Function getICUMessageValue

packages/babel-plugin-formatjs/utils.ts:155–196

(
  messagePath?:
    | NodePath<t.StringLiteral>
    | NodePath<t.TemplateLiteral>
    | NodePath<t.JSXExpressionContainer>,
  {isJSXSource = false} = {},
  preserveWhitespace?: Options['preserveWhitespace']
)

}

function getICUMessageValue(
  messagePath?:
    | NodePath<t.StringLiteral>
    | NodePath<t.TemplateLiteral>
    | NodePath<t.JSXExpressionContainer>,
  {isJSXSource = false} = {},
  preserveWhitespace?: Options['preserveWhitespace']
) {
  if (!messagePath) {
    return ''
  }
  let message = getMessageDescriptorValue(messagePath, true)

  if (!preserveWhitespace) {
    message = normalizeMessageWhitespace(message)
  }

  try {
    parse(message)
  } catch (parseError) {
    if (
      isJSXSource &&
      messagePath.isLiteral() &&
      message.indexOf('\\\\') >= 0
    ) {
      throw messagePath.buildCodeFrameError(
        '[React Intl] Message failed to parse. ' +
          'It looks like `\\`s were used for escaping, ' +
          "this won't work with JSX string literals. " +
          'Wrap with `{}`. ' +
          'See: http://facebook.github.io/react/docs/jsx-gotchas.html'
      )
    }

    throw messagePath.buildCodeFrameError(
      '[React Intl] Message failed to parse. ' +
        'See: https://formatjs.github.io/docs/core-concepts/icu-syntax' +
        `\n${parseError}`
    )
  }
  return message
}
const EXTRACTED = Symbol('FormatJSExtracted')
/**
 * Tag a node as extracted