/** whitelist.ts — Pure whitelist authoriser for Telegram sender ids. No side effects, no network. */
/** Immutable set of allowed numeric Telegram user ids. */
export type AllowedUsers = ReadonlySet<number>;
/**
 * Parses TELEGRAM_ALLOWED_USERS from the given env map.
 * Expects a comma-separated list of positive integer Telegram user ids.
 * Empty or missing env var returns an empty set.
 * Whitespace around ids is trimmed; non-numeric tokens are silently ignored.
 */
export declare function parseAllowedUsers(env: Record<string, string | undefined>): AllowedUsers;
/**
 * Returns true if the numeric sender id is present in the allowed set.
 */
export declare function isAllowed(id: number, allowed: AllowedUsers): boolean;
/**
 * Returns a denial message that echoes the sender's exact numeric id as a substring (sc-1-4).
 * The id appears verbatim inside the message so the sender knows which account was rejected.
 */
export declare function denialReply(id: number): string;
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