All files / lib/internal/worker js_transferable.js

100% Statements 56/56
100% Branches 8/8
100% Functions 2/2
100% Lines 56/56

Press n or j to go to the next uncovered block, b, p or k for the previous block.

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 5720x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x 573x 573x 573x 573x 573x 37x 37x 37x 37x 6x 6x 6x 6x 6x 28x 28x 573x 573x 20x 1684x 1684x 1684x 1684x 1684x 1684x 20x 20x 20x 20x 20x 20x 20x 20x 20x 20x  
'use strict';
const {
  Error,
  ObjectDefineProperties,
  ObjectGetOwnPropertyDescriptors,
  ObjectGetPrototypeOf,
  ObjectSetPrototypeOf,
  ReflectConstruct,
  StringPrototypeSplit,
} = primordials;
const {
  messaging_deserialize_symbol,
  messaging_transfer_symbol,
  messaging_clone_symbol,
  messaging_transfer_list_symbol
} = internalBinding('symbols');
const {
  JSTransferable,
  setDeserializerCreateObjectFunction
} = internalBinding('messaging');
 
function setup() {
  // Register the handler that will be used when deserializing JS-based objects
  // from .postMessage() calls. The format of `deserializeInfo` is generally
  // 'module:Constructor', e.g. 'internal/fs/promises:FileHandle'.
  setDeserializerCreateObjectFunction((deserializeInfo) => {
    const { 0: module, 1: ctor } = StringPrototypeSplit(deserializeInfo, ':');
    const Ctor = require(module)[ctor];
    if (typeof Ctor !== 'function' ||
        typeof Ctor.prototype[messaging_deserialize_symbol] !== 'function') {
      // Not one of the official errors because one should not be able to get
      // here without messing with Node.js internals.
      // eslint-disable-next-line no-restricted-syntax
      throw new Error(`Unknown deserialize spec ${deserializeInfo}`);
    }
 
    return new Ctor();
  });
}
 
function makeTransferable(obj) {
  const inst = ReflectConstruct(JSTransferable, [], obj.constructor);
  ObjectDefineProperties(inst, ObjectGetOwnPropertyDescriptors(obj));
  ObjectSetPrototypeOf(inst, ObjectGetPrototypeOf(obj));
  return inst;
}
 
module.exports = {
  makeTransferable,
  setup,
  JSTransferable,
  kClone: messaging_clone_symbol,
  kDeserialize: messaging_deserialize_symbol,
  kTransfer: messaging_transfer_symbol,
  kTransferList: messaging_transfer_list_symbol,
};