tsconfig.json

{
  "compilerOptions": {
    "moduleResolution": "node",
    "target": "es2018",
    /**
      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,
    /**
      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": ".",
    "allowJs": true,
    "checkJs": true,
    "paths": {
      "$app/*": [".svelte/dev/runtime/app/*", ".svelte/build/runtime/app/*"],
      "$service-worker": [".svelte/build/runtime/service-worker"],
      "$lib/*": ["src/lib/*"]
    }
  },
  "include": ["src/**/*.d.ts", "src/**/*.js", "src/**/*.ts", "src/**/*.svelte"]
}