gatsby-node.js

const { createFilePath } = require(`gatsby-source-filesystem`)
const path = require('path')

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: node.frontmatter.path,
    })
    createNodeField({
      node,
      name: 'strava_id',
      value: node.frontmatter.strava_id,
    })
    createNodeField({
      node,
      name: 'cover_image',
      value: node.frontmatter.cover_image,
    })
  }
}

exports.createPages = ({ graphql, actions }) => {
  const { createPage } = actions
  return new Promise((resolve, reject) => {
    graphql(`
      {
        allMarkdownRemark(filter: { frontmatter: { publish: { eq: true } } }) {
          edges {
            node {
              frontmatter {
                type
              }
              fields {
                slug
              }
            }
          }
        }
      }
    `).then(result => {
      result.data.allMarkdownRemark.edges.forEach(({ node }) => {
        // console.log(node.frontmatter.type)
        if (node.frontmatter.type == 'blog') {
          createPage({
            path: node.fields.slug,
            component: path.resolve('./src/templates/blog.js'),
            context: {
              slug: node.fields.slug,
            },
          })
        } else if (node.frontmatter.type == 'ride') {
          createPage({
            path: node.fields.slug,
            component: path.resolve('./src/templates/ride.js'),
            context: {
              slug: node.fields.slug,
            },
          })
        }
      })
      resolve()
    })
  })
}

exports.onCreateWebpackConfig = ({ actions, stage }) => {
  if (stage === 'build-html') {
    actions.setWebpackConfig({
      module: {
        rules: [
          {
            test: /mapbox-gl/,
            use: ['null-loader'],
          },
        ],
      },
    })
  }
}