tsconfig.json

{
  "include": ["**/*.ts"],
  "compilerOptions": {
    "esModuleInterop": true,
    "target": "es2017",
    "verbatimModuleSyntax": true,
    "forceConsistentCasingInFileNames": true,
    "strict": true,
    "noImplicitAny": true,
    "strictNullChecks": true,
    "strictFunctionTypes": true,
    "strictBindCallApply": true,
    "strictPropertyInitialization": true,
    "noImplicitThis": true,
    "useUnknownInCatchVariables": true,
    "noUnusedLocals": true,
    "noImplicitReturns": true,
    "noFallthroughCasesInSwitch": true,
    "noImplicitOverride": true,
    "moduleResolution": "Node",
    // Need to skip lib checks because protobuf.js generates a weak type that proto2 TestMessage implements
    // but the implementing class adds its own properties, so the lack of overlap causes TypeScript weak
    // type detection to fail.  See IMessageSetCorrect for the code.
    // https://github.com/protobufjs/protobuf.js/issues/1559
    "skipLibCheck": true,
    "lib": [
      "ES2016",
      // ES2020.BigInt for the bigint representation of 64-bit integers
      "ES2020.BigInt"
    ]
  }
}