import { Story, StorybookConnection, StoryPreviewBrowser } from '@prantlf/storycrawler';
import { MainOptions, RunMode } from './types.js';
import { VariantKey } from '../shared/types.js';
import { Logger } from './logger.js';
import { FileSystem } from './file.js';
/**
 *
 * Represents screenshot result.
 *
 * @remarks
 *
 * - If user's screenshot option has `skip: true`,`buffer` gets null and `succeeded` gets `true`
 * - `variantKeysToPush` is set an empty array if the capturing process is set not default variant key. It makes sense for only default variant.
 * - `defaultVariantSuffix` makes sense for only default variant too. It's set non-null value when user specifies multiple viewports.
 *
 **/
interface ScreenshotResult {
    buffer: Buffer | null;
    succeeded: boolean;
    variantKeysToPush: VariantKey[];
    defaultVariantSuffix?: string;
}
/**
 *
 * A worker to capture screenshot images.
 *
 **/
export declare class CapturingBrowser extends StoryPreviewBrowser {
    protected connection: StorybookConnection;
    protected opt: MainOptions;
    private mode;
    private currentStoryRetryCount;
    private viewport?;
    private emitter;
    private readonly processedStories;
    private baseScreenshotOptions;
    private currentRequestId;
    private currentVariantKey;
    private touched;
    private resourceWatcher;
    /**
     *
     * @override
     *
     * @param opt - Options for Storycap.
     * @param mode - Indicates this worker runs as managed mode or simple mode.
     * @param idx - Worker id.
     *
     **/
    constructor(connection: StorybookConnection, opt: MainOptions, mode: RunMode, idx: number);
    /**
     *
     * @override
     *
     **/
    boot(): Promise<this>;
    private addStyles;
    private expose;
    private reload;
    private waitIfTouched;
    private resetIfTouched;
    private subscribeScreenshotOptions;
    private waitForOptionsFromBrowser;
    private setViewport;
    private warnIfTargetElementNotFound;
    private setHover;
    private setFocus;
    private setClick;
    private waitForResources;
    private waitBrowserMetricsStable;
    private logInvalidVariantKeysReason;
    /**
     * Captures screenshot as a PNG image buffer from a story.
     *
     * @param requestId - Represents an identifier for the screenshot
     * @param variantKey - Variant identifier for the screenshot
     * @param retryCount - The number which represents how many attempting to capture this story and variant
     * @param logger - Logger instance
     * @param forwardConsoleLogs - Whether to forward logs from the page to the user's console
     * @param trace - Whether to record a CPU trace per screenshot
     *
     * @returns PNG buffer, whether the capturing process is succeeded or not, additional variant keys if they are emitted, and file name suffix for default the default variant.
     *
     * @remarks
     *
     * - Throws an error if `retryCount` is equal to `opt.captureMaxRetryCount` and this capturing process is failed
     *
     **/
    screenshot(requestId: string, story: Story, variantKey: VariantKey, retryCount: number, logger: Logger, forwardConsoleLogs: boolean, trace: boolean, fileSystem: FileSystem): Promise<ScreenshotResult>;
}
export {};