sweetalert2/src/staticMethods/adaptInputValidator.js

A beautiful, responsive, customizable and accessible (WAI-ARIA) replacement for JavaScript's popup boxes, supported fork of sweetalert

/**
 * Adapt a legacy inputValidator for use with expectRejections=false
 */
export const adaptInputValidator = (legacyValidator) => {
  return function adaptedInputValidator (inputValue, extraParams) {
    return legacyValidator.call(this, inputValue, extraParams)
      .then(() => undefined, validationError => validationError)
  }
}