import { JSONObject, JSONValue } from '@lumino/coreutils';
import { PreferenceProvider } from './preference-provider';
import { PreferenceProviderImpl } from './preference-provider-impl';
import { PreferenceScope } from './preference-scope';
/**
 * In-memory preference provider used for process-lifetime overrides such as those
 * supplied via the `--session-preference` CLI option. Values live in memory only
 * and are dropped when the process exits.
 */
export declare class SessionPreferenceProvider extends PreferenceProviderImpl implements PreferenceProvider {
    protected readonly preferences: Map<string, JSONValue>;
    protected init(): void;
    canHandleScope(scope: PreferenceScope): boolean;
    getPreferences(): JSONObject;
    setPreference(key: string, value: JSONValue | undefined): Promise<boolean>;
}
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