import type { Scenario, TargetSpec, UserSpec } from './scenario.js';
/**
 * A per-stand overlay: overrides the scenario's `target` (e.g. `url`), `vars`
 * (e.g. credentials), and per-user `auth` args. Run the SAME scenario against a
 * different stand by swapping `--config`.
 */
export interface OverlayConfig {
    target?: Partial<TargetSpec>;
    vars?: Record<string, unknown>;
    users?: Record<string, UserSpec>;
}
/** Parse a YAML config-overlay file. */
export declare function loadConfig(path: string): OverlayConfig;
/** Deep-merge an overlay onto a scenario (overlay wins); returns a new scenario. */
export declare function applyOverlay(scenario: Scenario, overlay: OverlayConfig): Scenario;
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