@webqit/observer/src/core/Descriptor.js

A simple set of functions for intercepting and observing JavaScript objects and arrays.

/**
 * ---------------------------
 * The Descriptor class
 * ---------------------------
 */

export default class Descriptor {

	/**
	 * Initializes the instance.
	 *
	 * @param array|object	target
	 * @param object		dfn
	 *
	 * @return void
	 */
	constructor(target, dfn) {
		this.target = target;
		if (!(dfn.operation)) throw new Error('Descriptor operation must be given in definition!');
		Object.assign(this, dfn);
	}

	get [Symbol.toStringTag]() {
		return 'Descriptor';
	}

	static [Symbol.hasInstance](instance) {
		return instance?.[Symbol.toStringTag] === 'Descriptor'
			&& instance.operation
	}
}