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,
      "baseUrl": ".",
      /**
       * Typecheck JS in `.svelte` and `.js` files by default.
       * Disable this if you'd like to use dynamic types.
       */
      "checkJs": true
   },
   /**
    * Use global.d.ts instead of compilerOptions.types
    * to avoid limiting type declarations.
    */
   "include": [
      "src/**/*.d.ts",
      "src/**/*.js",
      "src/**/*.svelte"
   ]
}