如何通过编程而不是在配置文件中创建Gatsby路由

const path = require('path');

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

  createPage({
    path: '/blog',
    component: path.resolve('./src/templates/blog.js'),
  });
};

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

  const result = await graphql(`
    query {
      allMarkdownRemark {
        edges {
          node {
            frontmatter {
              slug
            }
          }
        }
      }
    }
  `);

  result.data.allMarkdownRemark.edges.forEach(({ node }) => {
    createPage({
      path: `/blog/${node.frontmatter.slug}`,
      component: path.resolve('./src/templates/blog-post.js'),
      context: {
        slug: node.frontmatter.slug,
      },
    });
  });
};

module.exports = {
  createPages,
};