Guides & Tutorials
Enable Gatsby Incremental Builds on Netlify
Gatsby recently released incremental builds, an improvement that reduces the amount of work required to build a Gatsby site. In this post, we’ll learn how to enable Gatsby incremental builds on Netlify.
Step 1: Upgrade to Gatsby v2.20.4 or higher
Gatsby introduced incremental builds in version 2.20.4, so make sure to upgrade your Gatsby site to the latest version.
# this will upgrade to the latest version of Gatsby
npm install gatsby@latest
Step 2: Install cross-env
Most Windows command prompts will choke when you set environment variables as part of your build command. Cross-env will let us not worry about what environment we are using.
npm install cross-env
Step 3: Add the Gatsby Cache Netlify Build Plugin
Incremental builds rely on Gatsby’s cache, so we need to enable
netlify-plugin-gatsby-cache, which will persist Gatsby’s
.cache directories between builds.
Step 4: Add the flag to enable Gatsby incremental builds
Finally, update your build command in
package.json (or wherever you’ve set your build command) to include the incremental builds flag:
"develop": "gatsby develop",
- "build": "gatsby build"
+ "build": "cross-env GATSBY_EXPERIMENTAL_PAGE_BUILD_ON_DATA_CHANGES=true gatsby build --log-pages"
We’re adding the optional
--log-pages flag here so we can see what Gatsby builds on each run — feel free to leave that out if you don’t want to see the extra logs.
Step 5: Make a change in your CMS and see the incremental builds!
Once we’ve made the above changes, our Gatsby site will run with incremental builds enabled! This means that changes from a supported CMS — Gatsby supports Contentful, Sanity, DatoCMS and CosmicJS at the time of writing with WordPress and Drupal support in alpha — Gatsby will only rebuild the parts of the site affected by the changed data.
If we look at our build logs, the first build will show a full build with all of our pages:
2:00:43 PM: info Done building in 41.429647017 sec
2:00:43 PM: info Built pages:
2:00:43 PM: Updated page: /design-research-program
2:00:43 PM: Updated page: /offline-plugin-app-shell-fallback/
2:00:43 PM: Updated page: /
2:00:43 PM: Updated page: /404/
2:00:43 PM: Updated page: /404.html
On repeat builds, we can see that the Gatsby build is much faster and only rebuilds the page that was changed:
2:03:56 PM: info Done building in 17.691847403 sec
2:03:56 PM: info Built pages:
2:03:56 PM: Updated page: /design-research-program
You can use Gatsby incremental builds today!
If you’ve got a Gatsby site, you can enable incremental builds today!
Give it a try, and enjoy builds that make your blazing fast Gatsby site even more blazinger! 🔥