@angular/core
Version:
Angular - the core framework
76 lines • 6.11 kB
JavaScript
/**
* @fileoverview added by tsickle
* @suppress {checkTypes,extraRequire,missingOverride,missingReturn,unusedPrivateMembers,uselessCode} checked by tsc
*/
/**
* @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
*/
import { getClosureSafeProperty } from '../util/property';
import { stringify } from '../util/stringify';
/**
* An interface that a function passed into {\@link forwardRef} has to implement.
*
* \@usageNotes
* ### Example
*
* {\@example core/di/ts/forward_ref/forward_ref_spec.ts region='forward_ref_fn'}
* \@publicApi
* @record
*/
export function ForwardRefFn() { }
/** @type {?} */
const __forward_ref__ = getClosureSafeProperty({ __forward_ref__: getClosureSafeProperty });
/**
* Allows to refer to references which are not yet defined.
*
* For instance, `forwardRef` is used when the `token` which we need to refer to for the purposes of
* DI is declared, but not yet defined. It is also used when the `token` which we use when creating
* a query is not yet defined.
*
* \@usageNotes
* ### Example
* {\@example core/di/ts/forward_ref/forward_ref_spec.ts region='forward_ref'}
* \@publicApi
* @param {?} forwardRefFn
* @return {?}
*/
export function forwardRef(forwardRefFn) {
((/** @type {?} */ (forwardRefFn))).__forward_ref__ = forwardRef;
((/** @type {?} */ (forwardRefFn))).toString = (/**
* @return {?}
*/
function () { return stringify(this()); });
return ((/** @type {?} */ ((/** @type {?} */ (forwardRefFn)))));
}
/**
* Lazily retrieves the reference value from a forwardRef.
*
* Acts as the identity function when given a non-forward-ref value.
*
* \@usageNotes
* ### Example
*
* {\@example core/di/ts/forward_ref/forward_ref_spec.ts region='resolve_forward_ref'}
*
* @see `forwardRef`
* \@publicApi
* @template T
* @param {?} type
* @return {?}
*/
export function resolveForwardRef(type) {
/** @type {?} */
const fn = type;
if (typeof fn === 'function' && fn.hasOwnProperty(__forward_ref__) &&
fn.__forward_ref__ === forwardRef) {
return fn();
}
else {
return type;
}
}
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