refactor: move keyNames related code into runtime

Author: jkzing

Diff for: src/compiler/codegen/events.js

@@ -16,18 +16,6 @@ const keyCodes: { [key: string]: number | Array<number> } = {
   'delete': [8, 46]
 }
 
-const keyNames: { [key: string]: string | Array<string> } = {
-  esc: 'Escape',
-  tab: 'Tab',
-  enter: 'Enter',
-  space: ' ',
-  up: 'ArrowUp',
-  left: 'ArrowLeft',
-  right: 'ArrowRight',
-  down: 'ArrowDown',
-  'delete': ['Backspace', 'Delete']
-}
-
 // #4868: modifiers that prevent the execution of the listener
 // need to explicitly return null so that we can determine whether to remove
 // the listener for .once
@@ -157,7 +145,6 @@ function genFilterCode (key: string): string {
     `_k($event.keyCode,` +
     `${JSON.stringify(key)},` +
     `${JSON.stringify(code)},` +
-    `$event.key,` +
-    `${JSON.stringify(keyNames[key])})`
+    `$event.key)`
   )
 }

Diff for: src/core/instance/render-helpers/check-keycodes.js

@@ -3,6 +3,18 @@
 import config from 'core/config'
 import { hyphenate } from 'shared/util'
 
+const keyNames: { [key: string]: string | Array<string> } = {
+  esc: 'Escape',
+  tab: 'Tab',
+  enter: 'Enter',
+  space: ' ',
+  up: 'ArrowUp',
+  left: 'ArrowLeft',
+  right: 'ArrowRight',
+  down: 'ArrowDown',
+  'delete': ['Backspace', 'Delete']
+}
+
 function isKeyNotMatch<T> (expect: T | Array<T>, actual: T): boolean {
   if (Array.isArray(expect)) {
     return expect.indexOf(actual) === -1
@@ -20,10 +32,10 @@ export function checkKeyCodes (
   eventKeyCode: number,
   key: string,
   builtInAlias?: number | Array<number>,
-  eventKeyName?: string,
-  builtInName?: string | Array<string>
+  eventKeyName?: string
 ): ?boolean {
   const keyCodes = config.keyCodes[key] || builtInAlias
+  const builtInName: string | Array<string> = keyNames[key]
   if (builtInName && keyCodes === builtInAlias && eventKeyName) {
     return isKeyNotMatch(builtInName, eventKeyName)
   } else if (keyCodes) {