export declare const SNAPSHOT_KEYS: unique symbol;
export interface Snapshottable {
    /** Per-compound declared observable surface. */
    [SNAPSHOT_KEYS]?: readonly string[];
    /**
     * Optional override that takes precedence over `SNAPSHOT_KEYS`. Use
     * when the snapshot shape is computed (e.g. async-shaped compounds
     * that want to project a stable `{ status, items }` payload regardless
     * of internal accessor names).
     */
    snapshot?: () => Record<string, unknown>;
}
/**
 * Read the declared state surface of a compound API object as a plain
 * object. Reads are untracked — calling `snapshot(c)` does NOT subscribe
 * the caller to future state changes; it returns a frozen-in-time view.
 *
 * If neither `snapshot()` nor `SNAPSHOT_KEYS` is declared, returns `{}`.
 * The library does not auto-iterate own properties (see file header).
 */
export declare function snapshot<C extends object>(c: C): Record<string, unknown>;
/**
 * Convenience for declaring `SNAPSHOT_KEYS` with type-safe key names.
 * Returns the key tuple; use as
 *
 *   return { ...api, [SNAPSHOT_KEYS]: snapshotKeys<MyApi>('open', 'disabled') };
 *
 * Compile-time check that every passed key exists on the API type.
 */
export declare function snapshotKeys<C>(...keys: ReadonlyArray<keyof C & string>): readonly string[];
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