tsconfig.json

// tsconfig.json
{
  "compilerOptions": {
    // ------------------ Compilation Targets ------------------
    "target": "ES2020" /* Compile to modern JS. Rollup handles the final bundle format. */,
    "module": "ESNext" /* Use modern ES module format. */,
    "moduleResolution": "node" /* Standard module resolution. */,
    "allowSyntheticDefaultImports": true /* Allows default imports from modules with no default export. */,
    "esModuleInterop": true /* Compatibility for CommonJS imports (like Lit/MWC modules). */,
    "lib": [
      "ES2020",
      "DOM"
    ] /* Include modern JS features and browser DOM APIs. */,

    // ------------------ Output and Source Maps ------------------
    "sourceMap": true /* Generate source map files. */,
    "rootDir": "src" /* Specify the root directory of source files. */,

    // ------------------ Type Checking and Strictness ------------------
    "strict": true /* Enable all strict type-checking options. Highly recommended. */,
    "skipLibCheck": true /* Skip type checking of declaration files (faster compilation). */
  },
  "include": [
    "src/**/*.ts" /* Only include TypeScript files in the src folder. */,
    "src/**/*.d.ts" // ⬅️ Ensure .d.ts files are included
  ]
}