/**
 * Source channel schema — single source of truth.
 *
 * Closed enum: extension requires a code change (PR).
 * Matches the sources-pipeline SourceChannel type.
 */
export declare const SOURCE_CHANNELS: readonly ["meeting", "email", "slack", "linear", "notion"];
export type SourceChannel = (typeof SOURCE_CHANNELS)[number];
export declare class InvalidSourceChannelError extends Error {
    readonly name = "InvalidSourceChannelError";
    constructor(value: unknown);
}
export declare function isSourceChannel(value: unknown): value is SourceChannel;
export declare function assertSourceChannel(value: unknown): asserts value is SourceChannel;
/**
 * Map a source channel (singular enum value) to the S3 path segment used by
 * sources-pipeline writers. The sources-pipeline (hq-pro) uses plural for
 * meetings only; the other channels pass through:
 *
 *   meeting → meetings
 *   email   → email
 *   slack   → slack
 *   linear  → linear
 *   notion  → notion
 *
 * Keep in sync with hq-pro/src/sources/s3-paths.ts:sourcePathSegment().
 */
export declare function sourcePathSegment(channel: SourceChannel): string;
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