HarmonyOS 鸿蒙Next promptAction.openCustomDialog builder使用自定义组件，toast封装

@Builder
function toastBuilder(content?: string, iconDirection?: Direction, duration?: number) {
ToastBuilder({
content: content,
iconDirection: iconDirection,
duration: duration
})
}

export class Toast {
static dialogId?: number = undefined;
showToast(content?: string, iconDirection?: JDDirection, duration?: number) {
if (Toast.toastShowed) {
return;
}
promptAction.openCustomDialog({
  builder: toastBuilder(content, iconDirection, duration)
}).then((dialogId: number) => {
  Toast.dialogId = dialogId
})
}
closeToast(): void {
promptAction.closeCustomDialog(JDToast.dialogId);
}
}<button style="position: absolute; padding: 4px 8px 0px; cursor: pointer; top: 8px; right: 8px; font-size: 14px;">复制</button>

以上代码，运行时报错

Error message:Cannot read property observeComponentCreation2 of undefined

SourceCode:

        (parent ? parent : this).observeComponentCreation2((elmtId, isInitialRender) => {

}

ToastBuilder为自定义的Compnent，其实核心是想封装一个toast的工具类，不想每次使用都自定义一个controller，求指教