Lint your project with the command npm run lint


"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",
// ...


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


// ...
"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.

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