Linting

Lint your project with the command npm run lint

package.json:

"scripts": {
  // ...
  "ts-silent-build": "tsc --project ./tsconfig.json --noEmit",
  "prelint": "npm run ts-silent-build",
  "lint": "eslint . --ext .js,.jsx,.ts,.tsx",
  "prelint-fix": "npm run ts-silent-build",
  "lint-fix": "eslint --fix . --ext .js,.jsx,.ts,.tsx",
  // ...
}

Implementation

HaTs projects are pre-configured to lint using @typescript-eslint/parser.

.eslintrc.json:

{
    // ...
    "parser": "@typescript-eslint/parser",
    "parserOptions": {
        "tsconfigRootDir": ".",
        "project": ["tsconfig.json"]
    }
}

Notice that the parserOptions.project property points to your project's tsconfig.json file. This setting enables your linting process to catch TypeScript warnings and errors, most notably strictNullChecks and noImplicitAny.

Further Reading

• ESLint Documentation