import type { LabDefinition } from "../../labs/registry.js";
import type { UserLabState, UserLabStateResult } from "../../labs/store.js";
export type LabValues = Record<string, boolean>;
export type LabStates = Record<string, UserLabStateResult>;
export declare function isLabStateEnabled(labs: LabStates, key: string): boolean;
/**
 * A lab by key, or by its definition. Pass the definition so the lab reads as
 * its `defaultEnabled` until the server answers (and when it can't); a bare
 * key can't know that default.
 */
export type LabReference = string | Pick<LabDefinition, "key" | "defaultEnabled">;
export declare function useLabState(lab: LabReference): {
    enabled: boolean;
    source: UserLabState["source"] | null;
    mixed: boolean;
    legacyValues?: Record<string, boolean>;
    isLoading: boolean;
    isError: boolean;
    isSuccess: boolean;
    isStateError: boolean;
    /** Read the Lab state again, such as after it failed to load. */
    refetch: () => void;
};
/**
 * Whether a lab is on. Until the server answers, a definition reads as its
 * `defaultEnabled`; a bare key reads as on, so UI behind a lab that may be
 * enabled doesn't disappear while loading.
 */
export declare function useLab(lab: LabReference): boolean;
export declare function useLabs(): LabValues;
export declare function useLabStates(): LabStates;