Initializing new TypeScript project

.eslintignore

# don't ever lint node_modules
node_modules
# don't lint build output (make sure it's set to your correct build folder name)
dist
# don't lint nyc coverage output
coverage

.eslintrc.js

module.exports = {
  root: true,
  parser: '@typescript-eslint/parser',
  parserOptions: {
    tsconfigRootDir: __dirname,
    project: ['./tsconfig.json'],
  },
  plugins: ['@typescript-eslint'],
  extends: [
    'eslint:recommended',
    'plugin:@typescript-eslint/recommended',
    'plugin:@typescript-eslint/recommended-requiring-type-checking',
    'prettier',
    'prettier/@typescript-eslint',
  ],
  rules: {
    '@typescript-eslint/explicit-module-boundary-types': 'off',
    '@typescript-eslint/ban-types': [
      'error',
      {
        extendDefaults: true,
        types: {
          object: false,
        },
      },
    ],
  },
}

.gitignore

node_modules
*.log*
/dist
*.tgz
/coverage

.huskyrc

{
  "hooks": {
    "pre-commit": "npx lint-staged"
  }
}

.lintstagedrc

{
  "*.{js,ts,tsx,json,css,scss,less,yml}": [
    "npx prettier --write",
  ],
  "*.md": [
    "npx doctoc",
    "npx prettier --write",
  ]
}

.npmignore

node_modules
*.log*
/src
/tsconfig*
/tslint*
/index.ts
.prettierignore
.vscode
*.tgz
/coverage

.prettierrc

{
  "trailingComma": "all",
  "semi": false,
  "singleQuote": true,
  "arrowParens": "always",
  "printWidth": 140
}

.travis.yml

language: node_js
node_js:
  - 'lts/*'
script:
  - npm run lint
  - npm test
sudo: false
after_success:
  - npm run coverage-report
  

init.sh

npm i -D typescript eslint @typescript-eslint/parser @typescript-eslint/eslint-plugin eslint-config-prettier prettier husky lint-staged doctoc jest @types/jest ts-jest shx coveralls

jest.config.js

module.exports = {
  roots: ['<rootDir>'],
  transform: {
    '^.+\\.tsx?$': 'ts-jest',
  },
  testRegex: '^.+\\.(test|spec)\\.tsx?$',
  moduleFileExtensions: ['ts', 'tsx', 'js', 'jsx', 'json', 'node'],
  restoreMocks: true,
  collectCoverage: true,
  coveragePathIgnorePatterns: ['<rootDir>/dist/', '<rootDir>/node_modules/'],
  coverageThreshold: {
    global: {
      branches: 80,
      functions: 80,
      lines: 80,
      statements: 80,
    },
  },
}

package.json

...
"scripts": {
  "test": "npx jest",
  "compile": "npx shx rm -rf dist && npx tsc -p tsconfig.prod.json",
  "lint": "npx eslint --ext .ts,.tsx .",
  "prepack": "npm run compile",
  "coverage-report": "npx shx cat coverage/lcov.info | coveralls"
},
...

tsconfig.json

{
  "compilerOptions": {
    "alwaysStrict": true,
    "strict": true,
    "noUnusedLocals": true,
    "noFallthroughCasesInSwitch": true,
    "target": "es2015",
    "baseUrl": "./",
    "moduleResolution": "node",
    "declaration": true,
    "removeComments": true,
    "module": "commonjs",
    "experimentalDecorators": true,
    "emitDecoratorMetadata": true,
    "esModuleInterop": true
  },
  "include": ["./**/*.ts"]
}

tsconfig.prod.json

{
  "extends": "./tsconfig.json",
  "compilerOptions": {
    "outDir": "./dist"
  },
  "include": ["./index.ts"]
}