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

modules.register(key, 'component', { default: { definition: component.definition, manager: component.manager } });
      }
    });

    compiler.compile();

    let handle = compiler.getSpecifierMap().vmHandleBySpecifier.get(spec)! as Recast;
    let { env } = this;

    let cursor = { element, nextSibling: null };
    let builder = elementBuilder({ mode: 'client', env, cursor });
    let self = new UpdatableReference(context);
    let dynamicScope = new TestDynamicScope();
    let resolver = new RuntimeResolver(compiler.getSpecifierMap(), this.modules, this.speficiersToSymbolTable);
    let pool = program.constants.toPool();
    let runtimeProgram = new RuntimeProgram(new RuntimeConstants(resolver, pool), program.heap);

    let vm = LowLevelVM.initial(runtimeProgram, env, self, null, dynamicScope, builder, handle);
    let iterator = new TemplateIterator(vm);

    return renderSync(env, iterator);
  }
}