template-ivan/react/src/actions/httpmiddleware.js

scaffold template

// @flow

// 对于Symbol类型的primitive types value，flow无法检测，定义变量时直接标注为any越过检测
const HTTP_API: any = Symbol('request JSON')

type Params<A, B, C, D> = {
  +options?: Object,
  +url: string,
  +types: [A, B, C, D],
}

type HttpRequest<A, B, C, D> = {
  type: (A | B | C | D),
  +HTTP_API: Params<A, B, C, D>,
}

export type HttpApi = {|
  [HTTP_API]: Params<string, string, string, string>,
|}

export type HttpMiddleware =
  | HttpApi
  | HttpRequest<string, string, string, string>

export default HTTP_API