我如何解决这个“主题错误地扩展了 Observable"?TypeScript 2.4 和 RxJS 5.x 中的错误? [英] How do I get around this "Subject incorrectly extends Observable" error in TypeScript 2.4 and RxJS 5.x?

问题描述

当我编译时，我在 RxJS 声明文件中收到以下编译器错误:

When I compile, I get the following compiler error in the RxJS declaration files:

node_modules/rxjs/Subject.d.ts(16,22): error TS2415: Class 'Subject<T>' incorrectly extends base class 'Observable<T>'.
  Types of property 'lift' are incompatible.
    Type '<R>(operator: Operator<T, R>) => Observable<T>' is not assignable to type '<R>(operator: Operator<T, R>) => Observable<R>'.
      Type 'Observable<T>' is not assignable to type 'Observable<R>'.
         Type 'T' is not assignable to type 'R'.

这里发生了什么，我如何在不降级到 TypeScript 2.3 或更早版本的情况下解决这个问题?

What's going on here, and how do I get around this without downgrading to TypeScript 2.3 or earlier?

推荐答案

解决方案

RxJS 5.4.2 现在应该可以与 TypeScript 2.4.1 完美配合.如果可能，只需升级到 5.4.2+.

npm install --save rxjs@^5.4.2

如果没有立即看到更改，请尝试重新启动编辑器和/或重新编译.

Then try restarting your editor and/or recompile if you don't see an immediate change.

如果没有，下面的解决方案应该可以工作.

If not, the below solution should work.

TypeScript 2.4 有严格的变化，Subject 没有提升到正确的 Observable.签名真的应该是

TypeScript 2.4 has a strictness change, and Subject<T> isn't lifting to the correct Observable. The signature really should have been

<R>(operator: Operator<T, R>) => Observable<R>

这将在 RxJS 6 中修复.

This will be fixed in RxJS 6.

较新版本的 RxJS 将修复此问题，但作为临时解决方法，您可以使用 noStrictGenericChecks 编译器选项.

Newer versions of RxJS will have this fixed, but as a temporary workaround, you can use the noStrictGenericChecks compiler option.

在tsconfig.json中，将其放入"compilerOptions"并设置为true.

In tsconfig.json, put it in "compilerOptions" and set it to true.

{
    "compilerOptions": {
        "noStrictGenericChecks": true
    }
}

在命令行上是 --noStrictGenericChecks.

这篇关于我如何解决这个“主题错误地扩展了 Observable"?TypeScript 2.4 和 RxJS 5.x 中的错误?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！