>>> [!note] Migrated issue <!-- Drupal.org comment --> <!-- Migrated from issue #3562289. --> Reported by: [balintbrews](https://www.drupal.org/user/613760) Related to !401 >>> <h3>Overview</h3> <p>The JavaScript compiler used by both the in-browser code editor and the CLI tool can only handle JavaScript syntax.</p> <h3>Proposed resolution</h3> <p>Add support for TypeScript syntax using <a href="https://swc.rs/docs/configuration/compilation#typescript">SWC's TypeScript parser option</a>. Note that this will not mean actual type checking, it will simply enable parsing the syntax, which feels like a good first step. Type-checking can be added to codebases managed with the CLI tool.</p>