/**
 * Notify a parent whenever an upload widget's in-progress state flips. Used by
 * hosts that must block a submit until the presigned upload resolves — e.g.
 * `ActionParamDialog` disables Confirm so a `file`/`image` param can't be
 * submitted mid-upload (the value only becomes the fileId once the upload
 * settles). Fires with the latest callback and only when `uploading` actually
 * changes, so an inline arrow prop doesn't thrash the parent every render.
 */
export declare function useUploadingSignal(uploading: boolean, onUploadingChange?: (uploading: boolean) => void): void;