feat(remix-node): callback functions that enable the integration of upload progress tracking

[akoenig]

I needed a method to tap into the real-time progress of file uploads, enabling me to enhance the user experience by streaming the live upload progress to my users. I documented this process in a blog post and believe that contributing these changes could be valuable.

• Docs (JSDoc for the newly added callback functions)

Testing Strategy:

Create a new fileUploadHandler, define the callback functions and see the progress printed via console.log:

createFileUploadHandler({
  onProgress({ name, filename, contentType, uploadedBytes }) {
    console.log(`Uploaded ${uploadedBytes} bytes.`);
  },
  onDone({ name, filename, contentType, uploadedBytes }) {
    console.log(`Successfully uploaded ${filename}.`);
  }
});

[remix-cla-bot]

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- The Remix team

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[remix-cla-bot]

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