/**
 * Build a directive-shaped ref callback that spreads a slot prop bag onto
 * an element exactly once on mount. Used by every compound primitive's
 * `c.triggerRef()` / `c.panelRef()` factories.
 *
 * RFC 07 apply-phase is unowned, so a slot-spreading directive can't create
 * signals at apply time. The captured `getProps` is invoked exactly once
 * inside an owned render-effect, then `spread()` writes the (still-reactive,
 * thanks to getter-bag semantics) attributes onto the node. Subsequent ref
 * callbacks on the same logical slot are no-ops — single binding per slot.
 *
 * Returned callback semantics:
 * - First non-null `el` value latches and runs `spread`. Subsequent values
 *   (mount → unmount → remount) do NOT re-bind; the original spread keeps
 *   its reactive subscriptions alive against the original node.
 *
 * If a slot needs to support remounting, use `c.<slot>(userProps)` from the
 * compound's own JSX instead — the slot factory builds a fresh getter-bag
 * per call and the wrapper's reactive scope handles the lifecycle.
 */
export declare function makeSlotRefDirective<E extends HTMLElement>(getProps: () => object): (el: E | null) => void;
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