Use govuk-frontend v5 #1753
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Use govuk-frontend v5 #1753
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patrickpatrickpatrick
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Blocked by alphagov/govuk_publishing_components#3700 |
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govuk_publishing_components has govuk-frontend as a dependency. 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. As well as installing terser and updating the config, this commit also contains a patch for getting terser working. Sprockets doesn't have an built-in loader for terser so we need to add this functionality.
To prevent browsers evaluating JS that isn't supported, components that contain code from govuk-frontend have been moved to a separate file `es6-components.js` which is included in `application.html.erb` as a script tag with `type="module"`.
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Trello
What
es6-components.jsfileWhy
govuk_publishing_components uses v5 of govuk-frontend. There are several breaking changes in this release and so we need to update the applications that use govuk_publishing_components. Please read what has changed in govuk_publishing_components and govuk-frontend. This specific changes this PR addresses are:
es6-components.jsfilegovuk-frontendloads a page with JS on it, attempting to parse the JS fromgovuk-frontendwill cause an error. To avoid this from happening, JS that containsgovuk-frontendJS has been moved to seperate file which will be loaded in a script tag withtype="module". This will prevent the JS from being parsed and so prevent the errorFollow these steps if you are doing a Rails upgrade.