import type { SingleOrArray } from '../types/array-like';
/** Normalizes a SingleOrArray value as an array */
export declare const normalizeAsArray: <T>(value: SingleOrArray<T>) => T[];
/** Normalizes a SingleOrArray value as an array or undefined */
export declare const normalizeAsOptionalArray: <T>(value?: SingleOrArray<T>) => T[] | undefined;
/**
 * Returns an array by efficiently concatenating two potential arrays as needed.  If either array is unset / empty, the other array is
 * returned without copying.  If both arrays are unset / empty, a new empty array is returned.
 */
export declare const concatArrays: <T>(a?: Array<T>, b?: Array<T>) => T[];
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