import type { ArkmeFilePolicy, ArkmeLocalFile } from '../file-transfer-contract.js';
import { type ArkmeComposerAttachment } from './composer-draft-store.js';
export interface AttachmentPreparationPort {
    get(): readonly ArkmeComposerAttachment[];
    update(change: (items: readonly ArkmeComposerAttachment[]) => readonly ArkmeComposerAttachment[]): void;
    current(): boolean;
    policy(signal: AbortSignal): Promise<ArkmeFilePolicy>;
    stage(file: File, signal: AbortSignal): Promise<ArkmeLocalFile>;
    discard(file: ArkmeLocalFile): Promise<unknown>;
    imagesOnly?: boolean;
}
/** File selection is synchronous; only preparation is queued. No File/blob URL is persisted. */
export declare class AttachmentPreparationQueue {
    private readonly port;
    private jobs;
    private tail;
    private disposed;
    constructor(port: AttachmentPreparationPort);
    add(files: readonly File[]): void;
    private present;
    private state;
    private enqueue;
    private retry;
    private cancel;
    dispose(): void;
    settled(): Promise<void>;
}
export declare function prepareComposerAttachments(key: string, userId: number, files: readonly File[], imagesOnly?: boolean): void;
export declare function attachmentPreparationHint(attachments: readonly ArkmeComposerAttachment[]): string | undefined;
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