a7e1f236ff525a93146d47f0886d1f6ac329ede2

- updates tests - heavy prose revisions - uses HttpClient (with angular-in-memory-web-api) - test HeroService using `HttpClientTestingModule` - scrub away most By.CSS - fake async observable with `asyncData()` - extensive Twain work - different take on retryWhen - remove app barrels (& systemjs.extras) which troubled plunker/systemjs - add dummy export const to hero.ts (plunkr/systemjs fails w/o it) - shrink and re-organize TOC - add marble testing package and tests - demonstrate the "no beforeEach()" test coding style - add section on Http service testing - prepare for stackblitz - confirm works in plunker except excluded marble test - add tests for avoidFile class feature of CodeExampleComponent PR Close #20697
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Description
Languages
TypeScript
86.3%
JavaScript
8.5%
HTML
1.8%
Starlark
1.7%
CSS
1%
Other
0.6%