/**
 * String utility.
 */
export default class StringUtility {
    /**
     * ASCII lowercase.
     *
     * @see https://infra.spec.whatwg.org/#ascii-lowercase
     * @param text Text.
     * @returns Lowercase text.
     */
    static asciiLowerCase(text: string): string;
    /**
     * ASCII uppercase.
     *
     * @see https://infra.spec.whatwg.org/#ascii-uppercase
     * @param text Text.
     * @returns Uppercase text.
     */
    static asciiUpperCase(text: string): string;
}
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