gatsby-node.js

const redirects = require('./redirects')

exports.createPages = ({actions: {createRedirect}}) => {
  for (const [fromPath, toPath] of Object.entries(redirects)) {
    // console.warn(`[redirect] ${fromPath} → ${toPath}`)
    createRedirect({fromPath, toPath, redirectInBrowser: true})
  }
}

exports.onCreateWebpackConfig = ({stage, loaders, actions}) => {
  if (stage === 'build-html' || stage === 'develop-html') {
    actions.setWebpackConfig({
      module: {
        rules: [
          {
            // Ignore "@github\/markdown-toolbar-element" module during server-side rendering
            // because it uses DOM APIs that aren't available on the server.
            // Copied from https://www.gatsbyjs.com/docs/debugging-html-builds/#fixing-third-party-modules
            test: /@github\/markdown-toolbar-element/,
            use: loaders.null(),
          },
        ],
      },
    })
  }
}