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fix: Cloud files throwing error on upload #685

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fix: Cloud files throwing error on upload #685

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fix: Cloud files throwing error on upload
divyeshagrawal Nov 30, 2025
23d4fbb
fix: Update type of cacheFiles function and mock arrayBuffer properly
divyeshagrawal Nov 30, 2025
13ffe37
fix: Update mock of arrayBuffer
divyeshagrawal Nov 30, 2025
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24 changes: 22 additions & 2 deletions src/AjaxUploader.tsx
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Original file line number Diff line number Diff line change
Expand Up @@ -170,8 +170,28 @@ class AjaxUploader extends Component<UploadProps> {
}
}

uploadFiles = (files: File[]) => {
const originFiles = [...files] as RcFile[];
cacheFiles = async (files: File[]): Promise<RcFile[]> => {
if (files?.length) {
const filesArray = [...files];

const cachedFiles = await Promise.all(
filesArray.map(async file => {
const buffer = await file.arrayBuffer();
return new File([buffer], file.name, {
type: file.type,
lastModified: file.lastModified,
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@afc163 afc163 Dec 12, 2025

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Other file attributes would be lost.

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@divyeshagrawal divyeshagrawal Dec 13, 2025 •
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Screenshot from 2025-12-13 19-54-43

I’ve attached a screenshot after printing the original and cloned File objects, and I don’t see any difference in their attributes. Please let me know if I’m missing something.

});
Comment on lines +178 to +181
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Copilot AI Jan 5, 2026

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The cacheFiles method only preserves name, type, and lastModified properties when recreating File objects. Other potentially important File properties like webkitRelativePath (used for directory uploads) and size are not preserved. This could cause issues for directory uploads or code that relies on file.size. Consider preserving all relevant File properties or using a more comprehensive approach to copy file properties.

Suggested change
return new File([buffer], file.name, {
type: file.type,
lastModified: file.lastModified,
});
const clonedFile = new File([buffer], file.name, {
type: file.type,
lastModified: file.lastModified,
});
// Preserve additional own properties (e.g. webkitRelativePath) from the original File
const ownProps = Object.getOwnPropertyNames(file);
ownProps.forEach(prop => {
// Skip properties already handled by the File constructor
if (prop === 'name' || prop === 'type' || prop === 'lastModified' || prop === 'size') {
return;
}
try {
const desc = Object.getOwnPropertyDescriptor(file, prop);
if (desc) {
// Avoid redefining non-configurable properties on the cloned file
Object.defineProperty(clonedFile, prop, desc);
} else {
(clonedFile as any)[prop] = (file as any)[prop];
}
} catch {
// Silently ignore properties that cannot be reassigned (e.g. read-only, non-configurable)
}
});
return clonedFile;

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}),
);

return cachedFiles as RcFile[];
}

return [];
};

uploadFiles = async (files: File[]) => {
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Copilot AI Jan 5, 2026

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The uploadFiles method has been changed to async but none of its call sites await it (lines 64, 106, 114). This means errors thrown in cacheFiles or during the async upload process won't be caught properly and could result in unhandled promise rejections. The calls should either be awaited with proper error handling, or uploadFiles should handle errors internally.

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const originFiles = await this.cacheFiles(files);
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@gemini-code-assist gemini-code-assist bot Nov 30, 2025

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medium

The cacheFiles function is declared to return a Promise<RcFile[]>, but the File objects created inside do not have a uid property, so they are not RcFiles. Casting cachedFiles as RcFile[] on line 187 is type-unsafe. The function should promise File[] instead. The casting can be moved to uploadFiles.

Also, filesArray on line 175 is a redundant copy of the files array and can be removed.

  cacheFiles = async (files: File[]): Promise<File[]> => {
    if (files?.length) {
      const cachedFiles = await Promise.all(
        files.map(async file => {
          const buffer = await file.arrayBuffer();
          return new File([buffer], file.name, {
            type: file.type,
            lastModified: file.lastModified,
          });
        }),
      );

      return cachedFiles;
    }

    return [];
  };

  uploadFiles = async (files: File[]) => {
    const originFiles = (await this.cacheFiles(files)) as RcFile[];

const postFiles = originFiles.map((file: RcFile & { uid?: string }) => {
// eslint-disable-next-line no-param-reassign
file.uid = getUid();
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