Function unescape

packages/tailwindcss/src/utils/escape.ts:75–97

(escaped: string)

}

export function unescape(escaped: string) {
  return escaped.replace(/\\([\dA-Fa-f]{1,6}[\t\n\f\r ]?|[\S\s])/g, (match) => {
    if (match.length <= 2) {
      return match[1]
    }

    let codePoint = Number.parseInt(match.slice(1).trim(), 16)

    if (
      // Invalid codepoint: https://infra.spec.whatwg.org/#code-point
      codePoint === 0x0000 ||
      codePoint > 0x10ffff ||
      // Is surrogate: https://infra.spec.whatwg.org/#leading-surrogate
      //  - A leading surrogate is a code point that is in the range U+D800 to U+DBFF, inclusive.
      //  - A trailing surrogate is a code point that is in the range U+DC00 to U+DFFF, inclusive.
      (codePoint >= 0xd800 && codePoint <= 0xdfff)
    ) {
      return '\uFFFD'
    }

    return String.fromCodePoint(codePoint)
  })
}