Allow usage of a custom axios instance

docs/axios-support.md

@@ -24,3 +24,51 @@ in your `tsconfig.json` file:
     }
 }
 ```
+
+
+## Using a custom Axios client
+
+Sometime you may want to use your own Axios client created by `axios.create` for advanced configuration (e.g. Usage of the popular [axios-retry](https://github.com/softonic/axios-retry) interceptor) without having to [reimplement](./custom-request-file.md) the entire generated Axios request function.
+
+In those cases, simply construct your own HttpRequest wrapper implementation and pass it into your API client
+
+## Example
+
+Create a file that looks like this, that references file from the `/core` folder of the generated client.
+
+```typescript
+
+import axios from 'axios';
+import axiosRetry from 'axios-retry';
+import { request as __request } from './request';
+import { CancelablePromise } from './CancelablePromise';
+import { BaseHttpRequest } from './BaseHttpRequest';
+import { ApiRequestOptions } from './ApiRequestOptions';
+import type { OpenAPIConfig } from './OpenAPI';
+
+
+export class AxiosHttpRequestWithRetry extends BaseHttpRequest {
+  axiosInstance = axios.create();
+
+  constructor(config: OpenAPIConfig) {
+    super(config);
+    axiosRetry(this.axiosInstance);
+  }
+
+  public override request<T>(options: ApiRequestOptions): CancelablePromise<T> {
+    return __request(this.config, options, this.axiosInstance);
+  }
+}
+
+```
+
+Then, when instantiating your generated test client, pass in your custom request wrapper class:
+
+```typescript
+
+import { AxiosHttpRequestWithRetry } from './AxiosRequestWithRetry';
+import { GeneratedClient } from './generated/client';
+
+const client = new GeneratedClient({ BASE: 'http://localhost:8123' }, AxiosHttpRequestWithRetry)
+
+```

src/templates/core/axios/request.hbs

@@ -1,7 +1,7 @@
 {{>header}}
 
 import axios from 'axios';
-import type { AxiosError, AxiosRequestConfig, AxiosResponse } from 'axios';
+import type { AxiosError, AxiosRequestConfig, AxiosResponse, AxiosInstance } from 'axios';
 import FormData from 'form-data';
 
 import { ApiError } from './ApiError';
@@ -66,10 +66,11 @@ import type { OpenAPIConfig } from './OpenAPI';
  * Request method
  * @param config The OpenAPI configuration object
  * @param options The request options from the service
+ * @param axiosClient The axios client instance to use
  * @returns CancelablePromise<T>
  * @throws ApiError
  */
-export const request = <T>(config: OpenAPIConfig, options: ApiRequestOptions): CancelablePromise<T> => {
+export const request = <T>(config: OpenAPIConfig, options: ApiRequestOptions, axiosClient: AxiosInstance = axios): CancelablePromise<T> => {
 	return new CancelablePromise(async (resolve, reject, onCancel) => {
 		try {
 			const url = getUrl(config, options);
@@ -78,7 +79,7 @@ export const request = <T>(config: OpenAPIConfig, options: ApiRequestOptions): C
 			const headers = await getHeaders(config, options, formData);
 
 			if (!onCancel.isCancelled) {
-				const response = await sendRequest<T>(config, options, url, body, formData, headers, onCancel);
+				const response = await sendRequest<T>(config, options, url, body, formData, headers, onCancel, axiosClient);
 				const responseBody = getResponseBody(response);
 				const responseHeader = getResponseHeader(response, options.responseHeader);
 

src/templates/core/axios/sendRequest.hbs

@@ -5,7 +5,8 @@ const sendRequest = async <T>(
 	body: any,
 	formData: FormData | undefined,
 	headers: Record<string, string>,
-	onCancel: OnCancel
+	onCancel: OnCancel,
+	axiosClient: AxiosInstance
 ): Promise<AxiosResponse<T>> => {
 	const source = axios.CancelToken.source();
 
@@ -21,7 +22,7 @@ const sendRequest = async <T>(
 	onCancel(() => source.cancel('The user aborted a request.'));
 
 	try {
-		return await axios.request(requestConfig);
+		return await axiosClient.request(requestConfig);
 	} catch (error) {
 		const axiosError = error as AxiosError<T>;
 		if (axiosError.response) {