Custom Axios Instance

import { defineConfig } from 'orval';

export default defineConfig({
  petstore: {
    output: {
      // ...
	  httpClient: 'axios',
      override: {
        mutator: {
          path: './api/mutator/custom-instance.ts',
          name: 'customInstance',
        },
      },
    },
  },
});

import Axios, { AxiosRequestConfig, AxiosError } from 'axios';

export const AXIOS_INSTANCE = Axios.create({
  baseURL: '<BACKEND URL>', // use your own URL or environment variable
});

// Add a second `options` argument to pass extra options to each query
export const customInstance = <T>(
  config: AxiosRequestConfig,
  options?: AxiosRequestConfig,
): Promise<T> => {
  const promise = AXIOS_INSTANCE({
    ...config,
    ...options,
  }).then(({ data }) => data);

  return promise;
};

// Override the return error type for react-query and swr
export type ErrorType<Error> = AxiosError<Error>;

// Standard body type
export type BodyType<BodyData> = BodyData;

// Or wrap the body type if processing data before sending
// export type BodyType<BodyData> = CamelCase<BodyData>;

import Axios, { AxiosRequestConfig, AxiosError } from 'axios';

export const AXIOS_INSTANCE = Axios.create({
  baseURL: process.env.API_URL,
});

// Request interceptor for auth
AXIOS_INSTANCE.interceptors.request.use(
  (config) => {
    const token = localStorage.getItem('token');
    if (token) {
      config.headers.Authorization = `Bearer ${token}`;
    }
    return config;
  },
  (error) => Promise.reject(error),
);

// Response interceptor for error handling
AXIOS_INSTANCE.interceptors.response.use(
  (response) => response,
  (error) => {
    if (error.response?.status === 401) {
      // Handle unauthorized
      window.location.href = '/login';
    }
    return Promise.reject(error);
  },
);

export const customInstance = <T>(
  config: AxiosRequestConfig,
  options?: AxiosRequestConfig,
): Promise<T> => {
  return AXIOS_INSTANCE({
    ...config,
    ...options,
  }).then(({ data }) => data);
};

export type ErrorType<Error> = AxiosError<Error>;
export type BodyType<BodyData> = BodyData;