diff --git a/README.md b/README.md
index c0f8c2b..61635ec 100644
--- a/README.md
+++ b/README.md
@@ -1,5 +1,8 @@
 FlexSearch v0.8: [Overview and Migration Guide](doc/0.8.0.md)
-<h1></h1>
+
+[<img src="https://devin.ai/assets/deepwiki-badge.png" alt="Ask DeepWiki.com" height="20"/>](https://deepwiki.com/nextapps-de/flexsearch)
+
+<h2></h2>
 <h1>
     <img src="doc/flexsearch-logo-glass-animated.svg" style="width: 580px; max-width: 100%" alt="FlexSearch.js: Next-Generation full-text search library for Browser and Node.js">
     <p></p>
@@ -38,13 +41,13 @@ FlexSearch has been helping developers around the world build powerful, efficien
 
 <a href="https://antithesis.com" target="_blank" style="display: inline-block">
     <center>
-        <img src="doc/antithesis_logo.svg" width="180" alt="Donate using Open Collective"><br>
+        <img src="doc/antithesis_logo.svg" width="200" alt="Donate using Open Collective"><br>
         Antithesis Operations LLC
     </center>
 </a>
 <h1></h1>
 
-FlexSearch performs queries up to 1,000,000 times faster <a href="https://nextapps-de.github.io/flexsearch/" target="_blank">compared to other libraries</a> by also providing <a href="https://nextapps-de.github.io/flexsearch/match.html" target="_blank">powerful search capabilities</a> like multi-field search (document search), phonetic transformations, partial matching, tag-search or suggestions.
+FlexSearch performs queries up to 1,000,000 times faster <a href="https://nextapps-de.github.io/flexsearch/" target="_blank">compared to other libraries</a> by also providing <a href="https://nextapps-de.github.io/flexsearch/match.html" target="_blank">powerful search capabilities</a> like multi-field search (document search), phonetic transformations, partial matching, tag-search, result highlighting or suggestions.
 
 Bigger workloads are scalable through workers to perform any updates or queries to the index in parallel through dedicated balanced threads.
 
@@ -561,9 +564,9 @@ The **_dist_** folder is located in: `node_modules/flexsearch/dist/`
     </tr>
     <tr>
         <td>File Size (gzip)</td>
-        <td>14.0 kb</td>
-        <td>9.0 kb</td>
-        <td>4.4 kb</td>
+        <td>16.3 kb</td>
+        <td>11.4 kb</td>
+        <td>4.5 kb</td>
     </tr>
 </table>
 
diff --git a/index.d.ts b/index.d.ts
index 8addafe..ca204f2 100644
--- a/index.d.ts
+++ b/index.d.ts
@@ -160,7 +160,8 @@ declare module "flexsearch" {
         LatinBalance: EncoderOptions,
         LatinAdvanced: EncoderOptions,
         LatinExtra: EncoderOptions,
-        LatinSoundex: EncoderOptions
+        LatinSoundex: EncoderOptions,
+        CJK: EncoderOptions
     };
 
     /**
@@ -199,7 +200,7 @@ declare module "flexsearch" {
         commit?: boolean;
 
         // Language-specific Options and Encoding
-        encoder?: typeof Charset | Encoders | EncoderOptions;
+        encoder?: typeof Charset | Encoders | EncoderOptions | Encoder;
         encode?: (text: string) => string[],
         rtl?: boolean;
     };
@@ -598,34 +599,6 @@ declare module "flexsearch" {
         ): Promise<DocumentSearchResults<D, R, E, M>>;
     }
 
-    type IdType =
-        "text" |
-        "char" |
-        "varchar" |
-        "string" |
-        "number" |
-        "numeric" |
-        "integer" |
-        "smallint" |
-        "tinyint" |
-        "mediumint" |
-        "int" |
-        "int8" |
-        "uint8" |
-        "int16" |
-        "uint16" |
-        "int32" |
-        "uint32" |
-        "int64" |
-        "uint64" |
-        "bigint";
-
-    type PersistentOptions = {
-        name?: string;
-        type?: IdType;
-        db?: any;
-    };
-
     type DefaultResolve = {
         query?: string;
         limit?: number;
@@ -744,7 +717,53 @@ declare module "flexsearch" {
     export default FlexSearch;
 }
 
+// -----------------------------------
+
+type IdType =
+    "text" |
+    "char" |
+    "varchar" |
+    "string" |
+    "number" |
+    "numeric" |
+    "integer" |
+    "smallint" |
+    "tinyint" |
+    "mediumint" |
+    "int" |
+    "int8" |
+    "uint8" |
+    "int16" |
+    "uint16" |
+    "int32" |
+    "uint32" |
+    "int64" |
+    "uint64" |
+    "bigint";
+
+type PersistentOptions = {
+    name?: string;
+    type?: IdType;
+    db?: any;
+};
+
+declare module "flexsearch/db/*" {
+    export default StorageInterface;
+}
+
+declare module "flexsearch/db/indexeddb" {
+    export default class IndexedDB extends StorageInterface{
+        db: IDBDatabase
+    }
+}
+
+// -----------------------------------
+
+declare module "flexsearch/lang/*" {
+    const Options: EncoderOptions;
+    export default Options;
+}
+
 // https://www.typescriptlang.org/docs/handbook/jsdoc-supported-types.html
 // https://github.com/futurGH/ts-to-jsdoc
 // https://sethmac.com/typescript-to-jsdoc/
-
diff --git a/src/db/clickhouse/index.d.ts b/src/db/clickhouse/index.d.ts
new file mode 100644
index 0000000..4ea4f70
--- /dev/null
+++ b/src/db/clickhouse/index.d.ts
@@ -0,0 +1,41 @@
+declare module "flexsearch/db/clickhouse" {
+
+    type IdType =
+        "text" |
+        "char" |
+        "varchar" |
+        "string" |
+        "number" |
+        "numeric" |
+        "integer" |
+        "smallint" |
+        "tinyint" |
+        "mediumint" |
+        "int" |
+        "int8" |
+        "uint8" |
+        "int16" |
+        "uint16" |
+        "int32" |
+        "uint32" |
+        "int64" |
+        "uint64" |
+        "bigint";
+
+    type PersistentOptions = {
+        name?: string;
+        type?: IdType;
+        db?: any;
+    };
+
+    export default class StorageInterface {
+        constructor(name: string, config: PersistentOptions);
+        constructor(config: string | PersistentOptions);
+        //mount(index: Index | Document) : Promise<void>;
+        open() : Promise<void>;
+        close() : Promise<void>;
+        destroy() : Promise<void>;
+        clear() : Promise<void>;
+        db: any;
+    }
+}
diff --git a/src/db/indexeddb/index.d.ts b/src/db/indexeddb/index.d.ts
new file mode 100644
index 0000000..0a9f5c0
--- /dev/null
+++ b/src/db/indexeddb/index.d.ts
@@ -0,0 +1,41 @@
+declare module "flexsearch/db/indexeddb" {
+
+    type IdType =
+        "text" |
+        "char" |
+        "varchar" |
+        "string" |
+        "number" |
+        "numeric" |
+        "integer" |
+        "smallint" |
+        "tinyint" |
+        "mediumint" |
+        "int" |
+        "int8" |
+        "uint8" |
+        "int16" |
+        "uint16" |
+        "int32" |
+        "uint32" |
+        "int64" |
+        "uint64" |
+        "bigint";
+
+    type PersistentOptions = {
+        name?: string;
+        type?: IdType;
+        db?: IDBDatabase;
+    };
+
+    export default class StorageInterface {
+        constructor(name: string, config: PersistentOptions);
+        constructor(config: string | PersistentOptions);
+        //mount(index: Index | Document) : Promise<void>;
+        open() : Promise<void>;
+        close() : Promise<void>;
+        destroy() : Promise<void>;
+        clear() : Promise<void>;
+        db: IDBDatabase;
+    }
+}
diff --git a/src/db/mongodb/index.d.ts b/src/db/mongodb/index.d.ts
new file mode 100644
index 0000000..44b09d2
--- /dev/null
+++ b/src/db/mongodb/index.d.ts
@@ -0,0 +1,41 @@
+declare module "flexsearch/db/mongodb" {
+
+    type IdType =
+        "text" |
+        "char" |
+        "varchar" |
+        "string" |
+        "number" |
+        "numeric" |
+        "integer" |
+        "smallint" |
+        "tinyint" |
+        "mediumint" |
+        "int" |
+        "int8" |
+        "uint8" |
+        "int16" |
+        "uint16" |
+        "int32" |
+        "uint32" |
+        "int64" |
+        "uint64" |
+        "bigint";
+
+    type PersistentOptions = {
+        name?: string;
+        type?: IdType;
+        db?: any;
+    };
+
+    export default class StorageInterface {
+        constructor(name: string, config: PersistentOptions);
+        constructor(config: string | PersistentOptions);
+        //mount(index: Index | Document) : Promise<void>;
+        open() : Promise<void>;
+        close() : Promise<void>;
+        destroy() : Promise<void>;
+        clear() : Promise<void>;
+        db: any;
+    }
+}
diff --git a/src/db/postgres/index.d.ts b/src/db/postgres/index.d.ts
new file mode 100644
index 0000000..6ea0129
--- /dev/null
+++ b/src/db/postgres/index.d.ts
@@ -0,0 +1,41 @@
+declare module "flexsearch/db/postgres" {
+
+    type IdType =
+        "text" |
+        "char" |
+        "varchar" |
+        "string" |
+        "number" |
+        "numeric" |
+        "integer" |
+        "smallint" |
+        "tinyint" |
+        "mediumint" |
+        "int" |
+        "int8" |
+        "uint8" |
+        "int16" |
+        "uint16" |
+        "int32" |
+        "uint32" |
+        "int64" |
+        "uint64" |
+        "bigint";
+
+    type PersistentOptions = {
+        name?: string;
+        type?: IdType;
+        db?: any;
+    };
+
+    export default class StorageInterface {
+        constructor(name: string, config: PersistentOptions);
+        constructor(config: string | PersistentOptions);
+        //mount(index: Index | Document) : Promise<void>;
+        open() : Promise<void>;
+        close() : Promise<void>;
+        destroy() : Promise<void>;
+        clear() : Promise<void>;
+        db: any;
+    }
+}
diff --git a/src/db/redis/index.d.ts b/src/db/redis/index.d.ts
new file mode 100644
index 0000000..a1c6df9
--- /dev/null
+++ b/src/db/redis/index.d.ts
@@ -0,0 +1,41 @@
+declare module "flexsearch/db/redis" {
+
+    type IdType =
+        "text" |
+        "char" |
+        "varchar" |
+        "string" |
+        "number" |
+        "numeric" |
+        "integer" |
+        "smallint" |
+        "tinyint" |
+        "mediumint" |
+        "int" |
+        "int8" |
+        "uint8" |
+        "int16" |
+        "uint16" |
+        "int32" |
+        "uint32" |
+        "int64" |
+        "uint64" |
+        "bigint";
+
+    type PersistentOptions = {
+        name?: string;
+        type?: IdType;
+        db?: any;
+    };
+
+    export default class StorageInterface {
+        constructor(name: string, config: PersistentOptions);
+        constructor(config: string | PersistentOptions);
+        //mount(index: Index | Document) : Promise<void>;
+        open() : Promise<void>;
+        close() : Promise<void>;
+        destroy() : Promise<void>;
+        clear() : Promise<void>;
+        db: any;
+    }
+}
diff --git a/src/db/sqlite/index.d.ts b/src/db/sqlite/index.d.ts
new file mode 100644
index 0000000..070d09b
--- /dev/null
+++ b/src/db/sqlite/index.d.ts
@@ -0,0 +1,41 @@
+declare module "flexsearch/db/sqlite" {
+
+    type IdType =
+        "text" |
+        "char" |
+        "varchar" |
+        "string" |
+        "number" |
+        "numeric" |
+        "integer" |
+        "smallint" |
+        "tinyint" |
+        "mediumint" |
+        "int" |
+        "int8" |
+        "uint8" |
+        "int16" |
+        "uint16" |
+        "int32" |
+        "uint32" |
+        "int64" |
+        "uint64" |
+        "bigint";
+
+    type PersistentOptions = {
+        name?: string;
+        type?: IdType;
+        db?: any;
+    };
+
+    export default class StorageInterface {
+        constructor(name: string, config: PersistentOptions);
+        constructor(config: string | PersistentOptions);
+        //mount(index: Index | Document) : Promise<void>;
+        open() : Promise<void>;
+        close() : Promise<void>;
+        destroy() : Promise<void>;
+        clear() : Promise<void>;
+        db: any;
+    }
+}
diff --git a/test/async.js b/test/async.js
index 20cbc4f..4fa23d6 100644
--- a/test/async.js
+++ b/test/async.js
@@ -57,7 +57,7 @@ if(!build_light) describe("Add (Async)", function(){
             if(duration) break;
         }
 
-        expect(duration).to.closeTo(0, 3);
+        expect(duration).to.closeTo(0, 4);
 
         for(let i = 0; i < 999999999; i++){
             await index.addAsync(i, "foo");