New project setup #

Node.js, TypeScript, tsx, eslint, prettier #

npm init
npm i typescript tsx prettier @types/node @tsconfig/strictest eslint-config-prettier --save-dev
npx tsc --init --noEmit
npm init @eslint/config@latest

Do the following changes in eslint.config.mjs

import eslintConfigPrettier from "eslint-config-prettier";

export default [
  // ...
  tseslint.configs.strictTypeChecked,
  eslintConfigPrettier,
  {
    languageOptions: {
      parserOptions: {
        projectService: true,
        tsconfigRootDir: import.meta.dirname,
      },
    },
  }
];

.prettierrc contents

{
  "singleQuote": true
}

package.json scripts

{
  "scripts": {
    "test": "tsx --test",
    "lint": "eslint",
    "compile": "tsc --noEmit",
    "start": "tsx index.ts"
  }
}

tsconfig.json changes

{
  "compilerOptions": {
    "...": "",
    "checkJs": false
  },
  "extends": "@tsconfig/strictest/tsconfig.json"
}

Webstorm settings #

Run prettier on save