Description
Summary
I saw support for these formats were added a while ago via #9940
But trying to test it, it does not work as expected.
I've tried both with and without config, with a separately provided tree sitter grammar, various different combinations of configurations and I can never get highlights and completions to work for handlebars and javascript/typescript in the same file. I've gone through several permutations of everything I can think of, but no dice sadly.
I've tried with the latest release and also building from main - the same result with both. Generally speaking, js/ts will highlight and complete, but glimmer syntax does not. I'm able to get glimmer working with a standalone configuration, but this does not work in .gjs or .gts files. (I've bodged it and fed the file format to a glimmer configuration and I can get glimmer working, but not js)
Reproduction Steps
I tried this:
hx <some .gjs/.gts file>
I expected this to happen: Full syntax highlighting, actions completions etc
Instead, this happened: js only highlighting and completion, but nothing for the glimmer/handlebars in the file
Helix log
The log returns this:
~/.cache/helix/helix.log
2025-07-04T17:26:59.315 helix_term::application [WARN] Ignoring a client/registerCapability request because dynamic capability registration is not enabled. Please report this upstream to the language server
Platform
macOS
Terminal Emulator
Ghostty
Installation Method
source/brew
Helix Version
main/latest