From 74c4a3a89970bbfc498c812790daef13766dea72 Mon Sep 17 00:00:00 2001
From: Artem Zakharchenko <kettanaito@gmail.com>
Date: Sat, 9 Nov 2024 18:37:51 +0100
Subject: [PATCH] fix(handleRequest): remove `transformResponse` option (#2351)

---
 src/core/utils/handleRequest.test.ts | 87 +---------------------------
 src/core/utils/handleRequest.ts      | 17 +-----
 2 files changed, 3 insertions(+), 101 deletions(-)

diff --git a/src/core/utils/handleRequest.test.ts b/src/core/utils/handleRequest.test.ts
index e3bbf3c1e..5e9e896c5 100644
--- a/src/core/utils/handleRequest.test.ts
+++ b/src/core/utils/handleRequest.test.ts
@@ -1,6 +1,4 @@
-/**
- * @vitest-environment jsdom
- */
+// @vitest-environment jsdom
 import { Emitter } from 'strict-event-emitter'
 import { createRequestId } from '@mswjs/interceptors'
 import { LifeCycleEventsMap, SharedOptions } from '../sharedOptions'
@@ -239,89 +237,6 @@ test('returns the mocked response for a request with a matching request handler'
   })
 })
 
-test('returns a transformed response if the "transformResponse" option is provided', async () => {
-  const { emitter, events } = setup()
-
-  const requestId = createRequestId()
-  const request = new Request(new URL('http://localhost/user'))
-  const mockedResponse = HttpResponse.json({ firstName: 'John' })
-  const handlers: Array<RequestHandler> = [
-    http.get('/user', () => {
-      return mockedResponse
-    }),
-  ]
-  const transformResponseImpelemntation = (response: Response): Response => {
-    return new Response('transformed', response)
-  }
-  const transformResponse = vi
-    .fn<[Response], Response>()
-    .mockImplementation(transformResponseImpelemntation)
-  const finalResponse = transformResponseImpelemntation(mockedResponse)
-  const lookupResult = {
-    handler: handlers[0],
-    response: mockedResponse,
-    request,
-    parsedResult: {
-      match: { matches: true, params: {} },
-      cookies: {},
-    },
-  }
-
-  const result = await handleRequest(
-    request,
-    requestId,
-    handlers,
-    options,
-    emitter,
-    {
-      ...handleRequestOptions,
-      transformResponse,
-    },
-  )
-
-  expect(result?.status).toEqual(finalResponse.status)
-  expect(result?.statusText).toEqual(finalResponse.statusText)
-  expect(Object.fromEntries(result!.headers.entries())).toEqual(
-    Object.fromEntries(mockedResponse.headers.entries()),
-  )
-
-  expect(events).toEqual([
-    ['request:start', { request, requestId }],
-    ['request:match', { request, requestId }],
-    ['request:end', { request, requestId }],
-  ])
-  expect(handleRequestOptions.onPassthroughResponse).not.toHaveBeenCalled()
-
-  expect(transformResponse).toHaveBeenCalledTimes(1)
-  const [responseParam] = transformResponse.mock.calls[0]
-
-  expect(responseParam.status).toBe(mockedResponse.status)
-  expect(responseParam.statusText).toBe(mockedResponse.statusText)
-  expect(Object.fromEntries(responseParam.headers.entries())).toEqual(
-    Object.fromEntries(mockedResponse.headers.entries()),
-  )
-
-  expect(handleRequestOptions.onMockedResponse).toHaveBeenCalledTimes(1)
-  const [mockedResponseParam, lookupResultParam] =
-    handleRequestOptions.onMockedResponse.mock.calls[0]
-
-  expect(mockedResponseParam.status).toBe(finalResponse.status)
-  expect(mockedResponseParam.statusText).toBe(finalResponse.statusText)
-  expect(Object.fromEntries(mockedResponseParam.headers.entries())).toEqual(
-    Object.fromEntries(mockedResponse.headers.entries()),
-  )
-  expect(await mockedResponseParam.text()).toBe('transformed')
-
-  expect(lookupResultParam).toEqual({
-    handler: lookupResult.handler,
-    parsedResult: lookupResult.parsedResult,
-    response: expect.objectContaining({
-      status: lookupResult.response.status,
-      statusText: lookupResult.response.statusText,
-    }),
-  })
-})
-
 it('returns undefined without warning on a passthrough request', async () => {
   const { emitter, events } = setup()
 
diff --git a/src/core/utils/handleRequest.ts b/src/core/utils/handleRequest.ts
index d78259c2e..1f5780bbc 100644
--- a/src/core/utils/handleRequest.ts
+++ b/src/core/utils/handleRequest.ts
@@ -22,12 +22,6 @@ export interface HandleRequestOptions {
     baseUrl?: string
   }
 
-  /**
-   * Transforms a `MockedResponse` instance returned from a handler
-   * to a response instance supported by the lower tooling (i.e. interceptors).
-   */
-  transformResponse?(response: Response): Response
-
   /**
    * Invoked whenever a request is performed as-is.
    */
@@ -118,16 +112,9 @@ export async function handleRequest(
   const requiredLookupResult =
     lookupResult.data as RequiredDeep<HandlersExecutionResult>
 
-  const transformedResponse =
-    handleRequestOptions?.transformResponse?.(response) ||
-    (response as any as Response)
-
-  handleRequestOptions?.onMockedResponse?.(
-    transformedResponse,
-    requiredLookupResult,
-  )
+  handleRequestOptions?.onMockedResponse?.(response, requiredLookupResult)
 
   emitter.emit('request:end', { request, requestId })
 
-  return transformedResponse
+  return response
 }