add custom event emitter

packages/core/package.json

@@ -15,7 +15,6 @@
     "@types/prosemirror-dropcursor": "^1.0.0",
     "@types/prosemirror-gapcursor": "^1.0.1",
     "collect.js": "^4.20.3",
-    "events": "^3.1.0",
     "prosemirror-commands": "^1.1.3",
     "prosemirror-dropcursor": "^1.3.2",
     "prosemirror-gapcursor": "^1.1.4",

packages/core/src/Editor.ts

@@ -1,4 +1,3 @@
-import { EventEmitter } from 'events'
 import { EditorState, TextSelection } from 'prosemirror-state'
 import { EditorView} from 'prosemirror-view'
 import { Schema, DOMParser, DOMSerializer } from 'prosemirror-model'
@@ -19,6 +18,7 @@ import getSchemaTypeByName from './utils/getSchemaTypeByName'
 import ExtensionManager from './ExtensionManager'
 import Extension from './Extension'
 import Node from './Node'
+import EventEmitter from './EventEmitter'
 
 type EditorContent = string | JSON | null
 type Command = (next: Function, editor: Editor, ...args: any) => any
@@ -73,7 +73,9 @@ export class Editor extends EventEmitter {
     const command = this.commands[name]
 
     if (!command) {
-      throw new Error(`tiptap: command '${name}' not found.`)
+      // TODO: prevent vue devtools to throw error
+      // throw new Error(`tiptap: command '${name}' not found.`)
+      return
     }
     
     return (...args: any) => command(...args)

packages/core/src/EventEmitter.ts

@@ -0,0 +1,42 @@
+export default class EventEmitter {
+
+  _callbacks: { [key: string]: Function[] } = {}
+
+  on(event: string, fn: Function) {
+    if (!this._callbacks[event]) {
+      this._callbacks[event] = []
+    }
+
+    this._callbacks[event].push(fn)
+    
+    return this
+  }
+
+  emit(event: string, ...args: any) {
+    const callbacks = this._callbacks[event]
+
+    if (callbacks) {
+      callbacks.forEach(callback => callback.apply(this, args))
+    }
+
+    return this
+  }
+
+  off(event: string, fn?: Function) {
+    const callbacks = this._callbacks[event]
+
+    if (callbacks) {
+      if (fn) {
+        this._callbacks[event] = callbacks.filter(callback => callback !== fn)
+      } else {
+        delete this._callbacks[event]
+      }
+    }
+
+    return this
+  }
+
+  removeAllListeners() {
+    this._callbacks = {}
+  }
+}