> For the complete documentation index, see [llms.txt](https://chanshiyu.gitbook.io/blog/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://chanshiyu.gitbook.io/blog/qian-duan/shi-zhan-xi-lie/08axios-zi-ding-yi-fan-hui-zhi-lei-xing.md).

# 08 Axios 自定义返回值类型

参考文章：[axios 返回值类型能不能改](https://segmentfault.com/q/1010000041697612)

修改 axios 的类型声明，添加 `axios.d.ts`。

```ts
import { AxiosRequestConfig } from "axios"

declare module "axios" {
  export interface AxiosInstance {
    <T = any>(config: AxiosRequestConfig): Promise<T>
    request<T = any>(config: AxiosRequestConfig): Promise<T>
    get<T = any>(url: string, config?: AxiosRequestConfig): Promise<T>
    delete<T = any>(url: string, config?: AxiosRequestConfig): Promise<T>
    head<T = any>(url: string, config?: AxiosRequestConfig): Promise<T>
    post<T = any>(
      url: string,
      data?: any,
      config?: AxiosRequestConfig
    ): Promise<T>
    put<T = any>(
      url: string,
      data?: any,
      config?: AxiosRequestConfig
    ): Promise<T>
    patch<T = any>(
      url: string,
      data?: any,
      config?: AxiosRequestConfig
    ): Promise<T>
  }
}

interface Result<T = string> {
  code: number
  data: T
}

axios.get<Result>("/url") // 返回 Primise<Result<string>>
```