export interface PartitionedAttachmentFiles {
    readonly nativeImages: readonly File[];
    readonly ordinaryFiles: readonly File[];
}
export interface NativeImageSink {
    add(files: readonly File[]): void;
}
export interface OrdinaryFileQueue {
    enqueue(sessionId: string, files: Iterable<File>): readonly string[] | void;
}
export declare function partitionAttachmentFiles(files: Iterable<File>): PartitionedAttachmentFiles;
export declare class FileIntakeCoordinator {
    private readonly queue;
    private readonly nativeImageSinks;
    constructor(queue: OrdinaryFileQueue);
    registerNativeImageSink(sessionId: string, sink: NativeImageSink): () => void;
    accept(sessionId: string, files: Iterable<File>): void;
}