Function asMessage

packages/compiler/src/template/pipeline/src/ingest.ts:1308–1316

* Ensures that the i18nMeta, if provided, is an i18n.Message.

(i18nMeta: i18n.I18nMeta | null | undefined)

 * Ensures that the i18nMeta, if provided, is an i18n.Message.
 */
function asMessage(i18nMeta: i18n.I18nMeta | null | undefined): i18n.Message | null {
  if (i18nMeta == null) {
    return null;
  }
  if (!(i18nMeta instanceof i18n.Message)) {
    throw Error(`Expected i18n meta to be a Message, but got: ${i18nMeta.constructor.name}`);
  }
  return i18nMeta;
}

/**
 * Process all of the bindings on an element in the template AST and convert them to their IR