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* Copyright 2021 Harness Inc. All rights reserved.
* Use of this source code is governed by the PolyForm Shield 1.0.0 license
* that can be found in the licenses directory at the root of this repository, also available at
* https://polyformproject.org/wp-content/uploads/2020/06/PolyForm-Shield-1.0.0.txt.
*/
import { useEffect, useRef } from 'react'
import type { FormikContext } from 'formik'
//
// Global onChange utility for Formik
// @see https://github.com/formium/formik/issues/1633#issuecomment-520121543
//
// eslint-disable-next-line @typescript-eslint/no-explicit-any
function usePrevious(value: any): any {
// The ref object is a generic container whose current property is mutable ...
// ... and can hold any value, similar to an instance property on a class
const ref = useRef()
// Store current value in ref
useEffect(() => {
ref.current = value
}, [value]) // Only re-run if value changes
// Return previous value (happens before update in useEffect above)
return ref.current
}
export interface FormikEffectOnChangeParams {
// eslint-disable-next-line @typescript-eslint/no-explicit-any
prevValues: Record<string, any>
// eslint-disable-next-line @typescript-eslint/no-explicit-any
nextValues: Record<string, any>
// eslint-disable-next-line @typescript-eslint/no-explicit-any
formik: FormikContext<any>
}
export interface FormikEffectProps {
onChange: ({ prevValues: prevValue, nextValues: nextValue, formik }: FormikEffectOnChangeParams) => void
// eslint-disable-next-line @typescript-eslint/no-explicit-any
formik: FormikContext<any>
}
export const FormikEffect: React.FC<FormikEffectProps> = ({ onChange, formik }) => {
const { values } = formik
const prevValues = usePrevious(values)
useEffect(() => {
// Don't run effect on form init
if (prevValues) {
onChange({ prevValues, nextValues: values, formik })
}
}, [prevValues, values, formik, onChange])
return null
}
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