Eslint + Prettier configuration for Typescript 3.7+ (2020)

eslint-typescript.md

Eslint + Prettier configuration for Typescript 3.7+ (2020)

1. Install required dependencies

npm install --save-dev @typescript-eslint/eslint-plugin @typescript-eslint/parser eslint eslint-config-prettier eslint-config-standard eslint-plugin-import eslint-plugin-node eslint-plugin-prettier eslint-plugin-promise eslint-plugin-react eslint-plugin-standard prettier

# OR

yarn add -D @typescript-eslint/eslint-plugin @typescript-eslint/parser eslint eslint-config-prettier eslint-config-standard eslint-plugin-import eslint-plugin-node eslint-plugin-prettier eslint-plugin-promise eslint-plugin-react eslint-plugin-standard prettier

2. Setup your .eslintrc config file

{
  "rules": {
    "@typescript-eslint/ban-ts-ignore": ["off"],
    "@typescript-eslint/camelcase": ["off"],
    "@typescript-eslint/explicit-function-return-type": ["off"],
    "@typescript-eslint/interface-name-prefix": ["off"],
    "@typescript-eslint/no-explicit-any": ["off"],
    "@typescript-eslint/no-unused-expressions": ["off"],
    "@typescript-eslint/no-var-requires": ["off"],
    "@typescript-eslint/no-use-before-define": ["off"],
    "comma-dangle": ["error", "always-multiline"],
    "no-async-promise-executor": ["off"],
    "no-empty-pattern": ["off"],
    "no-undef": ["error"],
    "no-var": ["error"],
    "object-curly-spacing": ["error", "always"],
    "quotes": ["error", "double", { "allowTemplateLiterals": true }],
    "semi": ["error", "always"],
    "spaced-comment": ["off"],
    "no-prototype-builtins": ["off"],
    "sort-keys": ["off"],
    "space-before-function-paren": ["off"],
    "indent": ["off"],
  },
  "env": {
    "browser": true,
    "es6": true
  },
  "extends": [
    "standard",
    "eslint:recommended",
    "plugin:@typescript-eslint/eslint-recommended",
    "plugin:@typescript-eslint/recommended"
  ],
  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "ecmaVersion": 2018,
    "sourceType": "module"
  },
  "plugins": ["prettier", "@typescript-eslint"]
}

3. Add the following lint script to package.json

{
"scripts": {
    "lint": "eslint -c './.eslintrc' --fix './src/**/*.ts'",
  },
}

4. (optional) Setup .prettierc for prettier-vscode extension

{
  "tabWidth": 2,
  "useTabs": false,
  "trailingComma": "all",
  "printWidth": 100
}