import type { BooleanField, BooleanFieldInput, EnumField, EnumFieldInput, NumberField, NumberFieldInput, StringField, StringFieldInput } from './schema.js';
/**
 * Return a valid env field to use in this Astro config for `env.schema`.
 */
export declare const envField: {
    string: (options: StringFieldInput) => StringField;
    number: (options: NumberFieldInput) => NumberField;
    boolean: (options: BooleanFieldInput) => BooleanField;
    enum: <T extends string>(options: EnumFieldInput<T>) => EnumField;
};