Function isRootTemplateMessage

packages/core/src/render3/i18n/i18n_util.ts:159–161

(subTemplateIndex: number)

// Returns whether the given value corresponds to a root template message,
// or a sub-template.
export function isRootTemplateMessage(subTemplateIndex: number): subTemplateIndex is -1 {
  return subTemplateIndex === -1;
}