Stylelint——Unexpected unknown pseudo-class selector ":deep"

    "stylelint": "^16.8.1",
    "stylelint-config-standard": "^36.0.1",
    "stylelint-less": "^3.0.1",
    "stylelint-order": "^6.0.4",

module.exports = {
  defaultSeverity: 'error',
  extends: ['stylelint-config-standard'],
  plugins: ['stylelint-less'],
  overrides: [
    {
      files: ['**/*.html', '**/*.vue'],
      customSyntax: 'postcss-html',
    },
    {
      files: ['**/*.less'],
      customSyntax: 'postcss-less',
    },
  ],
  rules: {
    'selector-pseudo-class-no-unknown': [
      true,
      {
        ignorePseudoClasses: ['deep'],
      },
    ],
  },
};