Alex Rickabaugh
a7a14df5f8
This commit introduces a new API on `EnvironmentInjector` to run a function
in the context of the injector. This makes `inject()` available within the
body of the function to inject dependencies. We expect this functionality to
be very useful for designing ergonomic APIs both in and out of Angular, as
it should allow for a smaller and more functional API style.
Note that it's possible to implement nearly identical functionality in user
code already today:
```typescript
function runInContext<T>(injector: EnvironmentInjector, fn: () => T): T {
const token = new InjectionToken<T>('TOKEN');
const tmpInjector = createEnvironmentInjector([
{provide: token, useFactory: () => fn()},
], injector);
return tmpInjector.get(token);
}
```
The factory provider for `token` in this example runs in the context of the
`tmpInjector`, giving it access to `inject` that can retrieve values from
`injector` as well. This is nearly identical, although because of the child
injector `self` and `skipSelf` injection options don't function correctly.
PR Close #46653
Angular - The modern web developer's platform.
Angular is a development platform for building mobile and desktop web applications
using Typescript/JavaScript and other languages.
Contributing Guidelines
·
Submit an Issue
·
Blog
Documentation
Get started with Angular, learn the fundamentals and explore advanced topics on our documentation website.
Advanced
Development Setup
Prerequisites
- Install Node.js which includes Node Package Manager
Setting Up a Project
Install the Angular CLI globally:
npm install -g @angular/cli
Create workspace:
ng new [PROJECT NAME]
Run the application:
cd [PROJECT NAME]
ng serve
Angular is cross-platform, fast, scalable, has incredible tooling, and is loved by millions.
Quickstart
Ecosystem
Changelog
Learn about the latest improvements.
Upgrading
Check out our upgrade guide to find out the best way to upgrade your project.
Contributing
Contributing Guidelines
Read through our contributing guidelines to learn about our submission process, coding rules and more.
Want to Help?
Want to report a bug, contribute some code, or improve documentation? Excellent! Read up on our guidelines for contributing and then check out one of our issues labeled as help wanted or good first issue.
Code of Conduct
Help us keep Angular open and inclusive. Please read and follow our Code of Conduct.
Community
Join the conversation and help the community.
Love Angular? Give our repo a star ⭐ ⬆️.