I’ve published @fluent/bundle 0.14 which now exposes the new API for FluentBundle, FluentResource, FluentNumber, and FluentDateTime. The final design is a result of 3 iterations and a lot of feedback from stakeholders and implementors. Thank you for your help. I hope the new API will serve well its purposes.
In summary: format is now called formatPattern and has stricter requirements regarding its arguments. It may also throw if errors are not passed as the third argument. addMessages has been removed in favor of addResource, which takes an instance of FluentResource. The static FluentResource.fromString() method has been removed in favor of simply using the constructor: new FluentResource(text).
Please consult the @fluent/bundle changelog for details: