javascript - Typescript 编译器为 Reselect.createSelector() 生成错误的返回类型

Question

据我所知，用于重新选择的 .d.ts 文件 ( https://github.com/reactjs/reselect ) 是正确的。那么这是怎么回事……是 Typescript 编译器的问题吗？我的 tsconfig？

要重现该问题:

演示.ts

import { createSelector, Selector } from 'reselect';

export interface DemoState {
    values: {
        value1: number,
        value2: number
    },
}

export const selectTotal = createSelector<DemoState, number, number, number>(
    state => state.values.value1,
    state => state.values.value2,
    (value1, value2) => {
        return value1 + value2;
    }
);

从 reselect.d.ts 看来 createSelector()上面应该返回类型 Selector<DemoState, number> :

重新选择.d.ts

function createSelector<TInput, TOutput, T1, T2>(selector1: Selector<TInput, T1>, selector2: Selector<TInput, T2>, combiner: (arg1: T1, arg2: T2) => TOutput): Selector<TInput, TOutput>;

type Selector<TInput, TOutput> = (state: TInput, props?: any) => TOutput;

但是， typescript 编译器实际生成的定义是:

演示.d.ts

export declare const selectTotal: Selector<DemoState, number, number, number>;

Soo...当我导入selectTotal时在另一个项目中，我收到错误:“通用类型‘选择器’需要 2 个类型参数。”因为reselect.d.ts只定义了Selector<TInput, TOutput>据我所知，这就是 createSelector无论传递给它的类型参数的数量如何，都应该返回。

生成正确定义的唯一方法是显式转换 createSelector结果，但我认为我不应该这样做..

export const selectTotal = createSelector<DemoState, number, number, number>(
state => state.values.value1,
state => state.values.value2,
(value1, value2) => {
    return value1 + value2;
}) as Selector<DemoState, number>;

使用 TypeScript 2.0.3 和我的 tsconfig(以防相关):

{
  "compileOnSave": true,
  "compilerOptions": {
    "rootDir": "./src",
    "outDir": "./dist",
    "declaration": true,
    "sourceMap": true,
    "target": "es6",
    "module": "es6",
    "moduleResolution": "node",
    "jsx": "preserve",
    "allowSyntheticDefaultImports": true,
    "noImplicitAny": true,
    "suppressImplicitAnyIndexErrors": true,
    "removeComments": false,
    "preserveConstEnums": true
  },
  "exclude": [
    "node_modules",
    "dist"
  ]
}

Answer 1

事实证明这是 TypeScript 2.0.3 编译器的问题。升级到 2.0.6+ 可以解决该问题。

https://github.com/Microsoft/TypeScript/issues/12370