From dc98409babb758be6e1c9d1189967a4530d730a6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Philipp=20Ku=CC=88hn?= <kontakt@philipp-kuehn.com>
Date: Wed, 1 Apr 2020 21:15:23 +0200
Subject: [PATCH] add custom event emitter

---
 packages/core/package.json        |  1 -
 packages/core/src/Editor.ts       |  6 +++--
 packages/core/src/EventEmitter.ts | 42 +++++++++++++++++++++++++++++++
 yarn.lock                         |  2 +-
 4 files changed, 47 insertions(+), 4 deletions(-)
 create mode 100644 packages/core/src/EventEmitter.ts

diff --git a/packages/core/package.json b/packages/core/package.json
index beea0d0f..66a9f78d 100644
--- a/packages/core/package.json
+++ b/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",
diff --git a/packages/core/src/Editor.ts b/packages/core/src/Editor.ts
index db6362c8..33ba50b1 100644
--- a/packages/core/src/Editor.ts
+++ b/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)
diff --git a/packages/core/src/EventEmitter.ts b/packages/core/src/EventEmitter.ts
new file mode 100644
index 00000000..f15c81ce
--- /dev/null
+++ b/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 = {}
+  }
+}
diff --git a/yarn.lock b/yarn.lock
index 6c4199f8..adbb67ad 100644
--- a/yarn.lock
+++ b/yarn.lock
@@ -5541,7 +5541,7 @@ eventemitter3@^3.1.0:
   resolved "https://registry.yarnpkg.com/eventemitter3/-/eventemitter3-3.1.2.tgz#2d3d48f9c346698fce83a85d7d664e98535df6e7"
   integrity sha512-tvtQIeLVHjDkJYnzf2dgVMxfuSGJeM/7UCG17TT4EumTfNtF+0nebF/4zWOIkCreAbtNqhGEboB6BWrwqNaw4Q==
 
-events@^3.0.0, events@^3.1.0:
+events@^3.0.0:
   version "3.1.0"
   resolved "https://registry.yarnpkg.com/events/-/events-3.1.0.tgz#84279af1b34cb75aa88bf5ff291f6d0bd9b31a59"
   integrity sha512-Rv+u8MLHNOdMjTAFeT3nCjHn2aGlx435FP/sDHNaRhDEMwyI/aB22Kj2qIN8R0cw3z28psEQLYwxVKLsKrMgWg==