gatsby-node.js

/**
 * Implement Gatsby's Node APIs in this file.
 *
 * See: https://www.gatsbyjs.org/docs/node-apis/
 */

const path = require(`path`)
exports.createPages = async ({ actions, graphql }) => {
  const { createPage } = actions
  const result = await graphql(`
    {
      allMarkdownRemark {
        edges {
          node {
            frontmatter {
              title
              path
              slug
            }
          }
        }
      }
    }
  `)
  if (result.errors) {
    console.error(result.errors)
  }
  result.data.allMarkdownRemark.edges.forEach(({ node }) => {
    if (node.frontmatter.path != null) {
      console.log(node.frontmatter)
      createPage({
        path: node.frontmatter.path,
        component: path.resolve(`src/templates/post.js`),
        context: { slug: node.frontmatter.slug },
      })
    }
  })
}