🐛 allowComments default setting error in json parser

[JinuYong]

Environment information

biome rage
CLI:
  Version:                      1.9.4
  Color support:                true

Platform:
  CPU Architecture:             aarch64
  OS:                           macos

Environment:
  BIOME_LOG_PATH:               unset
  BIOME_LOG_PREFIX_NAME:        unset
  BIOME_CONFIG_PATH:            unset
  NO_COLOR:                     unset
  TERM:                         "xterm-256color"
  JS_RUNTIME_VERSION:           "v22.13.1"
  JS_RUNTIME_NAME:              "node"
  NODE_PACKAGE_MANAGER:         unset

Biome Configuration:
  Status:                       Loaded successfully
  Formatter disabled:           false
  Linter disabled:              false
  Organize imports disabled:    false
  VCS disabled:                 true

Workspace:
  Open Documents:               0

What happened?

1. install biome in new vite project
2. run 'biome init'
3. tsconfig.app.json file is treated as json, not jsonc

4. add 'allowComments' setting in biome.json, the error disappear in tsconfig.app.json

5. even if i removed all the values in biome.json, it still cause same error

6. if i delete biome.json or set allowComments option to true in biome.json, error is solved

Expected result

The default value of the allowComments option is true, so I think the tsconfig.app.json file should be automatically treated as a jsonc file

Code of Conduct

• I agree to follow Biome's Code of Conduct

[ematipico]

The reason why VSCode doesn't show you errors for the TypeScript configuration, is because it treats JSON files as JSONC files.

However, we prefer to stick with the standard. Regardless, in V2, files named tsconfig.*.json will be automatically treated as JSONC files by Biome

[Jinu0827]

The reason why VSCode doesn't show you errors for the TypeScript configuration, is because it treats JSON files as JSONC files.

However, we prefer to stick with the standard. Regardless, in V2, files named tsconfig.*.json will be automatically treated as JSONC files by Biome

Hi, Thanks for the explanation

So, am I to understand that it is normal behavior to get a comment error in the tsconfig.*.json file if the allowComments option is not written in the biome.json file, not in V2.0?

[ematipico]

Yes that's normal. By standards, JSON doesn't allow comments

[Jinu0827]

I understand, Thanks! 👍