| 1 | /**
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| 2 | * @license
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| 3 | * Copyright Google Inc. All Rights Reserved.
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| 4 | *
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| 5 | * Use of this source code is governed by an MIT-style license that can be
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| 6 | * found in the LICENSE file at https://angular.io/license
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| 7 | */
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| 8 | import { __extends } from "tslib";
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| 9 | /**
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| 10 | * Creates a token that can be used in a DI Provider.
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| 11 | *
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| 12 | * ### Example ([live demo](http://plnkr.co/edit/Ys9ezXpj2Mnoy3Uc8KBp?p=preview))
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| 13 | *
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| 14 | * ```typescript
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| 15 | * var t = new OpaqueToken("value");
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| 16 | *
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| 17 | * var injector = Injector.resolveAndCreate([
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| 18 | * {provide: t, useValue: "bindingValue"}
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| 19 | * ]);
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| 20 | *
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| 21 | * expect(injector.get(t)).toEqual("bindingValue");
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| 22 | * ```
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| 23 | *
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| 24 | * Using an `OpaqueToken` is preferable to using strings as tokens because of possible collisions
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| 25 | * caused by multiple providers using the same string as two different tokens.
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| 26 | *
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| 27 | * Using an `OpaqueToken` is preferable to using an `Object` as tokens because it provides better
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| 28 | * error messages.
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| 29 | * @deprecated since v4.0.0 because it does not support type information, use `InjectionToken<?>`
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| 30 | * instead.
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| 31 | */
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| 32 | var OpaqueToken = /** @class */ (function () {
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| 33 | function OpaqueToken(_desc) {
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| 34 | this._desc = _desc;
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| 35 | }
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| 36 | OpaqueToken.prototype.toString = function () {
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| 37 | return "Token " + this._desc;
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| 38 | };
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| 39 | return OpaqueToken;
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| 40 | }());
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| 41 | export { OpaqueToken };
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| 42 | /**
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| 43 | * Creates a token that can be used in a DI Provider.
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| 44 | *
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| 45 | * Use an `InjectionToken` whenever the type you are injecting is not reified (does not have a
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| 46 | * runtime representation) such as when injecting an interface, callable type, array or
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| 47 | * parametrized type.
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| 48 | *
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| 49 | * `InjectionToken` is parameterized on `T` which is the type of object which will be returned by
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| 50 | * the `Injector`. This provides additional level of type safety.
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| 51 | *
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| 52 | * ```
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| 53 | * interface MyInterface {...}
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| 54 | * var myInterface = injector.get(new InjectionToken<MyInterface>('SomeToken'));
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| 55 | * // myInterface is inferred to be MyInterface.
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| 56 | * ```
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| 57 | *
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| 58 | * ### Example
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| 59 | *
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| 60 | * {@example core/di/ts/injector_spec.ts region='InjectionToken'}
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| 61 | *
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| 62 | * @stable
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| 63 | */
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| 64 | var InjectionToken = /** @class */ (function (_super) {
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| 65 | __extends(InjectionToken, _super);
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| 66 | function InjectionToken(desc) {
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| 67 | return _super.call(this, desc) || this;
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| 68 | }
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| 69 | InjectionToken.prototype.toString = function () {
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| 70 | return "InjectionToken " + this._desc;
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| 71 | };
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| 72 | return InjectionToken;
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| 73 | }(OpaqueToken));
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| 74 | export { InjectionToken };
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| 75 | //# sourceMappingURL=injection_token.js.map |
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