valienv/dist/validators.d.ts

A simple environment variables validator for Node.js, web browsers and React Native

export type Validator<T> = (value: string | undefined) => T | undefined;
export type OptionalEnvValue<T> = {
    defined: true;
    value: T;
} | {
    defined: false;
};
export declare const boolean: Validator<boolean>;
export declare const email: Validator<string>;
export declare const number: Validator<number>;
export declare const port: Validator<number>;
export declare const string: Validator<string>;
export declare const url: Validator<string>;
export declare const oneOf: <T extends string>(...values: Readonly<T[]>) => Validator<T>;
export declare const optional: <T>(validator: Validator<T>) => Validator<OptionalEnvValue<T>>;