import type { Maybe } from "@thi.ng/api";
/**
 * Specialized / optimized version of
 * [`thi.ng/defmulti`](https://thi.ng/defmulti) for vector operations. Uses
 * simplified logic to dispatch on length (vector size) of `dispatch` argument.
 *
 * @param dispatch - arg index (default: 1)
 */
export declare const vop: <T extends Function>(dispatch?: number, fallback?: T, ...optimized: Maybe<T>[]) => {
    (...args: any[]): any;
    add(dim: number, fn: T): T;
    default(fn: T): T;
    impl(dim?: number): Maybe<T>;
};
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