jsconfig.json

{
  "compilerOptions": {
    "moduleResolution": "Node",
    "target": "ESNext",
    "module": "ESNext",
    /**
     * svelte-preprocess cannot figure out whether you have
     * a value or a type, so tell TypeScript to enforce using
     * `import type` instead of `import` for Types.
     */
    // "importsNotUsedAsValues": "error",
    "isolatedModules": true,
    "resolveJsonModule": true,
    /**
     * To have warnings / errors of the Svelte compiler at the
     * correct position, enable source maps by default.
     */
    "sourceMap": true,
    "esModuleInterop": true,
    "skipLibCheck": true,
    "forceConsistentCasingInFileNames": true,
    /**
     * Typecheck JS in `.svelte` and `.js` files by default.
     * Disable this if you'd like to use dynamic types.
     */
    "checkJs": true,
    // Strict checks
    "strict": true,
    // https://stackoverflow.com/q/54659978
    // https://github.com/vitejs/vite/issues/9539
    "types": ["node", "vite/client"],
    /**
     * Resolve `$lib` in source. The same path has to be defined in `vite.config.js`
     */
    "baseUrl": ".",
    "paths": {
      "$lib": ["src/lib"],
      "$lib/*": ["src/lib/*"]
    }
  },
  /**
   * Use global.d.ts instead of compilerOptions.types
   * to avoid limiting type declarations.
   */
  "include": ["src/**/*.d.ts", "src/**/*.js", "src/**/*.svelte"]
}