LSP-ember for Sublime Text

A developer created LSP-ember, a Language Server Protocol bridge that brings autocompletion, go-to-definition, and hover support to Ember's .gjs and .gts template-tag files in Sublime Text. The package mediates between Sublime Text and Glint's @glint/ember-tsc and @glint/tsserver-plugin, which handle the underlying TypeScript integration. The developer also split the Template Tag syntax package into separate Glimmer JS and Glimmer TS definitions, one per file extension, and is seeking community testing and modern code snippets.

In modern and legacy Ember projects 3.28 or above , we can use <template tags—files with the extension .gjs or .gts —to write components, routes, and tests with fewer Emberisms. For each new file type, however, we need to instruct IDEs how to deliver a good developer experience. In May 2025, I had published Template Tag https://github.com/ijlee2/sublime-syntax-definition-template-tag , which provides syntax highlighting in Sublime Text. Reading code became easy, but writing remained hard: As soon as a .{js,ts} file turned .{gjs,gts} , tools like autocompletion , go-to-definition , and hover became inaccessible. These tools are possible thanks to LSP Language Server Protocol https://microsoft.github.io/language-server-protocol . Last week, I created LSP-ember https://github.com/ijlee2/LSP-ember to bridge the gap. The implementation scaffolded with Claude Code is rather straightforward, because Glint @glint/ember-tsc https://github.com/typed-ember/glint/tree/main/packages/ember-tsc and @glint/tsserver-plugin https://github.com/typed-ember/glint/tree/main/packages/tsserver-plugin takes care of the hard parts e.g. talking to TypeScript . LSP-ember is simply a mediator between Sublime Text and Glint. Thanks to the feedback from @rchl and @jwortmann https://github.com/sublimehq/package control channel/pull/9559 , syntax highlighting is now done more correctly. Instead of 1 syntax definition Template Tag supporting .gjs and .gts , there are now 2 Glimmer JS and Glimmer TS —one for each type. You can install the package Template Tag to get both definitions. Before: src/Template Tag.sublime-syntax name: Template Tag scope: source.template-tag extends: - Packages/JavaScript/TypeScript.sublime-syntax file extensions: - gjs - gts contexts: ... misuses ts-type-parameter-list After: src/Glimmer JS.sublime-syntax name: Glimmer JS scope: source.gjs extends: - Packages/JavaScript/JavaScript.sublime-syntax file extensions: - gjs contexts: ... uses class-body-contents After: src/Glimmer TS.sublime-syntax name: Glimmer TS scope: source.gts extends: - Packages/JavaScript/TypeScript.sublime-syntax file extensions: - gts contexts: ... uses class-body-contents Note, the separation allowed Glimmer JS and Glimmer TS to extend JavaScript and TypeScript, respectively. That is, the code matches how we think about .gjs and .gts : They are just .js and .ts with one or more <template tags. I still ran into trial and error, because I didn't know what files are needed for an LSP, how Sublime puts packages together, and how the two Glint packages work to see if they need to be configured in LSP-ember . I wasn't also sure what's the best way to test an LSP locally; symlinks happened to work. ln -s "$HOME/<path/to/my/repo /LSP-ember" "$HOME/Library/Application Support/Sublime Text/Packages/LSP-ember" I hope to gain a better understanding over time. LSP-ember helps Sublime Text be on par with VS Code and a couple of other IDEs https://guides.emberjs.com/release/code-editors . Moreover, the package Template Tag now provides 2 syntax definitions—one for .gjs and another for .gts . The separation will help us maintain code. Since LSP-ember depends on the versions of TypeScript and Glint, I need your help with testing and reporting issues. You can also contribute by providing modern code snippets. The ones that exist for Sublime Text show patterns from Ember 0.x-2.x. The repo snippets https://github.com/ember-tooling/snippets may be a good place to start. For instructions on installing LSP-ember, please check the README https://github.com/ijlee2/LSP-ember installation .