fp-ts filterWithIndex "index signatures are incompatible"

Question

通过 fp-ts 学习打字稿让我遇到麻烦。

我收到以下错误：

Type 'Record<string, number>' is not assignable to type 'Timestamps'. Index signatures are incompatible. Type 'number' is not assignable to type 'Timestamp'.(2322)

代码如下：

import * as R from "fp-ts/dist/esm/Record";

interface Timestamp {
  date: number
  id: string
}

interface Timestamps {
  [key: string]: Timestamp
}

const MyFunction = (dates: Timestamps): Timestamps => {
    const predicate = (s: string, v: number) => s === "date" && v > 0 // 0 milliseconds
    return R.filterWithIndex(predicate)(dates)
}

我应该更改什么才能使我的代码正常工作？

Answer 1

您的谓词需要对 Timestamps 进行操作，而不是 numbers

const predicate = (s: string, v: Timestamp) =>
  s === "date" && v.date > 0

fp-ts filterWithIndex "index signatures are incompatible"

fp-ts filterWithIndex "index signatures are incompatible"

typescript

functional-programming

fp-ts