eslint setup, prevent dependency cycle, add git hooks & PR checks for TS & lint (#21)

* setup eslint

* lint fix

* remove prettier

* fix ts:check & lint:check

* add pre-commit git hook to check TS & Lint

* add pull_request gh action to check TS & Lint

Author: Egor Mesyats

.eslintignore

@@ -0,0 +1,2 @@
+dist/
+examples/

.eslintrc.js

@@ -0,0 +1,29 @@
+module.exports = {
+  env: {
+    browser: true,
+    es6: true,
+    node: true,
+  },
+  extends: [
+    'airbnb-typescript/base',
+  ],
+  globals: {
+    Atomics: 'readonly',
+    SharedArrayBuffer: 'readonly',
+  },
+  parser: '@typescript-eslint/parser',
+  parserOptions: {
+    ecmaVersion: 2018,
+    sourceType: 'module',
+    project: './tsconfig.json',
+  },
+  plugins: [
+    '@typescript-eslint',
+  ],
+  rules: {
+    'max-len': ['error', { 'code': 120 }],
+    'no-plusplus': ["error", { "allowForLoopAfterthoughts": true }],
+    'no-unused-vars': ["error", { "argsIgnorePattern": "^_" }],
+    '@typescript-eslint/no-unused-vars': ["error", { "argsIgnorePattern": "^_" }],
+  },
+};

.github/workflows/pr-checks.yml

@@ -0,0 +1,14 @@
+name: PR Checks
+
+on:
+  pull_request:
+
+jobs:
+  publish-npm:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v1
+      - uses: actions/setup-node@v1
+      - run: npm ci
+      - run: npm run ts:check
+      - run: npm run lint:check

.huskyrc

@@ -0,0 +1,5 @@
+{
+  "hooks": {
+    "pre-commit": "npm run ts:check && npm run lint:check"
+  }
+}