diff --git a/.eslintrc.js b/.eslintrc.js
new file mode 100644
index 0000000..cd41668
--- /dev/null
+++ b/.eslintrc.js
@@ -0,0 +1,24 @@
+module.exports = {
+  root: true,
+  env: {
+    es6: true,
+    node: true,
+  },
+  parser: '@typescript-eslint/parser',
+  parserOptions: {
+    sourceType: 'module',
+    ecmaVersion: 2019, // Node.js 12の場合は2019、他のバージョンのNode.jsを利用している場合は場合は適宜変更する
+    tsconfigRootDir: __dirname,
+    project: ['./tsconfig.eslint.json']
+  },
+  plugins: [
+    '@typescript-eslint',
+  ],
+  extends: [
+    'eslint:recommended',
+    'plugin:@typescript-eslint/recommended',
+    'plugin:@typescript-eslint/recommended-requiring-type-checking',
+  ],
+  rules: {
+  },
+};
\ No newline at end of file
diff --git a/index.ts b/index.ts
index 57c8c5f..f3b2755 100644
--- a/index.ts
+++ b/index.ts
@@ -62,7 +62,7 @@ export class GPIOAccess extends EventEmitter {
   /**
    * Unexport all exported GPIO ports.
    */
-  async unexportAll() {
+  async unexportAll(): Promise<void> {
     await Promise.all(
       [...this.ports.values()].map(port =>
         port.exported ? port.unexport() : undefined
@@ -121,7 +121,7 @@ export class GPIOPort extends EventEmitter {
     return this._exported;
   }
 
-  async export(direction: DirectionMode) {
+  async export(direction: DirectionMode): Promise<void> {
     if (!/^(in|out)$/.test(direction)) {
       throw new InvalidAccessError(`Must be "in" or "out".`);
     }
@@ -134,7 +134,7 @@ export class GPIOPort extends EventEmitter {
     }
 
     try {
-      clearInterval(this._timeout as any);
+      clearInterval(this._timeout as ReturnType<typeof setInterval>);
       if (!this.exported) {
         await fs.writeFile(
           path.join(SysfsGPIOPath, "export"),
@@ -147,6 +147,7 @@ export class GPIOPort extends EventEmitter {
       );
       if (direction === "in") {
         this._timeout = setInterval(
+          // eslint-disable-next-line
           this.read.bind(this),
           this._pollingInterval
         );
@@ -159,8 +160,8 @@ export class GPIOPort extends EventEmitter {
     this._exported = true;
   }
 
-  async unexport() {
-    clearInterval(this._timeout as any);
+  async unexport(): Promise<void> {
+    clearInterval(this._timeout as ReturnType<typeof setInterval>);
 
     try {
       await fs.writeFile(
@@ -174,7 +175,7 @@ export class GPIOPort extends EventEmitter {
     this._exported = false;
   }
 
-  async read() {
+  async read(): Promise<GPIOValue> {
     if (!(this.exported && this.direction === "in")) {
       throw new InvalidAccessError(
         `The exported must be true and value of direction must be "in".`
@@ -199,7 +200,7 @@ export class GPIOPort extends EventEmitter {
     }
   }
 
-  async write(value: GPIOValue) {
+  async write(value: GPIOValue): Promise<void> {
     if (!(this.exported && this.direction === "out")) {
       throw new InvalidAccessError(
         `The exported must be true and value of direction must be "out".`
@@ -231,6 +232,8 @@ export class OperationError extends Error {
   }
 }
 
+// Web GPIOの仕様に基づく意図的なasync関数の使用なので、ルールを無効化
+// eslint-disable-next-line
 export async function requestGPIOAccess(): Promise<GPIOAccess> {
   const ports = new GPIOPortMap(
     [...Array(GPIOPortMapSizeMax).keys()].map(portNumber => [
diff --git a/package.json b/package.json
index 1ad2b38..c25c97d 100644
--- a/package.json
+++ b/package.json
@@ -15,10 +15,14 @@
   "license": "MIT",
   "devDependencies": {
     "@types/node": "^14.14.25",
-    "typescript": "^4.1.3"
+    "@typescript-eslint/eslint-plugin": "^4.15.0",
+    "@typescript-eslint/parser": "^4.15.0",
+    "eslint": "^7.20.0",
+    "typescript": "^4.1.5"
   },
   "scripts": {
     "build": "tsc",
+    "lint": "eslint index.ts",
     "prepare": "rm -rf dist && npm run build"
   },
   "keywords": [
diff --git a/tsconfig.eslint.json b/tsconfig.eslint.json
new file mode 100644
index 0000000..fb9dbd4
--- /dev/null
+++ b/tsconfig.eslint.json
@@ -0,0 +1,11 @@
+{
+  "extends": "./tsconfig.json",
+  "include": [
+    "*.ts",
+    ".eslintrc.js"
+  ],
+  "exclude": [
+    "node_modules",
+    "dist"
+  ]
+}
\ No newline at end of file