Description

Currently, all form themes are located into symfony/twig-bridge. This has some major drawbacks:

• Download all themes when you only want to use one
• No autoconfiguration from Flex
• Impossible to create theme specific FormType
  • Bootstrap 5 inline radio/checkbox and switches need a class hack to work while with a SwitchType things are easier
• Testing is complicated

Example

I propose to extract all form themes except form_div_layout.html.twig and form_table_layout.html.twig into the symfony/ux repository or a dedicated one (symfony/form-theme, symfony/ui ?) and split each themes into individual packages

• symfony/ux-theme-bootstrap
• symfony/ux-theme-tailwind
• symfony/ux-theme-foundation
• etc ...

Here is an exaustive list of benefits that this could bring:

• Require only the desire form theme (composer req symfony/ux-theme-bootstrap)
• Recipes from Flex (autoconfiguring twig.form_themes or webpack.config.js, update packages.json etc ...)
• Custom FormType (SwitchType for Bootstrap)
• Simplify maintenance (split tests which are a mess, see [RFC] Simplify form theme testing for external packages #49775)
• New form themes from the community