/**
 * @file
 *
 * Picks the running emulator that belongs to a named AVD.
 *
 * A capture suite must never take "the first device `adb devices` lists". Two
 * things routinely make that the wrong device on a machine running these
 * suites: a physical phone is often plugged in alongside, and the harness's own
 * `obsidian_test` AVD runs at a different geometry than the
 * `obsidian_screenshots` AVD sized to the store's frame. Picking by position
 * silently photographs the wrong screen at the wrong size, and the dimension
 * assertion that would have caught it fires several minutes later, after the
 * run.
 *
 * Pure and unit-tested; the `adb` round-trips that gather the AVD names live in
 * `resolve-emulator-device-id`.
 */
/**
 * One running emulator, paired with the AVD it was started from.
 */
export interface EmulatorDeviceCandidate {
    /**
     * The AVD name the emulator reports, e.g. `obsidian_screenshots`.
     */
    readonly avdName: string;
    /**
     * The device UDID, e.g. `emulator-5554`.
     */
    readonly deviceId: string;
}
/**
 * Parameters for {@link selectEmulatorDeviceId}.
 */
export interface SelectEmulatorDeviceIdParams {
    /**
     * The AVD name to match.
     */
    readonly avdName: string;
    /**
     * Every running emulator, with the AVD each was started from.
     */
    readonly candidates: readonly EmulatorDeviceCandidate[];
}
/**
 * Picks the emulator started from a named AVD.
 *
 * @param params - The AVD to match and the running emulators to match against.
 * @returns The matching device UDID, or `null` when no running emulator carries that AVD name.
 */
export declare function selectEmulatorDeviceId(params: SelectEmulatorDeviceIdParams): null | string;