Build cycles are now up to 4x faster thanks to optimizations in the Angular Compatibility Compiler ( ngcc ) and the official move to TypeScript 4.0 .

TSLint and Codelyzer have been officially deprecated . Angular now recommends migrating to the community-driven angular-eslint stack.

Initially introduced for Material, harnesses are now available for all components . New APIs like the parallel function and manualChangeDetection provide finer control over asynchronous testing.