export declare type ValueValidator<T> = {
    /**
     * Default value to set if env variable is not set
     */
    default?: T;
    /**
     * Error message to return if no env variable or default is set
     */
    errorMessage?: string;
    /**
     * Terminates the application if no env variable or default is set via `process.exit(1)`.
     * Only applicable for NodeJS.
     */
    critical?: boolean;
    converter?: (value: string) => T;
};
export declare type ObjectValidator<T> = {
    [P in keyof T]: ValueValidator<T[P]>;
};
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