Function virtual

packages/core/src/sheets.ts:129–167

(includeResumeData?: boolean)

 * @returns
 */
export function virtual(includeResumeData?: boolean): Sheet<string[]> {
  const target: string[] = []

  return {
    target,

    snapshot() {
      // collect current rules
      const rules = [...target]

      return () => {
        // remove all existing rules and add all snapshot rules back
        target.splice(0, target.length, ...rules)
      }
    },

    clear() {
      target.length = 0
    },

    destroy() {
      this.clear()
    },

    insert(css, index, rule) {
      target.splice(
        index,
        0,
        includeResumeData
          ? `/*!${rule.p.toString(36)},${(rule.o * 2).toString(36)}${
              rule.n ? ',' + rule.n : ''
            }*/${css}`
          : css,
      )
    },

    resume: noop,
  }
}

/**
 * Returns a sheet useable in the current environment.