How to use the @glimmer/program.HeapImpl function in @glimmer/program

export function JitRuntime(
  options: EnvironmentOptions,
  resolver: RuntimeResolverDelegate = {},
  delegate: EnvironmentDelegate = {}
): JitRuntimeContext {
  let env = new EnvironmentImpl(options, delegate);

  let constants = new Constants();
  let heap = new HeapImpl();
  let program = new RuntimeProgramImpl(constants, heap);

  return {
    env,
    resolver: new DefaultRuntimeResolver(resolver),
    program,
  };
}