Function visitor

packages/babel-plugin-formatjs/visitors/jsx-opening-element.ts:24–165

(
  path,
  {
    opts,
    file: {
      opts: {filename},
    },
  }
)

  PluginPass & State,
  t.JSXOpeningElement
> = function (
  path,
  {
    opts,
    file: {
      opts: {filename},
    },
  }
) {
  const {
    removeDefaultMessage,
    idInterpolationPattern,
    overrideIdFn,
    ast,
    preserveWhitespace,
    flatten,
    throws,
    onMsgError,
  } = opts as Options

  const {componentNames, messages} = this
  if (wasExtracted(path)) {
    return
  }

  const name = path.get('name')

  if (!componentNames.find(n => name.isJSXIdentifier({name: n}))) {
    return
  }

  const attributes = path
    .get('attributes')
    .filter(attr => attr.isJSXAttribute())

  let descriptorPath: MessageDescriptorPath
  let descriptor: MessageDescriptor
  try {
    descriptorPath = createMessageDescriptor(
      attributes.map(attr => [
        attr.get('name') as NodePath<t.JSXIdentifier>,
        attr.get('value') as
          | NodePath<t.StringLiteral>
          | NodePath<t.JSXExpressionContainer>,
      ])
    )

    // In order for a default message to be extracted when
    // declaring a JSX element, it must be done with standard
    // `key=value` attributes. But it's completely valid to
    // write `<FormattedMessage {...descriptor} />`, because it will be
    // skipped here and extracted elsewhere. The descriptor will
    // be extracted only (storeMessage) if a `defaultMessage` prop.
    if (!descriptorPath.defaultMessage) {
      return
    }

    descriptor = evaluateMessageDescriptor(