gatsby-node.js

const Promise = require("bluebird")
const path = require("path")

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

  return new Promise((resolve, reject) => {
    const pageTemplate = path.resolve("./src/templates/page.js")
    resolve(
      graphql(
        `
          {
            allContentfulPage {
              edges {
                node {
                  title
                  slug
                }
              }
            }
          }
        `
      ).then(result => {
        if (result.errors) {
          console.log(result.errors)
          reject(result.errors)
        }

        const pages = result.data.allContentfulPage.edges
        pages.forEach((page, index) => {
          createPage({
            path: `${page.node.slug}/`,
            component: pageTemplate,
            context: {
              slug: page.node.slug,
            },
          })
        })

        // Redirects

        createRedirect({
          fromPath: "/",
          toPath: "/en-CA/",
          isPermanent: true,
          redirectInBrowser: true,
        })
      })
    )
  })
}