typescript - 类型 'awaited T' 的参数不可分配给类型 'T' 的参数

Question

我收到此错误消息，不知道该怎么办(如下面的EDIT 所述，我使用的是 TS version 3.9.0-dev.20200324) ...

error(TS2345): Argument of type 'awaited T' is not assignable to parameter of type 'T'. 'T' could be instantiated with an arbitrary type which could be unrelated to 'awaited T'.

TypeScript 代码:lib/functional/promise-or-not.ts

// ... [more code]

export async function thenified<T>(
  promise: Promise<T>,
  funct: <R>(t: T) => R,
): Promise<any> {
  return promise.then(
    t => funct(t)
  );
}

输出:tsc Version 3.9.0-dev.20200324

% ❯  tsc # 3.9.0-dev.20200324 
lib/functional/promise-or-not.ts:10:16 - error TS2345: Argument of type 'awaited T' is not assignable to parameter of type 'T'.
  'T' could be instantiated with an arbitrary type which could be unrelated to 'awaited T'.

10     t => funct(t)
                  ~
Found 1 error.

另见 this comment在 Microsoft/TypeScript/#37664 中:

Wrong return type inference in a generic function using Promise.all

编辑

由于在使用其他 TS 版本时我的代码中存在不同的其他问题，我无法使用 Version 3.9.0-dev.20200324。

这是在使用Version 4.0.0-dev.20200504时其他部分的代码这里就不展示了，问题详见this GitHub issue .

Playground 3.9.0-dev.20200324

Playground Nightly

Playground 3.8.3

Answer 1

将 t 转换为 any

export async function thenified<T>(
  promise: Promise<T>,
  funct: <R>(t: T) => R,
): Promise<any> {
  return promise.then(
    t => funct(t as any)
  );
}

糟糕的解决方法，但你能做什么。