12 replies

Functions type for key of objects with specific key

Hey, are there any typescript wizards here that could help? I've been trying for a while already but don't really get there. I would like to type a function that takes in two arguments: an arbitrary object as the first argument and for the second argument a key of that object but only allow keys with e.g. a number as an associated value. What's the best way to do this?

This is what I have so far. I only want to allow valueKeys which have a type number as a value. Thanks!

const BarChart = <
  T extends { date: Date },
  K1 extends keyof T,
>({
  data,
  valueKey,
}: {
  data: T[]
  valueKey: K1
}) => {...}

const BarChart = <
  T extends { date: Date },
  K1 extends keyof T,
>({
  data,
  valueKey,
}: {
  data: T[]
  valueKey: K1
}) => {...}

TTC

Theo's Typesafe Cult•4y ago•

12 replies

kliyer

Functions type for key of objects with specific key

const BarChart = <
  T extends { date: Date },
  K1 extends keyof T,
>({
  data,
  valueKey,
}: {
  data: T[]
  valueKey: K1
}) => {...}

const BarChart = <
  T extends { date: Date },
  K1 extends keyof T,
>({
  data,
  valueKey,
}: {
  data: T[]
  valueKey: K1
}) => {...}

Functions type for key of objects with specific key

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