export interface Spec<T> {
    /**
     * An Array that lists the admissable parsed values for the env var.
     */
    choices?: ReadonlyArray<T>;
    /**
     * A fallback value, which will be used if the env var wasn't specified. Providing a default effectively makes the env var optional.
     */
    default?: T;
    /**
     * A fallback value to use only when NODE_ENV is not 'production'.
     * This is handy for env vars that are required for production environments, but optional for development and testing.
     */
    devDefault?: T;
    /**
     * A string that describes the env var.
     */
    desc?: string;
    /**
     * An example value for the env var.
     */
    example?: string;
    /**
     * A url that leads to more detailed documentation about the env var.
     */
    docs?: string;
}
export interface ValidatorSpec<T> extends Spec<T> {
    _parse: (input: string) => T;
}
export interface CleanedEnvAccessors {
    /** true if NODE_ENV === 'development' */
    readonly isDevelopment: boolean;
    readonly isDev: boolean;
    /** true if NODE_ENV === 'test' */
    readonly isTest: boolean;
    /** true if NODE_ENV === 'production' */
    readonly isProduction: boolean;
    readonly isProd: boolean;
}
export interface ReporterOptions<T> {
    errors: Partial<Record<keyof T, Error>>;
    env: unknown;
}
export interface CleanOptions<T> {
    /**
     * Pass in a function to override the default error handling and console output.
     * See ./reporter.ts for the default implementation.
     */
    reporter?: ((opts: ReporterOptions<T>) => void) | null;
}