tsconfig.json

{
  "extends": "@tsconfig/svelte/tsconfig.json",
  "compilerOptions": {
    "target": "esnext",
    "useDefineForClassFields": true,
    "module": "esnext",
    "resolveJsonModule": true,
    "baseUrl": ".",
    "strict": true,
    /**
     * Typecheck JS in `.svelte` and `.js` files by default.
     * Disable checkJs if you'd like to use dynamic types in JS.
     * Note that setting allowJs false does not prevent the use
     * of JS in `.svelte` files.
     */
    "allowJs": true,
    "checkJs": true
  },
  "include": [
    "src/**/*.d.ts",
    "src/**/*.ts",
    "src/**/*.js",
    "src/**/*.svelte",
  ],
  "references": [{ "path": "./tsconfig.node.json" }]
}