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This is a stub types definition. prosemirror-state provides its own type definitions, so you do not need this installed.

@types/prosemirror-state

This is a stub types definition for @types/prosemirror-state (https://github.com/prosemirror/prosemirror-state#readme).

prosemirror-state provides its own type definitions, so you don't need @types/prosemirror-state installed!