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docs: Improve docs for downgrading a service (#19371) 

PR Close #19371
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Bert Verhelst 2018-05-23 10:27:27 +02:00 committed by Jason Aden
parent 831e71ea3c
commit 69b57b2dca
1 changed files with 11 additions and 2 deletions
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aio/content/guide/upgrade.md
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@ -778,16 +778,25 @@ delete them once the upgrade is over.
It's also recommended to export the `heroesServiceFactory` function so that Ahead-of-Time
compilation can pick it up.
<div class="alert is-helpful">
**Note:** The 'heroes' string inside the factory refers to the AngularJS `HeroesService`.
It is common in AngularJS apps to choose a service name for the token, for example "heroes",
and append the "Service" suffix to create the class name.
</div>
<code-example path="upgrade-module/src/app/ajs-to-a-providers/ajs-upgraded-providers.ts" title="ajs-upgraded-providers.ts">
</code-example>
You can then provide the service to Angular by adding it to the `@NgModule`:
<code-example path="upgrade-module/src/app/ajs-to-a-providers/app.module.ts" region="register" title="app.module.ts">
</code-example>
You can then inject it in Angular using its class as a type annotation:
Then use the service inside your component by injecting it in the component constructor using its class as a type annotation:
<code-example path="upgrade-module/src/app/ajs-to-a-providers/hero-detail.component.ts" title="hero-detail.component.ts">
</code-example>
<div class="alert is-helpful">