legacy-javascript audit in Lighthouse to assess the benefits of switching to modern JavaScript syntax.
Calculate the size and performance improvement a site could achieve by switching to modern JavaScript syntax.
Submitting a URL for analysis is stateless. The service does not store any information about you or the URLs you analyze. A minimal Google Analytics ping is used to record page visits (URL and referrer) and JavaScript errors, as well as the total calculated size difference number (but not the URL you entered).
# clone it
git clone git@github.com:GoogleChromeLabs/estimator.dev.git
cd estimator.dev
# install dependencies and firebase CLI
npm install
npm install -g firebase-tools
# build the front-end:
npm run build
# start the server and functions
firebase emulators:start