Angular 7 找不到管道 [英] Angular 7 doesn't find pipes

问题描述

我正在尝试构建我的 Angular 7 项目，但每次我收到错误提示

I'm trying to build my Angular 7 project but every time I get an error saying

模板解析错误:找不到管道货币".

Template parse errors: The pipe 'currency' could not be found.

但是当我尝试运行 ng serve 它确实按预期工作

But when I try to run the ng serve it does works as expected

我尝试使用 --prod 标志构建它，但它不起作用.如果我删除生产标志，它会正确构建.

I've tried to build it with the --prod flag, and it doesn't work. If I remove the production flag, it builds correctly.

推荐答案

为了使用管道，您首先需要在模块声明中添加管道:

In order to use pipes, you first need add pipe to your module declarations:

import {CurrencyPipeComponent}  from './currencypipe.component';

@NgModule({
  imports:      ...,
  declarations: [
                 ...,
                 CurrencyPipeComponent],
})
export class YourModuleWhichYourComponentIsRegistered { } 

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