oxfmt with zed malforming files when there are unsaved changes

[osdiab]

Problem

I added a line of code, and then format the file; it's applying formatting badly, which ends up malforming my code. See this video:

https://www.loom.com/share/10fe8ae1db2e4c14aa8cc1ab792ec885

This does not happen when I run oxfmt from the command line, nor in Cursor. Just in Zed.

Zed config:

{
  "lsp": {
    "tsgo": {
      "settings": {
        "package_version": "7.0.0-dev.20260423.1"
      }
    },
    "oxlint": {
      "initialization_options": {
        "settings": {
          "configPath": "./oxlint.config.ts",
          "disableNestedConfig": false,
          "fixKind": "safe_fix",
          "run": "onType",
          "unusedDisableDirectives": "deny"
        }
      }
    },
    "oxfmt": {
      "initialization_options": {
        "settings": {
          "fmt.configPath": "./oxfmtrc.json",
          "run": "onSave"
        }
      }
    }
  },
  "format_on_save": "on",
  "prettier": {
    "allowed": false
  },
  "formatter": [{ "language_server": { "name": "oxfmt" } }],
  "languages": {
    "TypeScript": {
      "language_servers": ["tsgo", "oxlint", "oxfmt"],
      "format_on_save": "on",
      "prettier": {
        "allowed": false
      },
      "formatter": [
        {
          "language_server": {
            "name": "oxfmt"
          }
        }
      ]
    },
  },
}

[nchartiot]

I have the same issue, and my theory is that zed is defaulting to their built-in prettier formatter instead of oxfmt (case in point, if you run prettier on the terminal, it'll format in that same "broken" way).

I've tried disabling prettier in settings, but it doesn't seem to respect that toggle. It might be more of a zed problem than a oxc-extension problem tho, so maybe an issue on the main repo could get better results

[nrayburn-tech]

Could either of you share the output of the Oxfmt RPC Messages logs while reproducing this (open the logs, reproduce the problem, make sure the logs are all expanded because the seem to get truncated by the editor, copy the logs and share them)? (They will contain source code and other things, so make sure to review it before sharing it.) Screenshot below shows how to view them.