refactor: using typescript

.eslintignore

@@ -1,3 +1,4 @@
 node_modules/
 coverage/
-tmp/
+tmp/
+dist/

.eslintrc.js

@@ -0,0 +1,26 @@
+module.exports = {
+  root: true,
+  env: {
+    commonjs: true,
+    es6: true,
+    node: true
+  },
+  extends: [
+    'standard'
+  ],
+  globals: {
+    Atomics: 'readonly',
+    SharedArrayBuffer: 'readonly'
+  },
+  parser: '@typescript-eslint/parser',
+  parserOptions: {
+    ecmaVersion: 2018
+  },
+  plugins: [
+    '@typescript-eslint'
+  ],
+  rules: {
+    'no-unused-vars': 'off',
+    '@typescript-eslint/no-unused-vars': ['error']
+  }
+}

.github/workflows/nodejs.yml

@@ -0,0 +1,22 @@
+name: Node.js CI
+
+on: [push, pull_request]
+
+jobs:
+  build:
+
+    runs-on: ubuntu-latest
+
+    strategy:
+      matrix:
+        node-version: [10.x, 12.x, 14.x]
+
+    steps:
+    - uses: actions/checkout@v2
+    - name: Use Node.js ${{ matrix.node-version }}
+      uses: actions/setup-node@v1
+      with:
+        node-version: ${{ matrix.node-version }}
+    - run: npm install
+    - run: npm run build --if-present
+    - run: npm run eslint

.gitignore

@@ -5,3 +5,5 @@ tmp/
 .idea/
 .nyc_output/
 package-lock.json
+yarn.lock
+dist

.travis.yml

@@ -6,7 +6,6 @@ cache:
 node_js:
   - "10"
   - "12"
-  - "13"
   - "14"
 
 script: