Function getConstructorName

lib/internal/util/inspect.js:908–965

(obj, ctx, recurseTimes, protoProps)

  .set(WeakSetPrototype, { name: 'WeakSet', constructor: WeakSet });

function getConstructorName(obj, ctx, recurseTimes, protoProps) {
  let firstProto;
  const tmp = obj;
  while (obj || isUndetectableObject(obj)) {
    const wellKnownPrototypeNameAndConstructor = wellKnownPrototypes.get(obj);
    if (wellKnownPrototypeNameAndConstructor !== undefined) {
      const { name, constructor } = wellKnownPrototypeNameAndConstructor;
      if (FunctionPrototypeSymbolHasInstance(constructor, tmp)) {
        if (protoProps !== undefined && firstProto !== obj) {
          addPrototypeProperties(
            ctx, tmp, firstProto || tmp, recurseTimes, protoProps);
        }
        return name;
      }
    }
    const descriptor = ObjectGetOwnPropertyDescriptor(obj, 'constructor');
    if (descriptor !== undefined &&
        typeof descriptor.value === 'function' &&
        descriptor.value.name !== '' &&
        isInstanceof(tmp, descriptor.value)) {
      if (protoProps !== undefined &&
         (firstProto !== obj ||
         !builtInObjects.has(descriptor.value.name))) {
        addPrototypeProperties(
          ctx, tmp, firstProto || tmp, recurseTimes, protoProps);
      }
      return String(descriptor.value.name);
    }

    obj = ObjectGetPrototypeOf(obj);
    if (firstProto === undefined) {
      firstProto = obj;
    }
  }

  if (firstProto === null) {
    return null;
  }

  const res = internalGetConstructorName(tmp);

  if (recurseTimes > ctx.depth && ctx.depth !== null) {
    return `${res} <Complex prototype>`;
  }

  const protoConstr = getConstructorName(
    firstProto, ctx, recurseTimes + 1, protoProps);

  if (protoConstr === null) {
    return `${res} <${inspect(firstProto, {
      ...ctx,
      customInspect: false,
      depth: -1,
    })}>`;
  }

  return `${res} <${protoConstr}>`;
}