import type { SharedImpl } from './shared-impl';
export declare const STATE_KEY: unique symbol;
export interface GlobalSlot {
    [STATE_KEY]?: SharedImpl;
}
/** Returns the shared impl, creating it if it doesn't exist yet. Only called by `init`. */
export declare function getOrCreateSharedImpl(): SharedImpl;
/** Returns the shared impl if it already exists, or `undefined`. */
export declare function getSharedImpl(): SharedImpl | undefined;
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