Zed code completion not working

Correction, I actually did configure the language servers for both Elixir and HEEx file types. Here’s the relevant snippets from my settings.json file:

 "languages": {
    "Elixir": {
      "tab_size": 2,
      "language_servers": [
        "elixir-ls",
        "!next-ls",
        "!lexical",
        "tailwindcss-language-server",
        "emmet-language-server",
        "...",
      ],
    },
    "HEEx": {
      "tab_size": 2,
      "language_servers": [
        "elixir-ls",
        "!next-ls",
        "!lexical",
        "tailwindcss-language-server",
        "emmet-language-server",
        "...",
      ],
    },

I actually published a fix several months back where one can expand Emmet snippets in both .heex templates and within H sigil. It’s working for me as expected using the installed extension, Emmet v0.0.11. Also, I didn’t have to explicitly start any servers.

Ok, then probably you need to do what this article mentions for Emmet - for HTML server. The issue is that the HTML server is not started for .heex.html files, so actions specific for HTML are not run. The key would be to force HTML server to start on HEEX files.

Well, they are. Syntax highlighting works. Elixir language server starts. It does not claim to provide same capabilities as with plain HTML files. Perhaps this is a discussion better suited for some Zed forum or issue tracker.

Mainly Emacs.

Yes I saw this and I thought its outdated. Zed already has a “vscode-html-language-server“ that runs to provide autocompletion to .html files (just like emmet) So I think explicitly installing emmet loses the point. Zed is not able to use its emmet alternative to comprehend heex files even if it claims that heex templates are supported by zed Elixir | Elixir. So, If this is a WIP in zed, then Ill continue with VS code then. Can I ask you which editor you use ?

Thanks for your explanation. So if I understand you correctly for both major lsps - expert and elixir-ls Ill have to wait for heex support. or I keep using VS code where this works correctly somehow. I was just experimenting with zed.

This article describes how to make Emmet server work with HEEx files: Setting up Zed for Elixir development in 2026 💧 - DEV Community and provide HTML completion. I haven’t tried it myself, but looks reasonable.

You need to differenciate between the pieces an extenension enables. They can bring in syntax highlighting through tree-sitter as well as additional language servers. The elixir extension does include heex tree sitter grammer. Autocomplete comes from LSPs. For html files zed runs the built in html lsp. That one wouldn’t understand heex though. For the elixir LSPs available the support for heex is wip at best and imo their maintainers focus is better used improving their support of elixir code before their support of heex.

In the end heex is not html. This is not as simple as “just do what you do for html for this other file”.

Providing more details:

In heex files I dont get autocomplete of HTML tags. For ex. if I type ```<div>``` then the div autoclosing tags should be autogenerated like in .html files in zed.

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In .html files its working as expected.

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Zed claims HEEX support in its elixir support is on by default. Elixir | Elixir

To be honest I’m not sure what you expect here. There is no Elixir code in the screenshot where the code completion could happen. Could you elaborate?

I have just installed Zed with the elixir official extension. It should work by default right in the .heex files ?

Code completion works for me in .ex file but doesn’t in .heex

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If I create a regular .html file in zed, then the HTML autocomplete works as expected.