Summary:
The original reason for vendoring the fetch polyfill was to remove the default blob response type but this was reverted.
Here's a little history around the fetch polyfill and the blob issue:
- Original commit introducing the vendored polyfill: #19333, the goal was to fix a memory leak because our blob implementation doesn't release resources automatically. Not an ideal fix but since the issue was pretty severe and the infra for a proper fix was not in place.
- This introduced an issue when downloading images using `fetch` which was fixed by #22063 which re-added the default blob content type. However that re-introduced the original fetch memory leak.
- We have better infra now with jsi and I was able to get blob deallocation working, see #24405
Currently the vendored fetch polyfill is useless since it was changed back to the original version. We can just use the npm version again. I also updated to 3.0 which brings better spec compliance and support for cancellation via `AbortController`, https://github.com/github/fetch/releases/tag/v3.0.0.
## Changelog
[General] [Changed] - Remove vendored fetch polyfill, update to whatwg-fetch@3.0
Pull Request resolved: https://github.com/facebook/react-native/pull/24418
Differential Revision: D14932683
Pulled By: cpojer
fbshipit-source-id: 915e3d25978e8b9d7507ed807e7fba45aa88385a
Summary: Split up InitializeCore into a bunch of modules. The idea here is to make it easier for apps to just get the initialization logic they want and leave behind what they don't; for example, if you don't want the Map/Set polyfills, instead of requiring InitializeCore you can require the modules you want from it.
Reviewed By: yungsters
Differential Revision: D10842564
fbshipit-source-id: 3b12d54fddea8c4ee75886022338c214987a015c
Andres Suarez
Janic Duplessis
Emily Janzer