import { ContextKey, ContextReader } from '@webpieces/core-util';
/**
 * MutableContextStore - the BROWSER ContextReader.
 *
 * Browsers have no AsyncLocalStorage, so apps (Angular/React) hold one of these
 * (e.g. as an Angular service / React context value) and set values as they become
 * known (login token, selected tenant, ...). The ContextMgr then reads from it on
 * every outbound request.
 *
 * Example (Angular):
 * ```typescript
 * const store = new MutableContextStore();
 * // startup:
 * HeaderRegistry.configure(AppHeaders.getAllHeaders(), CompanyHeaders.getAllHeaders(), true);
 * const factory = new ClientHttpFactory(new ContextMgr(store));
 * const client = factory.createClient(SaveApi, new ClientConfig(baseUrl));
 *
 * // later, when the user logs in / picks a tenant:
 * store.set(WebpiecesCoreHeaders.AUTHORIZATION, token);
 * store.set(CompanyHeaders.TENANT_ID, tenantId);
 * ```
 */
export declare class MutableContextStore implements ContextReader {
    private values;
    /** Set (or overwrite) the current value for a context key. */
    set(key: ContextKey, value: string): void;
    /** Remove the current value for a context key (e.g. on logout). */
    remove(key: ContextKey): void;
    /** Clear all stored values. */
    clear(): void;
    read(key: ContextKey): string | undefined;
}