export declare const CSS_SNAPSHOT_TAG = "hb-css-snapshot";
export interface CssSnapshotPayload {
    href: string;
    cssText: string;
}
type FetchLike = (input: string, init?: RequestInit) => Promise<{
    ok: boolean;
    text(): Promise<string>;
}>;
export declare function unreadableStylesheetHrefs(doc: Document): string[];
export declare class CssSnapshotCapture {
    private emit;
    private fetchImpl?;
    private captured;
    private bytesSent;
    private rescanTimer;
    constructor(emit: (payload: CssSnapshotPayload) => void, fetchImpl?: FetchLike | undefined);
    captureFromDocument(doc: Document): void;
    capture(hrefs: string[]): Promise<void>;
    dispose(): void;
}
export {};
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