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fix: keep FileList intact in flatten, expand it in jsonToFormData, skip undefined - #13725
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bluebill1049 merged 2 commits intoSep 10, 2026
Merged
bluebill1049 merged 2 commits into
bluebill1049 merged 2 commits into
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bluebill1049
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Sep 10, 2026
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Fixes #13724.
flatten()now treatsFileListas a leaf (same guard 🐞 fix(flatten): preserve File and Blob values as leaf nodes #13652 added forFile/Blob), so file fields are no longer split intofield.0keys.jsonToFormData()appends each file in aFileListunder its own field name (matching native form submission) and skipsundefinedvalues instead of stringifying them.Verified: new tests in
flatten.test.ts/formData.test.tsfail on master (3 failures) and pass with the fix; neighbor suites (form.test.tsx,extractFormValues) pass,tsc --noEmitandeslintare clean.