export function parseJsObject(str: string, offset = 0) {
  let i = offset
  const len = str.length
  let start = -1
  let end = -1

  const depth = {
    '{': 0,
    '[': 0,
  }

  const possibleQuotes = {
    '"': true,
    '\'': true,
    '`': true,
  }
  let inQuote: string | null = null
  let escapeNextQuote = false

  while (i < len) {
    const char = str[i]
    if (char in possibleQuotes && !escapeNextQuote) {
      if (inQuote === null) {
        inQuote = char
      } else if (char === inQuote) {
        inQuote = null
      }
    } else if (inQuote != null) {
      escapeNextQuote = char === '\\' && !escapeNextQuote
    } else if (inQuote == null && char in depth) {
      if (start === -1) {
        start = i
      }
      depth[char] += 1
    } else if (inQuote == null && (
      char === '}' || char === ']'
    )) {
      if (char === '}') depth['{'] -= 1
      if (char === ']') depth['['] -= 1

      if (depth['{'] === 0 && depth['['] === 0) {
        end = i + 1
        break
      }
    }
    i += 1
  }

  if (start === -1 && end === -1) return null
  if (depth['{'] !== 0 || depth['['] !== 0) throw new SyntaxError('Mismatched brackets')
  if (inQuote) throw new SyntaxError('Unclosed string')

  return str.substring(start, end)
}