lmexif-sniffer

/** Flatten nested JSON-like *obj* into {path, value} rows (Python exif-sniffer parity). */
export function flattenToMetadataList(obj: unknown, prefix = ""): Array<{ path: string; value: unknown }> {
  const rows: Array<{ path: string; value: unknown }> = [];
  if (obj && typeof obj === "object" && !Array.isArray(obj)) {
    const o = obj as Record<string, unknown>;
    const keys = Object.keys(o);
    if (keys.length === 0) {
      rows.push({ path: prefix || "/", value: {} });
      return rows;
    }
    for (const k of keys) {
      const p = prefix ? `${prefix}.${k}` : k;
      rows.push(...flattenToMetadataList(o[k], p));
    }
  } else if (Array.isArray(obj)) {
    if (obj.length === 0) {
      rows.push({ path: prefix || "/", value: [] });
      return rows;
    }
    for (let i = 0; i < obj.length; i++) {
      const p = prefix ? `${prefix}[${i}]` : `[${i}]`;
      rows.push(...flattenToMetadataList(obj[i], p));
    }
  } else {
    rows.push({ path: prefix || "/", value: obj });
  }
  return rows;
}