🐛 Migrating from a .prettierrc.yaml doesn't work

[illright]

Environment information

CLI:
  Version:                      1.7.3
  Color support:                true

Platform:
  CPU Architecture:             aarch64
  OS:                           macos

Environment:
  BIOME_LOG_DIR:                unset
  NO_COLOR:                     unset
  TERM:                         "xterm-256color"
  JS_RUNTIME_VERSION:           "v21.5.0"
  JS_RUNTIME_NAME:              "node"
  NODE_PACKAGE_MANAGER:         "pnpm/8.15.8"

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

Workspace:
  Open Documents:               0

What happened?

mkdir biome-repro
cd biome-repro
echo "trailingComma: all" > .prettierrc.yaml
pnpm init
pnpm add -D prettier
pnpm add --save-dev --save-exact @biomejs/biome
pnpm biome init
pnpm biome migrate prettier --write

Result:

migrate ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

  ✖ Migration has encountered an error: Biome couldn't find a Prettier configuration file.

However, if I do this:

echo '{ "trailingComma": "all" }' > .prettierrc
pnpm biome migrate prettier --write

It works:

.prettierrc has been successfully migrated.

Expected result

It should recognize the YAML file of Prettier RC as a valid configuration

Code of Conduct

• I agree to follow Biome's Code of Conduct

[ematipico]

It doesn't work because Biome can't parse yaml files. This is out of scope.

[Conaclos]

Biome is currently unable to handle YAML files. This is documented in our documentation. If Biome gets a YAML parser in the future, then we could support YAML migration for Prettier and ESLint.