Add linting config for TypeScript

Author: heyhippari

.eslintignore

@@ -0,0 +1,3 @@
+node_modules
+dist
+coverage

.eslintrc.yml

@@ -2,12 +2,22 @@ env:
   es6: true
   browser: true
 
+parser: '@typescript-eslint/parser'
+
 extends:
   - "eslint:recommended"
+  - 'plugin:@typescript-eslint/eslint-recommended'
+  - 'plugin:@typescript-eslint/recommended'
+  - 'plugin:@typescript-eslint/recommended-requiring-type-checking'
+
+plugins:
+  - '@typescript-eslint'
 
 parserOptions:
   ecmaVersion: 6
   sourceType: module
+  tsconfigRootDir: '.'
+  project: ['./tsconfig.json']
 
 overrides:
   - files:

package.json

@@ -8,6 +8,8 @@
     "@babel/core": "^7.2.2",
     "@babel/preset-env": "^7.9.0",
     "@babel/preset-typescript": "^7.9.0",
+    "@typescript-eslint/eslint-plugin": "^2.25.0",
+    "@typescript-eslint/parser": "^2.25.0",
     "babel-jest": "^25.1.0",
     "babel-loader": "^8.0.5",
     "eslint": "^6.8.0",