如何让GatsbyJS中的/__refresh webhook刷新page-data.json？

exports.onCreateNode = ({ node, actions }) => {
  const { createNode } = actions;

  if (node.internal.type === 'HttpBridge') {
    // 注册/__refresh webhook
    if (node.method === 'POST' && node.path === '/__refresh') {
      createNode({
        id: 'webhook-refresh',
        parent: null,
        children: [],
        internal: {
          type: 'WebhookRefresh',
          contentDigest: 'refresh',
        },
      });
    }
  }
};

exports.onCreatePage = async ({ page, actions }) => {
  const { createPage } = actions;

  if (page.path === '/__refresh') {
    // 标记该页面需要刷新
    page.context.refresh = true;
    createPage(page);
  }
};

exports.onPostBuild = async ({ graphql, actions }) => {
  const { createPage } = actions;

  const refreshPage = await graphql(`
    query {
      allWebhookRefresh {
        nodes {
          id
        }
      }
    }
  `);

  if (refreshPage && refreshPage.data && refreshPage.data.allWebhookRefresh) {
    const nodes = refreshPage.data.allWebhookRefresh.nodes;

    if (nodes && nodes.length > 0) {
      // 生成刷新操作的新页面
      createPage({
        path: '/__refresh',
        component: require.resolve('./src/templates/refresh.js'),
        context: {},
      });
    }
  }
};