/**
 * Shared constants used across the codebase.
 */
/** Message types that represent user-authored text content. */
export declare const TEXT_MESSAGE_TYPES: readonly ["RichText/Html", "Text"];
export type TextMessageType = (typeof TEXT_MESSAGE_TYPES)[number];
/** Check whether a message type represents user-authored text content. */
export declare function isTextMessageType(messageType: string): messageType is TextMessageType;
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