Welcome 👋

Pull the latest changes and switch to branch day2:

git pull
git switch day2

001-landing

• To launch locally: yarn && yarn start
• To run a tunnel to the web: yarn build && yarn serve-to-web
• To deploy to (your) Netlify (via Netlify CLI): yarn build && netlify deploy -d dist --prod

002-spa

• To launch locally: yarn && yarn start
• To run a tunnel to the web: yarn build && yarn serve-to-web
• To deploy to (your) Netlify (via Netlify CLI): yarn build && netlify deploy -d build --prod

How to measure your local changes in...

WebPageTest

1. Build the app for production (if you try to optimize a dev build, you’ll be chasing wrong stuff): yarn build

2. Expose the app to the web:

   • Run a tunnel: yarn serve-to-web
   • Or deploy to Netlify (via Netlify CLI): netlify deploy -d dist --prod

3. Go to WebPageTest.org

4. Open Advanced Configuration → Advanced (yes, another one) and set the “User Agent String” field to custom-user-agent (or anything else non-standard). This is needed to bypass the localtunnel’s “Click this button to continue” page.

   You can skip this step if you deployed the app to Netlify.

5. If you try to test the 002-spa app, the app will require you to sign in to GitHub. To skip this step, hard-code your GitHub token in the app:

   • Once you’ve signed into the app locally, run localStorage.getItem('github_token')

   • Copy the resulting value

   • Go to the AuthWrapper.js component and replace this line:

     const storedToken = localStorage.getItem("github_token");

     with this:

     const storedToken = "<THE VALUE YOU COPIED>";

   • (Don’t forget to re-build after this.)

PageSpeed Insights

1. Build the app for production (if you try to optimize a dev build, you’ll be chasing wrong stuff): yarn build
2. Expose the app to the web:
   • Or deploy to Netlify (via Netlify CLI): netlify deploy -d dist --prod
   • (The localtunnel tunnel won’t work because it shows a “Click this button to continue” page. You can try a paid ngrok instead.)
3. Go to PageSpeed Insights and run the test there

Lighthouse

1. Build the app for production (if you try to optimize a dev build, you’ll be chasing wrong stuff): yarn build
2. Serve the app locally: yarn serve
3. Open the url in Chrome
4. Go to Chrome DevTools → Lighthouse and run a test

Performance Insights

1. Build the app for production (if you try to optimize a dev build, you’ll be chasing wrong stuff): yarn build
2. Serve the app locally: yarn serve
3. Open the url in Chrome
4. Go to Chrome DevTools → three-dot menu → More Tools → Performance Insights and run a test