fix: give expo File uploads a filesystem uri (closes #1057) - #1295
fix: give expo File uploads a filesystem uri (closes #1057)#1295dewa3355 wants to merge 2 commits into
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Included review availability: Your plan provides up to 8 included reviews per hour; 7 remain after this review. WalkthroughExpo upload helpers now convert ChangesExpo file upload handling
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: ⚪ Minimal · up to Expo upload helpers now convert files to filesystem-backed URI wrappers before upload, including files replaced by upload callbacks. No current merge-blocking risk remains. Sequence Diagram(s)sequenceDiagram
participant App
participant ExpoHelpers
participant toRNFormDataFile
participant ExpoFileSystem
participant UploadThing
App->>ExpoHelpers: Call startUpload or uploadFiles
ExpoHelpers->>toRNFormDataFile: Convert each File
toRNFormDataFile->>ExpoFileSystem: Write missing-URI file bytes to cache
ExpoFileSystem-->>toRNFormDataFile: Return filesystem URI
toRNFormDataFile-->>ExpoHelpers: Return FormData-compatible wrapper
ExpoHelpers->>UploadThing: Delegate upload with converted files
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Confidence Score: 4/5The callback replacement path still produces invalid React Native upload files and should be fixed before merging; generated cache files should also be cleaned up. Conversion runs before a supported file-replacement callback, allowing the actual uploaded files to bypass URI attachment, while repeated direct uploads also leave full temporary copies in the Expo cache. Files Needing Attention: packages/expo/src/index.ts, packages/expo/src/rn-formdata.ts Important Files Changed
Prompt To Fix All With AI### Issue 1
packages/expo/src/index.ts:93-94
**Replacement files bypass URI conversion**
When `onBeforeUploadBegin` returns replacement `File` objects, this wrapper has already performed native conversion, so the returned files reach React Native FormData without filesystem URIs and produce zero-byte, invalid-size, or failed uploads.
### Issue 2
packages/expo/src/rn-formdata.ts:64-69
**Generated cache files remain**
Each URI-less upload writes a complete copy to a unique cache path, but no success, failure, or abort path removes it, so repeated direct uploads continually consume application cache storage until the operating system evicts the files or later writes fail.
---
For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.Reviews (1): Last reviewed commit: "fix: give expo File uploads a filesystem..." | Re-trigger Greptile |
![greptile-apps[bot]](https://avatars.githubusercontent.com/in/867647?s=60&v=4){kind=small}
| const uri = `${cacheDirectory}${Date.now()}-${Math.random()}-${basename}`; | ||
| await FileSystem.writeAsStringAsync( | ||
| uri, | ||
| arrayBufferToBase64(await file.arrayBuffer()), | ||
| { encoding: FileSystem.EncodingType.Base64 }, | ||
| ); |
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Each URI-less upload writes a complete copy to a unique cache path, but no success, failure, or abort path removes it, so repeated direct uploads continually consume application cache storage until the operating system evicts the files or later writes fail.
Knowledge Base Used: Expo SDK
Prompt To Fix With AI
This is a comment left during a code review.
Path: packages/expo/src/rn-formdata.ts
Line: 64-69
Comment:
**Generated cache files remain**
Each URI-less upload writes a complete copy to a unique cache path, but no success, failure, or abort path removes it, so repeated direct uploads continually consume application cache storage until the operating system evicts the files or later writes fail.
**Knowledge Base Used:** [Expo SDK](https://app.greptile.com/t3/-/custom-context/knowledge-base/pingdotgg/uploadthing/-/docs/expo-sdk.md)
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For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.There was a problem hiding this comment.
Skipping for now — OS cache eviction covers these unique paths, and wiring delete-on-success/abort through FormData upload lifecycle is a larger change than this PR. Happy to follow up in a dedicated issue if maintainers want it.
![coderabbitai[bot]](https://avatars.githubusercontent.com/in/347564?s=60&v=4){kind=small}
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Actionable comments posted: 1
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Inline comments:
In `@packages/expo/src/rn-formdata.ts`:
- Line 41: Update toRNFormDataFile so it does not mutate the input File or
assign name/type directly; return a separate FormData-compatible wrapper
inheriting from the original file’s prototype while applying the requested
properties safely, preserving compatibility with getter-only File properties.
After applying the fix, consider running `coderabbit review --agent` for local
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Fix all unresolved CodeRabbit comments on this PR:
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Wrap files instead of Object.assign so getter-only name/type on React Native 0.74 File cannot throw, and convert after onBeforeUploadBegin so replacement files still get filesystem URIs. Co-authored-by: dewa3355 <dewa3355@users.noreply.github.com>
2 participants
React Native FormData cannot upload a web
File/Blobunless the object has a filesystemuri.@uploadthing/expocurrently spreads webgenerateReactHelpers, souseUploadThing/uploadFilessendnew File(...)values with nouriand the object lands as 0 bytes /NaNundefined.This wraps those two helpers so every file that is actually uploaded goes through
toRNFormDataFile:uri(picker assets), we return a FormData-compatible wrapper with own{ uri, type, name }and keep that path. We do notObject.assignonto the inputFile(React Native 0.74name/typeare getter-only).Date.now()+Math.random()+ basename) withexpo-file-systemand attach thaturi. Nodata:URIs.useUploadThingconverts afteronBeforeUploadBegin, so replacement files also get URIs.uploadFileshas no such callback and converts the files it receives.useImageUploaderanduseDocumentUploaderare unchanged — they already callObject.assign(file, { uri }).Closes #1057
Review follow-up
Addresses CodeRabbit P1 (do not mutate getter-only
Fileproperties) and Greptile P1 (convert files afteronBeforeUploadBeginreplacements). Cache-file cleanup after upload was skipped: it needs lifecycle hooks on success/failure/abort and would expand this patch.Summary by CodeRabbit
FormDatacompatibility.