Method insertRule

src/lib/stylesheet.js:107–144

(rule, index)

  }

  insertRule(rule, index) {
    invariant(isString(rule), '`insertRule` accepts only strings')

    if (typeof window === 'undefined') {
      if (typeof index !== 'number') {
        index = this._serverSheet.cssRules.length
      }

      this._serverSheet.insertRule(rule, index)
      return this._rulesCount++
    }

    if (this._optimizeForSpeed) {
      const sheet = this.getSheet()
      if (typeof index !== 'number') {
        index = sheet.cssRules.length
      }

      // this weirdness for perf, and chrome's weird bug
      // https://stackoverflow.com/questions/20007992/chrome-suddenly-stopped-accepting-insertrule
      try {
        sheet.insertRule(rule, index)
      } catch (error) {
        if (!isProd) {
          console.warn(
            `StyleSheet: illegal rule: \n\n${rule}\n\nSee https://stackoverflow.com/q/20007992 for more info`
          )
        }

        return -1
      }
    } else {
      const insertionPoint = this._tags[index]
      this._tags.push(this.makeStyleTag(this._name, rule, insertionPoint))
    }

    return this._rulesCount++
  }

  replaceRule(index, rule) {
    if (this._optimizeForSpeed || typeof window === 'undefined') {