Allow requests to override 'fetch'

package.json

@@ -56,7 +56,7 @@
         "eslint": "eslint .",
         "eslint:fix": "eslint . --fix",
         "prepublishOnly": "npm run clean && npm run release",
-        "codecov": "codecov --token=66c30c23-8954-4892-bef9-fbaed0a2e42b"
+        "codecov": "codecov"
     },
     "dependencies": {
         "camelcase": "^6.3.0",

src/templates/core/node/request.hbs

@@ -67,7 +67,7 @@ import type { OpenAPIConfig } from './OpenAPI';
  * @returns CancelablePromise<T>
  * @throws ApiError
  */
-export const request = <T>(config: OpenAPIConfig, options: ApiRequestOptions): CancelablePromise<T> => {
+export const request = <T>(config: OpenAPIConfig, options: ApiRequestOptions, fetchFunction?: typeof fetch): CancelablePromise<T> => {
 	return new CancelablePromise(async (resolve, reject, onCancel) => {
 		try {
 			const url = getUrl(config, options);
@@ -76,7 +76,7 @@ export const request = <T>(config: OpenAPIConfig, options: ApiRequestOptions): C
 			const headers = await getHeaders(config, options);
 
 			if (!onCancel.isCancelled) {
-				const response = await sendRequest(options, url, body, formData, headers, onCancel);
+				const response = await sendRequest(options, url, body, formData, headers, onCancel, fetchFunction);
 				const responseBody = await getResponseBody(response);
 				const responseHeader = getResponseHeader(response, options.responseHeader);
 

src/templates/core/node/sendRequest.hbs

@@ -4,7 +4,8 @@ export const sendRequest = async (
 	body: any,
 	formData: FormData | undefined,
 	headers: Headers,
-	onCancel: OnCancel
+	onCancel: OnCancel,
+	fetchFunction: typeof fetch = fetch
 ): Promise<Response> => {
 	const controller = new AbortController();
 
@@ -17,5 +18,5 @@ export const sendRequest = async (
 
 	onCancel(() => controller.abort());
 
-	return await fetch(url, request);
+	return await fetchFunction(url, request);
 };

test/e2e/client.node.spec.ts

@@ -1,3 +1,4 @@
+import fetch from 'node-fetch';
 import { cleanup } from './scripts/cleanup';
 import { compileWithTypescript } from './scripts/compileWithTypescript';
 import { generateClient } from './scripts/generateClient';
@@ -147,4 +148,32 @@ describe('client.node', () => {
             })
         );
     });
+
+    it('can override fetch', async () => {
+        const tokenRequest = jest.fn().mockResolvedValue('MY_TOKEN');
+        const { ApiClient, BaseHttpRequest } = require('./generated/client/node/index.js');
+        const { request } = require('./generated/client/node/core/request');
+        const customFetch = jest.fn().mockImplementation((url, init) => fetch(url, init));
+        class MockHttpRequest extends BaseHttpRequest {
+            constructor(config) {
+                super(config);
+            }
+
+            public request<T>(options) {
+                return request(this.config, options, customFetch);
+            }
+        }
+        const client = new ApiClient(
+            {
+                TOKEN: tokenRequest,
+                USERNAME: undefined,
+                PASSWORD: undefined,
+            },
+            MockHttpRequest
+        );
+        const result = await client.simple.getCallWithoutParametersAndResponse();
+        expect(tokenRequest.mock.calls.length).toBe(1);
+        expect(customFetch.mock.calls.length).toBe(1);
+        expect(result.headers.authorization).toBe('Bearer MY_TOKEN');
+    });
 });