openExternal doesn't exist on figma PluginAPI

I’d like to use the openExternal in dev mode. but can’t see it available.
Any idea why?

Could you add more context? What do you mean by “but can’t see it available”?

TS2339: Property ‘openExternal’ does not exist on type ‘PluginAPI’.
When looking at the PluginAPI declaration, I can’t find that function.
I’m using create-Figma-plugin

Update the typings file.