stylelint for less - The "syntax" option is no longer available

stylelint --fix “src/**/*.less” --syntax less Error: The “syntax” option is no longer available. You should install an appropriate syntax, e.g. postcss-scss, and use the “customSyntax” option

"lint:style": "stylelint --fix \"src/**/*.less\" --syntax less",

How to use customSyntax to fixed it? Thanks

[jeddy3]

See the migration guide.

You should install postcss-less:

npm install --save-dev postcss-less

And then either use the --custom-syntax flag:

"lint:style": "stylelint --fix \"src/**/*.less\" --custom-syntax postcss-less"

or use the customSyntax configuration object property:

{
  "customSyntax": "postcss-less",
  "rules": {
    ..
  }
}

You can also raise an issue in the 3rd party stylelint-config-recommended-less shared config to see if they’ll be willing to bundle the postcss-less syntax in the config.

[meatnordrink]

For anyone that encounters this later, the solution is

npm i --save-dev postcss@8

https://github.com/stylelint-scss/stylelint-config-standard-scss/issues/5#issuecomment-961709882