import type { Plugin } from "unified";
import type { Program } from "estree";
export type TestFunction = (componentName: string) => boolean | undefined | null;
/**
 * It is a recma plugin which transforms the esAST / esTree.
 *
 * This recma plugin sets the default value `() => null` for the Components in case them missing or not provided.
 * in order "eval of the MDX compiled source" NOT to throw an error.
 *
 * The "recma-mdx-escape-missing-components" basically:
 *
 * inserts the Empty Component definition into code
 *
 * const _EmptyComponent = () => null;
 *
 * looks for a declaration statement in an object pattern initiated by the `_components`
 *
 * const { Component1, Component2 } = _components;
 *
 * converts it as the destructed properties (Components) having a default value
 *
 * const { Component1 = _EmptyComponent, Component2 = _EmptyComponent } = _components;
 *
 * [test]
 * if "undefined", all components pass the check
 * if "string", check if the component name matches with the string
 * if "string[]", check if the component name is included in the string array
 * if "TestFunction", check if the test function returns true.
 *
 * if check is true meaningly passed, set the default value `() => null` for that component
 *
 */
declare const plugin: Plugin<[TestFunction?], Program>;
export default plugin;
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