/**
 * Scenario helpers — `defineScenario` is a tiny convenience that
 * validates step names are unique (so the step rollup in `LoadReport`
 * is unambiguous) and gives a typed entry point.
 *
 * The think-time picker lives here so workers and tests can both use
 * it without pulling in the runner. It uses the standard global
 * `Math.random` — load runs are not seeded for determinism on purpose
 * (workers running with the same think-time pattern defeat the point
 * of load testing).
 */
import type { Scenario, ScenarioStep, ThinkTime } from "./types.js";
export declare function defineScenario(spec: {
    name: string;
    steps: ReadonlyArray<ScenarioStep>;
    thinkTime?: ThinkTime;
    beforeIteration?: Scenario["beforeIteration"];
    afterIteration?: Scenario["afterIteration"];
}): Scenario;
/** Pick a think-time wait in ms, honouring an override chain. */
export declare function pickThinkTimeMs(...overrides: ReadonlyArray<ThinkTime | undefined>): number;
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