ESlint for TypeScript


Based on video course [FrontendMasters] Production-Grade TypeScript


Configured project :
https://github.com/mike-north/professional-ts-my-lib


$ npm install --save-dev \
    @typescript-eslint/eslint-plugin \
    @typescript-eslint/parser \
    eslint


// Generate eslint config if needed
// $ ./node_modules/.bin/eslint --init



.eslintrc.json

$ vi .eslintrc.json


{
  "env": { "node": true },
  "parser": "@typescript-eslint/parser",
  "parserOptions": {
    "ecmaVersion": 2020,
    "project": "tsconfig.eslint.json"
  },
  "extends": [
    "eslint:recommended",
    "plugin:@typescript-eslint/recommended",
    "plugin:@typescript-eslint/recommended-requiring-type-checking"
  ],
  "plugins": ["@typescript-eslint"],
  "rules": {
    "prefer-const": "error",
    "@typscript-eslint/no-unused-vars": "off",
    "@typscript-eslint/no-unused-params": "off"
  },
  "overrides": [
    {
      "files": ["tests/**/*.ts"],
      "env": { "jest": true, "node": true }
    }
  ]
}


no-unused-vars, no-unused-params - are specified in tsconfig already


tsconfig.eslint.json


{
  "extends": "./tsconfig.json",
  "compilerOptions": {
    "types": ["jest"]
  },
  "include": ["src", "tests"]
}


.eslintignore


/node_modules/
/build/


ESLint Plugin TypeScript
https://github.com/typescript-eslint/typescript-eslint/blob/master/packages/eslint-plugin/README.md