diff --git a/core/utils/keycodes.js b/core/utils/keycodes.js
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+/**
+ * @license
+ * Visual Blocks Editor
+ *
+ * Copyright 2019 Google Inc.
+ * https://developers.google.com/blockly/
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * @fileoverview Constant declarations for common key codes.
+ * These methods are not specific to Blockly, and could be factored out into
+ * a JavaScript framework such as Closure.
+ * @author samelh@google.com (Sam El-Husseini)
+ */
+'use strict';
+
+goog.provide('Blockly.utils.KeyCodes');
+
+/**
+ * Key codes for common characters.
+ *
+ * Copied from Closure's goog.events.KeyCodes
+ *
+ * This list is not localized and therefore some of the key codes are not
+ * correct for non US keyboard layouts. See comments below.
+ *
+ * @enum {number}
+ */
+Blockly.utils.KeyCodes = {
+  WIN_KEY_FF_LINUX: 0,
+  MAC_ENTER: 3,
+  BACKSPACE: 8,
+  TAB: 9,
+  NUM_CENTER: 12,  // NUMLOCK on FF/Safari Mac
+  ENTER: 13,
+  SHIFT: 16,
+  CTRL: 17,
+  ALT: 18,
+  PAUSE: 19,
+  CAPS_LOCK: 20,
+  ESC: 27,
+  SPACE: 32,
+  PAGE_UP: 33,    // also NUM_NORTH_EAST
+  PAGE_DOWN: 34,  // also NUM_SOUTH_EAST
+  END: 35,        // also NUM_SOUTH_WEST
+  HOME: 36,       // also NUM_NORTH_WEST
+  LEFT: 37,       // also NUM_WEST
+  UP: 38,         // also NUM_NORTH
+  RIGHT: 39,      // also NUM_EAST
+  DOWN: 40,       // also NUM_SOUTH
+  PLUS_SIGN: 43,  // NOT numpad plus
+  PRINT_SCREEN: 44,
+  INSERT: 45,  // also NUM_INSERT
+  DELETE: 46,  // also NUM_DELETE
+  ZERO: 48,
+  ONE: 49,
+  TWO: 50,
+  THREE: 51,
+  FOUR: 52,
+  FIVE: 53,
+  SIX: 54,
+  SEVEN: 55,
+  EIGHT: 56,
+  NINE: 57,
+  FF_SEMICOLON: 59,  // Firefox (Gecko) fires this for semicolon instead of 186
+  FF_EQUALS: 61,     // Firefox (Gecko) fires this for equals instead of 187
+  FF_DASH: 173,      // Firefox (Gecko) fires this for dash instead of 189
+  // Firefox (Gecko) fires this for # on UK keyboards, rather than
+  // Shift+SINGLE_QUOTE.
+  FF_HASH: 163,
+  QUESTION_MARK: 63,  // needs localization
+  AT_SIGN: 64,
+  A: 65,
+  B: 66,
+  C: 67,
+  D: 68,
+  E: 69,
+  F: 70,
+  G: 71,
+  H: 72,
+  I: 73,
+  J: 74,
+  K: 75,
+  L: 76,
+  M: 77,
+  N: 78,
+  O: 79,
+  P: 80,
+  Q: 81,
+  R: 82,
+  S: 83,
+  T: 84,
+  U: 85,
+  V: 86,
+  W: 87,
+  X: 88,
+  Y: 89,
+  Z: 90,
+  META: 91,  // WIN_KEY_LEFT
+  WIN_KEY_RIGHT: 92,
+  CONTEXT_MENU: 93,
+  NUM_ZERO: 96,
+  NUM_ONE: 97,
+  NUM_TWO: 98,
+  NUM_THREE: 99,
+  NUM_FOUR: 100,
+  NUM_FIVE: 101,
+  NUM_SIX: 102,
+  NUM_SEVEN: 103,
+  NUM_EIGHT: 104,
+  NUM_NINE: 105,
+  NUM_MULTIPLY: 106,
+  NUM_PLUS: 107,
+  NUM_MINUS: 109,
+  NUM_PERIOD: 110,
+  NUM_DIVISION: 111,
+  F1: 112,
+  F2: 113,
+  F3: 114,
+  F4: 115,
+  F5: 116,
+  F6: 117,
+  F7: 118,
+  F8: 119,
+  F9: 120,
+  F10: 121,
+  F11: 122,
+  F12: 123,
+  NUMLOCK: 144,
+  SCROLL_LOCK: 145,
+
+  // OS-specific media keys like volume controls and browser controls.
+  FIRST_MEDIA_KEY: 166,
+  LAST_MEDIA_KEY: 183,
+
+  SEMICOLON: 186,             // needs localization
+  DASH: 189,                  // needs localization
+  EQUALS: 187,                // needs localization
+  COMMA: 188,                 // needs localization
+  PERIOD: 190,                // needs localization
+  SLASH: 191,                 // needs localization
+  APOSTROPHE: 192,            // needs localization
+  TILDE: 192,                 // needs localization
+  SINGLE_QUOTE: 222,          // needs localization
+  OPEN_SQUARE_BRACKET: 219,   // needs localization
+  BACKSLASH: 220,             // needs localization
+  CLOSE_SQUARE_BRACKET: 221,  // needs localization
+  WIN_KEY: 224,
+  MAC_FF_META:
+      224,  // Firefox (Gecko) fires this for the meta key instead of 91
+  MAC_WK_CMD_LEFT: 91,   // WebKit Left Command key fired, same as META
+  MAC_WK_CMD_RIGHT: 93,  // WebKit Right Command key fired, different from META
+  WIN_IME: 229,
+
+  // "Reserved for future use". Some programs (e.g. the SlingPlayer 2.4 ActiveX
+  // control) fire this as a hacky way to disable screensavers.
+  VK_NONAME: 252,
+
+  // We've seen users whose machines fire this keycode at regular one
+  // second intervals. The common thread among these users is that
+  // they're all using Dell Inspiron laptops, so we suspect that this
+  // indicates a hardware/bios problem.
+  // http://en.community.dell.com/support-forums/laptop/f/3518/p/19285957/19523128.aspx
+  PHANTOM: 255
+};