Function processDescriptor

packages/unplugin/transform.ts:241–343

(
    descriptor: MessageDescriptor,
    locations: DescriptorLocation,
    isJSX: boolean
  )

  }

  function processDescriptor(
    descriptor: MessageDescriptor,
    locations: DescriptorLocation,
    isJSX: boolean
  ): void {
    let {defaultMessage, description} = descriptor
    let existingId = descriptor.id

    // Normalize whitespace on defaultMessage
    if (defaultMessage && !preserveWhitespace) {
      defaultMessage = normalizeMessageWhitespace(defaultMessage)
    }

    // Apply flatten transformation (hoist selectors + normalize ICU format via printAST)
    // This must happen before ID generation so the ID matches formatjs extract and babel-plugin-formatjs
    if (flatten && defaultMessage) {
      try {
        defaultMessage = printAST(hoistSelectors(parse(defaultMessage)))
      } catch {
        // If parsing fails, keep the original message
      }
    }

    // Generate ID
    let newId = existingId
    if (overrideIdFn) {
      newId = overrideIdFn(existingId, defaultMessage, description, id)
    } else if (!existingId && idInterpolationPattern && defaultMessage) {
      newId = interpolateName(
        {resourcePath: id} as any,
        idInterpolationPattern,
        {
          content: description
            ? `${defaultMessage}#${description}`
            : defaultMessage,
        }
      )
    }

    if (!newId && !defaultMessage) return

    if (!s) s = new MagicString(code)

    // Insert/update id
    if (newId) {
      if (locations.id) {
        // Replace existing id value
        s.overwrite(locations.id.start, locations.id.end, JSON.stringify(newId))
      } else if (locations.insertionPoint != null) {
        // Insert id at a stable position (after `{` for objects, before first attr for JSX)
        if (isJSX) {
          s.appendLeft(locations.insertionPoint, ` id=${JSON.stringify(newId)}`)
        } else {
          s.appendRight(
            locations.insertionPoint,
            `id: ${JSON.stringify(newId)}, `
          )
        }