chore(setupWorker): detect readable stream support once

mswjs · Oct 15, 2023 · d54ad52 · d54ad52
1 parent 92c7ecc
commit d54ad52
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Showing 3 changed files with 8 additions and 2 deletions.
diff --git a/src/browser/setupWorker/glossary.ts b/src/browser/setupWorker/glossary.ts
@@ -147,6 +147,9 @@ export interface SetupWorkerInternalContext {
     >
   }
   useFallbackMode: boolean
+  supports: {
+    readableStreamTransfer: boolean
+  }
   fallbackInterceptor?: Interceptor<HttpRequestEventMap>
 }
 

diff --git a/src/browser/setupWorker/setupWorker.ts b/src/browser/setupWorker/setupWorker.ts
@@ -20,6 +20,7 @@ import { SetupApi } from '~/core/SetupApi'
 import { mergeRight } from '~/core/utils/internal/mergeRight'
 import { LifeCycleEventsMap } from '~/core/sharedOptions'
 import { SetupWorker } from './glossary'
+import { supportsReadableStreamTransfer } from '../utils/supportsReadableStreamTransfer'
 
 interface Listener {
   target: EventTarget
@@ -144,6 +145,9 @@ export class SetupWorkerApi
       },
       useFallbackMode:
         !('serviceWorker' in navigator) || location.protocol === 'file:',
+      supports: {
+        readableStreamTransfer: supportsReadableStreamTransfer(),
+      },
     }
 
     /**

diff --git a/src/browser/setupWorker/start/createRequestListener.ts b/src/browser/setupWorker/start/createRequestListener.ts
@@ -12,7 +12,6 @@ import { handleRequest } from '~/core/utils/handleRequest'
 import { RequiredDeep } from '~/core/typeUtils'
 import { devUtils } from '~/core/utils/internal/devUtils'
 import { toResponseInit } from '~/core/utils/toResponseInit'
-import { supportsReadableStreamTransfer } from '../../utils/supportsReadableStreamTransfer'
 
 export const createRequestListener = (
   context: SetupWorkerInternalContext,
@@ -53,7 +52,7 @@ export const createRequestListener = (
              * @note Safari doesn't support transferring a "ReadableStream".
              * Check that the browser supports that before sending it to the worker.
              */
-            if (supportsReadableStreamTransfer()) {
+            if (context.supports.readableStreamTransfer) {
               const responseStream = response.body
               messageChannel.postMessage(
                 'MOCK_RESPONSE',