Establish code style and fix errors in existing codebase (algorand#299)

Co-authored-by: John Lee <[email protected]>

Author: jdtzmn

.editorconfig

@@ -0,0 +1,18 @@
+# top-most EditorConfig file
+root = true
+
+# Unix-style newlines with a newline ending every file
+[*]
+end_of_line = lf
+insert_final_newline = true
+
+# Set JavaScript file rules
+[*.js]
+charset = utf-8
+indent_style = space
+indent_size = 2
+
+# Matches the exact files either package.json or .travis.yml
+[{package.json,.travis.yml}]
+indent_style = space
+indent_size = 2

.eslintrc.js

@@ -0,0 +1,25 @@
+module.exports = {
+  env: {
+    browser: true,
+    es2021: true,
+    node: true,
+    mocha: true,
+  },
+  extends: ['airbnb-base', 'prettier'],
+  parser: '@typescript-eslint/parser',
+  parserOptions: {
+    ecmaVersion: 12,
+  },
+  plugins: ['@typescript-eslint'],
+  rules: {
+    'no-restricted-syntax': ['error', 'LabeledStatement', 'WithStatement'],
+    'no-plusplus': ['error', { allowForLoopAfterthoughts: true }],
+    'max-classes-per-file': 'off',
+  },
+  ignorePatterns: [
+    'dist/',
+    'tests/cucumber/features/',
+    'tests/cucumber/build/',
+    'tests/browser/bundle.*',
+  ],
+};

.gitignore

@@ -1,7 +1,9 @@
 .DS_Store
 
 .idea/
-.vscode
+.vscode/*
+!.vscode/settings.json
+!.vscode/extensions.json
 
 # npm
 node_modules/
@@ -16,3 +18,6 @@ examples/.env
 tests/cucumber/features/
 tests/cucumber/browser/build
 tests/browser/bundle.*
+
+# Caches
+.eslintcache

.huskyrc.js

@@ -0,0 +1,5 @@
+module.exports = {
+  hooks: {
+    'pre-commit': 'lint-staged',
+  },
+};

.lintstagedrc.js

@@ -0,0 +1,4 @@
+module.exports = {
+  '*.{js,ts,md,json,yml}': 'prettier --write',
+  '*.{js,ts}': 'eslint --cache --fix',
+};

.prettierignore

@@ -0,0 +1,4 @@
+dist
+tests/cucumber/features
+tests/cucumber/browser/build
+tests/browser/bundle.*

.prettierrc.json

@@ -0,0 +1,3 @@
+{
+  "singleQuote": true
+}

.travis.yml

@@ -2,7 +2,7 @@ dist: bionic
 language: node_js
 
 node_js:
-  - "12"
+  - '12'
 
 script:
   - set -e
@@ -12,6 +12,11 @@ script:
 
 jobs:
   include:
+    - stage: Code Style
+      name: ESLint
+      script: npm run lint
+    - name: Prettier
+      script: prettier --check .
     - stage: Testing
       name: Node test
     - name: Chrome test

.vscode/extensions.json

@@ -0,0 +1,3 @@
+{
+  "recommendations": ["esbenp.prettier-vscode", "dbaeumer.vscode-eslint"]
+}

.vscode/settings.json

@@ -0,0 +1,6 @@
+{
+  "editor.defaultFormatter": "esbenp.prettier-vscode",
+  "editor.formatOnSave": true,
+  "editor.formatOnPaste": true,
+  "eslint.validate": ["typescript"]
+}