Extending the dropzone (plugins)

The hook accepts a getFilesFromEvent prop that lets you customize how dropped file-system objects are handled — e.g. resolving a dropped folder to an array of files.

The provided function must return a Promise with a list of File objects (or DataTransferItem of {kind: 'file'}). To add properties to a File, use Object.defineProperty() so the result still passes through the internal filter:

Drag 'n' drop some files here, or click to select files

async function myCustomFileGetter(event) {
  const files = [];
  const fileList = event.dataTransfer ? event.dataTransfer.files : event.target.files;
 
  for (let i = 0; i < fileList.length; i++) {
    const file = fileList.item(i);
    Object.defineProperty(file, "myProp", {value: true});
    files.push(file);
  }
 
  return files;
}
 
function Plugin() {
  const {acceptedFiles, getRootProps, getInputProps} = useDropzone({
    getFilesFromEvent: event => myCustomFileGetter(event)
  });
  // ...render acceptedFiles, each with f.myProp
}