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| Viewing file: Select action/file-type: /**
* @license Copyright (c) 2003-2021, CKSource - Frederico Knabben. All rights reserved.
* For licensing, see LICENSE.md or https://ckeditor.com/legal/ckeditor-oss-license
*/
/**
* @module utils/mix
*/
/**
* Copies enumerable properties and symbols from the objects given as 2nd+ parameters to the
* prototype of first object (a constructor).
*
* class Editor {
* ...
* }
*
* const SomeMixin = {
* a() {
* return 'a';
* }
* };
*
* mix( Editor, SomeMixin, ... );
*
* new Editor().a(); // -> 'a'
*
* Note: Properties which already exist in the base class will not be overriden.
*
* @param {Function} [baseClass] Class which prototype will be extended.
* @param {Object} [...mixins] Objects from which to get properties.
*/
export default function mix( baseClass, ...mixins ) {
mixins.forEach( mixin => {
Object.getOwnPropertyNames( mixin ).concat( Object.getOwnPropertySymbols( mixin ) )
.forEach( key => {
if ( key in baseClass.prototype ) {
return;
}
const sourceDescriptor = Object.getOwnPropertyDescriptor( mixin, key );
sourceDescriptor.enumerable = false;
Object.defineProperty( baseClass.prototype, key, sourceDescriptor );
} );
} );
}
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