/**
 * Checks whether a string is a valid number with one of the allowed unit suffixes.
 *
 * @param value - The string to validate (e.g., "10px", "1.5em")
 * @param units - The allowed unit suffixes (e.g., `["px", "em", "rem"]`)
 * @param numberType - The number format constraint: `"int"`, `"uint"`, or `"float"` (defaults to `"float"`)
 * @returns Whether the value is a valid quantity with an allowed unit
 */
export declare function isQuantity(value: string, units: readonly string[], numberType?: 'int' | 'uint' | 'float'): boolean;