/**
 * Reading optional configuration from the environment.
 *
 * .env.example ships placeholder values (your_email@example.com, …). Someone
 * who copies it without editing those lines should get the unset behavior,
 * not requests that claim to come from a placeholder contact.
 */
/**
 * True for values that are empty or still a placeholder: anything with a
 * "your_"/"your-" token or an example.com/.org/.net address (reserved by
 * RFC 2606, so never a real contact).
 */
export declare function isPlaceholder(value: string): boolean;
/** The trimmed value of an environment variable, or undefined when it is unset or a placeholder. */
export declare function configuredEnv(name: string, env?: NodeJS.ProcessEnv): string | undefined;
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