jsconfig.json

{
    "compilerOptions": {
        "moduleResolution": "bundler",
        "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.
        */
        "verbatimModuleSyntax": true,
        "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,
        /**
        * 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/**/*.ts",
        "src/**/*.js",
        "src/**/*.svelte" 
    ]
}