/**
 * @license
 * Copyright Google Inc. All Rights Reserved.
 *
 * Use of this source code is governed by an MIT-style license that can be
 * found in the LICENSE file at https://angular.io/license
 */
/**
 * Creates a token that can be used in a DI Provider.
 *
 * ### Example ([live demo](http://plnkr.co/edit/Ys9ezXpj2Mnoy3Uc8KBp?p=preview))
 *
 * ```typescript
 * var t = new OpaqueToken("value");
 *
 * var injector = Injector.resolveAndCreate([
 *   {provide: t, useValue: "bindingValue"}
 * ]);
 *
 * expect(injector.get(t)).toEqual("bindingValue");
 * ```
 *
 * Using an `OpaqueToken` is preferable to using strings as tokens because of possible collisions
 * caused by multiple providers using the same string as two different tokens.
 *
 * Using an `OpaqueToken` is preferable to using an `Object` as tokens because it provides better
 * error messages.
 * @ts2dart_const
 * @stable
 */
export class OpaqueToken {
    constructor(_desc) {
        this._desc = _desc;
    }
    toString() { return `Token ${this._desc}`; }
}
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