jodit/src/core/decorators/cache.ts

Jodit is awesome and usefully wysiwyg editor with filebrowser

/*!
 * Jodit Editor (https://xdsoft.net/jodit/)
 * Released under MIT see LICENSE.txt in the project root for license information.
 * Copyright (c) 2013-2020 Valeriy Chupurnov. All rights reserved. https://xdsoft.net
 */

import { error } from '../helpers';

export interface CachePropertyDescriptor<T, R> extends PropertyDescriptor {
	get?: (this: T) => R;
}

export function cache<T, R>(
	target: any,
	name: PropertyKey,
	descriptor: CachePropertyDescriptor<T, R>
): void {
	const getter = descriptor.get;

	if (!getter) {
		throw error('Getter property descriptor expected');
	}

	descriptor.get = function(this: T) {
		const value = getter.call(this);

		Object.defineProperty(this, name, {
			configurable: descriptor.configurable,
			enumerable: descriptor.enumerable,
			writable: false,
			value
		});

		return value;
	};
}