askirmas / postcss-d-ts

function collector({

  identifiers,

  identifierParser,

  identifierMatchIndex,

  identifierCleanupParser,

  identifierCleanupReplace,

  allowedAtRules,

}: {

  identifiers: Record<string, true>,

  identifierParser: RegExp,

  identifierMatchIndex: number,

  identifierCleanupParser: RegExp,

  identifierCleanupReplace: string,

  allowedAtRules: Set<string>

}) {

  return ({selectors, parent}: CollectingArg) => {

    if (parent?.type === "atrule") {

      const {name} = parent

      if (name && !allowedAtRules.has(name))

        return identifiers

    }

    //TODO consider postcss-selector-parser

    const {length} = selectors

    for (let i = length; i--; ) {

      const selector = selectors[i]

      let parsed: RegExpExecArray | null

      // TODO check that parser is moving

      while (parsed = identifierParser.exec(selector)) {

        const identifier = parsed[identifierMatchIndex]

        .replace(identifierCleanupParser, identifierCleanupReplace)

        identifiers[identifier] = true

      }

    }

    return identifiers