export declare function compareStringInvariant(x: string | undefined, y: string | undefined): number;
export declare function compareStringInvariantIgnoreCase(x: string | undefined, y: string | undefined): number;
export interface StringComparisonOptions {
    /**
     * The locale used to compare the strings.
     * By default it uses the result of {@link getInvariantLocale}.
     */
    locale?: Intl.Locale | string | string[];
    ignoreCase?: boolean;
    /**
     * Indicates that the string comparison must ignore nonspacing combining characters, such as diacritics.
     * The Unicode Standard defines combining characters as characters that are combined with base characters to produce a new character.
     * Nonspacing combining characters do not occupy a spacing position by themselves when rendered.
     *
     * @see https://learn.microsoft.com/en-us/dotnet/api/system.globalization.compareoptions
     */
    ignoreNonSpace?: boolean;
}
export declare function compareString(x: string | undefined, y: string | undefined, collator?: Intl.Collator): number;
export declare function compareString(x: string | undefined, y: string | undefined, collator?: StringComparisonOptions): number;
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