Preventing files from being cleared on save with biome check using --stdin-file-path

[stewarthsoj]

I'm currently using the biome check command to format code and organize imports, but when there is nothing to fix the output is empty. The problem with this is when I want to run this command on save with editors like Zed the contents of the file is cleared.

As an example, here is how I set up biome check to run on save in Zed:

{
  "language_overrides": {
    "TSX": {
      "format_on_save": {
        "external": {
          "command": "bunx",
          "arguments": [
            "biome",
            "check",
            "--apply-unsafe",
            "--stdin-file-path={buffer_path}"
          ]
        }
      }
    }
  }
}

Here is an example TSX file:

import { a, b } from 'dep';

export default function Component() {
  return <pre>Testing</pre>;
}

If I save this file in Zed in the current state, the file is cleared. But, if I remove, say, the semi-colon, or change the order of the imports (i.e. b is first), the file is formatted correctly and the imports are organized.

In summary, I'm keen to know if there is a workaround for this i.e. a way to abort piping empty inputs to stdout or always passing the file contents.

My Biome Config

{
  "$schema": "https://biomejs.dev/schemas/1.2.2/schema.json"
}

References

• https://docs.zed.dev/languages/javascript
• https://discord.com/channels/1132231889290285117/1155222438007812249/1162555949068861550

[ematipico]

That's probably a bug 🐛

There's no current workaround, so opening a PR and fixing the issue is the best course of action.

And I think the fix is to return the original output regardless of the outcome of the command.

[ematipico]

Resolved in #543. The next release will have this fix

[stewarthsoj]

Amazing!