import type { LaunchOptions } from 'playwright';
export declare const HEADLESS_GL_ARGS: string[];
export type BrowserKey = 'bundled' | 'chrome' | 'msedge';
export type BrowserCandidate = {
    key: BrowserKey;
    label: string;
    launchOptions: LaunchOptions;
};
export declare function browserCandidates(): BrowserCandidate[];
export declare function selectBrowserCandidates(browser: BrowserKey | undefined): BrowserCandidate[];
export type LaunchAttempt = {
    key: BrowserKey;
    label: string;
    message: string;
};
export declare function composeLaunchFailure(attempts: LaunchAttempt[]): string;
export type HelperTimeoutState = 'absent' | 'present';
export type TimeoutAdvice = {
    absent: string;
    present: string;
};
export declare function composeTimeoutDiagnosisWith(state: HelperTimeoutState, errors: string[], advice: TimeoutAdvice): string;