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alphagov / government-frontend

Serves government pages on GOV.UK
https://docs.publishing.service.gov.uk/apps/government-frontend.html
MIT License
50 stars 17 forks source link

Use Terser instead of Uglifier #3167

Closed MartinJJones closed 2 months ago

MartinJJones commented 3 months ago

What

Use Terser instead of Uglifier to compile JavaScript.

Why

This change is preparation for upgrading to V5 of govuk-frontend in the govuk-publishing-components gem.

govuk-frontend v5 now targets browsers that support ES6. This means that the UMD modules used in govuk_publsihing_components from govuk-frontend use features of ES6 and so it means that Uglifier can't be used anymore because it only supports ES5.

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Further info

JS Size

minifier file minified JS minified JS (gzip)
uglifer government-frontend/application.js 122KB 22.7KB
terser government-frontend/application.js 122KB 22.8KB

Browser testing

I've tested the changes on Integration using the browsers below, functionality works as expected without any console errors.