diff --git a/.circleci/config.yml b/.circleci/config.yml
index 322960ef..0b026b27 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -28,5 +28,9 @@ jobs:
     steps:
       - checkout
       - install_deps
+      - run: yarn build
       - run: yarn test
       - run: yarn test:repl
+      - run: yarn lint:ci
+      - run: yarn type-check
+
diff --git a/.eslintrc b/.eslintrc
index f271674e..731c6bee 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -4,8 +4,6 @@
     "@shelf/eslint-config/typescript"
   ],
   "rules": {
-    "@typescript-eslint/no-var-requires": "off",
-    "no-console": "off",
-    "import/order": "off"
+    "@typescript-eslint/no-var-requires": "off"
   }
 }
diff --git a/.gitignore b/.gitignore
index b5a14b39..601563de 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,7 @@
 .idea/
 coverage/
 node_modules/
+lib/
 temp
 yarn.lock
 *.log
diff --git a/jest-preset.js b/jest-preset.js
index 6e860782..e054a904 100644
--- a/jest-preset.js
+++ b/jest-preset.js
@@ -1,7 +1,3 @@
-const {resolve} = require('path');
+const preset = require('./lib').default;
 
-module.exports = {
-  globalSetup: resolve(__dirname, './setup.js'),
-  globalTeardown: resolve(__dirname, './teardown.js'),
-  testEnvironment: resolve(__dirname, './environment.js'),
-};
+module.exports = preset;
diff --git a/package.json b/package.json
index 1681fd4c..ba6102d8 100644
--- a/package.json
+++ b/package.json
@@ -17,21 +17,32 @@
     "email": "vlad@shelf.io",
     "url": "shelf.io"
   },
+  "files": [
+    "jest-preset.js",
+    "lib/"
+  ],
   "scripts": {
-    "lint": "eslint . --fix --ext .js,.json,.ts --quiet",
+    "build": "rm -rf lib/ && yarn build:types && babel src --out-dir lib --ignore '**/*.test.ts' --extensions '.ts'",
+    "build:types": "tsc --emitDeclarationOnly --declaration --isolatedModules false --declarationDir lib",
+    "lint": "eslint . --ext .js,.ts,.json --fix",
+    "lint:ci": "eslint . --ext .js,.ts,.json",
+    "prepack": "yarn build",
     "test": "jest",
-    "test:repl": "MONGO_MEMORY_SERVER_FILE=jest-mongodb-config-repl.js jest"
+    "test:repl": "MONGO_MEMORY_SERVER_FILE=jest-mongodb-config-repl.js jest",
+    "type-check": "tsc --noEmit",
+    "type-check:watch": "npm run type-check -- --watch"
   },
   "lint-staged": {
     "*.{html,md,yml}": [
-      "prettier --write",
-      "git add"
+      "prettier --write"
     ],
-    "*.{js,json}": [
-      "eslint --fix",
-      "git add"
+    "*.{ts,js,json}": [
+      "eslint --fix"
     ]
   },
+  "babel": {
+  "extends": "@shelf/babel-config/backend"
+  },
   "prettier": "@shelf/prettier-config",
   "jest": {
     "preset": "./jest-preset.js"
@@ -42,8 +53,14 @@
     "uuid": "8.3.2"
   },
   "devDependencies": {
+    "@babel/cli": "7.18.10",
+    "@babel/core": "7.18.10",
+    "@shelf/babel-config": "1.2.0",
     "@shelf/eslint-config": "2.18.0",
     "@shelf/prettier-config": "1.0.0",
+    "@shelf/tsconfig": "0.0.8",
+    "@types/jest": "28.1.6",
+    "@types/node": "16",
     "eslint": "8.22.0",
     "husky": "8.0.1",
     "jest": "28.1.3",
diff --git a/environment.js b/src/environment.ts
similarity index 54%
rename from environment.js
rename to src/environment.ts
index 692119d9..8f827fea 100644
--- a/environment.js
+++ b/src/environment.ts
@@ -1,31 +1,35 @@
-const {TestEnvironment} = require('jest-environment-node');
-const path = require('path');
-const fs = require('fs');
+import {TestEnvironment} from 'jest-environment-node';
+import {join as pathJoin} from 'path';
+import {readFileSync} from 'fs';
+import type {EnvironmentContext} from '@jest/environment';
+import type {JestEnvironmentConfig} from '@jest/environment';
+import {MongoMemoryReplSet, MongoMemoryServer} from 'mongodb-memory-server';
+import {getMongodbMemoryOptions} from './helpers';
+
 const uuid = require('uuid');
-const {MongoMemoryServer, MongoMemoryReplSet} = require('mongodb-memory-server');
-const {getMongodbMemoryOptions} = require('./helpers');
 
+// eslint-disable-next-line import/order
 const debug = require('debug')('jest-mongodb:environment');
 
 const cwd = process.cwd();
 
-const globalConfigPath = path.join(cwd, 'globalConfig.json');
+const globalConfigPath = pathJoin(cwd, 'globalConfig.json');
 const options = getMongodbMemoryOptions();
 const isReplSet = Boolean(options.replSet);
 
 debug(`isReplSet`, isReplSet);
 
-let mongo = isReplSet ? new MongoMemoryReplSet(options) : new MongoMemoryServer(options);
+const mongo = isReplSet ? new MongoMemoryReplSet(options) : new MongoMemoryServer(options);
 
 module.exports = class MongoEnvironment extends TestEnvironment {
-  constructor(config, context) {
+  constructor(config: JestEnvironmentConfig, context: EnvironmentContext) {
     super(config, context);
   }
 
   async setup() {
     debug('Setup MongoDB Test Environment');
 
-    const globalConfig = JSON.parse(fs.readFileSync(globalConfigPath, 'utf-8'));
+    const globalConfig = JSON.parse(readFileSync(globalConfigPath, 'utf-8'));
 
     if (globalConfig.mongoUri) {
       this.global.__MONGO_URI__ = globalConfig.mongoUri;
@@ -48,7 +52,9 @@ module.exports = class MongoEnvironment extends TestEnvironment {
     await super.teardown();
   }
 
+  // @ts-ignore
   runScript(script) {
+    // @ts-ignore
     return super.runScript(script);
   }
 };
diff --git a/helpers.js b/src/helpers.ts
similarity index 78%
rename from helpers.js
rename to src/helpers.ts
index 4d284f7b..011b74a6 100644
--- a/helpers.js
+++ b/src/helpers.ts
@@ -1,9 +1,9 @@
-const {resolve} = require('path');
+import {resolve} from 'path';
 
 const cwd = process.cwd();
 const configFile = process.env.MONGO_MEMORY_SERVER_FILE || 'jest-mongodb-config.js';
 
-module.exports.getMongodbMemoryOptions = function () {
+export function getMongodbMemoryOptions() {
   try {
     const {mongodbMemoryServerOptions} = require(resolve(cwd, configFile));
 
@@ -17,9 +17,9 @@ module.exports.getMongodbMemoryOptions = function () {
       instance: {},
     };
   }
-};
+}
 
-module.exports.getMongoURLEnvName = function () {
+export function getMongoURLEnvName() {
   try {
     const {mongoURLEnvName} = require(resolve(cwd, configFile));
 
@@ -27,9 +27,9 @@ module.exports.getMongoURLEnvName = function () {
   } catch (e) {
     return 'MONGO_URL';
   }
-};
+}
 
-module.exports.shouldUseSharedDBForAllJestWorkers = function () {
+export function shouldUseSharedDBForAllJestWorkers() {
   try {
     const {useSharedDBForAllJestWorkers} = require(resolve(cwd, configFile));
 
@@ -41,4 +41,4 @@ module.exports.shouldUseSharedDBForAllJestWorkers = function () {
   } catch (e) {
     return true;
   }
-};
+}
diff --git a/src/index.ts b/src/index.ts
new file mode 100644
index 00000000..a66f6723
--- /dev/null
+++ b/src/index.ts
@@ -0,0 +1,9 @@
+import {resolve} from 'path';
+
+export * from './types';
+
+export default {
+  globalSetup: resolve(__dirname, './setup.js'),
+  globalTeardown: resolve(__dirname, './teardown.js'),
+  testEnvironment: resolve(__dirname, './environment.js'),
+};
diff --git a/setup.js b/src/setup.ts
similarity index 77%
rename from setup.js
rename to src/setup.ts
index 6bb2fb38..beea462a 100644
--- a/setup.js
+++ b/src/setup.ts
@@ -1,12 +1,13 @@
 /* eslint-disable multiline-ternary */
-const fs = require('fs');
-const {join} = require('path');
-const {MongoMemoryServer, MongoMemoryReplSet} = require('mongodb-memory-server');
-const {
-  getMongodbMemoryOptions,
+import {writeFileSync} from 'fs';
+import {join} from 'path';
+import {MongoMemoryReplSet, MongoMemoryServer} from 'mongodb-memory-server';
+import {
   getMongoURLEnvName,
+  getMongodbMemoryOptions,
   shouldUseSharedDBForAllJestWorkers,
-} = require('./helpers');
+} from './helpers';
+import type {Mongo} from './types';
 
 const debug = require('debug')('jest-mongodb:setup');
 const mongoMemoryServerOptions = getMongodbMemoryOptions();
@@ -14,7 +15,8 @@ const isReplSet = Boolean(mongoMemoryServerOptions.replSet);
 
 debug(`isReplSet ${isReplSet}`);
 
-const mongo = isReplSet
+// @ts-ignore
+const mongo: Mongo = isReplSet
   ? new MongoMemoryReplSet(mongoMemoryServerOptions)
   : new MongoMemoryServer(mongoMemoryServerOptions);
 
@@ -23,7 +25,7 @@ const globalConfigPath = join(cwd, 'globalConfig.json');
 
 module.exports = async () => {
   const options = getMongodbMemoryOptions();
-  const mongoConfig = {};
+  const mongoConfig: {mongoUri?: string; mongoDBName?: string} = {};
 
   debug(`shouldUseSharedDBForAllJestWorkers: ${shouldUseSharedDBForAllJestWorkers()}`);
 
@@ -46,6 +48,6 @@ module.exports = async () => {
   mongoConfig.mongoDBName = options.instance.dbName;
 
   // Write global config to disk because all tests run in different contexts.
-  fs.writeFileSync(globalConfigPath, JSON.stringify(mongoConfig));
+  writeFileSync(globalConfigPath, JSON.stringify(mongoConfig));
   debug('Config is written');
 };
diff --git a/teardown.js b/src/teardown.ts
similarity index 80%
rename from teardown.js
rename to src/teardown.ts
index 097eff8a..eeedc180 100644
--- a/teardown.js
+++ b/src/teardown.ts
@@ -1,6 +1,7 @@
+import {join} from 'path';
+import {unlink} from 'fs';
+
 const debug = require('debug')('jest-mongodb:teardown');
-const {join} = require('path');
-const fs = require('fs');
 
 const cwd = process.cwd();
 const globalConfigPath = join(cwd, 'globalConfig.json');
@@ -10,7 +11,7 @@ module.exports = async function () {
   if (global.__MONGOD__) {
     await global.__MONGOD__.stop();
   }
-  fs.unlink(globalConfigPath, err => {
+  unlink(globalConfigPath, err => {
     if (err) {
       debug('Config could not be deleted');
 
diff --git a/src/types.ts b/src/types.ts
new file mode 100644
index 00000000..1ae5d4c9
--- /dev/null
+++ b/src/types.ts
@@ -0,0 +1,10 @@
+/* eslint-disable */
+import { MongoMemoryReplSet, MongoMemoryServer } from "mongodb-memory-server";
+
+declare global {
+  var __MONGOD__: Mongo;
+  var __MONGO_URI__: string;
+  var __MONGO_DB_NAME__: string
+}
+
+export type Mongo = (MongoMemoryReplSet | MongoMemoryServer) & {isRunning: boolean}
diff --git a/mongo-aggregate.test.js b/test/mongo-aggregate.test.ts
similarity index 83%
rename from mongo-aggregate.test.js
rename to test/mongo-aggregate.test.ts
index daec0a7c..a7c03623 100644
--- a/mongo-aggregate.test.js
+++ b/test/mongo-aggregate.test.ts
@@ -1,12 +1,16 @@
-const {MongoClient} = require('mongodb');
+import type {Db} from 'mongodb';
+import {MongoClient} from 'mongodb';
+import '../src/types';
 
 describe('insert', () => {
   const uri = global.__MONGO_URI__;
-  let connection;
-  let db;
+  let connection: MongoClient;
+  let db: Db;
 
   beforeAll(async () => {
+    // @ts-ignore
     connection = await MongoClient.connect(uri, {
+      // @ts-ignore
       useNewUrlParser: true,
       useUnifiedTopology: true,
     });
diff --git a/mongo-insert.test.js b/test/mongo-insert.test.ts
similarity index 82%
rename from mongo-insert.test.js
rename to test/mongo-insert.test.ts
index 9808a87b..b42b80dc 100644
--- a/mongo-insert.test.js
+++ b/test/mongo-insert.test.ts
@@ -1,12 +1,16 @@
-const {MongoClient} = require('mongodb');
+import type {Db} from 'mongodb';
+import {MongoClient} from 'mongodb';
+import '../src/types';
 
 describe('insert', () => {
   const uri = global.__MONGO_URI__;
-  let connection;
-  let db;
+  let connection: MongoClient;
+  let db: Db;
 
   beforeAll(async () => {
+    // @ts-ignore
     connection = await MongoClient.connect(uri, {
+      // @ts-ignore
       useNewUrlParser: true,
       useUnifiedTopology: true,
     });
@@ -21,7 +25,7 @@ describe('insert', () => {
     const users = db.collection('users');
 
     const mockUser = {_id: 'some-user-id', name: 'John'};
-    await users.insertOne(mockUser);
+    await users.insertOne(mockUser as any);
 
     const insertedUser = await users.findOne({_id: 'some-user-id'});
 
diff --git a/mongo-parallelism.test.js b/test/mongo-parallelism.test.ts
similarity index 71%
rename from mongo-parallelism.test.js
rename to test/mongo-parallelism.test.ts
index 845038b7..df3fce14 100644
--- a/mongo-parallelism.test.js
+++ b/test/mongo-parallelism.test.ts
@@ -1,13 +1,17 @@
-const {MongoClient} = require('mongodb');
-const {shouldUseSharedDBForAllJestWorkers} = require('./helpers');
+import type {Db} from 'mongodb';
+import {MongoClient} from 'mongodb';
+import '../src/types';
+import {shouldUseSharedDBForAllJestWorkers} from '../src/helpers';
 
 describe('parallelism: first worker', () => {
   const uri = global.__MONGO_URI__;
-  let connection;
-  let db;
+  let connection: MongoClient;
+  let db: Db;
 
   beforeAll(async () => {
+    // @ts-ignore
     connection = await MongoClient.connect(uri, {
+      // @ts-ignore
       useNewUrlParser: true,
       useUnifiedTopology: true,
     });
diff --git a/mongo-parallelism2.test.js b/test/mongo-parallelism2.test.ts
similarity index 72%
rename from mongo-parallelism2.test.js
rename to test/mongo-parallelism2.test.ts
index 86042066..90e3ad83 100644
--- a/mongo-parallelism2.test.js
+++ b/test/mongo-parallelism2.test.ts
@@ -1,13 +1,17 @@
-const {MongoClient} = require('mongodb');
-const {shouldUseSharedDBForAllJestWorkers} = require('./helpers');
+import type {Db} from 'mongodb';
+import {MongoClient} from 'mongodb';
+import '../src/types';
+import {shouldUseSharedDBForAllJestWorkers} from '../src/helpers';
 
 describe('parallelism: second worker', () => {
   const uri = global.__MONGO_URI__;
-  let connection;
-  let db;
+  let connection: MongoClient;
+  let db: Db;
 
   beforeAll(async () => {
+    // @ts-ignore
     connection = await MongoClient.connect(uri, {
+      // @ts-ignore
       useNewUrlParser: true,
       useUnifiedTopology: true,
     });
diff --git a/mongo-parallelism3.test.js b/test/mongo-parallelism3.test.ts
similarity index 72%
rename from mongo-parallelism3.test.js
rename to test/mongo-parallelism3.test.ts
index 0a970ec7..76239530 100644
--- a/mongo-parallelism3.test.js
+++ b/test/mongo-parallelism3.test.ts
@@ -1,13 +1,17 @@
-const {MongoClient} = require('mongodb');
-const {shouldUseSharedDBForAllJestWorkers} = require('./helpers');
+import type {Db} from 'mongodb';
+import {MongoClient} from 'mongodb';
+import '../src/types';
+import {shouldUseSharedDBForAllJestWorkers} from '../src/helpers';
 
 describe('parallelism: third worker', () => {
   const uri = global.__MONGO_URI__;
-  let connection;
-  let db;
+  let connection: MongoClient;
+  let db: Db;
 
   beforeAll(async () => {
+    // @ts-ignore
     connection = await MongoClient.connect(uri, {
+      // @ts-ignore
       useNewUrlParser: true,
       useUnifiedTopology: true,
     });
diff --git a/tsconfig.json b/tsconfig.json
new file mode 100644
index 00000000..5bbaf968
--- /dev/null
+++ b/tsconfig.json
@@ -0,0 +1,8 @@
+{
+  "extends": "@shelf/tsconfig/backend",
+  "compilerOptions": {
+    "strict": true
+  },
+  "exclude": ["node_modules"],
+  "include": ["src"]
+}