export declare function uniqueFilter<T extends string>(value: T, index: number, self: readonly T[]): boolean;
export declare const isNotUndefined: <T>(item: T | undefined) => item is T;
export declare function getFileNameWithoutExtension(filePath: string): string;
export declare function sortAlphabetically<T>(arrayToSort: readonly T[], propertySelector: (item: T) => string): readonly T[];
export declare function getStringOrUndefinedAsPropertyValue(text: string | undefined): string;
export declare function toSafePropertyValue(value: string): string;
export declare function toOutputDirPath(outputDir: string | undefined): string;
export declare function singleItemToArray<T>(item: T | undefined): readonly T[];
export declare function findRequired<T>(array: readonly T[], predicate: (item: T, index: number) => boolean, errorMessage: string): T;
export declare function findRequired<T>(array: readonly T[], predicate: (item: T, index: number) => boolean, errorMessage: () => never): T;