gatsby#Page TypeScript Examples

The following examples show how to use gatsby#Page. You can vote up the ones you like or vote down the ones you don't like, and go to the original project or source file by following the links above each example. You may check out the related API usage on the sidebar.
Example #1
Source File: onCreatePage.ts    From gatsby-plugin-react-i18next with MIT License 4 votes vote down vote up 
onCreatePage = async (
  {page, actions}: CreatePageArgs<PageContext>,
  pluginOptions: PluginOptions
) => {
  //Exit if the page has already been processed.
  if (typeof page.context.i18n === 'object') {
    return;
  }

  const {createPage, deletePage} = actions;
  const {
    defaultLanguage = 'en',
    generateDefaultLanguagePage = false,
    languages = ['en'],
    pages = []
  } = pluginOptions;

  type GeneratePageParams = {
    language: string;
    path?: string;
    originalPath?: string;
    routed?: boolean;
    pageOptions?: PageOptions;
  };
  const generatePage = async ({
    language,
    path = page.path,
    originalPath = page.path,
    routed = false,
    pageOptions
  }: GeneratePageParams): Promise<Page<PageContext>> => {
    return {
      ...page,
      path,
      context: {
        ...page.context,
        language,
        i18n: {
          language,
          languages: pageOptions?.languages || languages,
          defaultLanguage,
          generateDefaultLanguagePage,
          routed,
          originalPath,
          path
        }
      }
    };
  };

  const pageOptions = pages.find((opt) => match(opt.matchPath)(page.path));

  let newPage;
  let alternativeLanguages = generateDefaultLanguagePage
    ? languages
    : languages.filter((lng) => lng !== defaultLanguage);

  if (pageOptions?.excludeLanguages) {
    alternativeLanguages = alternativeLanguages.filter(
      (lng) => !pageOptions?.excludeLanguages?.includes(lng)
    );
  }

  if (pageOptions?.languages) {
    alternativeLanguages = generateDefaultLanguagePage
      ? pageOptions.languages
      : pageOptions.languages.filter((lng) => lng !== defaultLanguage);
  }

  if (pageOptions?.getLanguageFromPath) {
    const result = match<{lang: string}>(pageOptions.matchPath)(page.path);
    if (!result) return;
    const language = languages.find((lng) => lng === result.params.lang) || defaultLanguage;
    const originalPath = page.path.replace(`/${language}`, '');
    const routed = Boolean(result.params.lang);
    newPage = await generatePage({language, originalPath, routed, pageOptions});
    if (routed || !pageOptions.excludeLanguages) {
      alternativeLanguages = [];
    }
  } else {
    newPage = await generatePage({language: defaultLanguage, pageOptions});
  }

  try {
    deletePage(page);
  } catch {}
  createPage(newPage);

  await BP.map(alternativeLanguages, async (lng) => {
    const localePage = await generatePage({
      language: lng,
      path: `${lng}${page.path}`,
      routed: true
    });
    const regexp = new RegExp('/404/?$');
    if (regexp.test(localePage.path)) {
      localePage.matchPath = `/${lng}/*`;
    }
    if (localePage.matchPath !== undefined) {
      localePage.matchPath = `/${lng}${localePage.matchPath}`;
    }
    createPage(localePage);
  });
}