underscore _splitIntoSections to avoid being included in client side code

src/node/plugins/localSearchPlugin.ts

@@ -132,7 +132,7 @@ export async function localSearchPlugin(
     const html = await render(file)
     const sections =
       // user provided generator
-      (await options.miniSearch?.splitIntoSections?.(file, html)) ??
+      (await options.miniSearch?._splitIntoSections?.(file, html)) ??
       // default implementation
       splitPageIntoSections(html)
     // add sections to the locale index

types/default-theme.d.ts

@@ -436,7 +436,7 @@ export namespace DefaultTheme {
        * @param {string} path - absolute path to the markdown source file
        * @param {string} html - document page rendered as html
        */
-      splitIntoSections?: (
+      _splitIntoSections?: (
         path: string,
         html: string
       ) =>