interface EnvRule {
    required?: boolean;
    integer?: boolean;
    minimum?: number;
    default?: string;
    pattern?: RegExp;
}
type EnvSchema = Record<string, EnvRule>;
declare function defineEnvSchema(schema: EnvSchema): EnvSchema;
declare function validateEnv(schema: EnvSchema, env?: Record<string, string | undefined>): Record<string, string>;
export type { EnvRule, EnvSchema };
export { defineEnvSchema, validateEnv };