Add format_text command, and editor.marks state (#3308)

* add format_text command, refactor command extensions

* update onChange to not receive selection

* update docs

* fix tests

packages/slate-history/src/history-command.ts

@@ -16,24 +16,14 @@ export const HistoryCommand = {
    */
 
   isHistoryCommand(value: any): value is HistoryCommand {
-    return (
-      HistoryCommand.isRedoCommand(value) || HistoryCommand.isUndoCommand(value)
-    )
-  },
+    if (Command.isCommand(value)) {
+      switch (value.type) {
+        case 'redo':
+        case 'undo':
+          return true
+      }
+    }
 
-  /**
-   * Check if a value is a `RedoCommand` object.
-   */
-
-  isRedoCommand(value: any): value is RedoCommand {
-    return Command.isCommand(value) && value.type === 'redo'
-  },
-
-  /**
-   * Check if a value is an `UndoCommand` object.
-   */
-
-  isUndoCommand(value: any): value is UndoCommand {
-    return Command.isCommand(value) && value.type === 'undo'
+    return false
   },
 }

packages/slate-history/src/with-history.ts

@@ -13,11 +13,14 @@ export const withHistory = (editor: Editor): HistoryEditor => {
   editor.history = { undos: [], redos: [] }
 
   editor.exec = (command: Command) => {
-    if (HistoryEditor.isHistoryEditor(editor)) {
+    if (
+      HistoryEditor.isHistoryEditor(editor) &&
+      HistoryCommand.isHistoryCommand(command)
+    ) {
       const { history } = editor
       const { undos, redos } = history
 
-      if (redos.length > 0 && HistoryCommand.isRedoCommand(command)) {
+      if (command.type === 'redo' && redos.length > 0) {
         const batch = redos[redos.length - 1]
 
         HistoryEditor.withoutSaving(editor, () => {
@@ -33,7 +36,7 @@ export const withHistory = (editor: Editor): HistoryEditor => {
         return
       }
 
-      if (undos.length > 0 && HistoryCommand.isUndoCommand(command)) {
+      if (command.type === 'undo' && undos.length > 0) {
         const batch = undos[undos.length - 1]
 
         HistoryEditor.withoutSaving(editor, () => {