text: const path = require(`path`); // highlight-line
  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; // highlight-line
    const result = await graphql(`
      query {
        allMarkdownRemark {
          edges {
            node {
              fields {
                slug
              }
            }
          }
        }
      }
    `);
  
    // highlight-start
    result.data.allMarkdownRemark.edges.forEach(({ node }) => {
      createPage({
        path: node.fields.slug,
        component: path.resolve(`./src/templates/blog-post.jsx`),
        context: {
          // Data passed to context is available
          // in page queries as GraphQL variables.
          slug: node.fields.slug,
        },
      });
    });
    // highlight-end
  };
  