How to use the @glimmer/validator.isConst function in @glimmer/validator

APPEND_OPCODES.add(Op.DynamicAttr, (vm, { op1: _name, op2: trusting, op3: _namespace }) => {
  let name = vm[CONSTANTS].getString(_name);
  let reference = check(vm.stack.pop(), CheckReference);
  let value = reference.value();
  let namespace = _namespace ? vm[CONSTANTS].getString(_namespace) : null;

  let attribute = vm.elements().setDynamicAttribute(name, value, !!trusting, namespace);

  if (!isConst(reference)) {
    vm.updateWith(new UpdateDynamicAttributeOpcode(reference, attribute));
  }
});

APPEND_OPCODES.add(Op.PushRemoteElement, vm => {
  let elementRef = check(vm.stack.pop(), CheckReference);
  let insertBeforeRef = check(vm.stack.pop(), CheckReference);
  let guidRef = check(vm.stack.pop(), CheckReference);

  let element: SimpleElement;
  let insertBefore: Maybe;
  let guid = guidRef.value() as string;

  if (isConst(elementRef)) {
    element = check(elementRef.value(), CheckElement);
  } else {
    let cache = new ReferenceCache(elementRef as Reference);
    element = check(cache.peek(), CheckElement);
    vm.updateWith(new Assert(cache));
  }

  if (insertBeforeRef.value() !== undefined) {
    if (isConst(insertBeforeRef)) {
      insertBefore = check(insertBeforeRef.value(), CheckOption(CheckNode));
    } else {
      let cache = new ReferenceCache(insertBeforeRef as Reference>);
      insertBefore = check(cache.peek(), CheckOption(CheckNode));
      vm.updateWith(new Assert(cache));
    }
  }

let guidRef = check(vm.stack.pop(), CheckReference);

  let element: SimpleElement;
  let insertBefore: Maybe;
  let guid = guidRef.value() as string;

  if (isConst(elementRef)) {
    element = check(elementRef.value(), CheckElement);
  } else {
    let cache = new ReferenceCache(elementRef as Reference);
    element = check(cache.peek(), CheckElement);
    vm.updateWith(new Assert(cache));
  }

  if (insertBeforeRef.value() !== undefined) {
    if (isConst(insertBeforeRef)) {
      insertBefore = check(insertBeforeRef.value(), CheckOption(CheckNode));
    } else {
      let cache = new ReferenceCache(insertBeforeRef as Reference>);
      insertBefore = check(cache.peek(), CheckOption(CheckNode));
      vm.updateWith(new Assert(cache));
    }
  }

  let block = vm.elements().pushRemoteElement(element, guid, insertBefore);
  if (block) vm.associateDestroyable(block);
});