React Native with Typescript - void has no call signature

🐛 Bug report

Current Behavior

I cannot chain the handleChange function and call it again because the types say that it may return void, this is also giving me that error when trying to put that function in my input’s onChangeText method

Expected behavior

handleChange is always returning a function so it shouldn’t have void in its return types

Reproducible example

I got this error while using the useFormik hook with React Native and using the handleChange method provided by the useFormik hook

Your environment

Software	Version(s)
Formik	2.0.1-rc.13
React	16.9.0
React Native	0.60.5
TypeScript	3.6.3
Browser	Chrome
npm/Yarn	Yarn 1.17.3
Operating System	Mac OS

[pybuche]

Up ! Is there any news on this ?

[mbaroukh]

the workaround suggested by @PawelJ-PL works and you can use it to make your own useFormik hook like this:

import { useFormik, FormikConfig } from "formik"

export default <V>(config: FormikConfig<V>) => {
  const value = useFormik(config)

  type UsableType = {
    handleChange: (name: string) => (text: string) => void
    handleBlur: (name: string) => (event: any) => void
  } & typeof value

  return value as UsableType
}