/**
 * Consumer-supplied override for a step.
 *
 * - `completed` — the step holds a value; render the tick and let the user
 *   back in to change it.
 * - `error` — the step's own validation failed; always wins.
 * - `unlocked` (1.11.0) — the step has been *reached* but holds no value of
 *   its own. It renders exactly like an upcoming step, but the user may open
 *   it. Added for flows whose final step can never report itself "completed"
 *   because its validity belongs to a form inside it: without this, moving
 *   the cursor backwards left that step HTML-`disabled` and unreachable.
 *
 * `'completed'` and `'error'` behave exactly as before, so consumers passing
 * either (or nothing) are unaffected. A consumer that reads this union back
 * in an exhaustive `switch` needs a case for `'unlocked'`; `StepState` — the
 * union such a switch usually runs on — is deliberately untouched.
 */
export type StepStatus = 'completed' | 'error' | 'unlocked';
export type StepState = 'upcoming' | 'current' | 'completed' | 'error';
export interface StepSpec {
    /** Visible step label — comes from the consumer, already translated. */
    label: string;
    /** Optional secondary line (kept short; shown in accordion + progress captions). */
    description?: string;
    /**
     * Consumer-explicit status override. `error` always wins; `completed` is
     * honoured only for steps at or beyond the active index so the active step
     * always keeps `current` (otherwise a consumer pre-setting `completed` on
     * every step would silently mask the current position). `unlocked` changes
     * reachability only — see `stepIsReachable` — and never the rendered state.
     */
    status?: StepStatus;
}
export declare function stateForStep(index: number, activeStep: number, status?: StepStatus): StepState;
/**
 * May the user open this step?
 *
 * Everything at or before the cursor is reachable, as is any step the
 * consumer has explicitly marked `completed`, `error` or `unlocked`.
 * Steps ahead of the cursor with no status stay locked, exactly as before.
 */
export declare function stepIsReachable(index: number, activeStep: number, status?: StepStatus): boolean;
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