.stylelintrc.yaml

$schema: https://raw.githubusercontent.com/SchemaStore/schemastore/master/src/schemas/json/stylelintrc.json

extends:
  - stylelint-config-recommended
  - stylelint-config-standard
  - stylelint-prettier/recommended

plugins:
  - stylelint-csstree-validator

rules:
  import-notation: null
  # TODO: fix all of these rules violated in stylelint-config-recommended
  no-descending-specificity: null
  # this fixer is incompatible with the copyright headers
  comment-whitespace-inside: null
  # these fixers assume use of `autoprefixer`: we _don't_ use any CSS preprocessors
  property-no-vendor-prefix: null
  selector-no-vendor-prefix: null
  value-no-vendor-prefix: null
  # these fixers doesn't work well with variables
  alpha-value-notation: null
  color-function-notation: null
  # TODO: evaluate these unfixable rules violated in stylelint-config-standard
  custom-property-pattern: null
  declaration-block-no-redundant-longhand-properties: null
  function-linear-gradient-no-nonstandard-direction: null
  function-url-quotes: null
  keyframes-name-pattern: null
  number-max-precision: null
  selector-class-pattern: null
  selector-id-pattern: null
  selector-pseudo-class-no-unknown: null
  selector-pseudo-element-no-unknown: null
  selector-not-notation: null
  # disallow use of more than one bare HTML tag like `div span` to avoid performance regression,
  # while allowing compounded HTML tags like `button.jp-Button`
  selector-max-type:
    - 1
    - ignore: "compounded"
  # matching complex selectors is expensive
  selector-max-class: 4
  # TODO: decrease max-compound to 3
  selector-max-compound-selectors: 4
  # TODO: decrease to 0
  selector-max-universal: 1
  csstree/validator: true