/**
 * Slack bridge configuration. Reads tokens + policy from env (mirroring the
 * omp env-config pattern), with optional overrides for tests/flags.
 *
 * Tokens (both required):
 * - SLACK_BOT_TOKEN  (xoxb-…)  — bot user OAuth token
 * - SLACK_APP_TOKEN  (xapp-…)  — app-level token with `connections:write` (Socket Mode)
 *
 * Policy (required):
 * - SLACK_ALLOWED_USERS  csv of user IDs; `*` = explicit allow everyone opt-in
 * - SLACK_REQUIRE_MENTION  "true"/"false" (default true) — require @mention in channels
 * - COPILOT_TMUX_SESSION  passthrough to comms session resolution
 */
export interface SlackConfig {
    botToken: string;
    appToken: string;
    /** Non-empty; ["*"] means explicit allow all. */
    allowedUsers: string[];
    /** require an @mention to respond in channels (DMs always respond). */
    requireMention: boolean;
    /** explicit Copilot tmux session name, if set. */
    sessionEnv?: string;
}
export interface SlackConfigOverrides {
    botToken?: string;
    appToken?: string;
}
export declare const SLACK_ALLOWED_USERS_REQUIRED_MESSAGE = "SLACK_ALLOWED_USERS is required. Set it to a comma-separated Slack user ID allowlist, or set SLACK_ALLOWED_USERS=* to explicitly allow all Slack users.";
export declare function ensureSlackAllowedUsersConfigured(allowedUsers: readonly string[]): void;
export declare function isSlackAllowAll(allowedUsers: readonly string[]): boolean;
/**
 * Load + validate Slack config. Throws a clear error if a token is missing.
 * `env` defaults to process.env; tests can pass a custom map.
 */
export declare function loadSlackConfig(overrides?: SlackConfigOverrides, env?: NodeJS.ProcessEnv): SlackConfig;