/**
 * Versioned Slack source-thread key encoding.
 *
 * Format: `slack:v1:<base64url(JSON array)>` where the array is:
 * `[installationKind, installationId, contextTeamId, conversationId, mode, groupingId]`
 *
 * Opaque provider IDs are never parsed with delimiter assumptions.
 */
export type SourceThreadMode = "thread" | "conversation" | "message";
export type InstallationKind = "team" | "enterprise";
export interface SlackSourceThreadParts {
    installationKind: InstallationKind;
    installationId: string;
    contextTeamId: string;
    conversationId: string;
    mode: SourceThreadMode;
    groupingId: string;
}
/**
 * Encode a Slack source thread key. Array order is the canonical serialization;
 * both runtimes share byte-level fixtures over this shape.
 */
export declare function encodeSlackSourceThreadKey(parts: SlackSourceThreadParts): string;
/** Decode a `slack:v1:` source thread key, or return `undefined` if malformed. */
export declare function decodeSlackSourceThreadKey(key: string): SlackSourceThreadParts | undefined;
/**
 * Resolve the MDA grouping id for a Slack conversation mapping mode.
 *
 * - `"thread"`: parent `thread_ts`, or the message's own `ts` for a new thread
 * - `"conversation"`: constant `root` (conversation id is a separate segment)
 * - `"message"`: message `ts`
 */
export declare function slackGroupingId(mode: SourceThreadMode, messageTs: string, threadTs?: string): string;
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