bun patch fails if directory patches already exists

[hirbod]

What version of Bun is running?

1.1.45+196621f25

What platform is your computer?

Darwin 24.1.0 arm64 arm

What steps can reproduce the bug?

bun patch fails when the patches directory already exists.
Also, it has issues if something from "outside" (like react-native) created a cache directory inside node_modules (like an android/build folder)

What is the expected behavior?

It should continue and write to it. An existing folder should not be an issue

What do you see instead?

A failure.

error: failed applying patch file: EACCES: android/build/.transforms/81f9bf564efa7258c6d6ab2f84b128c6: Permission denied (mkdir())

or

EEXIST: File or folder exists: failed to make patches dir "patches" (mkdir)

Additional information

The EEXIST error is a "new" issue—at least, I couldn’t find any duplicates. However, the other issue (Permission denied) has been reported twice:

• bun patch fails with EACCES Permission denied mkdir() when adding new files in nested directory #13330
• bun patch fails to patch node_modules when the patch adds a new directory #13770

@Jarred-Sumner asked me to file this issue so that @dylan-conway can "probably fix it next week."

Here it is.

By the way, this is the only blocker for us. Migrating to Bun has been a fantastic experience—it worked seamlessly with React Native/Expo and significantly improved our workflow and CI times.

Please also consider adding an exclude pattern to bun patch so we can ignore folders like android/build inside node_modules/@shopify/flash-list/android/build. These folders are not shipped via npm but are created by React Native during Android builds, causing the permission issue and unnecessarily large patch files.