/**
 * Validation helper functions for configuration objects
 */
export declare const isValidStringOrRegExp: (value: string | RegExp | undefined, defaultValue: string | RegExp) => string | RegExp;
export declare const isValidString: <T extends string>(value: string | undefined | T, defaultValue: string) => string;
export declare const isValidNumber: (value: number | undefined, defaultValue: number) => number;
export declare const isValidBoolean: (value: boolean | undefined, defaultValue: boolean) => boolean;
export declare const isValidArray: (value: any[] | undefined, defaultValue: any[]) => any[];
export declare const isValidEnum: <T>(value: any | T, defaultValue: T, enumValues: T[]) => T;
export declare const isValidFunction: (value: any, defaultValue: any) => any;
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