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This module implements the state object of a ProseMirror editor, along
with the representation of the selection and the plugin abstraction.
### Editor State
ProseMirror keeps all editor state (the things, basically, that would
be required to create an editor just like the current one) in a single
[object](#state.EditorState). That object is updated (creating a new
state) by applying [transactions](#state.Transaction) to it.
@EditorState
@EditorStateConfig
@Transaction
@Command
### Selection
A ProseMirror selection can be one of several types. This module
defines types for classical [text selections](#state.TextSelection)
(of which cursors are a special case) and [_node_
selections](#state.NodeSelection), where a specific document node is
selected. It is possible to extend the editor with custom selection
types.
@Selection
@TextSelection
@NodeSelection
@AllSelection
@SelectionRange
@SelectionBookmark
### Plugin System
To make it easy to package and enable extra editor functionality,
ProseMirror has a plugin system.
@PluginSpec
@StateField
@PluginView
@Plugin
@PluginKey