typescript - 类型 'Observable<{}>' 不可分配给类型 'Observable | boolean '

Question

我正在努力关注 this tutorial ，但我收到错误。

1. 路径匹配:“完整”。我尝试将“@angular/router”更改为“3.0.0-beta.2”，仍然是同样的问题。

我的依赖项:

"dependencies": {
    "@angular/common": "2.0.0-rc.3",
    "@angular/compiler": "2.0.0-rc.3",
    "@angular/core": "2.0.0-rc.3",
    "@angular/http": "2.0.0-rc.3",
    "@angular/platform-browser": "2.0.0-rc.3",
    "@angular/platform-browser-dynamic": "2.0.0-rc.3",
    "@angular/platform-server": "2.0.0-rc.3",
    "@angular/router": "3.0.0-beta.2",
    "@angular/router-deprecated": "2.0.0-rc.2",
    "nativescript-angular": "0.2.0",
    "tns-core-modules": "^2.1.0"
},

1. 类型“Observable<{}>”不可分配给类型“Observable”，它指向行'return o'；

   canDeactivate(): Observable<boolean> | boolean {
   
   if (!this.crisis || this.crisis.name === this.editName) {
   
   return true;
   }
   let p = this.dialogService.confirm('Discard changes?');
   let o = Observable.fromPromise(p);
   return o;
   }
   

谁能指导我修复这些错误？谢谢。

Answer 1

您可以尝试转换:

canDeactivate(): Observable<boolean> | boolean {

    if (!this.crisis || this.crisis.name === this.editName) {

        return true;
    }
    let p = this.dialogService.confirm('Discard changes?');
    let o = <Observable<boolean>>Observable.fromPromise(p);
    return o;
}