33 lines
741 B
Plaintext
33 lines
741 B
Plaintext
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p.location-badge.
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exported from <a href="/angular2/di_annotations.html">angular2/di_annotations</a>
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defined in <a href="https://github.com/angular/angular/tree/master/modules/angular2/src/di/annotations_impl.js#L77">angular2/src/di/annotations_impl.js (line 77)</a>
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:markdown
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A parameter annotation that marks a dependency as optional. <a href='../di/Injector-class.html'><code>Injector</code></a> provides `null` if the dependency is not
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found.
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```
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class AComponent {
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constructor(@Optional() aService:MyService) {
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this.aService = aService;
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}
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}
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```
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.l-main-section
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h2 Members
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.l-sub-section
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h3 constructor
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pre.prettyprint
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code.
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constructor()
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:markdown
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