New flag [`--strictPropertyInitialization`](https://github.com/Microsoft/TypeScript/pull/20075): * [x] Add to MSBuild targets * [x] Add to compiler options documentation and MSBuild documentation * [x] Update schema store New flag [`--ESModuleInterop`](https://github.com/Microsoft/TypeScript/pull/19675) * [x] Add to MSBuild targets * [x] Add to compiler options documentation and MSBuild documentation * [x] Update schema store New `--target ES2018` * [x] new library file es2018 * [x] new library files esNext.array and esNext.promise
New flag
--strictPropertyInitialization:New flag
--ESModuleInteropNew
--target ES2018