gatsby-source-shopify-storefront

// In your gatsby-config.js
  plugins: [
    {
      resolve: 'gatsby-source-shopify-storefront',
      options: {
        // Your Shopify instance name (e.g. 'shopify-store-name', 
        // if your shopify shop is located at https://shopify-store-name.myshopify.com/)
        siteName: 'shopify-store-name',
        // Your Shopify Storefront API access token 
        // generated in the private apps section of your store admin.
        // Refer to Shopify's Storefront API Documentation for more information
        // https://help.shopify.com/api/storefront-api/getting-started
        accessToken: 'STOREFRONT_ACCESS_TOKEN',
      },
    },
  ]

  allShopifyProducts {
    edges {
      node {
        id
        title
        description
        descriptionHtml
        variants {
          edges {
            node {
              id
              title
              price
              selectedOptions {
                name
                value
              }
            }
          }
        }
        images {
          edges {
            node {
              id
              src
            }
          }
        }
      }
    }
  }

const _ = require(`lodash`)
const Promise = require(`bluebird`)
const path = require(`path`)
const slash = require(`slash`)

exports.createPages = ({ graphql, boundActionCreators }) => {
  const { createPage } = boundActionCreators
  return new Promise((resolve, reject) => {
    // The “graphql” function allows us to run arbitrary
    // queries against the local Shopify graphql schema. Think of
    // it like the site has a built-in database constructed
    // from the fetched data that you can run queries against.

    // ==== PAGES (SHOPIFY PRODUCTS) ====
    graphql(
    `
      {
        allShopifyProducts {
          edges {
            node {
              id
            }
          }
        }
      }
    `
    )
      .then(result => {
        if (result.errors) {
          console.log(result.errors)
          reject(result.errors)
        }

        // Create product pages.
        const pageTemplate = path.resolve('./src/templates/page.js')
        // We want to create a detailed page for each
        // lever node. We'll just use the ID for the slug.
        _.each(result.data.allShopifyProducts.edges, edge => {
          // Gatsby uses Redux to manage its internal state.
          // Plugins and sites can use functions like "createPage"
          // to interact with Gatsby.
          createPage({
            // Each page is required to have a `path` as well
            // as a template component. The `context` is
            // optional but is often necessary so the template
            // can query data specific to each page.
            path: `/${edge.node.id}/`,
            component: slash(pageTemplate),
            context: {
              id: edge.node.id,
            },
          })
        })
      })
      // ==== END PAGES ====

      // resolve() must be called at the end so Gatsby knows that we're done adding pages.
      .then(resolve())
  })
}