export declare const HB_CONTRAST_TAG = "hb-contrast";
export declare const HB_CLIP_TAG = "hb-clip";
export declare const HB_BROKEN_ASSET_TAG = "hb-broken-asset";
export declare const HB_OVERLAP_TAG = "hb-overlap";
export declare const HB_MISALIGN_TAG = "hb-misalign";
export interface ContrastPayload {
    id: number;
    fg: string;
    bg: string;
    ratio: number;
    sample: string;
}
export interface ClipPayload {
    id: number;
    axis: 'x' | 'y';
    sample: string;
}
export interface OverlapPayload {
    id: number;
    id2: number;
    sample: string;
    sample2: string;
}
export interface BrokenAssetPayload {
    id: number;
    tag: string;
    url: string;
}
export interface MisalignPayload {
    id: number;
    sample: string;
}
interface RGBA {
    r: number;
    g: number;
    b: number;
    a: number;
}
export declare function contrastRatio(fg: RGBA, bg: RGBA): number;
export declare class ContrastCapture {
    private emit;
    private getId;
    private emitClip?;
    private emitOverlap?;
    private emitMisalign?;
    private emitBrokenAsset?;
    private emittedIds;
    private clippedIds;
    private overlapPairs;
    private misalignedIds;
    private brokenAssetUrls;
    private emitCount;
    private scanCount;
    private timer;
    constructor(emit: (payload: ContrastPayload) => void, getId: (node: Node) => number, emitClip?: ((payload: ClipPayload) => void) | undefined, emitOverlap?: ((payload: OverlapPayload) => void) | undefined, emitMisalign?: ((payload: MisalignPayload) => void) | undefined, emitBrokenAsset?: ((payload: BrokenAssetPayload) => void) | undefined);
    start(doc: Document, win: Window): void;
    scan(doc: Document, win: Window): void;
    private detectBrokenImages;
    private detectMisalignedTables;
    private detectOverlaps;
    dispose(): void;
}
export {};
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