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A neat way to unsubscribe from observables when the component destroyed

@ngneat/until-destroy npm

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Compatibility with Angular Versions

<table> <thead> <tr> <th>@ngneat/until-destroy</th> <th>Angular</th> </tr> </thead> <tbody> <tr> <td> 8.x </td> <td> >= 10.0.5 < 13 </td> </tr> <tr> <td> 9.x </td> <td> >= 13 </td> </tr> </tbody> </table>

Table of contents

Use with Ivy

npm install @ngneat/until-destroy
# Or if you use yarn
yarn add @ngneat/until-destroy
import { UntilDestroy, untilDestroyed } from '@ngneat/until-destroy';

@UntilDestroy()
@Component({})
export class InboxComponent {
  ngOnInit() {
    interval(1000).pipe(untilDestroyed(this)).subscribe();
  }
}

You can set the checkProperties option to true if you want to unsubscribe from subscriptions properties automatically:

@UntilDestroy({ checkProperties: true })
@Component({})
export class HomeComponent {
  // We'll dispose it on destroy
  subscription = fromEvent(document, 'mousemove').subscribe();
}

You can set the arrayName property if you want to unsubscribe from each subscription in the specified array.

@UntilDestroy({ arrayName: 'subscriptions' })
@Component({})
export class HomeComponent {
  subscriptions = [
    fromEvent(document, 'click').subscribe(),
    fromEvent(document, 'mousemove').subscribe(),
  ];

  // You can still use the operator
  ngOnInit() {
    interval(1000).pipe(untilDestroyed(this));
  }
}

You can set the blackList property if you don't want to unsubscribe from one or more subscriptions.

@UntilDestroy({ checkProperties: true, blackList: ['subscription1'] })
@Component({})
export class HomeComponent {
  // subscription1 will not be unsubscribed upon component destruction
  subscription1: Subscription;
  // subscription2 will be unsubscribed upon component destruction
  subscription2: Subscription;

  constructor() {
    this.subscription1 = new Subject().subscribe();
    this.subscription2 = new Subject().subscribe();
  }
}

Use with Non-Singleton Services

@UntilDestroy()
@Injectable()
export class InboxService {
  constructor() {
    interval(1000).pipe(untilDestroyed(this)).subscribe();
  }
}

@Component({
  providers: [InboxService],
})
export class InboxComponent {
  constructor(inboxService: InboxService) {}
}

All options, described above, are also applicable to providers.

Use with View Engine (Pre Ivy)

npm install ngx-take-until-destroy
# Or if you use yarn
yarn add ngx-take-until-destroy
import { untilDestroyed } from 'ngx-take-until-destroy';

@Component({})
export class InboxComponent implements OnDestroy {
  ngOnInit() {
    interval(1000)
      .pipe(untilDestroyed(this))
      .subscribe(val => console.log(val));
  }

  // This method must be present, even if empty.
  ngOnDestroy() {
    // To protect you, we'll throw an error if it doesn't exist.
  }
}

Use with Any Class

import { untilDestroyed } from 'ngx-take-until-destroy';

export class Widget {
  constructor() {
    interval(1000).pipe(untilDestroyed(this, 'destroy')).subscribe(console.log);
  }

  // The name needs to be the same as the second parameter
  destroy() {}
}

Migration from View Engine to Ivy

To make it easier for you to migrate, we've built a script that will update the imports path and add the decorator for you. The script is shipped as a separate package. Run the following command to install it:

npm i --save-dev @ngneat/until-destroy-migration
# Or if you use yarn
yarn add -D @ngneat/until-destroy-migration

Then run the following command:

npx @ngneat/until-destroy-migration --base my/path

base defaults to ./src/app.

You can use the --removeOnDestroy flag for empty OnDestroy methods removing.

npx @ngneat/until-destroy-migration --removeOnDestroy

You can remove the package once the migration is done.

Potential Pitfalls

ESLint Rules

Contributors ✨

Thanks goes to these wonderful people (emoji key):

<!-- ALL-CONTRIBUTORS-LIST:START - Do not remove or modify this section --> <!-- prettier-ignore-start --> <!-- markdownlint-disable --> <table> <tr> <td align="center"><a href="https://www.netbasal.com"><img src="https://avatars1.githubusercontent.com/u/6745730?v=4" width="100px;" alt=""/><br /><sub><b>Netanel Basal</b></sub></a><br /><a href="https://github.com/ngneat/until-destroy/commits?author=NetanelBasal" title="Code">💻</a> <a href="https://github.com/ngneat/until-destroy/commits?author=NetanelBasal" title="Documentation">📖</a> <a href="#ideas-NetanelBasal" title="Ideas, Planning, & Feedback">🤔</a></td> <td align="center"><a href="https://medium.com/@overthesanity"><img src="https://avatars1.githubusercontent.com/u/7337691?v=4" width="100px;" alt=""/><br /><sub><b>Artur Androsovych</b></sub></a><br /><a href="https://github.com/ngneat/until-destroy/commits?author=arturovt" title="Code">💻</a> <a href="#example-arturovt" title="Examples">💡</a> <a href="#ideas-arturovt" title="Ideas, Planning, & Feedback">🤔</a> <a href="#infra-arturovt" title="Infrastructure (Hosting, Build-Tools, etc)">🚇</a></td> <td align="center"><a href="https://github.com/KrzysztofKarol"><img src="https://avatars3.githubusercontent.com/u/12470911?v=4" width="100px;" alt=""/><br /><sub><b>Krzysztof Karol</b></sub></a><br /><a href="#content-KrzysztofKarol" title="Content">🖋</a></td> <td align="center"><a href="https://github.com/gund"><img src="https://avatars0.githubusercontent.com/u/3644678?v=4" width="100px;" alt=""/><br /><sub><b>Alex Malkevich</b></sub></a><br /><a href="https://github.com/ngneat/until-destroy/commits?author=gund" title="Code">💻</a></td> <td align="center"><a href="https://github.com/webdevius"><img src="https://avatars0.githubusercontent.com/u/2960769?v=4" width="100px;" alt=""/><br /><sub><b>Khaled Shaaban</b></sub></a><br /><a href="https://github.com/ngneat/until-destroy/commits?author=webdevius" title="Code">💻</a></td> <td align="center"><a href="https://github.com/kmathy"><img src="https://avatars3.githubusercontent.com/u/15690980?v=4" width="100px;" alt=""/><br /><sub><b>kmathy</b></sub></a><br /><a href="https://github.com/ngneat/until-destroy/commits?author=kmathy" title="Code">💻</a></td> <td align="center"><a href="https://github.com/FFKL"><img src="https://avatars1.githubusercontent.com/u/11336491?v=4" width="100px;" alt=""/><br /><sub><b>Dmitrii Korostelev</b></sub></a><br /><a href="https://github.com/ngneat/until-destroy/commits?author=FFKL" title="Code">💻</a></td> </tr> </table> <!-- markdownlint-enable --> <!-- prettier-ignore-end --> <!-- ALL-CONTRIBUTORS-LIST:END -->

This project follows the all-contributors specification. Contributions of any kind welcome!