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File Content: `resolveDefaultsAtRules.js`

import postcss from 'postcss'
import selectorParser from 'postcss-selector-parser'
import { flagEnabled } from '../featureFlags'

let getNode = {
  id(node) {
    return selectorParser.attribute({
      attribute: 'id',
      operator: '=',
      value: node.value,
      quoteMark: '"',
    })
  },
}

function minimumImpactSelector(nodes) {
  let rest = nodes
    .filter((node) => {
      // Keep non-pseudo nodes
      if (node.type !== 'pseudo') return true

      // Keep pseudo nodes that have subnodes
      // E.g.: `:not()` contains subnodes inside the parentheses
      if (node.nodes.length > 0) return true

      // Keep pseudo `elements`
      // This implicitly means that we ignore pseudo `classes`
      return (
        node.value.startsWith('::') ||
        [':before', ':after', ':first-line', ':first-letter'].includes(node.value)
      )
    })
    .reverse()

  let searchFor = new Set(['tag', 'class', 'id', 'attribute'])

  let splitPointIdx = rest.findIndex((n) => searchFor.has(n.type))
  if (splitPointIdx === -1) return rest.reverse().join('').trim()

  let node = rest[splitPointIdx]
  let bestNode = getNode[node.type] ? getNode[node.type](node) : node

  rest = rest.slice(0, splitPointIdx)

  let combinatorIdx = rest.findIndex((n) => n.type === 'combinator' && n.value === '>')
  if (combinatorIdx !== -1) {
    rest.splice(0, combinatorIdx)
    rest.unshift(selectorParser.universal())
  }

  return [bestNode, ...rest.reverse()].join('').trim()
}

export let elementSelectorParser = selectorParser((selectors) => {
  return selectors.map((s) => {
    let nodes = s.split((n) => n.type === 'combinator' && n.value === ' ').pop()
    return minimumImpactSelector(nodes)
  })
})

let cache = new Map()

function extractElementSelector(selector) {
  if (!cache.has(selector)) {
    cache.set(selector, elementSelectorParser.transformSync(selector))
  }

  return cache.get(selector)
}

export default function resolveDefaultsAtRules({ tailwindConfig }) {
  return (root) => {
    let variableNodeMap = new Map()

    /** @type {Set<import('postcss').AtRule>} */
    let universals = new Set()

    root.walkAtRules('defaults', (rule) => {
      if (rule.nodes && rule.nodes.length > 0) {
        universals.add(rule)
        return
      }

      let variable = rule.params
      if (!variableNodeMap.has(variable)) {
        variableNodeMap.set(variable, new Set())
      }

      variableNodeMap.get(variable).add(rule.parent)

      rule.remove()
    })

    if (flagEnabled(tailwindConfig, 'optimizeUniversalDefaults')) {
      for (let universal of universals) {
        /** @type {Map<string, Set<string>>} */
        let selectorGroups = new Map()

        let rules = variableNodeMap.get(universal.params) ?? []

        for (let rule of rules) {
          for (let selector of extractElementSelector(rule.selector)) {
            // If selector contains a vendor prefix after a pseudo element or class,
            // we consider them separately because merging the declarations into
            // a single rule will cause browsers that do not understand the
            // vendor prefix to throw out the whole rule
            // Additionally if a selector contains `:has` we also consider
            // it separately because FF only recently gained support for it
            let selectorGroupName =
              selector.includes(':-') || selector.includes('::-') || selector.includes(':has')
                ? selector
                : '__DEFAULT__'

            let selectors = selectorGroups.get(selectorGroupName) ?? new Set()
            selectorGroups.set(selectorGroupName, selectors)

            selectors.add(selector)
          }
        }

        if (selectorGroups.size === 0) {
          universal.remove()
          continue
        }

        for (let [, selectors] of selectorGroups) {
          let universalRule = postcss.rule({
            source: universal.source,
          })

          universalRule.selectors = [...selectors]

          universalRule.append(universal.nodes.map((node) => node.clone()))
          universal.before(universalRule)
        }

        universal.remove()
      }
    } else if (universals.size) {
      let universalRule = postcss.rule({
        selectors: ['*', '::before', '::after'],
      })

      for (let universal of universals) {
        universalRule.append(universal.nodes)

        if (!universalRule.parent) {
          universal.before(universalRule)
        }

        if (!universalRule.source) {
          universalRule.source = universal.source
        }

        universal.remove()
      }

      let backdropRule = universalRule.clone({
        selectors: ['::backdrop'],
      })

      universalRule.after(backdropRule)
    }
  }
}

Name	Size	Permission
cacheInvalidation.js	1386 bytes	0644
collapseAdjacentRules.js	1531 bytes	0644
collapseDuplicateDeclarations.js	2952 bytes	0644
content.js	9196 bytes	0644
defaultExtractor.js	7551 bytes	0644
evaluateTailwindFunctions.js	7415 bytes	0644
expandApplyAtRules.js	19407 bytes	0644
expandTailwindAtRules.js	8242 bytes	0644
findAtConfigPath.js	1363 bytes	0644
generateRules.js	28954 bytes	0644
getModuleDependencies.js	2250 bytes	0644
load-config.ts	1284 bytes	0644
normalizeTailwindDirectives.js	2858 bytes	0644
offsets.js	12190 bytes	0644
partitionApplyAtRules.js	1009 bytes	0644
regex.js	1856 bytes	0644
remap-bitfield.js	2548 bytes	0644
resolveDefaultsAtRules.js	4757 bytes	0644
setupContextUtils.js	42643 bytes	0644
setupTrackingContext.js	6252 bytes	0644
sharedState.js	1445 bytes	0644
substituteScreenAtRules.js	600 bytes	0644

Command Bosku:

File Content: resolveDefaultsAtRules.js

File Content: `resolveDefaultsAtRules.js`