Node v20.12.x TypeError: fetch is not a function

[mkilpatrick]

Version

v20.12.2

Platform

Darwin mkilpatrick-mbp 21.6.0 Darwin Kernel Version 21.6.0: Mon Aug 22 20:19:52 PDT 2022; root:xnu-8020.140.49~2/RELEASE_ARM64_T6000 arm64

Subsystem

No response

What steps will reproduce the bug?

Using fetch is broken in Node v20.12.x. It works in v20.11.x.

How often does it reproduce? Is there a required condition?

No response

What is the expected behavior? Why is that the expected behavior?

No response

What do you see instead?

Using fetch results in TypeError: fetch is not a function

Additional information

No response

[VoltrexKeyva]

Can't reproduce, can't do much here without seeing your code that uses the function.

[tchetwin]

There's something stirring with fetch and v20.12.x:

• https://stackoverflow.com/questions/78304233/typeerror-cannot-assign-to-read-only-property-fetch-of-object-object-global
  • This points to Jest 29.7.0 as resolving, not sure what from the CHANGELOG
• npm test failing on Node 20 replicate/replicate-javascript#237
• [Node v21.7.0] Impossible to stub fetch sinonjs/sinon#2590
• Cannot stub fetch function using sinon in Node 20.12.x Real-Dev-Squad/website-backend#2011

Edit: this ships in Node 20.12.0: #51598 and does not define writable for fetch, implying it will be false:

https://github.com/nodejs/node/pull/51598/files#diff-cbe9ed0255d58a51cf6442116da17f833c9d57c6244dc1efa74760d1c91860e7R71-R72

[joyeecheung]

I think this will be fixed by #52275