/** A user-visible operation that may take long enough to need status UI. */
export interface BlitActivity {
    id: number;
    kind: "upload" | "download" | "sync" | "search" | "operation";
    /** The item being acted on: normally a file name or path. */
    label: string;
    /** Optional destination/source, such as a surface title or terminal cwd. */
    target?: string;
    /** Completed and total work in producer-defined units (bytes for uploads). */
    completed?: number;
    total?: number;
    startedAt: number;
}
export interface BlitActivityUpdate {
    label?: string;
    target?: string;
    completed?: number;
    total?: number;
}
export interface BlitActivityHandle {
    readonly id: number;
    update(update: BlitActivityUpdate): void;
    finish(): void;
}
/** Workspace-scoped registry consumed by status bars and other shell chrome.
 * Producers own handles, update them as work advances, and always finish them
 * on success, failure, or cancellation. */
export declare class BlitActivityStore {
    private readonly records;
    private readonly listeners;
    private snapshot;
    private nextId;
    subscribe: (listener: () => void) => (() => void);
    getSnapshot: () => readonly BlitActivity[];
    begin(activity: Omit<BlitActivity, "id" | "startedAt">): BlitActivityHandle;
    clear(): void;
    private emit;
}
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