tsconfig.json

{
  "$schema": "https://json.schemastore.org/tsconfig",
  "compilerOptions": {
    "target": "ES2022",
    "module": "NodeNext",
    "lib": ["es2023", "dom"],
    "baseUrl": "./",
    "skipLibCheck": true,

    "moduleResolution": "Node16",
    "outDir": "./lib",
    "sourceMap": true,

    "declaration": true,
    "declarationDir": "./lib/types",
    "declarationMap": true,

    // Use old decorators for the moment
    // That is what lit recommends in https://lit.dev/docs/components/decorators/#compiler-output-considerations
    // Also, it does not work out of the box with vitejs
    "experimentalDecorators": true,

    // Since we don't use standard decorators and accessor keyword we need this
    // See https://lit.dev/docs/components/properties/#avoiding-issues-with-class-fields
    "useDefineForClassFields": false,

    "forceConsistentCasingInFileNames": true,

    "strict": true,
    "noImplicitAny": true,
    "strictNullChecks": false,
    "strictFunctionTypes": true,
    "strictPropertyInitialization": false,
    "noImplicitThis": true,
    "alwaysStrict": true,

    "noUnusedLocals": true,
    "noUnusedParameters": true,
    "noImplicitReturns": true,
    "noFallthroughCasesInSwitch": true,

    "resolveJsonModule": true
  },
  "include": ["test/**/*.js", "src/**/*"],
  "typeAcquisition": {
    "enable": false
  }
}