/// <reference types="node" />
export declare function parseEnvNumber<T extends number, TDefault extends T | undefined>(prop: string, defaultValue?: TDefault, env?: NodeJS.ProcessEnv): T | TDefault;
export declare function parseEnvJSON<T, TDefault extends T | undefined>(prop: string, defaultValue?: TDefault, env?: NodeJS.ProcessEnv): T | TDefault;
export declare function parseEnvBoolean<T extends boolean>(prop: string, defaultValue?: T, env?: NodeJS.ProcessEnv): T;
type EnumOrArrayOfLiterals<T extends string> = ArrayLike<T> | {
    readonly [s: string]: T;
};
export declare function parseEnvEnum<T extends string, TDefault extends T | undefined>(prop: string, validValues: EnumOrArrayOfLiterals<T>, defaultValue?: TDefault, env?: NodeJS.ProcessEnv): T | TDefault;
export {};