/**
 * It takes a string and returns an object.
 * If given null or undefined an empty object is returned.
 * If given anything else, a TypeError is thrown.
 * An `Error` will also be thrown if the provided string doesn't contain valid environment variables.
 * E.g. if given the string `1a=b`, an error will be thrown because environment variables cannot have a digit as the first character.
 */
declare function parseEnvString(str: string | null | undefined): { [key: string]: string };

/**
 * Parse a string containing environment variables to a key/value object.
 */
export = parseEnvString;