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closes #4253 The `isNetworkError` function incorrectly classified XHR states as network errors. Per MDN, a network error occurs when a request completes (`readyState === 4`) but has no HTTP status (`status === 0`), indicating network/CORS/file access failures. ## Changes - **Logic fix**: Changed from `(xhr.readyState !== 0 && xhr.readyState !== 4) || xhr.status === 0` to `xhr.readyState === 4 && xhr.status === 0` - **Test update**: Removed invalid test expecting `readyState: 2` to be a network error; added test verifying incomplete requests return `false` ## Example ```typescript // Before: incorrectly treated in-progress requests as network errors isNetworkError({ readyState: 2, status: 0 }) // true ❌ // After: only completed requests with no status are network errors isNetworkError({ readyState: 4, status: 0 }) // true ✓ isNetworkError({ readyState: 2, status: 0 }) // false ✓ ``` <!-- START COPILOT CODING AGENT SUFFIX --> <details> <summary>Original prompt</summary> > Update the isNetworkError function in packages/@uppy/utils/src/isNetworkError.ts to correctly detect network errors according to MDN documentation. The new logic should return true only if xhr.readyState === 4 and xhr.status === 0. The updated implementation should be: > > function isNetworkError(xhr?: XMLHttpRequest): boolean { > if (!xhr) return false > // finished but status is 0 — usually indicates a network/CORS/file error > return xhr.readyState === 4 && xhr.status === 0 > } > > export default isNetworkError > > No other logic changes are needed. If you find related commentary (e.g., outdated comments), clarify as needed. </details> *This pull request was created as a result of the following prompt from Copilot chat.* > Update the isNetworkError function in packages/@uppy/utils/src/isNetworkError.ts to correctly detect network errors according to MDN documentation. The new logic should return true only if xhr.readyState === 4 and xhr.status === 0. The updated implementation should be: > > function isNetworkError(xhr?: XMLHttpRequest): boolean { > if (!xhr) return false > // finished but status is 0 — usually indicates a network/CORS/file error > return xhr.readyState === 4 && xhr.status === 0 > } > > export default isNetworkError > > No other logic changes are needed. If you find related commentary (e.g., outdated comments), clarify as needed. <!-- START COPILOT CODING AGENT TIPS --> --- ✨ Let Copilot coding agent [set things up for you](https://github.com/transloadit/uppy/issues/new?title=✨+Set+up+Copilot+instructions&body=Configure%20instructions%20for%20this%20repository%20as%20documented%20in%20%5BBest%20practices%20for%20Copilot%20coding%20agent%20in%20your%20repository%5D%28https://gh.io/copilot-coding-agent-tips%29%2E%0A%0A%3COnboard%20this%20repo%3E&assignees=copilot) — coding agent works faster and does higher quality work when set up for your repo. --------- Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com> Co-authored-by: mifi <402547+mifi@users.noreply.github.com> |
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