import type { ZodType, ZodTypeDef } from 'zod';
interface MetaEnv {
    [key: string]: unknown;
}
export type Variable<T> = {
    name: string;
    key: string;
    asEnv: (value: T) => Record<string, string>;
    get: (env: MetaEnv) => T | null;
    getOrDefault: (env: MetaEnv, def: T) => T;
    zod: ZodVariable<T>;
};
export type ZodTypeProvider<T> = (zod: typeof import('zod')) => ZodType<T | undefined, ZodTypeDef, T | undefined>;
export type ZodVariable<T> = {
    type: ZodTypeProvider<T>;
};
export type Converter<T> = {
    convert: (target: unknown) => T | null;
    asString: (value: T) => string;
    type: ZodTypeProvider<T>;
};
export declare function createVariable<T>(key: string, converter: Converter<T>): Variable<T>;
export {};