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
    },
    /**
    * Use global.d.ts instead of compilerOptions.types
    * to avoid limiting type declarations.
    */
    "include": ["src/**/*.d.ts", "src/**/*.js", "src/**/*.svelte"]
}