feat: gh action to run eslint

.eslintrc.js

@@ -0,0 +1,12 @@
+module.exports = {
+  root: true,
+  parser: '@typescript-eslint/parser',
+  plugins: [
+    '@typescript-eslint',
+  ],
+  extends: [
+    'eslint:recommended',
+    'plugin:@typescript-eslint/eslint-recommended',
+    'plugin:@typescript-eslint/recommended',
+  ],
+};

.github/workflows/lint.yml

@@ -0,0 +1,15 @@
+on:
+  pull_request:
+
+jobs:
+  lint:
+    name: lint
+    runs-on: ubuntu-latest
+    steps:
+    - name: nodenv/setup-nodenv
+      uses: nodenv/actions-setup-nodenv@v2.0.4
+    - uses: actions/checkout@v1
+    - name: install eslint
+      run: npm install eslint@6.8.0 @typescript-eslint/parser@2.25.0 @typescript-eslint/eslint-plugin@2.25.0
+    - name: lint
+      run: ./node_modules/.bin/eslint . --ext .ts

package.json

@@ -14,8 +14,7 @@
   },
   "scripts": {
     "build": "tsc && bin/build.js",
-    "test": "npm run lint && jest src/test.js",
-    "lint": "tslint -c tslint.json 'src/index.ts' --fix",
+    "test": "jest src/test.js",
     "test:watch": "npm run test -- --watch"
   },
   "license": "Apache-2.0",
@@ -33,7 +32,6 @@
     "json-schema-ref-parser": "^8.0.0",
     "lodash": "^4.17.11",
     "node-fetch": "^2.3.0",
-    "tslint": "^6.1.0",
     "typescript": "^3.3.3333"
   },
   "keywords": [