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If it's true, is there a plan to remove the dependency?

Don't think there is any plan to remove this at the moment

To create a new Resource Provider you must write it using go language?

Can't find how to create a new resource provider in the doc

<https://www.pulumi.com/docs/intro/concepts/programming-model/#authoring-a-new-componentu>

or <https://www.pulumi.com/docs/intro/concepts/programming-model/#dynamicproviders>

but no doesn't have to be written in go, could be in the language of your choice