/**
 * @public
 * Replaces length 0 strings with `undefined`.
 * @returns `input` if it's a `string` of length greater than 0, otherwise `undefined`.
 *
 * @remarks
 * See {@link stringNormalizeEmptyToUndefined}.
 */
export declare function stringNormalizeEmptyToUndefined(input: string | null | undefined): string | undefined;
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