Encountering overload error with Vue 3 and Axios integration

Currently utilizing Vue 3, Vite, Axios, and TypeScript. While my function functions properly in development, it throws an error in my IDE and during the build process.

get count() {
      axios({
        method: "get",
        url: "/info/count",
        headers: authHeader(),
      })
        .then((response) => {
        this.count = response.data.status;
      });
    },

Error showing up in PyCharm IDE

TS2769: No overload matches this call. Overload 1 of 2, '(config: AxiosRequestConfig<any>): AxiosPromise<any>', displayed the following error.   Argument of type '{ method: "get"; url: string; headers: { Authorization: string; } | { Authorization?: undefined; }; }' is not assignable to parameter of type 'AxiosRequestConfig<any>'.     Object literal may only specify known properties, and 'headers' does not exist in type 'AxiosRequestConfig<any>'. Overload 2 of 2, '(url: string, config?: AxiosRequestConfig<any>): AxiosPromise<any>', showed the following error.   Argument of type '{ method: string; url: string; headers: { Authorization: string; } | { Authorization?: undefined; }; }' is not assignable to parameter of type 'string

Content within AuthHeader()

export default function authHeader () {
   
        let user_token = localStorage.getItem('auth_user')
        let auth_token = localStorage.getItem('auth_token')

        if (user_token && auth_token) {
            return { 'Authorization': 'bearer ' + auth_token };
        } else {
            return {};
        }
}

Answer №1

The function authHeader() returns either

{ Authorization: string; } | { Authorization?: undefined; }
based on its logic:

export default function authHeader () {
  ⋮
  if (user_token && auth_token) {
    return { 'Authorization': 'bearer ' + auth_token }; // 💡 type is { Authorization: string; }
  } else {
    return {}; // 💡 type is { Authorization?: undefined; }
  }
}

However, Axios's headers option requires a structure of Record<string, string>. To address this, you can specify the return type of the function as follows:

                                           👇
export default function authHeader (): Record<string, string> {
  ⋮
}

Check out the demo here

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