fix: check if page was already translated

This prevent loops between two onCreatePage implementations.

src/onCreatePage/translatePage.test.ts

@@ -238,4 +238,20 @@ describe('translatePage', () => {
       },
     });
   });
+
+  it('should skip already translated pages', () => {
+    const page: Page = {
+      path: '/imprint',
+      component: {} as any,
+      context: {
+        locale: 'de-CH',
+        localePagesId: 'imprint',
+      },
+    };
+
+    translatePage({ page, actions } as any, options);
+
+    expect(actions.deletePage).not.toBeCalled();
+    expect(actions.createPage).not.toBeCalled();
+  });
 });

src/onCreatePage/translatePage.ts

@@ -6,6 +6,11 @@ import { generatePageContextByPath, translatePagePath, translatePagePaths } from
 export const translatePage = async ({ page, actions }: CreatePageArgs<SitePageContext>, options: PluginOptions) => {
   const { createPage, deletePage } = actions;
 
+  // If this page was already translated, we skip it.
+  if (page.context?.locale && page.context.localePagesId) {
+    return;
+  }
+
   // Translate statefully created pages from `/src/pages` or gatsby-plugin-page-creator
   if (options && page.isCreatedByStatefulCreatePages) {
     const paths = translatePagePaths(page.path, options);