tsconfig.json

{
  "compilerOptions": {
    "baseUrl": ".",
    "module": "esnext",
    "moduleResolution": "NodeNext",
    "resolveJsonModule": true,
    "types": [
      "svelte"
    ],
    "target": "ES2020",
    "lib": ["ES2021", "DOM"],
    /**
      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",
    /**
      TypeScript doesn't know about import usages in the template because it only sees the
      script of a Svelte file. Therefore preserve all value imports. Requires TS 4.5 or higher.
     */
    "preserveValueImports": true,
    "isolatedModules": true,
    /**
      To have warnings/errors of the Svelte compiler at the correct position,
      enable source maps by default.
     */
    "sourceMap": true,
    "strict": false,
    "esModuleInterop": true,
    "forceConsistentCasingInFileNames": true,
    /* Emit */
    "declaration": true,
    "declarationMap": true,
    "outDir": "dist",
    /* Completeness */
    "skipLibCheck": true
  },
  "include": [
    "src"
  ],
  "exclude": [
    "dist"
  ]
}