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 5718x 18x 18x 18x 18x 18x 18x 18x 18x 18x 18x 18x 18x 18x 18x 18x 18x 18x 18x 18x 18x 585x 585x 585x 585x 585x 41x 41x 41x 41x 6x 6x 6x 6x 6x 32x 32x 585x 585x 18x 4002x 4002x 4002x 4002x 4002x 4002x 18x 18x 18x 18x 18x 18x 18x 18x 18x 18x  
'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,
};