57 lines
2.1 KiB
TypeScript
57 lines
2.1 KiB
TypeScript
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/**
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* @license
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* Copyright Google Inc. All Rights Reserved.
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*
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* Use of this source code is governed by an MIT-style license that can be
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* found in the LICENSE file at https://angular.io/license
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*/
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/**
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* Most of the use of `document` in Angular is from within the DI system so it is possible to simply
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* inject the `DOCUMENT` token and are done.
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*
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* Ivy is special because it does not rely upon the DI and must get hold of the document some other
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* way.
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*
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* The solution is to define `getDocument()` and `setDocument()` top-level functions for ivy.
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* Wherever ivy needs the global document, it calls `getDocument()` instead.
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*
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* When running ivy outside of a browser environment, it is necessary to call `setDocument()` to
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* tell ivy what the global `document` is.
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*
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* Angular does this for us in each of the standard platforms (`Browser`, `Server`, and `WebWorker`)
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* by calling `setDocument()` when providing the `DOCUMENT` token.
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*/
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let DOCUMENT: Document|undefined = undefined;
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/**
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* Tell ivy what the `document` is for this platform.
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*
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* It is only necessary to call this if the current platform is not a browser.
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*
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* @param document The object representing the global `document` in this environment.
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*/
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export function setDocument(document: Document | undefined): void {
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DOCUMENT = document;
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}
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/**
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* Access the object that represents the `document` for this platform.
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*
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* Ivy calls this whenever it needs to access the `document` object.
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* For example to create the renderer or to do sanitization.
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*/
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export function getDocument(): Document {
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if (DOCUMENT !== undefined) {
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return DOCUMENT;
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} else if (typeof document !== 'undefined') {
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return document;
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}
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// No "document" can be found. This should only happen if we are running ivy outside Angular and
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// the current platform is not a browser. Since this is not a supported scenario at the moment
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// this should not happen in Angular apps.
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// Once we support running ivy outside of Angular we will need to publish `setDocument()` as a
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// public API. Meanwhile we just return `undefined` and let the application fail.
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return undefined !;
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}
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