Learning Lighthouse CI from scratch (quickstart)

Just one of the things I'm learning. https://github.com/hchiam/learning

Have Lighthouse CI tool run with Travis for every commit or PR to a web app project hosted on GitHub.

Results upon commit

Automated test run info here: https://travis-ci.org/hchiam/learning-lighthouse-ci/builds (or click on the badge above). Update: Since June 15th, 2021, building on travis-ci.org "ceased", so you should use travis-ci.com from now on. Some of the old .org links have stopped working, so here's the .com builds page: https://app.travis-ci.com/github/hchiam/learning-lighthouse-ci/builds Also, you may want to use free GitHub Actions instead.

Example PR here (click "View details"): https://github.com/hchiam/learning-lighthouse-ci/pull/1#issuecomment-555602268

Setup steps (if you git clone this repo)

1. To test the web app locally:

   npm install
   npm start
   

   and in a separate CLI tab:

   npm run build
   npm install -g @lhci/[email protected]
   lhci autorun
   

2. To test the web app upon commit/PR:

   • You might want to edit .travis.yml
   • You might want to edit lighthouserc.json
   • Then make your commit.

Setup steps (if you're starting from an empty folder)

1. For lhci autorun to work, you need a web app set up that has things like a dist or public folder, etc. To do that, you can run a one-liner command to set up a React app:

   # cd to desktop or containing folder
   create-react-app my-app
   

2. To make sure it's working locally:

   cd my-app
   npm start
   

   and in another CLI tab:

   cd my-app
   npm install -g @lhci/[email protected]
   lhci autorun
   

3. The key is setting up the Travis file .travis.yml:

   language: node_js
   node_js:
     - 10
   before_install:
     - npm install -g @lhci/[email protected]
   script:
     - npm run build
     - lhci autorun
   addons:
     chrome: stable
   

Aside

If you want to see a report with more details (e.g. vulnerable libraries -> which specific ones), use a different CLI tool: run lighthouse locally:

npm install -g lighthouse
lighthouse https://airhorner.com/
# lighthouse <url>

Then open the generated html file.