import type { Fixtures, Page, PlaywrightTestArgs } from '@playwright/test';
/**
 * The browser state a test's page loads under, set by the `variance` fixture
 * before the test body runs.
 *
 * A page reads its clock and its motion preference in its first script, so an
 * observation, which comes after the test has navigated, is too late to set
 * either. The fixture is not: it hands the test its `page`, and the test
 * navigates after. The pointer is not set here, because a test moves it; it is
 * taken off the page before each reading instead.
 */
export interface VarianceDriveFixtures {
    /**
     * Stabilization tricks the fixture applies to the test's page before the test
     * body, by id. Defaults to `COLLECT_RECIPE`, which holds `reduced-motion` and
     * `freeze-clock`.
     *
     * Name a list without either to load the page as the browser would: keep
     * `freeze-clock` out when your test sets `page.clock` itself.
     */
    readonly varianceStabilize: readonly string[] | undefined;
    /**
     * The instant `freeze-clock` fixes `Date` at, as an ISO 8601 instant with its
     * zone. Defaults to `2024-06-15T12:00:00.000Z`.
     */
    readonly varianceNow: string | undefined;
    /**
     * The ids {@link driveBeforeTest} set on the test's `page`, as
     * `varianceStabilize` and `varianceNow` asked. The `variance` fixture depends
     * on it, so the page is driven before the test body runs, and every
     * observation records the ids its own list names.
     */
    readonly varianceDriven: readonly string[];
}
export declare const varianceDriveFixtures: Fixtures<VarianceDriveFixtures, object, PlaywrightTestArgs>;
/**
 * Set the clock and the motion preference on a page before it loads, and
 * answer the ids set.
 *
 * The `variance` fixture calls this on the page it hands a test. Call it
 * yourself, before `page.goto()`, on a page the fixture never handed you, such
 * as one opened from your own `browser.newContext()`. `stabilize` and `now` are
 * `varianceStabilize` and `varianceNow`.
 *
 * Everything but the pointer: {@link driveBeforeLoad} also moves it, which
 * costs a frame, and a test moves it again before any reading would see it.
 */
export declare function driveBeforeTest(page: Page, options?: {
    readonly stabilize?: readonly string[] | undefined;
    readonly now?: string | undefined;
}): Promise<readonly string[]>;
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