/** Maximum message body length in characters. */
export declare const MAX_BODY_CHARS = 16384;
/** The character-count threshold above which the live counter chip
 *  appears. Show once `len` crosses 90 % of the cap. */
export declare function shouldShowCounter(len: number, max: number): boolean;
/** Cmd/Ctrl + Enter sends. Plain Enter inserts a newline (textarea
 *  default). Returns true when the keydown event matches the
 *  send-shortcut shape.
 *  M7: IME guard — isComposing=true or keyCode=229 (IME processing)
 *  suppresses the shortcut so CJK users don't accidentally send
 *  mid-composition. */
export declare function isCmdEnter(ev: KeyboardEvent): boolean;
/** Auto-grow target height (px) for a textarea, capped at maxPx.
 *  Snap to scrollHeight, never exceed the cap. */
export declare function autogrowHeightPx(scrollHeight: number, maxPx: number): number;
//# sourceMappingURL=textfield-helpers.d.ts.map