DetachArrayBuffer.js

'use strict';

var GetIntrinsic = require('get-intrinsic');

var $SyntaxError = GetIntrinsic('%SyntaxError%');
var $TypeError = GetIntrinsic('%TypeError%');

var isArrayBuffer = require('is-array-buffer');
var isSharedArrayBuffer = require('is-shared-array-buffer');

var MessageChannel;
try {
	// eslint-disable-next-line global-require
	MessageChannel = require('worker_threads').MessageChannel;
} catch (e) { /**/ }

// https://262.ecma-international.org/9.0/#sec-detacharraybuffer

/* globals postMessage */

module.exports = function DetachArrayBuffer(arrayBuffer) {
	if (!isArrayBuffer(arrayBuffer) || isSharedArrayBuffer(arrayBuffer)) {
		throw new $TypeError('Assertion failed: `arrayBuffer` must be an Object with an [[ArrayBufferData]] internal slot, and not a Shared Array Buffer');
	}

	// commented out since there's no way to set or access this key
	// var key = arguments.length > 1 ? arguments[1] : void undefined;

	// if (!SameValue(arrayBuffer[[ArrayBufferDetachKey]], key)) {
	// 	throw new $TypeError('Assertion failed: `key` must be the value of the [[ArrayBufferDetachKey]] internal slot of `arrayBuffer`');
	// }

	if (typeof structuredClone === 'function') {
		structuredClone(arrayBuffer, { transfer: [arrayBuffer] });
	} else if (typeof postMessage === 'function') {
		postMessage('', '/', [arrayBuffer]); // TODO: see if this might trigger listeners
	} else if (MessageChannel) {
		(new MessageChannel()).port1.postMessage(null, [arrayBuffer]);
	} else {
		throw new $SyntaxError('DetachArrayBuffer is not supported in this environment');
	}
	return null;
};