interface IEnvironmentVariables {
    /**
     * Get the value of an environment variable.
     * @param key The name of the environment variable
     * @throws If the environment variable is missing
     * @returns The value of the environment variable
     */
    (key: string): string;
    /**
     * Get the value of an environment variable and does not throw if it is missing.
     * @param key The name of the environment variable
     */
    optional(key: string): string | null;
}
declare const env: IEnvironmentVariables;
export default env;
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