/**
 * Speech bubble module.
 *
 * Manages the cartoon speech bubble displayed above the pet. Only one bubble
 * is visible at a time; new bubbles immediately replace existing ones.
 */
/**
 * Truncates text to `maxLen` characters, appending "..." when truncated.
 */
export declare function truncateText(text: string, maxLen?: number): string;
/**
 * Immediately hides the speech bubble.
 */
export declare function hideBubble(): void;
/**
 * Shows a speech bubble with the given text for the specified duration.
 *
 * A new bubble replaces any currently-visible bubble. The bubble fades in
 * over 200 ms and fades out after `durationMs`.
 *
 * @param text       Text to display (will be truncated to 60 chars).
 * @param durationMs How long to keep the bubble visible (default 3000 ms).
 */
export declare function showBubble(text: string, durationMs?: number): void;
/**
 * Shows an AI-generated speech bubble. These last 8 seconds, longer than
 * regular event bubbles.
 */
export declare function showAiBubble(text: string): void;
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