/**
 * The design-system class each form control wears. The 36 px geometry, the
 * boundary, the placeholder, and the hover/disabled/invalid states all live in
 * `components.css` under these names — this module is the single place a
 * control names the class, so no control re-derives that geometry inline.
 */
export declare const INPUT_CLASS = "tai-input";
export declare const TEXTAREA_CLASS = "tai-textarea";
export declare const SELECT_TRIGGER_CLASS = "tai-select-trigger";
/** A control's class plus the caller's, which sorts last so it can override. */
export declare function controlClassName(base: string, className: string | undefined): string;
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