import type { RefTable } from "./refs.js";
import type { CdpSend } from "./types.js";
export type ExtractFormat = "text" | "markdown" | "links";
export interface ExtractOptions {
    format?: ExtractFormat;
    selector?: string;
    maxChars?: number;
}
export interface ExtractResult {
    format: ExtractFormat;
    text: string;
    truncated: boolean;
}
export interface ScreenshotRegion {
    x: number;
    y: number;
    width: number;
    height: number;
}
export interface ScreenshotOptions {
    ref?: string;
    fullPage?: boolean;
    quality?: number;
    skipIfUnchanged?: boolean;
    /** Default jpeg. */
    format?: "jpeg" | "png";
    /** Part of the viewport to capture, in CSS pixels relative to the visible area. */
    region?: ScreenshotRegion;
    /** Output pixels per CSS pixel. 0.5 halves the image; 2 doubles a zoomed region. */
    scale?: number;
}
export interface ScreenshotResult {
    base64?: string;
    bytes: number;
    format: "jpeg" | "png";
    unchanged: boolean;
    /** Image size in pixels; known for png. */
    width?: number;
    height?: number;
}
export interface ViewportMetrics {
    width: number;
    height: number;
    scrollX: number;
    scrollY: number;
    devicePixelRatio: number;
}
/** Visible area size and scroll offset in CSS pixels, plus the device pixel ratio. */
export declare function readViewportMetrics(send: CdpSend, sessionId: string): Promise<ViewportMetrics>;
/** Width and height from a base64 PNG header, without decoding the image. */
export declare function pngSize(base64: string): {
    width: number;
    height: number;
} | null;
/** Page content as plain text, markdown or a link list. Reading never needs refs. */
export declare function extractContent(send: CdpSend, sessionId: string, opts?: ExtractOptions): Promise<ExtractResult>;
/** JPEG screenshot of the viewport, the full page, or one element. */
export declare function captureScreenshot(send: CdpSend, sessionId: string, refs: RefTable, opts?: ScreenshotOptions, previousHash?: string): Promise<{
    result: ScreenshotResult;
    hash: string;
}>;
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