/**
 * Configure a base state w/ an extension.
 *
 * @param {State} base
 *   Base state to configure.
 * @param {Options} extension
 *   Extension to apply.
 * @returns {State}
 *   Given `base`.
 */
export function configure(base: State, extension: Options): State;
import type { State } from './types.js';
import type { Options } from './types.js';
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