fix all eslint errors

packages/core/src/CommandManager.ts

@@ -8,8 +8,11 @@ export default class CommandManager {
 
   commands: { [key: string]: any } = {}
 
+  methodNames: string[] = []
+
   constructor(editor: Editor) {
     this.editor = editor
+    this.methodNames = getAllMethodNames(this.editor)
   }
 
   /**
@@ -23,7 +26,7 @@ export default class CommandManager {
       throw new Error(`tiptap: command '${name}' is already defined.`)
     }
 
-    if (getAllMethodNames(this.editor).includes(name)) {
+    if (this.methodNames.includes(name)) {
       throw new Error(`tiptap: '${name}' is a protected name.`)
     }
 

packages/core/src/Editor.ts

@@ -40,14 +40,14 @@ export interface Commands {}
 export type CommandNames = Extract<keyof Commands, string>
 
 export type SingleCommands = {
-  [Command in keyof Commands]: Commands[Command] extends (...args: any[]) => any
-  ? (...args: Parameters<Commands[Command]>) => boolean
+  [Item in keyof Commands]: Commands[Item] extends (...args: any[]) => any
+  ? (...args: Parameters<Commands[Item]>) => boolean
   : never
 }
 
 export type ChainedCommands = {
-  [Command in keyof Commands]: Commands[Command] extends (...args: any[]) => any
-  ? (...args: Parameters<Commands[Command]>) => ChainedCommands
+  [Item in keyof Commands]: Commands[Item] extends (...args: any[]) => any
+  ? (...args: Parameters<Commands[Item]>) => ChainedCommands
   : never
 } & {
   run: () => boolean

packages/core/src/utils/getAllMethodNames.ts

@@ -1,10 +1,4 @@
-export default function getAllMethodNames(obj: Object) {
-  const methods = new Set()
-
-  while (obj = Reflect.getPrototypeOf(obj)) {
-    const keys = Reflect.ownKeys(obj)
-    keys.forEach(k => methods.add(k))
-  }
-
-  return Array.from(methods)
+export default function getAllMethodNames(obj: Object): string[] {
+  return Reflect.ownKeys(Reflect.getPrototypeOf(obj))
+    .map(name => name.toString())
 }