react-native-confirmation-code-field/src/components/ConfirmationCodeInput/validation.js

A react-native component to input confirmation code for both Android and IOS

// @flow
import type { PropsTypeCustomValidatorFn } from './types';

export const validateCompareCode: PropsTypeCustomValidatorFn = (
  props,
  propName,
  componentName,
) => {
  const compareWithCode = props[propName];

  if (compareWithCode) {
    const { codeLength } = props;

    if (compareWithCode.length !== codeLength) {
      return new Error(
        `Invalid prop ${propName} supplied to ${componentName}. Validation failed. ${propName} length  is not equal to "codeLength" (${
          compareWithCode.length
        } !== ${codeLength}).`,
      );
    }
  }
};