import { type BrowserDriver, type DriverNeed } from "./driver.js";
export interface SelectOptions {
    /** what the workload requires; an engine is only picked if it satisfies all. */
    need?: DriverNeed;
    /** caller's preference; overridden by env SLOWCOOK_BROWSER. Default: playwright. */
    prefer?: "playwright" | "rustwright";
    /** override the env lookup (tests). */
    env?: NodeJS.ProcessEnv;
}
export interface Selection {
    driver: BrowserDriver;
    /** true when the preferred engine was used; false when we failed over. */
    usedPreferred: boolean;
    /** human-readable why, for logs. */
    reason: string;
}
/** Resolve which engine to use. env SLOWCOOK_BROWSER (playwright|rustwright) wins
 *  over `prefer`; the result is Playwright unless rustwright is preferred, fits,
 *  and is installed. NEVER throws for a missing rustwright — it fails over. */
export declare function selectDriver(opts?: SelectOptions): Promise<Selection>;
//# sourceMappingURL=select.d.ts.map