This library has been split up into separate modules. This is the old monolithic package, which is no longer maintained. Use prosemirror-view, prosemirror-model, etc instead.
To use the ProseMirror library, please install modules like
prosemirror-model, prosemirror-view, and so on. This package name
was used in the past, when ProseMirror was a monolithic library, but
is currently not used for anything.