package.internals.detach-transferable.js Maven / Gradle / Ivy

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Standard library

There is a newer version: 3.39.0

'use strict';
var global = require('../internals/global');
var tryNodeRequire = require('../internals/try-node-require');
var PROPER_STRUCTURED_CLONE_TRANSFER = require('../internals/structured-clone-proper-transfer');

var structuredClone = global.structuredClone;
var $ArrayBuffer = global.ArrayBuffer;
var $MessageChannel = global.MessageChannel;
var detach = false;
var WorkerThreads, channel, buffer, $detach;

if (PROPER_STRUCTURED_CLONE_TRANSFER) {
  detach = function (transferable) {
    structuredClone(transferable, { transfer: [transferable] });
  };
} else if ($ArrayBuffer) try {
  if (!$MessageChannel) {
    WorkerThreads = tryNodeRequire('worker_threads');
    if (WorkerThreads) $MessageChannel = WorkerThreads.MessageChannel;
  }

  if ($MessageChannel) {
    channel = new $MessageChannel();
    buffer = new $ArrayBuffer(2);

    $detach = function (transferable) {
      channel.port1.postMessage(null, [transferable]);
    };

    if (buffer.byteLength === 2) {
      $detach(buffer);
      if (buffer.byteLength === 0) detach = $detach;
    }
  }
} catch (error) { /* empty */ }

module.exports = detach;