text: const path = require(`path`)
  const { createFilePath } = require(`gatsby-source-filesystem`)
  
  exports.onCreateNode = ({ node, getNode, actions }) => {
     const { createNodeField } = actions
     if (node.internal.type === `MarkdownRemark`) {
        const slug = createFilePath({ node, getNode, basePath: `pages` })
        createNodeField({
           node,
           name: `slug`,
           value: slug
        })
      }
   }
  
   exports.createPages = async ({ graphql, actions }) => {
     const { createPage } = actions
      const result = await graphql(`
        query {
           allMarkdownRemark {
              edges {
                 node {
                    fields {
                       slug
                    }
                 }
              }
           }
        }
      `)
      result.data.allMarkdownRemark.edges.forEach(({ node }) => {
        createPage({
          path: node.fields.slug,
          component: path.resolve(`./src/templates/blog-post.js`),
          context: {
            // Data passed to context is available
            // in page queries as GraphQL variables.
            slug: node.fields.slug,
          },
        })
      })
   }