redux-form/redux-form

// @flow
import type { ElementType, ElementRef, ComponentType } from 'react'

export type Props = {
  name: string,
  component: ComponentType<any> | ElementType,
  props?: Object,
  rerenderOnEveryChange?: boolean,
  validate?: (value: any, allValues: Object, props: Object) => ?any,
  warn?: (value: any, allValues: Object, props: Object) => ?any,
  forwardRef?: boolean
}

export type Fields = {
  _isFieldArray: boolean,
  forEach(callback: Function): void,
  get(index: number): any,
  getAll(): Array<any>,
  insert(index: number, value: any): void,
  length: number,
  map(callback: Function): Array<any>,
  move(from: number, to: number): void,
  name: string,
  pop(): any,
  push(value: any): void,
  reduce(callback: Function): any,
  remove(index: number): void,
  removeAll(): void,
  shift(): any,
  some(callback: Function): boolean,
  swap(from: number, to: number): void,
  unshift(value: any): void
}

export type FieldArrayProps = {
  fields: Fields,
  meta: {
    dirty: boolean,
    error?: any,
    form: string,
    invalid: boolean,
    pristine: boolean,
    submitting: boolean,
    submitFailed: boolean,
    touched: boolean,
    valid: boolean,
    warning?: any
  },
  ref?: ElementRef<any>
}