Function extractJsonStringField

src/utils/sessionStoragePortable.ts:53–76

(
  text: string,
  key: string,
)

 * Returns the first match, or undefined if not found.
 */
export function extractJsonStringField(
  text: string,
  key: string,
): string | undefined {
  const patterns = [`"${key}":"`, `"${key}": "`]
  for (const pattern of patterns) {
    const idx = text.indexOf(pattern)
    if (idx < 0) continue

    const valueStart = idx + pattern.length
    let i = valueStart
    while (i < text.length) {
      if (text[i] === '\\') {
        i += 2
        continue
      }
      if (text[i] === '"') {
        return unescapeJsonString(text.slice(valueStart, i))
      }
      i++
    }
  }
  return undefined
}

/**
 * Like extractJsonStringField but finds the LAST occurrence.