add removeMarks command

packages/core/src/commands/removeMarks.ts

@@ -0,0 +1,28 @@
+import { Editor } from '../Editor'
+
+declare module '../Editor' {
+  interface Editor {
+    removeMarks(): Editor,
+  }
+}
+
+export default function removeMarks(next: Function, editor: Editor): void {
+  const { state, view, schema } = editor
+  const { selection, tr } = state
+  const { from, to, empty } = selection
+  let transaction = tr
+
+  if (empty) {
+    next()
+    return
+  }
+
+  Object
+    .entries(schema.marks)
+    .forEach(([name, mark]) => {
+      transaction.removeMark(from, to, mark)
+    })
+
+  view.dispatch(transaction)
+  next()
+}