.query);
+  let d = this.cache.get(a);
+  d || (d = this.search(a, b, c), this.cache.set(a, d));
+  return d;
+}
+N.prototype.set = function(a, b) {
+  if (!this.cache[a]) {
+    var c = this.queue.length;
+    c === this.limit ? delete this.cache[this.queue[c - 1]] : c++;
+    for (--c; 0 < c; c--) {
+      this.queue[c] = this.queue[c - 1];
+    }
+    this.queue[0] = a;
+  }
+  this.cache[a] = b;
+};
+N.prototype.get = function(a) {
+  const b = this.cache[a];
+  if (this.limit && b && (a = this.queue.indexOf(a))) {
+    const c = this.queue[a - 1];
+    this.queue[a - 1] = this.queue[a];
+    this.queue[a] = c;
+  }
+  return b;
+};
+N.prototype.del = function(a) {
+  for (let b = 0, c, d; b < this.queue.length; b++) {
+    d = this.queue[b], c = this.cache[d], -1 !== c.indexOf(a) && (this.queue.splice(b--, 1), delete this.cache[d]);
+  }
+};
+const ha = {memory:{charset:"latin:extra", resolution:3, minlength:3, fastupdate:!1, optimize:"memory"}, performance:{threshold:8, minlength:3, context:{depth:1, bidirectional:!0}}, match:{charset:"latin:extra", tokenize:"full", resolution:3, }, score:{charset:"latin:advanced", threshold:1, context:{depth:3, bidirectional:!0}}, "default":{resolution:3, threshold:0, depth:3}, };
+function ka(a, b, c, d, e, f) {
+  setTimeout(function() {
+    const g = a(c, JSON.stringify(f));
+    g && g.then ? g.then(function() {
+      b.export(a, b, c, d, e + 1);
+    }) : b.export(a, b, c, d, e + 1);
+  });
+}
+;function O(a, b) {
+  if (!(this instanceof O)) {
+    return new O(a);
+  }
+  var c;
+  if (a) {
+    if (z(a)) {
+      ha[a] || console.warn("Preset not found: " + a), a = ha[a];
+    } else {
+      if (c = a.preset) {
+        c[c] || console.warn("Preset not found: " + c), a = Object.assign({}, c[c], a);
+      }
+    }
+    c = a.charset;
+    var d = a.lang;
+    z(c) && (-1 === c.indexOf(":") && (c += ":default"), c = H[c]);
+    z(d) && (d = G[d]);
+  } else {
+    a = {};
+  }
+  let e, f, g, k = a.context || {};
+  this.encode = a.encode || c && c.encode || ba;
+  this.register = b || y();
+  e = a.resolution || 9;
+  f = a.threshold || 0;
+  f >= e && (f = e - 1);
+  this.resolution = e;
+  this.threshold = f;
+  this.tokenizer = b = c && c.tokenize || a.tokenize || "strict";
+  this.depth = "strict" === b && k.depth;
+  this.bidirectional = v(k.bidirectional, !0);
+  this.optimize = g = "memory" === a.optimize;
+  this.fastupdate = v(a.fastupdate, !0);
+  this.minlength = a.minlength || 1;
+  this.map = g ? x(e - f) : y();
+  e = k.resolution || e;
+  f = k.threshold || f;
+  f >= e && (f = e - 1);
+  this.resolution_ctx = e;
+  this.threshold_ctx = f;
+  this.ctx = g ? x(e - f) : y();
+  this.rtl = c && c.rtl || a.rtl;
+  this.matcher = (b = a.matcher || d && d.matcher) && C(b, !1);
+  this.stemmer = (b = a.stemmer || d && d.stemmer) && C(b, !0);
+  if (c = b = a.filter || d && d.filter) {
+    c = b;
+    d = y();
+    for (let h = 0, l = c.length; h < l; h++) {
+      d[c[h]] = 1;
+    }
+    c = d;
+  }
+  this.filter = c;
+  this.cache = (b = a.cache) && new N(b);
+}
+O.prototype.pipeline = function(a, b, c, d) {
+  if (a) {
+    b && a && (a = D(a, b));
+    a && this.matcher && (a = D(a, this.matcher));
+    this.stemmer && 1 < a.length && (a = D(a, this.stemmer));
+    if (d && 1 < a.length) {
+      d = b = "";
+      for (let e = 0, f = a.length, g; e < f; e++) {
+        (g = a[e]) !== d && (b += d = g);
+      }
+      a = b;
+    }
+    if (a && (c || "" === c)) {
+      a = a.split(c);
+      if (this.filter) {
+        c = this.filter;
+        b = a.length;
+        d = [];
+        for (let e = 0, f = 0; e < b; e++) {
+          const g = a[e];
+          g && !c[g] && (d[f++] = g);
+        }
+        a = d;
+      }
+      return a;
+    }
+  }
+  return a;
+};
+O.prototype.append = function(a, b) {
+  return this.add(a, b, !0);
+};
+O.prototype.add = function(a, b, c) {
+  if (this.register[a] && !c) {
+    return this.update(a, b);
+  }
+  if (b && (a || 0 === a)) {
+    b = this.encode(b);
+    const l = b.length;
+    if (l) {
+      const n = this.depth, q = this.resolution - this.threshold, r = y(), p = y();
+      for (let t = 0; t < l; t++) {
+        let m = b[this.rtl ? l - 1 - t : t];
+        var d = m.length;
+        if (m && d >= this.minlength && (n || !r[m])) {
+          var e = Math.min(this.resolution / l * t | 0, t);
+          if (e < q) {
+            var f = "";
+            switch(this.tokenizer) {
+              case "full":
+                if (3 < d) {
+                  for (var g = 0; g < d; g++) {
+                    var k = g ? Math.min(e / 2 + this.resolution / d * g / 2 | 0, e + g) : e;
+                    if (k < q) {
+                      for (var h = d; h > g; h--) {
+                        f = m.substring(g, h), f.length >= this.minlength && this.push_index(r, f, k, a, c);
+                      }
+                    }
+                  }
+                  break;
+                }
+              case "reverse":
+                if (2 < d) {
+                  for (g = d - 1; 0 < g; g--) {
+                    f = m[g] + f, f.length >= this.minlength && this.push_index(r, f, e, a, c);
+                  }
+                  f = "";
+                }
+              case "forward":
+                if (1 < d) {
+                  for (g = 0; g < d; g++) {
+                    f += m[g], f.length >= this.minlength && this.push_index(r, f, e, a, c);
+                  }
+                }
+                break;
+              default:
+                if (this.push_index(r, m, e, a, c), n && 1 < l && t < l - 1) {
+                  for (d = this.resolution_ctx - this.threshold_ctx, e = y(), f = m, g = Math.min(n + 1, l - t), e[f] = 1, k = 1; k < g; k++) {
+                    if ((m = b[this.rtl ? l - 1 - t - k : t + k]) && m.length >= this.minlength && !e[m]) {
+                      if (e[m] = 1, h = Math.min((this.resolution_ctx - g) / l * t + k | 0, t + (k - 1)), h < d) {
+                        const u = this.bidirectional && m > f;
+                        this.push_index(p, u ? f : m, h, a, c, u ? m : f);
+                      }
+                    } else {
+                      g = Math.min(g + 1, l - t);
+                    }
+                  }
+                }
+            }
+          }
+        }
+      }
+      this.fastupdate || (this.register[a] = 1);
+    }
+  }
+  return this;
+};
+O.prototype.push_index = function(a, b, c, d, e, f) {
+  let g = f ? this.ctx : this.map;
+  if (!a[b] || f && !a[b][f]) {
+    this.optimize && (g = g[c]), f ? (a = a[b] || (a[b] = y()), a[f] = 1, g = g[f] || (g[f] = y())) : a[b] = 1, g = g[b] || (g[b] = []), this.optimize || (g = g[c] || (g[c] = [])), e && -1 !== g.indexOf(d) || (g[g.length] = d, this.fastupdate && (a = this.register[d] || (this.register[d] = []), a[a.length] = g));
+  }
+};
+O.prototype.search = function(a, b, c) {
+  A(a) ? (c = a, a = c.query) : A(b) && (c = b);
+  let d = [], e;
+  var f = this.threshold;
+  let g, k = 0;
+  if (c) {
+    b = c.limit;
+    k = c.offset || 0;
+    f = v(c.threshold, f);
+    var h = c.context;
+    g = c.suggest;
+  }
+  if (a && (a = this.encode(a), e = a.length, 1 < e)) {
+    c = y();
+    var l = [];
+    for (let q = 0, r = 0, p; q < e; q++) {
+      if ((p = a[q]) && p.length >= this.minlength && !c[p]) {
+        if (this.optimize || g || this.map[p]) {
+          l[r++] = p, c[p] = 1;
+        } else {
+          return d;
+        }
+      }
+    }
+    a = l;
+    e = a.length;
+  }
+  if (!e) {
+    return d;
+  }
+  b || (b = 100);
+  c = this.resolution - f;
+  f = this.resolution_ctx - f;
+  h = this.depth && 1 < e && !1 !== h;
+  l = 0;
+  let n;
+  h ? (n = a[0], l = 1) : 1 < e && a.sort(ca);
+  for (let q, r; l < e; l++) {
+    r = a[l];
+    h ? (q = this.add_result(d, g, f, b, k, 2 === e, r, n), g && !1 === q && d.length || (n = r)) : q = this.add_result(d, g, c, b, k, 1 === e, r);
+    if (q) {
+      return q;
+    }
+    if (g && l === e - 1) {
+      let p = d.length;
+      if (!p) {
+        if (h) {
+          h = 0;
+          l = -1;
+          continue;
+        }
+        return d;
+      }
+      if (1 === p) {
+        return la(d[0], b, k);
+      }
+    }
+  }
+  return da(d, b, k, g);
+};
+O.prototype.add_result = function(a, b, c, d, e, f, g, k) {
+  let h = [], l = k ? this.ctx : this.map;
+  this.optimize || (l = ma(l, g, k, this.bidirectional));
+  if (l) {
+    let n = 0;
+    c = Math.min(l.length, c);
+    for (let q = 0, r = 0, p, t; q < c && !(p = l[q], this.optimize && (p = ma(p, g, k, this.bidirectional)), p && f && (t = p.length, t <= e ? (e -= t, p = null) : e && (p = p.slice(e), e = 0)), p && (h[n++] = p, f && (r += p.length, r >= d))); q++) {
+    }
+    if (n) {
+      if (f) {
+        return la(h, d, 0);
+      }
+      a[a.length] = h;
+      return;
+    }
+  }
+  return !b && h;
+};
+function la(a, b, c) {
+  a = 1 === a.length ? a[0] : [].concat.apply([], a);
+  return c || a.length > b ? a.slice(c, c + b) : a;
+}
+function ma(a, b, c, d) {
+  c ? (d = d && b > c, a = (a = a[d ? b : c]) && a[d ? c : b]) : a = a[b];
+  return a;
+}
+O.prototype.contain = function(a) {
+  return !!this.register[a];
+};
+O.prototype.update = function(a, b) {
+  return this.remove(a).add(a, b);
+};
+O.prototype.remove = function(a, b) {
+  const c = this.register[a];
+  if (c) {
+    if (this.fastupdate) {
+      for (let d = 0, e; d < c.length; d++) {
+        e = c[d], e.splice(e.indexOf(a), 1);
+      }
+    } else {
+      P(this.map, a, this.resolution - this.threshold, this.optimize), this.depth && P(this.ctx, a, this.resolution_ctx - this.threshold_ctx, this.optimize);
+    }
+    b || delete this.register[a];
+    this.cache && this.cache.del(a);
+  }
+  return this;
+};
+function P(a, b, c, d, e) {
+  let f = 0;
+  if (a.constructor === Array) {
+    if (e) {
+      b = a.indexOf(b), -1 !== b ? 1 < a.length && (a.splice(b, 1), f++) : f++;
+    } else {
+      e = Math.min(a.length, c);
+      for (let g = 0, k; g < e; g++) {
+        if (k = a[g]) {
+          f = P(k, b, c, d, e), d || f || delete a[g];
+        }
+      }
+    }
+  } else {
+    for (let g in a) {
+      (f = P(a[g], b, c, d, e)) || delete a[g];
+    }
+  }
+  return f;
+}
+O.prototype.searchCache = fa;
+O.prototype.export = function(a, b, c, d, e) {
+  let f, g;
+  switch(e || (e = 0)) {
+    case 0:
+      f = "reg";
+      if (this.fastupdate) {
+        g = y();
+        for (let k in this.register) {
+          g[k] = 1;
+        }
+      } else {
+        g = this.register;
+      }
+      break;
+    case 1:
+      f = "cfg";
+      g = {doc:0, opt:this.optimize ? 1 : 0};
+      break;
+    case 2:
+      f = "map";
+      g = this.map;
+      break;
+    case 3:
+      f = "ctx";
+      g = this.ctx;
+      break;
+    default:
+      return;
+  }
+  ka(a, b || this, c ? c + "." + f : f, d, e, g);
+  return !0;
+};
+O.prototype.import = function(a, b) {
+  if (b) {
+    switch(z(b) && (b = JSON.parse(b)), a) {
+      case "cfg":
+        this.optimize = !!b.opt;
+        break;
+      case "reg":
+        this.fastupdate = !1;
+        this.register = b;
+        break;
+      case "map":
+        this.map = b;
+        break;
+      case "ctx":
+        this.ctx = b;
+    }
+  }
+};
+J(O.prototype);
+function na(a) {
+  var b = self._index;
+  a = a.data;
+  var c = a.args;
+  const d = a.task;
+  switch(d) {
+    case "init":
+      b = a.options || {};
+      a = a.factory;
+      c = b.encode;
+      b.cache = !1;
+      c && 0 === c.indexOf("function") && (b.encode = Function("return " + c)());
+      a ? (Function("return " + a)()(self), self._index = new self.FlexSearch.Index(b), delete self.FlexSearch) : self._index = new O(b);
+      break;
+    case "search":
+      b = b.search.apply(b, c);
+      postMessage(b);
+      break;
+    default:
+      b[d].apply(b, c);
+  }
+}
+;function Q(a, b) {
+  var c;
+  A(a) ? b = a : b ? B(c = b.encode) && (b.encode = c.toString()) : b = {};
+  (a = (self || window)._factory) && (a = a.toString());
+  c = self.exports;
+  if (this.worker = oa(a, c)) {
+    this.resolver = null;
+    var d = this;
+    if (c) {
+      this.worker.on("message", function(e) {
+        d.resolver(e);
+      });
+    } else {
+      this.worker.onmessage = function(e) {
+        d.resolver(e.data);
+      };
+    }
+    this.worker.postMessage({task:"init", factory:a, options:b});
+  }
+}
+S("add");
+S("append");
+S("search");
+S("update");
+S("remove");
+function S(a) {
+  Q.prototype[a] = Q.prototype[a + "Async"] = function() {
+    const b = this, c = [].slice.call(arguments);
+    var d = c[c.length - 1];
+    let e;
+    B(d) && (e = d, c.splice(c.length - 1, 1));
+    d = new I(function(f) {
+      setTimeout(function() {
+        b.worker.postMessage({task:a, args:c});
+        "search" === a ? b.resolver = f : f();
+      });
+    });
+    return e ? (d.then(e), this) : d;
+  };
+}
+function oa(a, b) {
+  let c;
+  try {
+    c = b ? eval('new (require("worker_threads")["Worker"])("../dist/node/node.js")') : a ? new Worker(URL.createObjectURL(new Blob(["onmessage=" + na.toString()], {type:"text/javascript"}))) : new Worker("worker.js", {type:"module"});
+  } catch (d) {
+  }
+  return c;
+}
+;function T(a) {
+  if (!(this instanceof T)) {
+    return new T(a);
+  }
+  var b;
+  a || (a = {});
+  this.tree = [];
+  this.field = [];
+  this.marker = [];
+  this.register = y();
+  this.key = (b = a.key) && U(b, this.marker) || "id";
+  this.fastupdate = v(a.fastupdate, !0);
+  this.extern = !!(b = a.extern);
+  this.storetree = !this.extern && (b = a.store) && !0 !== b && [];
+  this.store = b && (this.extern ? b : y());
+  this.tag = (b = a.tag) && U(b, this.marker);
+  this.tagindex = b && y();
+  this.cache = (b = a.cache) && new N(b);
+  a.cache = !1;
+  this.worker = a.worker;
+  this.async = !1;
+  b = a;
+  a = y();
+  let c = b.doc;
+  if (z(c)) {
+    c = [c];
+  } else {
+    if (c.constructor !== Array) {
+      var d = c;
+      c = Object.keys(c);
+    }
+  }
+  for (let e = 0, f, g; e < c.length; e++) {
+    f = c[e], z(f) ? d && (g = d[f]) : (g = f, f = f.field), g = A(g) ? Object.assign({}, b, g) : b, this.worker && (a[f] = new Q(g), a[f].worker || (this.worker = !1)), this.worker || (a[f] = new O(g, this.register)), this.tree[e] = U(f, this.marker), this.field[e] = f;
+  }
+  if (this.storetree) {
+    for (d = b.store, z(d) && (d = [d]), b = 0; b < d.length; b++) {
+      this.storetree[b] = U(d[b], this.marker);
+    }
+  }
+  this.index = a;
+}
+function U(a, b) {
+  const c = a.split(":");
+  let d = 0;
+  for (let e = 0; e < c.length; e++) {
+    a = c[e], 0 <= a.indexOf("[]") && (a = a.substring(0, a.length - 2)) && (b[d] = !0), a && (c[d++] = a);
+  }
+  d < c.length && (c.length = d);
+  return 1 < d ? c : c[0];
+}
+function pa(a, b) {
+  if (z(b)) {
+    a = a[b];
+  } else {
+    for (let c = 0; a && c < b.length; c++) {
+      a = a[b[c]];
+    }
+  }
+  return a;
+}
+function V(a, b, c, d, e) {
+  a = a[e];
+  if (d === c.length - 1) {
+    b[e] = a;
+  } else {
+    if (a) {
+      if (a.constructor === Array) {
+        for (b = b[e] = Array(a.length), e = 0; e < a.length; e++) {
+          V(a, b, c, d, e);
+        }
+      } else {
+        b = b[e] || (b[e] = y()), e = c[++d], V(a, b, c, d, e);
+      }
+    }
+  }
+}
+function W(a, b, c, d, e, f, g, k) {
+  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);
+        }
+        return;
+      }
+      a = a.join(" ");
+    }
+    e.add(f, a, k);
+  } else {
+    if (a) {
+      if (a.constructor === Array) {
+        for (g = 0; g < a.length; g++) {
+          W(a, b, c, d, e, f, g, k);
+        }
+      } else {
+        g = b[++d], W(a, b, c, d, e, f, g, k);
+      }
+    }
+  }
+}
+T.prototype.add = function(a, b, c) {
+  A(a) && (b = a, a = pa(b, this.key));
+  if (b && (a || 0 === a)) {
+    if (this.register[a]) {
+      return this.update(a, b);
+    }
+    for (let d = 0, e, f; d < this.field.length; d++) {
+      f = this.field[d], e = this.tree[d], z(e) && (e = [e]), W(b, e, this.marker, 0, this.index[f], a, e[0], c);
+    }
+    if (this.tag) {
+      let d = pa(b, this.tag), e = y();
+      z(d) && (d = [d]);
+      for (let f = 0, g, k; f < d.length; f++) {
+        if (g = d[f], !e[g] && (e[g] = 1, k = this.tagindex[g] || (this.tagindex[g] = []), !c || -1 === k.indexOf(a))) {
+          if (k[k.length] = a, this.fastupdate) {
+            const h = this.register[a] || (this.register[a] = []);
+            h[h.length] = k;
+          }
+        }
+      }
+    }
+    if (this.store && !this.extern) {
+      let d;
+      if (this.storetree) {
+        d = y();
+        for (let e = 0, f; e < this.storetree.length; e++) {
+          f = this.storetree[e], z(f) ? d[f] = b[f] : V(b, d, f, 0, f[0]);
+        }
+      }
+      this.store[a] = d || b;
+    }
+  }
+  return this;
+};
+T.prototype.append = function(a, b) {
+  return this.add(a, b, !0);
+};
+T.prototype.update = function(a, b) {
+  return this.remove(a).add(a, b);
+};
+T.prototype.remove = function(a) {
+  A(a) && (a = a[this.key]);
+  if (this.register[a]) {
+    for (var b = 0; b < this.field.length && (this.index[this.field[b]].remove(a, !0), !this.fastupdate || this.worker); b++) {
+    }
+    if (this.tag && (!this.fastupdate || this.worker)) {
+      for (let c in this.tagindex) {
+        b = this.tagindex[c];
+        const d = b.indexOf(a);
+        -1 !== d && (1 < b.length ? b.splice(d, 1) : delete this.tagindex[c]);
+      }
+    }
+    this.store && !this.extern && delete this.store[a];
+    delete this.register[a];
+  }
+  return this;
+};
+T.prototype.search = function(a, b, c, d) {
+  A(a) ? (c = a, a = c.query) : A(b) && (c = b, b = 0);
+  let e = [], f = [], g, k, h, l, n, q, r, p = 0;
+  if (c) {
+    if (c.constructor === Array) {
+      h = c, c = null;
+    } else {
+      if (h = (g = c.pluck) || c.field || c.doc, n = c.tag, k = this.store && c.enrich, q = "and" === c.bool, b = c.limit || 100, r = c.offset || 0, h && (z(h) ? h = [h] : h.constructor !== Array && (l = h, h = Object.keys(h))), n && (z(n) && (n = [n]), !a)) {
+        for (let m = 0, u; m < n.length; m++) {
+          if (u = qa.call(this, n[m], b, r, k)) {
+            e[e.length] = u, p++;
+          }
+        }
+        return p ? e : [];
+      }
+    }
+  }
+  h || (h = this.field);
+  q = q && (1 < h.length || n && 1 < n.length);
+  const t = !d && (this.worker || this.async) && [];
+  for (let m = 0, u, w, E; m < h.length; m++) {
+    let K;
+    w = h[m];
+    z(w) ? l && (K = l[w]) : (K = w, w = w.field);
+    if (t) {
+      t[m] = this.index[w].searchAsync(a, b, K || c);
+    } else {
+      u = d ? d[m] : this.index[w].search(a, b, K || c);
+      E = u.length;
+      if (n && E) {
+        const F = [];
+        let ia = 0;
+        q && (F[0] = [u]);
+        for (let R = 0, ja, L; R < n.length; R++) {
+          if (ja = n[R], E = (L = this.tagindex[ja]) && L.length) {
+            ia++, F[F.length] = q ? [L] : L;
+          }
+        }
+        ia && (u = q ? da(F, b || 100, r || 0) : ea(u, F), E = u.length);
+      }
+      if (E) {
+        f[p] = w, e[p++] = u;
+      } else {
+        if (q) {
+          return [];
+        }
+      }
+    }
+  }
+  if (t) {
+    const m = this;
+    return new Promise(function(u) {
+      Promise.all(t).then(function(w) {
+        u(m.search(a, b, c, w));
+      });
+    });
+  }
+  if (!p) {
+    return [];
+  }
+  if (g && (!k || !this.store)) {
+    return e[0];
+  }
+  for (let m = 0, u; m < f.length; m++) {
+    u = e[m];
+    u.length && k && (u = ra.call(this, u));
+    if (g) {
+      return u;
+    }
+    e[m] = {field:f[m], result:u};
+  }
+  return e;
+};
+function qa(a, b, c, d) {
+  let e = this.tagindex[a], f = e && e.length - c;
+  if (f && 0 < f) {
+    if (f > b || c) {
+      e = e.slice(c, c + b);
+    }
+    d && (e = ra.call(this, e));
+    return {tag:a, result:e};
+  }
+}
+function ra(a) {
+  const b = Array(a.length);
+  for (let c = 0, d; c < a.length; c++) {
+    d = a[c], b[c] = {key:d, doc:this.store[d]};
+  }
+  return b;
+}
+T.prototype.contain = function(a) {
+  return !!this.register[a];
+};
+T.prototype.get = function(a) {
+  return this.store[a];
+};
+T.prototype.set = function(a, b) {
+  this.store[a] = b;
+  return this;
+};
+T.prototype.searchCache = fa;
+T.prototype.export = function(a, b, c, d, e) {
+  e || (e = 0);
+  d || (d = 0);
+  if (d < this.field.length) {
+    const f = this.field[d], g = this.index[f];
+    b = this;
+    setTimeout(function() {
+      g.export(a, b, e ? f.replace(":", "-") : "", d, e++) || (d++, e = 1, b.export(a, b, f, d, e));
+    });
+  } else {
+    let f;
+    switch(e) {
+      case 1:
+        c = "tag";
+        f = this.tagindex;
+        break;
+      case 2:
+        c = "store";
+        f = this.store;
+        break;
+      default:
+        return;
+    }
+    ka(a, this, c, d, e, f);
+  }
+};
+T.prototype.import = function(a, b) {
+  if (b) {
+    switch(z(b) && (b = JSON.parse(b)), a) {
+      case "tag":
+        this.tagindex = b;
+        break;
+      case "reg":
+        this.fastupdate = !1;
+        this.register = b;
+        for (let d = 0, e; d < this.field.length; d++) {
+          e = this.index[this.field[d]], e.register = b, e.fastupdate = !1;
+        }
+        break;
+      case "store":
+        this.store = b;
+        break;
+      default:
+        a = a.split(".");
+        const c = a[0];
+        a = a[1];
+        c && a && this.index[c].import(a, b);
+    }
+  }
+};
+J(T.prototype);
+const X = self;
+let Y;
+const Z = {Index:O, Document:T, Worker:Q, registerCharset:function(a, b) {
+  H[a] = b;
+}, registerLanguage:function(a, b) {
+  G[a] = b;
+}};
+(Y = X.define) && Y.amd ? Y([], function() {
+  return Z;
+}) : X.exports ? X.exports = Z : X.FlexSearch = Z;
+}(this));
diff --git a/dist/flexsearch.es5.js b/dist/flexsearch.es5.js
new file mode 100644
index 0000000..f537b05
--- /dev/null
+++ b/dist/flexsearch.es5.js
@@ -0,0 +1,44 @@
+/**!
+ * FlexSearch.js v0.7.0-beta (ES5)
+ * Copyright 2019 Nextapps GmbH
+ * Author: Thomas Wilkerling
+ * Licence: Apache-2.0
+ * https://github.com/nextapps-de/flexsearch
+ */
+(function(self){'use strict';var u;function v(a){var b=0;return function(){return b<a.length?{done:!1,value:a[b++]}:{done:!0}}}var y="function"==typeof Object.defineProperties?Object.defineProperty:function(a,b,c){if(a==Array.prototype||a==Object.prototype)return a;a[b]=c.value;return a};
+function aa(a){a=["object"==typeof globalThis&&globalThis,a,"object"==typeof window&&window,"object"==typeof self&&self,"object"==typeof global&&global];for(var b=0;b<a.length;++b){var c=a[b];if(c&&c.Math==Math)return c}throw Error("Cannot find global object");}var A=aa(this);function B(a,b){if(b)a:{var c=A;a=a.split(".");for(var d=0;d<a.length-1;d++){var f=a[d];if(!(f in c))break a;c=c[f]}a=a[a.length-1];d=c[a];b=b(d);b!=d&&null!=b&&y(c,a,{configurable:!0,writable:!0,value:b})}}
+B("Symbol",function(a){function b(g){if(this instanceof b)throw new TypeError("Symbol is not a constructor");return new c(d+(g||"")+"_"+f++,g)}function c(g,e){this.g=g;y(this,"description",{configurable:!0,writable:!0,value:e})}if(a)return a;c.prototype.toString=function(){return this.g};var d="jscomp_symbol_"+(1E9*Math.random()>>>0)+"_",f=0;return b});
+B("Symbol.iterator",function(a){if(a)return a;a=Symbol("Symbol.iterator");for(var b="Array Int8Array Uint8Array Uint8ClampedArray Int16Array Uint16Array Int32Array Uint32Array Float32Array Float64Array".split(" "),c=0;c<b.length;c++){var d=A[b[c]];"function"===typeof d&&"function"!=typeof d.prototype[a]&&y(d.prototype,a,{configurable:!0,writable:!0,value:function(){return ba(v(this))}})}return a});function ba(a){a={next:a};a[Symbol.iterator]=function(){return this};return a}
+function ca(a,b){a instanceof String&&(a+="");var c=0,d=!1,f={next:function(){if(!d&&c<a.length){var g=c++;return{value:b(g,a[g]),done:!1}}d=!0;return{done:!0,value:void 0}}};f[Symbol.iterator]=function(){return f};return f}B("Array.prototype.keys",function(a){return a?a:function(){return ca(this,function(b){return b})}});function C(a){var b="undefined"!=typeof Symbol&&Symbol.iterator&&a[Symbol.iterator];return b?b.call(a):{next:v(a)}}
+B("Promise",function(a){function b(e){this.h=0;this.i=void 0;this.g=[];this.B=!1;var h=this.j();try{e(h.resolve,h.reject)}catch(k){h.reject(k)}}function c(){this.g=null}function d(e){return e instanceof b?e:new b(function(h){h(e)})}if(a)return a;c.prototype.h=function(e){if(null==this.g){this.g=[];var h=this;this.i(function(){h.o()})}this.g.push(e)};var f=A.setTimeout;c.prototype.i=function(e){f(e,0)};c.prototype.o=function(){for(;this.g&&this.g.length;){var e=this.g;this.g=[];for(var h=0;h<e.length;++h){var k=
+e[h];e[h]=null;try{k()}catch(l){this.j(l)}}}this.g=null};c.prototype.j=function(e){this.i(function(){throw e;})};b.prototype.j=function(){function e(l){return function(n){k||(k=!0,l.call(h,n))}}var h=this,k=!1;return{resolve:e(this.K),reject:e(this.o)}};b.prototype.K=function(e){if(e===this)this.o(new TypeError("A Promise cannot resolve to itself"));else if(e instanceof b)this.M(e);else{a:switch(typeof e){case "object":var h=null!=e;break a;case "function":h=!0;break a;default:h=!1}h?this.J(e):this.A(e)}};
+b.prototype.J=function(e){var h=void 0;try{h=e.then}catch(k){this.o(k);return}"function"==typeof h?this.N(h,e):this.A(e)};b.prototype.o=function(e){this.D(2,e)};b.prototype.A=function(e){this.D(1,e)};b.prototype.D=function(e,h){if(0!=this.h)throw Error("Cannot settle("+e+", "+h+"): Promise already settled in state"+this.h);this.h=e;this.i=h;2===this.h&&this.L();this.P()};b.prototype.L=function(){var e=this;f(function(){if(e.R()){var h=A.console;"undefined"!==typeof h&&h.error(e.i)}},1)};b.prototype.R=
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diff --git a/dist/flexsearch.light.js b/dist/flexsearch.light.js
index dac0346..7e12d2e 100644
--- a/dist/flexsearch.light.js
+++ b/dist/flexsearch.light.js
@@ -5,13 +5,14 @@
  * Licence: Apache-2.0
  * https://github.com/nextapps-de/flexsearch
  */
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-I.prototype.remove=function(a,c){const d=this.register[a];if(d){if(this.C)for(let b=0,e;b<d.length;b++)e=d[b],e.splice(e.indexOf(a),1);else M(this.j,a,this.i-this.s,this.g),this.m&&M(this.B,a,this.l-this.D,this.g);c||delete this.register[a]}return this};
-function M(a,c,d,b,e){let g=0;if(a.constructor===Array)if(e)c=a.indexOf(c),-1!==c?1<a.length&&(a.splice(c,1),g++):g++;else{e=Math.min(a.length,d);for(let f=0,h;f<e;f++)if(h=a[f])g=M(h,c,d,b,e),b||g||delete a[f]}else for(let f in a)(g=M(a[f],c,d,b,e))||delete a[f];return g};window.FlexSearch={Index:I,Document:null,registerCharset:function(a,c){F[a]=c},registerLanguage:function(a,c){E[a]=c}};}).call(this);
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+function L(a,b,c,d){c?(d=d&&b>c,a=(a=a[d?b:c])&&a[d?c:b]):a=a[b];return a}H.prototype.contain=function(a){return!!this.register[a]};H.prototype.update=function(a,b){return this.remove(a).add(a,b)};H.prototype.remove=function(a,b){const c=this.register[a];if(c){if(this.C)for(let d=0,e;d<c.length;d++)e=c[d],e.splice(e.indexOf(a),1);else M(this.j,a,this.i-this.s,this.g),this.m&&M(this.B,a,this.l-this.D,this.g);b||delete this.register[a]}return this};
+function M(a,b,c,d,e){let g=0;if(a.constructor===Array)if(e)b=a.indexOf(b),-1!==b?1<a.length&&(a.splice(b,1),g++):g++;else{e=Math.min(a.length,c);for(let f=0,h;f<e;f++)if(h=a[f])g=M(h,b,c,d,e),d||g||delete a[f]}else for(let f in a)(g=M(a[f],b,c,d,e))||delete a[f];return g};const N=self;let O;const P={Index:H,Document:null,Worker:null,registerCharset:function(a,b){F[a]=b},registerLanguage:function(a,b){E[a]=b}};(O=N.define)&&O.amd?O([],function(){return P}):N.exports?N.exports=P:N.FlexSearch=P;}(this));
diff --git a/package.json b/package.json
index f69ff1f..6130f23 100644
--- a/package.json
+++ b/package.json
@@ -17,36 +17,36 @@
     "url": "https://github.com/nextapps-de/flexsearch/issues",
     "email": "info@nextapps.de"
   },
-  "main": "dist/flexsearch.min.js",
-  "browser": "dist/flexsearch.min.js",
-  "types": "index.d.ts",
+  "main": "dist/flexsearch.bundle.js",
+  "browser": "dist/flexsearch.bundle.js",
   "preferGlobal": false,
   "repository": {
     "type": "git",
     "url": "https://github.com/nextapps-de/flexsearch.git"
   },
   "scripts": {
-    "build": "node task/build RELEASE=min DEBUG=false PROFILER=false POLYFILL=true SUPPORT_WORKER=true SUPPORT_ENCODER=true SUPPORT_LANG=false SUPPORT_CACHE=true SUPPORT_ASYNC=true SUPPORT_PRESET=true SUPPORT_SUGGESTION=true SUPPORT_SERIALIZE=true SUPPORT_INFO=true SUPPORT_DOCUMENT=true SUPPORT_OPERATOR=true SUPPORT_WHERE=true SUPPORT_PAGINATION=true",
-    "build:debug": "node task/build RELEASE=debug DEBUG=true PROFILER=false POLYFILL=true SUPPORT_WORKER=true SUPPORT_ENCODER=true SUPPORT_LANG=true SUPPORT_CACHE=true SUPPORT_ASYNC=true SUPPORT_PRESET=true SUPPORT_SUGGESTION=true SUPPORT_SERIALIZE=true SUPPORT_INFO=true SUPPORT_DOCUMENT=true SUPPORT_OPERATOR=true SUPPORT_WHERE=true SUPPORT_PAGINATION=true",
-    "build:compact": "node task/build RELEASE=compact DEBUG=false PROFILER=false POLYFILL=true SUPPORT_WORKER=false SUPPORT_ENCODER=true SUPPORT_LANG=false SUPPORT_CACHE=false SUPPORT_ASYNC=true SUPPORT_PRESET=true SUPPORT_SUGGESTION=false SUPPORT_SERIALIZE=false SUPPORT_INFO=false SUPPORT_DOCUMENT=true SUPPORT_OPERATOR=true SUPPORT_WHERE=false SUPPORT_PAGINATION=false",
-    "build:light": "node task/build RELEASE=light DEBUG=false PROFILER=false POLYFILL=true SUPPORT_WORKER=false SUPPORT_ENCODER=false SUPPORT_LANG=false SUPPORT_CACHE=false SUPPORT_ASYNC=false SUPPORT_PRESET=false SUPPORT_SUGGESTION=false SUPPORT_SERIALIZE=false SUPPORT_INFO=false SUPPORT_DOCUMENT=false SUPPORT_OPERATOR=false SUPPORT_WHERE=false SUPPORT_PAGINATION=false",
-    "build:custom": "node task/build RELEASE=custom DEBUG=false PROFILER=false POLYFILL=false SUPPORT_WORKER=false SUPPORT_ENCODER=false SUPPORT_LANG=false SUPPORT_CACHE=false SUPPORT_ASYNC=false SUPPORT_PRESET=false SUPPORT_SUGGESTION=false SUPPORT_SERIALIZE=false SUPPORT_INFO=false SUPPORT_DOCUMENT=false SUPPORT_OPERATOR=false SUPPORT_WHERE=false SUPPORT_PAGINATION=false",
-    "build:es5": "node task/build RELEASE=es5 DEBUG=true PROFILER=false POLYFILL=true SUPPORT_WORKER=true SUPPORT_ENCODER=true SUPPORT_LANG=false SUPPORT_CACHE=true SUPPORT_ASYNC=true SUPPORT_PRESET=true SUPPORT_SUGGESTION=true SUPPORT_SERIALIZE=true SUPPORT_INFO=true SUPPORT_DOCUMENT=true SUPPORT_OPERATOR=true SUPPORT_WHERE=true SUPPORT_PAGINATION=true LANGUAGE_OUT=ECMASCRIPT5_STRICT",
-    "build:node": "node task/build RELEASE=node DEBUG=false PROFILER=false POLYFILL=false SUPPORT_WORKER=false SUPPORT_ENCODER=true SUPPORT_LANG=false SUPPORT_CACHE=true SUPPORT_ASYNC=true SUPPORT_PRESET=true SUPPORT_SUGGESTION=true SUPPORT_SERIALIZE=true SUPPORT_INFO=true SUPPORT_DOCUMENT=true SUPPORT_OPERATOR=true SUPPORT_WHERE=true SUPPORT_PAGINATION=true",
-    "build:pre": "node task/build RELEASE=pre DEBUG=false PROFILER=false POLYFILL=true SUPPORT_WORKER=false SUPPORT_ENCODER=true SUPPORT_LANG=true SUPPORT_CACHE=true SUPPORT_ASYNC=true SUPPORT_PRESET=true SUPPORT_SUGGESTION=true SUPPORT_SERIALIZE=true SUPPORT_INFO=true SUPPORT_DOCUMENT=true SUPPORT_OPERATOR=true SUPPORT_WHERE=true SUPPORT_PAGINATION=true FORMATTING=PRETTY_PRINT",
+    "copy": "npm run clean && cpx \"src/**\" tmp/",
+    "clean": "if exist tmp rmdir tmp /s /q && mkdir tmp",
+    "build": "npm run copy && npm run build:bundle",
+    "build:bundle": "cpx src/config/bundle/config.js tmp/ && node task/build RELEASE=bundle",
+    "build:debug": "cpx src/config/debug/config.js tmp/ && node task/build RELEASE=debug COMPILATION_LEVEL=SIMPLE FORMATTING=PRETTY_PRINT",
+    "build:compact": "cpx src/config/compact/config.js tmp/ && node task/build RELEASE=compact",
+    "build:light": "cpx src/config/light/config.js tmp/ && node task/build RELEASE=light",
+    "build:custom": "cpx src/config/custom/config.js tmp/ && node task/build RELEASE=custom",
+    "build:es5": "cpx src/config/bundle/config.js tmp/ && node task/build RELEASE=es5 LANGUAGE_OUT=ECMASCRIPT5_STRICT POLYFILL=true",
+    "build:pre": "cpx src/config/bundle/config.js tmp/ && node task/build RELEASE=pre COMPILATION_LEVEL=WHITESPACE FORMATTING=PRETTY_PRINT",
     "build:lang": "node task/build RELEASE=lang POLYFILL=false",
     "build:module": "babel src -d dist/module && exit 0",
-    "build:all": "npm run build && npm run build:light && npm run build:compact && npm run build:es5 && npm run build:node && npm run build:pre && npm run build:debug && npm run build:lang && npm run build:module",
+    "build:all": "npm run build && npm run build:light && npm run build:compact && npm run build:es5 && npm run build:pre && npm run build:debug",
     "test": "npm run build:pre && cd test && npm install && npm run test",
     "update": "npm install google-closure-compiler@nightly"
   },
   "files": [
-    "flexsearch.js",
     "dist/**",
     "src/**",
+    "task/**",
     "test/",
     "index.d.ts",
-    "compile.js",
     "README.md",
     "CHANGELOG.md",
     "LICENSE"
@@ -70,6 +70,7 @@
     "babel-plugin-transform-property-literals": "^6.9.4",
     "babel-plugin-transform-simplify-comparison-operators": "^6.9.4",
     "babel-plugin-transform-undefined-to-void": "^6.9.4",
+    "cpx": "^1.5.0",
     "google-closure-compiler": "^20210505.0.0"
   }
 }
diff --git a/src/config/bundle.js b/src/config/bundle/config.js
similarity index 89%
rename from src/config/bundle.js
rename to src/config/bundle/config.js
index 5d642f2..e55b258 100644
--- a/src/config/bundle.js
+++ b/src/config/bundle/config.js
@@ -1,11 +1,8 @@
-/** @define {string}  */
-export const RELEASE = "browser";
-
 /** @define {boolean} */
 export const DEBUG = false;
 
 /** @define {boolean} */
-export const POLYFILL = true;
+export const POLYFILL = false;
 
 /** @define {boolean} */
 export const SUPPORT_WORKER = true;
diff --git a/src/config/compact.js b/src/config/compact/config.js
similarity index 93%
rename from src/config/compact.js
rename to src/config/compact/config.js
index 1d61270..bd3475f 100644
--- a/src/config/compact.js
+++ b/src/config/compact/config.js
@@ -1,6 +1,3 @@
-/** @define {string}  */
-export const RELEASE = "browser";
-
 /** @define {boolean} */
 export const DEBUG = false;
 
diff --git a/src/config/debug/config.js b/src/config/debug/config.js
new file mode 100644
index 0000000..3713d1a
--- /dev/null
+++ b/src/config/debug/config.js
@@ -0,0 +1,38 @@
+/** @define {boolean} */
+export const DEBUG = true;
+
+/** @define {boolean} */
+export const POLYFILL = false;
+
+/** @define {boolean} */
+export const SUPPORT_WORKER = true;
+
+/** @define {boolean|string} */
+export const SUPPORT_ENCODER = true;
+
+/** @define {boolean|string} */
+export const SUPPORT_LANG = true;
+
+/** @define {boolean} */
+export const SUPPORT_CACHE = true;
+
+/** @define {boolean} */
+export const SUPPORT_ASYNC = true;
+
+/** @define {boolean} */
+export const SUPPORT_PRESET = true;
+
+/** @define {boolean} */
+export const SUPPORT_STORE = true;
+
+/** @define {boolean} */
+export const SUPPORT_TAGS = true;
+
+/** @define {boolean} */
+export const SUPPORT_SUGGESTION = true;
+
+/** @define {boolean} */
+export const SUPPORT_SERIALIZE = true;
+
+/** @define {boolean} */
+export const SUPPORT_DOCUMENT = true;
diff --git a/src/config/light.js b/src/config/light/config.js
similarity index 93%
rename from src/config/light.js
rename to src/config/light/config.js
index 92aa3f7..b2c72db 100644
--- a/src/config/light.js
+++ b/src/config/light/config.js
@@ -1,6 +1,3 @@
-/** @define {string}  */
-export const RELEASE = "browser";
-
 /** @define {boolean} */
 export const DEBUG = false;
 
diff --git a/src/document.js b/src/document.js
index 0872d45..2a29f7c 100644
--- a/src/document.js
+++ b/src/document.js
@@ -126,7 +126,7 @@ function parse_descriptor(options){
 
         opt = is_object(opt) ? Object.assign({}, options, opt) : options;
 
-        if(this.worker){
+        if(SUPPORT_WORKER && this.worker){
 
             index[key] = new WorkerIndex(opt);
 
diff --git a/src/webpack.js b/src/webpack.js
index 9cebcb8..30c3bd8 100644
--- a/src/webpack.js
+++ b/src/webpack.js
@@ -1,4 +1,4 @@
-import { SUPPORT_ASYNC, SUPPORT_DOCUMENT, SUPPORT_CACHE, SUPPORT_SERIALIZE } from "./config.js";
+import { SUPPORT_ASYNC, SUPPORT_DOCUMENT, SUPPORT_CACHE, SUPPORT_SERIALIZE, SUPPORT_WORKER } from "./config.js";
 import Document from "./document.js";
 import Index from "./index.js";
 import WorkerIndex from "./worker/index.js";
@@ -56,7 +56,7 @@ const FlexSearch = {
 
     "Index": Index,
     "Document": SUPPORT_DOCUMENT ? Document : null,
-    "Worker": WorkerIndex,
+    "Worker": SUPPORT_WORKER ? WorkerIndex : null,
     "registerCharset": registerCharset,
     "registerLanguage": registerLanguage
 };
diff --git a/src/worker/node.js b/src/worker/node.js
index 725667e..4a27ca2 100644
--- a/src/worker/node.js
+++ b/src/worker/node.js
@@ -1,5 +1,5 @@
 const { parentPort } = require("worker_threads");
-const { Index } = require("../flexsearch.min.js");
+const { Index } = require("../flexsearch.bundle.js");
 
 let index;
 
diff --git a/task/build.js b/task/build.js
index db2e807..f0969e8 100644
--- a/task/build.js
+++ b/task/build.js
@@ -55,12 +55,16 @@ var options = (function(argv){
 
                 compilation_level = val;
             }
+            else if(index === "POLYFILL"){
+
+                use_polyfill = val === "true";
+            }
             else{
 
-                if(index !== "RELEASE"){
-
-                    //flag_str += " --define='" + index + "=" + val + "'";
-                }
+                // if(index !== "RELEASE"){
+                //
+                //     flag_str += " --define='" + index + "=" + val + "'";
+                // }
 
                 arr[index] = val;
             }
@@ -76,9 +80,15 @@ var options = (function(argv){
 })(process.argv);
 
 var release = options["RELEASE"];
-const light_version = (release === "light") || (process.argv[2] === "--light");
-const es5_version = (release === "es5") || (process.argv[2] === "--es5");
-const module_version = (release === "module") || (process.argv[2] === "--module");
+
+// const light_version = (release === "light") || (process.argv[2] === "--light");
+// const es5_version = (release === "es5") || (process.argv[2] === "--es5");
+// const module_version = (release === "module") || (process.argv[2] === "--module");
+
+if(release === "es5"){
+
+    release = "ES5";
+}
 
 let parameter = (function(opt){
 
@@ -103,7 +113,7 @@ let parameter = (function(opt){
     return parameter;
 })({
 
-    compilation_level: compilation_level || (release === "pre" ? "SIMPLE" : (release === "debug" ? "WHITESPACE" : "ADVANCED_OPTIMIZATIONS")), //"SIMPLE"
+    compilation_level: compilation_level || "ADVANCED_OPTIMIZATIONS", //"SIMPLE"
     use_types_for_optimization: true,
     //new_type_inf: true,
     //jscomp_warning: "newCheckTypes",
@@ -131,9 +141,9 @@ let parameter = (function(opt){
     module_resolution: "BROWSER",
     //dependency_mode: "SORT_ONLY",
     //js_module_root: "./",
-    entry_point: "./src/webpack.js",
+    entry_point: "./tmp/webpack.js",
     //manage_closure_dependencies: true,
-    dependency_mode: "PRUNE_LEGACY",
+    dependency_mode: "PRUNE", // PRUNE_LEGACY
     rewrite_polyfills: use_polyfill || false,
 
     // isolation_mode: "IIFE",
@@ -142,15 +152,15 @@ let parameter = (function(opt){
     //formatting: "PRETTY_PRINT"
 });
 
-if(release === "pre" || release === "debug"){
+// if(release === "pre" || release === "debug"){
+//
+//     parameter += ' --formatting=PRETTY_PRINT';
+// }
 
-    parameter += ' --formatting=PRETTY_PRINT';
-}
-
-if(release === "demo"){
-
-    options['RELEASE'] = "custom";
-}
+// if(release === "demo"){
+//
+//     options['RELEASE'] = "custom";
+// }
 
 const custom = (!release || (release === "custom"));
 
@@ -222,17 +232,20 @@ else{
     :
         "java -jar node_modules/google-closure-compiler-java/compiler.jar"
 
-    ) + parameter + " --js='src/**.js' --js='!src/**/node.js'" + flag_str + " --js_output_file='" + filename + "' && exit 0", function(){
+    ) + parameter + " --js='tmp/**.js' --js='!tmp/**/node.js'" + flag_str + " --js_output_file='" + filename + "' && exit 0", function(){
 
         let build = fs.readFileSync(filename);
         let preserve = fs.readFileSync("src/index.js", "utf8");
 
         const package_json = require("../package.json");
 
-        preserve = preserve.replace("* FlexSearch.js", "* FlexSearch.js v" + package_json.version + (light_version ? " (Light)" : es5_version ? " (ES5)" : ""));
+        preserve = preserve.replace("* FlexSearch.js", "* FlexSearch.js v" + package_json.version + (release ? " (" + (release.charAt(0).toUpperCase() + release.substring(1)) + ")" : ""));
         build = preserve.substring(0, preserve.indexOf('*/') + 2) + "\n" + build;
 
-        build = build.replace("(function(self){'use strict';", "(function _f(self){'use strict';try{if(module)self=module}catch(e){}self._factory=_f;");
+        if(release === "bundle"){
+
+            build = build.replace("(function(self){'use strict';", "(function _f(self){'use strict';try{if(module)self=module}catch(e){}self._factory=_f;");
+        }
 
         if(release === "pre"){