/**
 * useComponentDefaults — reads theme.components[name].defaultProps and merges
 * them with instance props so that instance-provided values always win.
 *
 * This hook is called as the first statement inside every component function:
 * ```tsx
 * const Button = (rawProps: ButtonProps) => {
 *   const props = useComponentDefaults('Button', rawProps);
 *   // ... rest of component uses `props`
 * };
 * ```
 *
 * Merge semantics:
 *  1. Start from `defaultProps` (from theme.components[name]).
 *  2. For each key in `instanceProps`, overwrite the default **only when the
 *     value is not `undefined`**. This preserves the defaultProp for a prop
 *     that was never passed (not passed ≠ passed as `undefined`).
 *
 * Zero-allocations fast path:
 *  - When `theme.components` is absent, or has no entry for `name`, the
 *    original `instanceProps` reference is returned unchanged.
 *  - When `defaultProps` is present but all instance props are defined,
 *    a new object is returned (unavoidable; still O(n) in prop count).
 */
import type { ComponentPropsMap } from '../theme/componentsDefs';
/**
 * Merges theme-level `defaultProps` for `name` with `instanceProps`.
 * Instance props take precedence: a defined instance value is never overridden.
 */
export declare function useComponentDefaults<K extends keyof ComponentPropsMap>(name: K, instanceProps: ComponentPropsMap[K]): ComponentPropsMap[K];
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