diff --git a/src/common/interfaces/antares.ts b/src/common/interfaces/antares.ts
index 20e11a61..9e75a34d 100644
--- a/src/common/interfaces/antares.ts
+++ b/src/common/interfaces/antares.ts
@@ -2,7 +2,7 @@ import * as mysql from 'mysql2/promise';
 import * as pg from 'pg';
 import MysqlExporter from 'src/main/libs/exporters/sql/MysqlExporter';
 import PostgreSQLExporter from 'src/main/libs/exporters/sql/PostgreSQLExporter';
-import MySQLImporter from 'src/main/libs/importers/sql/MysqlImporter';
+import MySQLImporter from 'src/main/libs/importers/sql/MySQLlImporter';
 import PostgreSQLImporter from 'src/main/libs/importers/sql/PostgreSQLImporter';
 import SSHConfig from 'ssh2-promise/lib/sshConfig';
 import { MySQLClient } from '../../main/libs/clients/MySQLClient';
diff --git a/src/common/interfaces/importer.ts b/src/common/interfaces/importer.ts
new file mode 100644
index 00000000..d0aa985a
--- /dev/null
+++ b/src/common/interfaces/importer.ts
@@ -0,0 +1,16 @@
+import * as antares from './antares';
+
+export interface ImportOptions {
+   uid: string;
+   schema: string;
+   type: antares.ClientCode;
+   file: string;
+}
+
+export interface ImportState {
+   fileSize?: number;
+   readPosition?: number;
+   percentage?: number;
+   queryCount?: number;
+   op?: string;
+}
diff --git a/src/common/interfaces/parser.ts b/src/common/interfaces/parser.ts
new file mode 100644
index 00000000..e69de29b
diff --git a/src/main/libs/importers/BaseImporter.js b/src/main/libs/importers/BaseImporter.ts
similarity index 76%
rename from src/main/libs/importers/BaseImporter.js
rename to src/main/libs/importers/BaseImporter.ts
index 901a5d98..807aedea 100644
--- a/src/main/libs/importers/BaseImporter.js
+++ b/src/main/libs/importers/BaseImporter.ts
@@ -1,8 +1,14 @@
-import fs from 'fs';
-import EventEmitter from 'events';
+import * as importer from 'common/interfaces/importer';
+import * as fs from 'fs';
+import * as EventEmitter from 'events';
 
 export class BaseImporter extends EventEmitter {
-   constructor (options) {
+   protected _options;
+   protected _isCancelled;
+   protected _fileHandler;
+   protected _state;
+
+   constructor (options: importer.ImportOptions) {
       super();
       this._options = options;
       this._isCancelled = false;
@@ -43,7 +49,7 @@ export class BaseImporter extends EventEmitter {
       this.emitUpdate({ op: 'cancelling' });
    }
 
-   emitUpdate (state) {
+   emitUpdate (state: importer.ImportState) {
       this.emit('progress', { ...this._state, ...state });
    }
 
diff --git a/src/main/libs/importers/sql/MysqlImporter.js b/src/main/libs/importers/sql/MySQLlImporter.ts
similarity index 83%
rename from src/main/libs/importers/sql/MysqlImporter.js
rename to src/main/libs/importers/sql/MySQLlImporter.ts
index dc9349da..51c8e418 100644
--- a/src/main/libs/importers/sql/MysqlImporter.js
+++ b/src/main/libs/importers/sql/MySQLlImporter.ts
@@ -1,14 +1,18 @@
-import fs from 'fs/promises';
+import * as mysql from 'mysql2';
+import * as importer from 'common/interfaces/importer';
+import * as fs from 'fs/promises';
 import MySQLParser from '../../parsers/MySQLParser';
 import { BaseImporter } from '../BaseImporter';
 
 export default class MySQLImporter extends BaseImporter {
-   constructor (client, options) {
+   protected _client: mysql.Pool
+
+   constructor (client: mysql.Pool, options: importer.ImportOptions) {
       super(options);
       this._client = client;
    }
 
-   async import () {
+   async import (): Promise<void> {
       try {
          const { size: totalFileSize } = await fs.stat(this._options.file);
          const parser = new MySQLParser();
@@ -60,7 +64,8 @@ export default class MySQLImporter extends BaseImporter {
 
             parser.on('pause', () => {
                this._fileHandler.unpipe(parser);
-               this._fileHandler.readableFlowing = false;
+               // eslint-disable-next-line @typescript-eslint/no-explicit-any
+               (this._fileHandler as any).readableFlowing = false;
             });
 
             this._fileHandler.on('data', (chunk) => {
diff --git a/src/main/libs/importers/sql/PostgreSQLImporter.js b/src/main/libs/importers/sql/PostgreSQLImporter.ts
similarity index 85%
rename from src/main/libs/importers/sql/PostgreSQLImporter.js
rename to src/main/libs/importers/sql/PostgreSQLImporter.ts
index a18f22c9..eb6a79fd 100644
--- a/src/main/libs/importers/sql/PostgreSQLImporter.js
+++ b/src/main/libs/importers/sql/PostgreSQLImporter.ts
@@ -1,14 +1,18 @@
+import * as pg from 'pg';
+import * as importer from 'common/interfaces/importer';
 import fs from 'fs/promises';
 import PostgreSQLParser from '../../parsers/PostgreSQLParser';
 import { BaseImporter } from '../BaseImporter';
 
 export default class PostgreSQLImporter extends BaseImporter {
-   constructor (client, options) {
+   protected _client: pg.PoolClient;
+
+   constructor (client: pg.PoolClient, options: importer.ImportOptions) {
       super(options);
       this._client = client;
    }
 
-   async import () {
+   async import (): Promise<void> {
       try {
          const { size: totalFileSize } = await fs.stat(this._options.file);
          const parser = new PostgreSQLParser();
@@ -60,7 +64,8 @@ export default class PostgreSQLImporter extends BaseImporter {
 
             parser.on('pause', () => {
                this._fileHandler.unpipe(parser);
-               this._fileHandler.readableFlowing = false;
+               // eslint-disable-next-line @typescript-eslint/no-explicit-any
+               (this._fileHandler as any).readableFlowing = false;
             });
 
             this._fileHandler.on('data', (chunk) => {
diff --git a/src/main/libs/parsers/MySQLParser.js b/src/main/libs/parsers/MySQLParser.ts
similarity index 80%
rename from src/main/libs/parsers/MySQLParser.js
rename to src/main/libs/parsers/MySQLParser.ts
index 3157a5e3..66bdd997 100644
--- a/src/main/libs/parsers/MySQLParser.js
+++ b/src/main/libs/parsers/MySQLParser.ts
@@ -1,7 +1,17 @@
-import { Transform } from 'stream';
+import { Transform, TransformCallback, TransformOptions } from 'stream';
 
 export default class MySQLParser extends Transform {
-   constructor (opts) {
+   private _buffer: string;
+   private _lastChar: string;
+   private _last9Chars: string;
+
+   encoding: BufferEncoding;
+   delimiter: string;
+   isEscape: boolean;
+   currentQuote: string;
+   isDelimiter: boolean;
+
+   constructor (opts?: TransformOptions & { delimiter: string }) {
       opts = {
          delimiter: ';',
          encoding: 'utf8',
@@ -21,7 +31,7 @@ export default class MySQLParser extends Transform {
       this.isDelimiter = false;
    }
 
-   _transform (chunk, encoding, next) {
+   _transform (chunk: Buffer, encoding: BufferEncoding, next: TransformCallback) {
       for (const char of chunk.toString(this.encoding)) {
          this.checkEscape();
          this._buffer += char;
@@ -49,7 +59,7 @@ export default class MySQLParser extends Transform {
       }
    }
 
-   checkNewDelimiter (char) {
+   checkNewDelimiter (char: string) {
       if (this.currentQuote === null && this._last9Chars === 'delimiter') {
          this.isDelimiter = true;
          this._buffer = '';
@@ -64,7 +74,7 @@ export default class MySQLParser extends Transform {
       }
    }
 
-   checkQuote (char) {
+   checkQuote (char: string) {
       const isQuote = !this.isEscape && (char === '\'' || char === '"');
       if (isQuote && this.currentQuote === char)
          this.currentQuote = null;
@@ -77,7 +87,7 @@ export default class MySQLParser extends Transform {
       if (this.isDelimiter)
          return false;
 
-      let query = false;
+      let query: false | string = false;
       let demiliterFound = false;
       if (this.currentQuote === null && this._buffer.length >= this.delimiter.length)
          demiliterFound = this._last9Chars.slice(-this.delimiter.length) === this.delimiter;
diff --git a/src/main/libs/parsers/PostgreSQLParser.js b/src/main/libs/parsers/PostgreSQLParser.ts
similarity index 83%
rename from src/main/libs/parsers/PostgreSQLParser.js
rename to src/main/libs/parsers/PostgreSQLParser.ts
index 883a07ac..a4a35cfa 100644
--- a/src/main/libs/parsers/PostgreSQLParser.js
+++ b/src/main/libs/parsers/PostgreSQLParser.ts
@@ -1,7 +1,23 @@
-import { Transform } from 'stream';
+import { Transform, TransformCallback, TransformOptions } from 'stream';
 
 export default class PostgreSQLParser extends Transform {
-   constructor (opts) {
+   private _buffer: string;
+   private _lastChar: string;
+   private _lastChars: string;
+   private _bodyWrapper: string;
+   private _bodyWrapperBuffer: string;
+   private _firstDollarFound: boolean;
+   private _isBody: boolean;
+   private _isSingleLineComment: boolean;
+   private _isMultiLineComment: boolean;
+
+   encoding: BufferEncoding;
+   delimiter: string;
+   isEscape: boolean;
+   currentQuote: string;
+   isDelimiter: boolean;
+
+   constructor (opts?: TransformOptions & { delimiter: string }) {
       opts = {
          delimiter: ';',
          encoding: 'utf8',
@@ -30,7 +46,7 @@ export default class PostgreSQLParser extends Transform {
       return this._isSingleLineComment || this._isMultiLineComment;
    }
 
-   _transform (chunk, encoding, next) {
+   _transform (chunk: Buffer, encoding: BufferEncoding, next: TransformCallback) {
       for (const char of chunk.toString(this.encoding)) {
          this.checkEscape();
          this._buffer += char;
@@ -82,7 +98,7 @@ export default class PostgreSQLParser extends Transform {
       }
    }
 
-   checkBodyWrapper (char) {
+   checkBodyWrapper (char: string) {
       if (this._isBody)
          this._isBody = this._lastChars !== this._bodyWrapper;
 
@@ -111,7 +127,7 @@ export default class PostgreSQLParser extends Transform {
       }
    }
 
-   checkQuote (char) {
+   checkQuote (char: string) {
       const isQuote = !this.isEscape && (char === '\'' || char === '"');
       if (isQuote && this.currentQuote === char)
          this.currentQuote = null;
@@ -124,7 +140,7 @@ export default class PostgreSQLParser extends Transform {
       if (this._isBody || this._isComment)
          return false;
 
-      let query = false;
+      let query: false | string = false;
       let demiliterFound = false;
 
       if (this.currentQuote === null && this._buffer.length >= this.delimiter.length)
diff --git a/src/main/workers/importer.js b/src/main/workers/importer.ts
similarity index 74%
rename from src/main/workers/importer.js
rename to src/main/workers/importer.ts
index f1c27636..67d56031 100644
--- a/src/main/workers/importer.js
+++ b/src/main/workers/importer.ts
@@ -1,7 +1,12 @@
+import * as antares from 'common/interfaces/antares';
+import * as pg from 'pg';
+import * as mysql from 'mysql2';
+import { MySQLClient } from '../libs/clients/MySQLClient';
+import { PostgreSQLClient } from '../libs/clients/PostgreSQLClient';
 import { ClientsFactory } from '../libs/ClientsFactory';
-import MySQLImporter from '../libs/importers/sql/MysqlImporter';
+import MySQLImporter from '../libs/importers/sql/MySQLlImporter';
 import PostgreSQLImporter from '../libs/importers/sql/PostgreSQLImporter';
-let importer;
+let importer: antares.Importer;
 
 process.on('message', async ({ type, dbConfig, options }) => {
    if (type === 'init') {
@@ -12,17 +17,17 @@ process.on('message', async ({ type, dbConfig, options }) => {
             schema: options.schema
          },
          poolSize: 1
-      });
+      }) as MySQLClient | PostgreSQLClient;
 
       const pool = await connection.getConnectionPool();
 
       switch (options.type) {
          case 'mysql':
          case 'maria':
-            importer = new MySQLImporter(pool, options);
+            importer = new MySQLImporter(pool as unknown as mysql.Pool, options);
             break;
          case 'pg':
-            importer = new PostgreSQLImporter(pool, options);
+            importer = new PostgreSQLImporter(pool as unknown as pg.PoolClient, options);
             break;
          default:
             process.send({