gatsby-node.js

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

    const projectTemplate = require.resolve(`./src/templates/projectTemplate.js`)

    const result = await graphql(`
      {
        allMarkdownRemark(
          sort: { order: DESC, fields: [frontmatter___date] }
          limit: 1000
        ) {
          edges {
            node {
              frontmatter {
                slug
              }
            }
          }
        }
      }
    `)

    // Handle errors
    if (result.errors) {
        reporter.panicOnBuild(`Error while running GraphQL query.`)
        return
    }

    result.data.allMarkdownRemark.edges.forEach(({ node }) => {
        createPage({
            path: node.frontmatter.slug,
            component: projectTemplate,
            context: {
                // additional data can be passed via context
                slug: node.frontmatter.slug,
            },
        })
    })
}