export declare function getEnvVar(key: string, defaultValue?: string): string | undefined;
export declare function getRequiredEnvVar(key: string, defaultValue?: string): string;
export declare function getEnvVarAsBoolean(key: string, defaultValue?: boolean): boolean;
export declare function getEnvVarAsNumber(key: string, defaultValue?: number): number | undefined;
export interface EnvConfig {
    [key: string]: {
        key: string;
        defaultValue?: string | number | boolean;
        type?: 'string' | 'number' | 'boolean';
        required?: boolean;
    };
}
export declare function getEnvConfig<T extends EnvConfig>(config: T): {
    [K in keyof T]: T[K]['type'] extends 'number' ? number : T[K]['type'] extends 'boolean' ? boolean : string;
};