gatsby-pages.js

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

 const blogPost = path.resolve(`./src/templates/blog-post.js`)
 const defaultPage = path.resolve(`./src/templates/page.js`)
 const blogPage = path.resolve(`./src/templates/blog-list.js`)
 const tabPage = path.resolve(`./src/templates/tag.js`)
 const categoryPage = path.resolve(`./src/templates/category.js`)

 const result = await graphql(
   `
     {
       pagesGroup: allMdx(
         sort: { fields: [frontmatter___date], order: DESC }
         limit: 1000
         filter: { frontmatter: { published: { ne: false } } }
       ) {
         edges {
           node {
             fields {
               slug
             }
             fileAbsolutePath
             frontmatter {
               title
             }
           }
         }
       }
       tagsGroup: allMdx(limit: 2000) {
         group(field: frontmatter___taxonomy___tag) {
           fieldValue
         }
       }
       categoriesGroup: allMdx(limit: 2000) {
         group(field: frontmatter___taxonomy___category) {
           fieldValue
         }
       }
     }
   `
 )

...