在Angular 2项目中运行ng serve -aot命令出错

Error running ng serve -aot command in Angular 2 project

本文关键字：serve -aot 命令 出错 ng 运行 Angular 项目      更新时间：2023-09-26

当我用以下命令运行我的Angular 2项目时，出现了一个错误:

ng serve -aot

堆栈跟踪:

ERROR in ./src/app/app.module.ngfactory.ts
Module build failed: Error: /Users/iguissouma/IdeaProjects/myproject/frontend/src/app/shared/services/message.service.ts (9,5): Public property 'messageSource$' of exported class has or is using name 'Observable' from external module "/Users/iguissouma/IdeaProjects/myproject/frontend/node_modules/rxjs/Observable" but cannot be named.)
    at _transpile (/Users/iguissouma/IdeaProjects/myproject/frontend/node_modules/@ngtools/webpack/src/loader.js:101:19)
    at /Users/iguissouma/IdeaProjects/myproject/frontend/node_modules/@ngtools/webpack/src/loader.js:128:26
    at tryCatch (/Users/iguissouma/IdeaProjects/myproject/frontend/node_modules/es6-promise/dist/lib/es6-promise/-internal.js:195:12)
    at invokeCallback (/Users/iguissouma/IdeaProjects/myproject/frontend/node_modules/es6-promise/dist/lib/es6-promise/-internal.js:210:13)
    at publish (/Users/iguissouma/IdeaProjects/myproject/frontend/node_modules/es6-promise/dist/lib/es6-promise/-internal.js:178:7)
    at flush (/Users/iguissouma/IdeaProjects/myproject/frontend/node_modules/es6-promise/dist/lib/es6-promise/asap.js:94:5)
    at nextTickCallbackWith0Args (node.js:420:9)
    at process._tickCallback (node.js:349:13)
 @ ./src/main.ts 4:0-64
 @ multi main

应用程序运行良好的ng serve

如何解决这个问题?

message.service.ts 

import { Injectable } from '@angular/core'
import { Subject } from 'rxjs/Subject';
import { Message } from 'primeng/primeng';
@Injectable()
export class MessageService {
    messageSource = new Subject<Message>();
    messageSource$ = this.messageSource.asObservable();
    info(summary : string, detail : string) {
        this.messageSource.next({severity:'info', summary: summary, detail: detail});
        console.log("INFO: " + summary + " DETAIL: " + detail);
    }
    error(summary : string, detail : string) {
        this.messageSource.next({severity:'error', summary: summary, detail: detail});
        console.log("ERROR: " + summary + " DETAIL: " + detail);
    }
}

我像下面这样修改了message.service.ts来声明字段的显式类型:

import { Injectable } from '@angular/core'
import { Subject } from 'rxjs/Subject';
import { Message } from 'primeng/primeng';
import { Observable } from 'rxjs/Rx';
@Injectable()
export class MessageService {
    messageSource:Subject<Message> = new Subject<Message>();
    messageSource$:Observable<Message> = this.messageSource.asObservable();
    info(summary : string, detail : string) {
        this.messageSource.next({severity:'info', summary: summary, detail: detail});
        console.log("INFO: " + summary + " DETAIL: " + detail);
    }
    error(summary : string, detail : string) {
        this.messageSource.next({severity:'error', summary: summary, detail: detail});
        console.log("ERROR: " + summary + " DETAIL: " + detail);
    }
}
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