fix: export AxiosError class at top-level

Currently, there is no way to use AxiosError correctly. This was caused only by exporting the type at the top-level but the implementation deep inside the axios instance.
Exported the AxiosError class at the top-level to fix inconsistencies.

Refs: axios#5062

BREAKING CHANGE: AxiosError should be used from the top-level import rather than using it from the axios instance.

index.d.ts

@@ -398,7 +398,7 @@ export interface AxiosResponse<T = any, D = any> {
   request?: any;
 }
 
-export class AxiosErrorType<T = unknown, D = any> extends Error {
+export class AxiosError<T = unknown, D = any> extends Error {
   constructor(
     message?: string,
     code?: string,
@@ -429,7 +429,7 @@ export class AxiosErrorType<T = unknown, D = any> extends Error {
   static readonly ETIMEDOUT = "ETIMEDOUT";
 }
 
-export class CanceledError<T> extends AxiosErrorType<T> {}
+export class CanceledError<T> extends AxiosError<T> {}
 
 export type AxiosPromise<T = any> = Promise<AxiosResponse<T>>;
 
@@ -566,12 +566,12 @@ export interface AxiosStatic extends AxiosInstance {
   Cancel: CancelStatic;
   CancelToken: CancelTokenStatic;
   Axios: typeof Axios;
-  AxiosError: typeof AxiosErrorType;
+  AxiosError: typeof AxiosError;
   readonly VERSION: string;
   isCancel(value: any): value is Cancel;
   all<T>(values: Array<T | Promise<T>>): Promise<T[]>;
   spread<T, R>(callback: (...args: T[]) => R): (array: T[]) => R;
-  isAxiosError<T = any, D = any>(payload: any): payload is AxiosErrorType<T, D>;
+  isAxiosError<T = any, D = any>(payload: any): payload is AxiosError<T, D>;
   toFormData(
     sourceObj: object,
     targetFormData?: GenericFormData,

index.js

@@ -1,2 +1,4 @@
-import axios from './lib/axios.js';
-export default axios;
+import axios from "./lib/axios.js";
+import AxiosError from "./lib/core/AxiosError.js";
+export { AxiosError };
+export default axios;

lib/axios.js

@@ -1,19 +1,18 @@
-'use strict';
-
-import utils from './utils.js';
-import bind from './helpers/bind.js';
-import Axios from './core/Axios.js';
-import mergeConfig from './core/mergeConfig.js';
-import defaults from './defaults/index.js';
-import formDataToJSON from './helpers/formDataToJSON.js';
-import CanceledError from './cancel/CanceledError.js';
-import CancelToken from './cancel/CancelToken.js';
-import isCancel from './cancel/isCancel.js';
-import {VERSION} from './env/data.js';
-import toFormData from './helpers/toFormData.js';
-import AxiosError from './core/AxiosError.js';
-import spread from './helpers/spread.js';
-import isAxiosError from './helpers/isAxiosError.js';
+"use strict";
+
+import utils from "./utils.js";
+import bind from "./helpers/bind.js";
+import Axios from "./core/Axios.js";
+import mergeConfig from "./core/mergeConfig.js";
+import defaults from "./defaults/index.js";
+import formDataToJSON from "./helpers/formDataToJSON.js";
+import CanceledError from "./cancel/CanceledError.js";
+import CancelToken from "./cancel/CancelToken.js";
+import isCancel from "./cancel/isCancel.js";
+import { VERSION } from "./env/data.js";
+import toFormData from "./helpers/toFormData.js";
+import spread from "./helpers/spread.js";
+import isAxiosError from "./helpers/isAxiosError.js";
 
 /**
  * Create an instance of Axios
@@ -27,10 +26,10 @@ function createInstance(defaultConfig) {
   const instance = bind(Axios.prototype.request, context);
 
   // Copy axios.prototype to instance
-  utils.extend(instance, Axios.prototype, context, {allOwnKeys: true});
+  utils.extend(instance, Axios.prototype, context, { allOwnKeys: true });
 
   // Copy context to instance
-  utils.extend(instance, context, null, {allOwnKeys: true});
+  utils.extend(instance, context, null, { allOwnKeys: true });
 
   // Factory for creating new instances
   instance.create = function create(instanceConfig) {
@@ -53,9 +52,6 @@ axios.isCancel = isCancel;
 axios.VERSION = VERSION;
 axios.toFormData = toFormData;
 
-// Expose AxiosError class
-axios.AxiosError = AxiosError;
-
 // alias for CanceledError for backward compatibility
 axios.Cancel = axios.CanceledError;
 
@@ -69,8 +65,8 @@ axios.spread = spread;
 // Expose isAxiosError
 axios.isAxiosError = isAxiosError;
 
-axios.formToJSON = thing => {
+axios.formToJSON = (thing) => {
   return formDataToJSON(utils.isHTMLForm(thing) ? new FormData(thing) : thing);
 };
 
-export default axios
+export default axios;