/**
 * A capability the editor offers its features but implements somewhere lower
 * down: the app's router owns navigation, the header owns the create-page
 * modal. The provider holds the slot, so a feature calls the capability
 * without knowing which component carries it out.
 *
 * `call` and `register` keep their identity for the provider's lifetime, so a
 * caller can hold either in a dependency array. Calling an unfilled slot does
 * nothing.
 */
export interface EditorCapability<A extends unknown[]> {
    call: (...args: A) => void;
    /** Fills the slot until the returned function runs. */
    register: (implementation: (...args: A) => void) => () => void;
}
export declare function useEditorCapability<A extends unknown[]>(): EditorCapability<A>;