React Native, passing locale parameter from i18next to Axios config file gives Invalid hook call err-CodePudding

I'm trying to implement a locale parameter into my axiosConfig file:

import axios from "axios";

const instance = axios.create({
  baseURL: "http://10.0.2.2:8000/api",
  timeout: 2000,
});

instance.defaults.headers.common["locale"] = "en";

export default instance;

On each screen I make my get and post calls on screens as such:

axiosConfig
      .get("/someroute")
      .then((response) => {
        //console.log(response.data);
      })
      .catch((error) => {
        console.log(error.message);
      });

The above code works as intended. Now I want to pass a "locale" parameter into all of my axios calls. This parameter will come from app locale (i use i18next). When I implement it as below, it throws an invalid hook error.

import axios from "axios";
import { useTranslation } from "react-i18next";

const { i18n } = useTranslation();

const instance = axios.create({
  baseURL: "http://10.0.2.2:8000/api",
  timeout: 2000,
});

instance.defaults.headers.common["locale"] = i18n.language;

export default instance;

What would be the correct way to set the locale header in my configuration?

CodePudding user response：

You are getting this error because a hook should be called in a React Component or inside another hook. See Rules of Hooks. And here is what you could do for example:

Transform the file where you are setting the axios instance to a hook:

import axios from "axios";
import { useTranslation } from "react-i18next";

const useAxiosInstance = ()=>{
  const { i18n } = useTranslation();

  const instance = axios.create({
    baseURL: "http://10.0.2.2:8000/api",
    timeout: 2000,
  });
  instance.defaults.headers.common["locale"] = i18n.language;
  
  return instance;
}
export default useAxiosInstance;

You include the hook at the top of the file where you are using the axios config and use it as an example this way:

import {useEffect} from "react";
import useAxiosConfig from "./path";

const AxiosConsumer = ()=>{
 const axiosConfig = useAxiosConfig();
 
 useEffect(()=>{
   axiosConfig
    .get("/someroute")
    .then((response) => {
    //console.log(response.data);
    })
    .catch((error) => {
    console.log(error.message);
    });
  },[axiosConfig]);
  
  return <></>
}