Function normalizeImageBlocks

src/bridge/inboundMessages.ts:54–75

(
  blocks: Array<ContentBlockParam>,
)

 * normalization is needed (zero allocation on the happy path).
 */
export function normalizeImageBlocks(
  blocks: Array<ContentBlockParam>,
): Array<ContentBlockParam> {
  if (!blocks.some(isMalformedBase64Image)) return blocks

  return blocks.map(block => {
    if (!isMalformedBase64Image(block)) return block
    const src = block.source as unknown as Record<string, unknown>
    const mediaType =
      typeof src.mediaType === 'string' && src.mediaType
        ? src.mediaType
        : detectImageFormatFromBase64(block.source.data)
    return {
      ...block,
      source: {
        type: 'base64' as const,
        media_type: mediaType as Base64ImageSource['media_type'],
        data: block.source.data,
      },
    }
  })
}

function isMalformedBase64Image(
  block: ContentBlockParam,