import type { Page } from 'playwright';
export declare function simHash32(text: string): number;
export declare function hammingDistance32(a: number, b: number): number;
export declare function normalizeUrl(raw: string): string;
export declare function computeStateId(normalizedUrl: string, hash: number): string;
export interface UIStateNode {
    id: string;
    url: string;
    normalizedUrl: string;
    title: string;
    interactiveElementCount: number;
    domFingerprint: string;
    simHashValue: number;
    visitedAt: string;
}
export interface StateTransition {
    fromId: string;
    toId: string;
    action: string;
    label: string;
    triggeredAt: string;
}
export interface CoverageReport {
    totalStates: number;
    totalTransitions: number;
    uniqueUrls: number;
    interactiveElementsTotal: number;
    estimatedCoveragePercent: number;
}
export declare function fingerprintPage(page: Page, visitedAt: string): Promise<{
    fingerprint: string;
    visibleText: string;
    interactiveCount: number;
    simHashValue: number;
}>;
export declare class ScreenTransitionGraph {
    private states;
    private transitions;
    /** Maps simHash value → array of state ids with that hash (for near-dup lookup) */
    private hashIndex;
    addState(node: UIStateNode): {
        added: boolean;
        duplicateOf?: string;
    };
    addTransition(fromId: string, toId: string, action: string, label: string, triggeredAt: string): void;
    isDuplicate(url: string, visibleText: string, threshold?: number): boolean;
    getCoverageReport(): CoverageReport;
    toJSON(): {
        states: UIStateNode[];
        transitions: StateTransition[];
    };
    static fromJSON(data: {
        states: UIStateNode[];
        transitions: StateTransition[];
    }): ScreenTransitionGraph;
    getState(id: string): UIStateNode | undefined;
    getAllStates(): UIStateNode[];
    getTransitionsFrom(id: string): StateTransition[];
}