TypeError: Cannot assign to read only property 'Headers' of object '[object Object]'

[ch-liuzhide]

I encountered the following error after updating the node_modules folder and then running the tests，

TypeError: Cannot assign to read only property 'Headers' of object '[object Object]'

      14 | describe('test/stream/client/xxx.tests.ts', () => {
      15 |   beforeAll(() => {
    > 16 |     server.listen();
         |            ^
      17 |   });
      18 |
      19 |   afterEach(() => {

      at recordRawFetchHeaders (node_modules/@mswjs/interceptors/lib/node/chunk-BMRE2LOX.js:157:3)
      at _ClientRequestInterceptor.setup (node_modules/@mswjs/interceptors/lib/node/chunk-BMRE2LOX.js:995:5)
      at _ClientRequestInterceptor.apply (node_modules/@mswjs/interceptors/lib/node/chunk-AABH3XLQ.js:75:10)
      at BatchInterceptor.setup (node_modules/@mswjs/interceptors/lib/node/chunk-PGTBKPWN.js:17:19)
      at BatchInterceptor.apply (node_modules/@mswjs/interceptors/lib/node/chunk-AABH3XLQ.js:75:10)
      at SetupServerApi.listen (node_modules/msw/lib/node/index.js:100:22)

Does anyone have similar mistakes? How should I deal with it?

[kallewatsch]

i had a similar error but it was Request instead of Headers
fixed it quick and dirty by changing my dependency in package.json
from "msw": "^2.3.5" to "msw": "2.3.5" (removed the carret to use exact version which is/was working for me)

[ctklc]

Same here with TypeError: Cannot assign to read only property 'Request' of object '[object Window]' error.

I fixed the version on 2.4.3. This error comes with 2.4.4 and still exist on 2.4.5

[betojsx]

Hi Im getting this error as well

Thanks a lot. I set 2.4.3 in my package-json and it worked

[kettanaito]

This looks like an MSW issue. I opened it in #2281, please track its progress there. Thanks.