add blockquote commands

packages/core/src/commands/lift.ts

@@ -0,0 +1,16 @@
+import { lift } from 'prosemirror-commands'
+import { NodeType } from 'prosemirror-model'
+import { Command } from '../types'
+import nodeIsActive from '../utils/nodeIsActive'
+import getNodeType from '../utils/getNodeType'
+
+export default (typeOrName: string | NodeType, attributes = {}): Command => ({ state, dispatch }) => {
+  const type = getNodeType(typeOrName, state.schema)
+  const isActive = nodeIsActive(state, type, attributes)
+
+  if (!isActive) {
+    return false
+  }
+
+  return lift(state, dispatch)
+}