🐛 Cannot format unsaved files

[diminutivesloop]

VS Code version

1.105.1

Extension version

3.2.0

Biome version

2.2.6

Operating system

• Windows
• macOS
• Linux

Description

Unsaved files are not formatted even with Biome installed globally and even though Biome shows up as an available formatter. This is a regression on #460.

Steps to reproduce

1. Open VSCode
2. Create a new 'Untitled' tab
3. Add some JSON content. For example:

{
"hello": "word",
"foo": 1, "bar": 2
}

4. In the command palette, go to "Format document with..." and select Biome.

Expected behavior

Formatting should work for unsaved files

Does this issue occur when using the CLI directly?

Not sure / Not applicable

Link to a minimal reproduction

N/A (no files needed, see steps above)

Logs