Work around optional parameters without void

Author: jablko

lib/index.js

@@ -52,7 +52,11 @@ cliCompleter.pluginId = constants.sourceId
  * Plugin to validate that Markdown links and images reference existing local
  * files and headings.
  *
- * @type {import('unified').Plugin<[Options?, FileSet?]|[Options?]|void[], Root>}
+ * @typedef {import('unified-lint-rule').Label|import('unified-lint-rule').Severity} Severity
+ * @type {import('unified').Plugin<[(Options|[Severity, Options?])?, FileSet?], Root>}
+ * https://github.com/microsoft/TypeScript/pull/48132
+ * @param [rawOptions]
+ * @param [fileSet]
  */
 export default function remarkValidateLinks(rawOptions, fileSet) {
   // Attach a `completer`.
@@ -86,7 +90,7 @@ export default function remarkValidateLinks(rawOptions, fileSet) {
         }
       )
     }
-  ).call(this, rawOptions)
+  ).call(this, /** @type {NonNullable<rawOptions>} */ (rawOptions))
 }
 
 /**