Utilizing TypeScript's Type Inference to Simplify Function Combinations

I'm facing a challenge with what should be simple. The types aren't coming through as expected when trying to combine a couple of functions. Is there a way to have TypeScript infer the types without explicitly specifying them?

import { pipe, map } from 'ramda'

type TODO = unkown

export const mapP = (xf: TODO) => (data: TODO) =>
  pipe(
    map(xf),
    x => Promise.all(x),
  )(data)

I just want map to determine the types for the function and not have to manually input them again. Thank you in advance!

typescriptfunctional-programmingtypescript-typingsramda.js

Answer №1

import { pipe, map } from 'ramda'

export const mapP = <T,R>(xf: (value:T) => Promise<R>|R) => (data: T[]): Promise<R[]> =>
  pipe(
    map(xf),
    x => Promise.all(x),
  )(data)

Is there any need for clarification on this topic?

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