Function innerDeepFreeze

lib/internal/freeze_intrinsics.js:423–491

* "innerDeepFreeze()" acts like "Object.freeze()", except that: * * To deepFreeze an object is to freeze it and all objects transitively * reachable from it via transitive reflective property and prototype * traversal.

(node)

     * traversal.
     */
    function innerDeepFreeze(node) {
      // Objects that we have frozen in this round.
      const freezingSet = new SafeSet();

      // If val is something we should be freezing but aren't yet,
      // add it to freezingSet.
      function enqueue(val) {
        if (Object(val) !== val) {
          // ignore primitives
          return;
        }
        const type = typeof val;
        if (type !== 'object' && type !== 'function') {
          // NB: handle for any new cases in future
        }
        if (frozenSet.has(val) || freezingSet.has(val)) {
          // TODO: Use uncurried form
          // Ignore if already frozen or freezing
          return;
        }
        freezingSet.add(val); // TODO: Use uncurried form
      }

      function doFreeze(obj) {
        // Immediately freeze the object to ensure reactive
        // objects such as proxies won't add properties
        // during traversal, before they get frozen.

        // Object are verified before being enqueued,
        // therefore this is a valid candidate.
        // Throws if this fails (strict mode).
        ObjectFreeze(obj);

        // We rely upon certain commitments of Object.freeze and proxies here

        // Get stable/immutable outbound links before a Proxy has a chance to do
        // something sneaky.
        const proto = ObjectGetPrototypeOf(obj);
        const descs = ObjectGetOwnPropertyDescriptors(obj);
        enqueue(proto);
        ArrayPrototypeForEach(ReflectOwnKeys(descs), (name) => {
          const desc = descs[name];
          if (ObjectPrototypeHasOwnProperty(desc, 'value')) {
            // todo uncurried form
            enqueue(desc.value);
          } else {
            enqueue(desc.get);
            enqueue(desc.set);
          }
        });
      }

      function dequeue() {
        // New values added before forEach() has finished will be visited.
        freezingSet.forEach(doFreeze); // TODO: Curried forEach
      }

      function commit() {