无法解析自定义指令的所有参数 [英] Can't resolve all parameters for custom directive

问题描述

我创建了一个自定义指令来在新选项卡中打开一个链接，在 ng serve 中运行时，它可以工作.但是，当我在 ng build --prod 中尝试时，它显示了这个错误:

I created a custom directive to open a link in a new tab, when running in ng serve, it works. However, when I tried in ng build --prod, it showed this error:

无法解析 C:/Users/myApp/src/app/directives/open-link-in-new-tab.directive.ts: ([object Object], ?) 中 OpenLinkInNewTabDirective 的所有参数中的错误.

ERROR in Can't resolve all parameters for OpenLinkInNewTabDirective in C:/Users/myApp/src/app/directives/open-link-in-new-tab.directive.ts: ([object Object], ?).

这是指令:

import { Directive, ElementRef, HostListener, Input, Inject } from '@angular/core';

@Directive({ selector: '[newTab]' })
export class OpenLinkInNewTabDirective {
    constructor(
      private el: ElementRef,
      @Inject(Window) private win:Window
    ) {}

    @Input('routerLink') link: string;
    @HostListener('mousedown') onMouseEnter() {
        this.win.open(this.link || 'main/default');
    }
}

我已经在 tsconfig.json 中设置了 "emitDecoratorMetadata": true.先感谢您.

I set "emitDecoratorMetadata": true in tsconfig.json already. Thank you in advance.

推荐答案

这是一个已知问题，因为 Window 是一个打字稿接口.你需要通过创建一个假类来欺骗编译器，比如 WindowWrapper.ts

It is known issue because Window is an typescript interface. You need to trick a compiler by creating a fake class say WindowWrapper.ts

@Injectable()
export class WindowWrapper extends Window { }
export function getWindow() { return window; }

app.module:

app.module:

import { WindowWrapper, getWindow } from './WindowWrapper';

providers: [
     {provide: WindowWrapper, useFactory: getWindow}
  ],

指令:

import { Directive, ElementRef, HostListener, Input, Inject } from '@angular/core';
import { WindowWrapper } from './WindowWrapper';

@Directive({ 
    selector: '[newTab]'
})
export class OpenLinkInNewTabDirective {
    constructor(
      private el: ElementRef,
      @Inject(WindowWrapper) private win: Window) {}

    @Input('routerLink') link: string;
    @HostListener('mousedown') onMouseEnter() {
        this.win.open(this.link || 'main/default');
    }
}

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