diff --git a/README.md b/README.md
index 85c2ac18c..730fc9af9 100644
--- a/README.md
+++ b/README.md
@@ -166,6 +166,10 @@ Xterm.js is maintained by [SourceLair](https://www.sourcelair.com/) and a few ex
 
 To contribute either code, documentation or issues to xterm.js please read the [Contributing document](CONTRIBUTING.md) beforehand. The development of xterm.js does not require any special tool. All you need is an editor that supports JavaScript/TypeScript and a browser. You will need Node.js installed locally to get all the features working in the demo.
 
+### Code structure
+
+`src/` is roughly split up into areas of functionality such as `renderer/` that handles all rendering and `utils/` which provides general utility functions. The `shared/` folder contains code that can be used from either the main thread or a web worker thread, all code inside a `shared/` folder should only ever import other code from a `shared/` folder to minimize the amount of code run what launching a web worker.
+
 ## License Agreement
 
 If you contribute code to this project, you are implicitly allowing your code to be distributed under the MIT license. You are also implicitly verifying that all code is your original work.
diff --git a/src/Buffer.test.ts b/src/Buffer.test.ts
index 210d29718..0607a573d 100644
--- a/src/Buffer.test.ts
+++ b/src/Buffer.test.ts
@@ -4,7 +4,7 @@
  */
 
 import { assert } from 'chai';
-import { ITerminal } from './Interfaces';
+import { ITerminal } from './Types';
 import { Buffer } from './Buffer';
 import { CircularList } from './utils/CircularList';
 import { MockTerminal } from './utils/TestUtils.test';
diff --git a/src/Buffer.ts b/src/Buffer.ts
index 39b0726c2..462cde56d 100644
--- a/src/Buffer.ts
+++ b/src/Buffer.ts
@@ -3,9 +3,8 @@
  * @license MIT
  */
 
-import { ITerminal, IBuffer } from './Interfaces';
 import { CircularList } from './utils/CircularList';
-import { LineData, CharData } from './Types';
+import { LineData, CharData, ITerminal, IBuffer } from './Types';
 
 export const CHAR_DATA_ATTR_INDEX = 0;
 export const CHAR_DATA_CHAR_INDEX = 1;
diff --git a/src/BufferSet.test.ts b/src/BufferSet.test.ts
index b9c1824db..009ebf2ec 100644
--- a/src/BufferSet.test.ts
+++ b/src/BufferSet.test.ts
@@ -4,7 +4,7 @@
  */
 
 import { assert } from 'chai';
-import { ITerminal } from './Interfaces';
+import { ITerminal } from './Types';
 import { BufferSet } from './BufferSet';
 import { Buffer } from './Buffer';
 import { MockTerminal } from './utils/TestUtils.test';
diff --git a/src/BufferSet.ts b/src/BufferSet.ts
index da8c75f24..553b20560 100644
--- a/src/BufferSet.ts
+++ b/src/BufferSet.ts
@@ -3,7 +3,7 @@
  * @license MIT
  */
 
-import { ITerminal, IBufferSet } from './Interfaces';
+import { ITerminal, IBufferSet } from './Types';
 import { Buffer } from './Buffer';
 import { EventEmitter } from './EventEmitter';
 
diff --git a/src/Charsets.ts b/src/Charsets.ts
index e62e3f9c0..fe0112ec7 100644
--- a/src/Charsets.ts
+++ b/src/Charsets.ts
@@ -3,7 +3,7 @@
  * @license MIT
  */
 
-import { ICharset } from './Interfaces';
+import { ICharset } from './Types';
 
 /**
  * The character sets supported by the terminal. These enable several languages
diff --git a/src/CompositionHelper.ts b/src/CompositionHelper.ts
index e588be783..2aa0449f1 100644
--- a/src/CompositionHelper.ts
+++ b/src/CompositionHelper.ts
@@ -3,7 +3,7 @@
  * @license MIT
  */
 
-import { ITerminal } from './Interfaces';
+import { ITerminal } from './Types';
 
 interface IPosition {
   start: number;
diff --git a/src/EventEmitter.test.ts b/src/EventEmitter.test.ts
index c1f0a0aba..f2d31cf64 100644
--- a/src/EventEmitter.test.ts
+++ b/src/EventEmitter.test.ts
@@ -13,18 +13,6 @@ describe('EventEmitter', () => {
     eventEmitter = new EventEmitter();
   });
 
-  describe('once', () => {
-    it('should trigger the listener only once', () => {
-      let count = 0;
-      const listener = () => count++;
-      eventEmitter.once('test', listener);
-      eventEmitter.emit('test');
-      assert.equal(count, 1);
-      eventEmitter.emit('test');
-      assert.equal(count, 1);
-    });
-  });
-
   describe('emit', () => {
     it('should emit events to listeners', () => {
       let count1 = 0;
diff --git a/src/EventEmitter.ts b/src/EventEmitter.ts
index 414eac895..440eab2b6 100644
--- a/src/EventEmitter.ts
+++ b/src/EventEmitter.ts
@@ -3,10 +3,10 @@
  * @license MIT
  */
 
-import { IEventEmitter, IListenerType } from './Interfaces';
+import { IEventEmitter } from 'xterm';
 
 export class EventEmitter implements IEventEmitter {
-  private _events: {[type: string]: IListenerType[]};
+  private _events: {[type: string]: ((...args: any[]) => void)[]};
 
   constructor() {
     // Restore the previous events if available, this will happen if the
@@ -14,12 +14,12 @@ export class EventEmitter implements IEventEmitter {
     this._events = this._events || {};
   }
 
-  public on(type: string, listener: IListenerType): void {
+  public on(type: string, listener: ((...args: any[]) => void)): void {
     this._events[type] = this._events[type] || [];
     this._events[type].push(listener);
   }
 
-  public off(type: string, listener: IListenerType): void {
+  public off(type: string, listener: ((...args: any[]) => void)): void {
     if (!this._events[type]) {
       return;
     }
@@ -28,7 +28,7 @@ export class EventEmitter implements IEventEmitter {
     let i = obj.length;
 
     while (i--) {
-      if (obj[i] === listener || obj[i].listener === listener) {
+      if (obj[i] === listener) {
         obj.splice(i, 1);
         return;
       }
@@ -41,16 +41,6 @@ export class EventEmitter implements IEventEmitter {
     }
   }
 
-  public once(type: string, listener: IListenerType): void {
-    function on(): void {
-      let args = Array.prototype.slice.call(arguments);
-      this.off(type, on);
-      listener.apply(this, args);
-    }
-    (<any>on).listener = listener;
-    this.on(type, on);
-  }
-
   public emit(type: string, ...args: any[]): void {
     if (!this._events[type]) {
       return;
@@ -61,7 +51,7 @@ export class EventEmitter implements IEventEmitter {
     }
   }
 
-  public listeners(type: string): IListenerType[] {
+  public listeners(type: string): ((...args: any[]) => void)[] {
     return this._events[type] || [];
   }
 
diff --git a/src/InputHandler.ts b/src/InputHandler.ts
index 96e34cc07..f71117f83 100644
--- a/src/InputHandler.ts
+++ b/src/InputHandler.ts
@@ -4,10 +4,9 @@
  * @license MIT
  */
 
-import { IInputHandler, ITerminal, IInputHandlingTerminal } from './Interfaces';
+import { CharData, IInputHandler, IInputHandlingTerminal, ITerminal } from './Types';
 import { C0 } from './EscapeSequences';
 import { DEFAULT_CHARSET } from './Charsets';
-import { CharData } from './Types';
 import { CHAR_DATA_CHAR_INDEX, CHAR_DATA_WIDTH_INDEX } from './Buffer';
 import { FLAGS } from './renderer/Types';
 import { wcwidth } from './CharWidth';
diff --git a/src/Interfaces.ts b/src/Interfaces.ts
deleted file mode 100644
index 5237fa5b9..000000000
--- a/src/Interfaces.ts
+++ /dev/null
@@ -1,377 +0,0 @@
-/**
- * Copyright (c) 2017 The xterm.js authors. All rights reserved.
- * @license MIT
- */
-
-import { ICharset, ILinkMatcherOptions } from './Interfaces';
-import { LinkMatcherHandler, LinkMatcherValidationCallback, LineData, FontWeight } from './Types';
-import { IColorSet, IRenderer } from './renderer/Interfaces';
-import { IMouseZoneManager } from './input/Interfaces';
-
-export interface IBrowser {
-  isNode: boolean;
-  userAgent: string;
-  platform: string;
-  isFirefox: boolean;
-  isMSIE: boolean;
-  isMac: boolean;
-  isIpad: boolean;
-  isIphone: boolean;
-  isMSWindows: boolean;
-}
-
-export interface IBufferAccessor {
-  buffer: IBuffer;
-}
-
-export interface IElementAccessor {
-  element: HTMLElement;
-}
-
-export interface ILinkifierAccessor {
-  linkifier: ILinkifier;
-}
-
-export interface ITerminal extends ILinkifierAccessor, IBufferAccessor, IElementAccessor, IEventEmitter {
-  selectionManager: ISelectionManager;
-  charMeasure: ICharMeasure;
-  textarea: HTMLTextAreaElement;
-  renderer: IRenderer;
-  rows: number;
-  cols: number;
-  browser: IBrowser;
-  writeBuffer: string[];
-  cursorHidden: boolean;
-  cursorState: number;
-  defAttr: number;
-  options: ITerminalOptions;
-  buffers: IBufferSet;
-  isFocused: boolean;
-  mouseHelper: IMouseHelper;
-  bracketedPasteMode: boolean;
-
-  /**
-   * Emit the 'data' event and populate the given data.
-   * @param data The data to populate in the event.
-   */
-  handler(data: string): void;
-  scrollLines(disp: number, suppressScrollEvent?: boolean): void;
-  cancel(ev: Event, force?: boolean): boolean | void;
-  log(text: string): void;
-  reset(): void;
-  showCursor(): void;
-  blankLine(cur?: boolean, isWrapped?: boolean, cols?: number): LineData;
-  refresh(start: number, end: number): void;
-}
-
-/**
- * This interface encapsulates everything needed from the Terminal by the
- * InputHandler. This cleanly separates the large amount of methods needed by
- * InputHandler cleanly from the ITerminal interface.
- */
-export interface IInputHandlingTerminal extends IEventEmitter {
-  element: HTMLElement;
-  options: ITerminalOptions;
-  cols: number;
-  rows: number;
-  charset: ICharset;
-  gcharset: number;
-  glevel: number;
-  charsets: ICharset[];
-  applicationKeypad: boolean;
-  applicationCursor: boolean;
-  originMode: boolean;
-  insertMode: boolean;
-  wraparoundMode: boolean;
-  bracketedPasteMode: boolean;
-  defAttr: number;
-  curAttr: number;
-  prefix: string;
-  savedCols: number;
-  x10Mouse: boolean;
-  vt200Mouse: boolean;
-  normalMouse: boolean;
-  mouseEvents: boolean;
-  sendFocus: boolean;
-  utfMouse: boolean;
-  sgrMouse: boolean;
-  urxvtMouse: boolean;
-  cursorHidden: boolean;
-
-  buffers: IBufferSet;
-  buffer: IBuffer;
-  viewport: IViewport;
-  selectionManager: ISelectionManager;
-
-  bell(): void;
-  focus(): void;
-  convertEol: boolean;
-  updateRange(y: number): void;
-  scroll(isWrapped?: boolean): void;
-  setgLevel(g: number): void;
-  eraseAttr(): number;
-  eraseRight(x: number, y: number): void;
-  eraseLine(y: number): void;
-  eraseLeft(x: number, y: number): void;
-  blankLine(cur?: boolean, isWrapped?: boolean): LineData;
-  is(term: string): boolean;
-  send(data: string): void;
-  setgCharset(g: number, charset: ICharset): void;
-  resize(x: number, y: number): void;
-  log(text: string, data?: any): void;
-  reset(): void;
-  showCursor(): void;
-  refresh(start: number, end: number): void;
-  matchColor(r1: number, g1: number, b1: number): number;
-  error(text: string, data?: any): void;
-  setOption(key: string, value: any): void;
-}
-
-export interface ITerminalOptions {
-  bellSound?: string;
-  bellStyle?: string;
-  cancelEvents?: boolean;
-  cols?: number;
-  convertEol?: boolean;
-  cursorBlink?: boolean;
-  cursorStyle?: string;
-  debug?: boolean;
-  disableStdin?: boolean;
-  enableBold?: boolean;
-  fontSize?: number;
-  fontFamily?: string;
-  fontWeight?: FontWeight;
-  fontWeightBold?: FontWeight;
-  handler?: (data: string) => void;
-  letterSpacing?: number;
-  lineHeight?: number;
-  macOptionIsMeta?: boolean;
-  rows?: number;
-  screenKeys?: boolean;
-  scrollback?: number;
-  tabStopWidth?: number;
-  termName?: string;
-  theme?: ITheme;
-  useFlowControl?: boolean;
-}
-
-export interface IBuffer {
-  lines: ICircularList<LineData>;
-  ydisp: number;
-  ybase: number;
-  y: number;
-  x: number;
-  tabs: any;
-  scrollBottom: number;
-  scrollTop: number;
-  savedY: number;
-  savedX: number;
-  isCursorInViewport: boolean;
-  translateBufferLineToString(lineIndex: number, trimRight: boolean, startCol?: number, endCol?: number): string;
-  nextStop(x?: number): number;
-  prevStop(x?: number): number;
-}
-
-export interface IBufferSet extends IEventEmitter {
-  alt: IBuffer;
-  normal: IBuffer;
-  active: IBuffer;
-
-  activateNormalBuffer(): void;
-  activateAltBuffer(): void;
-}
-
-export interface IMouseHelper {
-  getCoords(event: {pageX: number, pageY: number}, element: HTMLElement, charMeasure: ICharMeasure, lineHeight: number, colCount: number, rowCount: number, isSelection?: boolean): [number, number];
-  getRawByteCoords(event: MouseEvent, element: HTMLElement, charMeasure: ICharMeasure, lineHeight: number, colCount: number, rowCount: number): { x: number, y: number };
-}
-
-export interface IViewport {
-  syncScrollArea(): void;
-  onWheel(ev: WheelEvent): void;
-  onTouchStart(ev: TouchEvent): void;
-  onTouchMove(ev: TouchEvent): void;
-  onThemeChanged(colors: IColorSet): void;
-}
-
-export interface ISelectionManager {
-  selectionText: string;
-  selectionStart: [number, number];
-  selectionEnd: [number, number];
-
-  disable(): void;
-  enable(): void;
-  setSelection(row: number, col: number, length: number): void;
-}
-
-export interface ICompositionHelper {
-  compositionstart(): void;
-  compositionupdate(ev: CompositionEvent): void;
-  compositionend(): void;
-  updateCompositionElements(dontRecurse?: boolean): void;
-  keydown(ev: KeyboardEvent): boolean;
-}
-
-export interface ICharMeasure {
-  width: number;
-  height: number;
-  measure(options: ITerminalOptions): void;
-}
-
-export interface ILinkifier extends IEventEmitter {
-  attachToDom(mouseZoneManager: IMouseZoneManager): void;
-  linkifyRows(start: number, end: number): void;
-  setHypertextLinkHandler(handler: LinkMatcherHandler): void;
-  setHypertextValidationCallback(callback: LinkMatcherValidationCallback): void;
-  registerLinkMatcher(regex: RegExp, handler: LinkMatcherHandler, options?: ILinkMatcherOptions): number;
-  deregisterLinkMatcher(matcherId: number): boolean;
-}
-
-export interface ICircularList<T> extends IEventEmitter {
-  length: number;
-  maxLength: number;
-  forEach: (callbackfn: (value: T, index: number) => void) => void;
-
-  get(index: number): T;
-  set(index: number, value: T): void;
-  push(value: T): void;
-  pop(): T;
-  splice(start: number, deleteCount: number, ...items: T[]): void;
-  trimStart(count: number): void;
-  shiftElements(start: number, count: number, offset: number): void;
-}
-
-export interface IEventEmitter {
-  on(type: string, listener: IListenerType): void;
-  off(type: string, listener: IListenerType): void;
-  emit(type: string, data?: any): void;
-}
-
-export interface IListenerType {
-    (data?: any): void;
-    listener?: (data?: any) => void;
-}
-
-export interface ILinkMatcherOptions {
-  /**
-   * The index of the link from the regex.match(text) call. This defaults to 0
-   * (for regular expressions without capture groups).
-   */
-  matchIndex?: number;
-  /**
-   * A callback that validates an individual link, returning true if valid and
-   * false if invalid.
-   */
-  validationCallback?: LinkMatcherValidationCallback;
-  /**
-   * A callback that fires when the mouse hovers over a link.
-   */
-  tooltipCallback?: LinkMatcherHandler;
-  /**
-   * A callback that fires when the mouse leaves a link that was hovered.
-   */
-  leaveCallback?: () => void;
-  /**
-   * The priority of the link matcher, this defines the order in which the link
-   * matcher is evaluated relative to others, from highest to lowest. The
-   * default value is 0.
-   */
-  priority?: number;
-}
-
-/**
- * Handles actions generated by the parser.
- */
-export interface IInputHandler {
-  addChar(char: string, code: number): void;
-
-  /** C0 BEL */ bell(): void;
-  /** C0 LF */ lineFeed(): void;
-  /** C0 CR */ carriageReturn(): void;
-  /** C0 BS */ backspace(): void;
-  /** C0 HT */ tab(): void;
-  /** C0 SO */ shiftOut(): void;
-  /** C0 SI */ shiftIn(): void;
-
-  /** CSI @ */ insertChars(params?: number[]): void;
-  /** CSI A */ cursorUp(params?: number[]): void;
-  /** CSI B */ cursorDown(params?: number[]): void;
-  /** CSI C */ cursorForward(params?: number[]): void;
-  /** CSI D */ cursorBackward(params?: number[]): void;
-  /** CSI E */ cursorNextLine(params?: number[]): void;
-  /** CSI F */ cursorPrecedingLine(params?: number[]): void;
-  /** CSI G */ cursorCharAbsolute(params?: number[]): void;
-  /** CSI H */ cursorPosition(params?: number[]): void;
-  /** CSI I */ cursorForwardTab(params?: number[]): void;
-  /** CSI J */ eraseInDisplay(params?: number[]): void;
-  /** CSI K */ eraseInLine(params?: number[]): void;
-  /** CSI L */ insertLines(params?: number[]): void;
-  /** CSI M */ deleteLines(params?: number[]): void;
-  /** CSI P */ deleteChars(params?: number[]): void;
-  /** CSI S */ scrollUp(params?: number[]): void;
-  /** CSI T */ scrollDown(params?: number[]): void;
-  /** CSI X */ eraseChars(params?: number[]): void;
-  /** CSI Z */ cursorBackwardTab(params?: number[]): void;
-  /** CSI ` */ charPosAbsolute(params?: number[]): void;
-  /** CSI a */ HPositionRelative(params?: number[]): void;
-  /** CSI b */ repeatPrecedingCharacter(params?: number[]): void;
-  /** CSI c */ sendDeviceAttributes(params?: number[]): void;
-  /** CSI d */ linePosAbsolute(params?: number[]): void;
-  /** CSI e */ VPositionRelative(params?: number[]): void;
-  /** CSI f */ HVPosition(params?: number[]): void;
-  /** CSI g */ tabClear(params?: number[]): void;
-  /** CSI h */ setMode(params?: number[]): void;
-  /** CSI l */ resetMode(params?: number[]): void;
-  /** CSI m */ charAttributes(params?: number[]): void;
-  /** CSI n */ deviceStatus(params?: number[]): void;
-  /** CSI p */ softReset(params?: number[]): void;
-  /** CSI q */ setCursorStyle(params?: number[]): void;
-  /** CSI r */ setScrollRegion(params?: number[]): void;
-  /** CSI s */ saveCursor(params?: number[]): void;
-  /** CSI u */ restoreCursor(params?: number[]): void;
-}
-
-export interface ITheme {
-  foreground?: string;
-  background?: string;
-  cursor?: string;
-  cursorAccent?: string;
-  selection?: string;
-  black?: string;
-  red?: string;
-  green?: string;
-  yellow?: string;
-  blue?: string;
-  magenta?: string;
-  cyan?: string;
-  white?: string;
-  brightBlack?: string;
-  brightRed?: string;
-  brightGreen?: string;
-  brightYellow?: string;
-  brightBlue?: string;
-  brightMagenta?: string;
-  brightCyan?: string;
-  brightWhite?: string;
-}
-
-export interface ILinkMatcher {
-  id: number;
-  regex: RegExp;
-  handler: LinkMatcherHandler;
-  hoverTooltipCallback?: LinkMatcherHandler;
-  hoverLeaveCallback?: () => void;
-  matchIndex?: number;
-  validationCallback?: LinkMatcherValidationCallback;
-  priority?: number;
-}
-
-export interface ICharset {
-  [key: string]: string;
-}
-
-export interface ILinkHoverEvent {
-  x: number;
-  y: number;
-  length: number;
-}
diff --git a/src/Linkifier.test.ts b/src/Linkifier.test.ts
index 8b66dcaa5..14b1ac0f2 100644
--- a/src/Linkifier.test.ts
+++ b/src/Linkifier.test.ts
@@ -4,10 +4,9 @@
  */
 
 import { assert } from 'chai';
-import { ITerminal, ILinkifier, ILinkMatcher, IBuffer, IBufferAccessor, IElementAccessor } from './Interfaces';
+import { IMouseZoneManager, IMouseZone } from './input/Types';
+import { ILinkMatcher, LineData, ITerminal, ILinkifier, IBuffer, IBufferAccessor, IElementAccessor } from './Types';
 import { Linkifier } from './Linkifier';
-import { LineData } from './Types';
-import { IMouseZoneManager, IMouseZone } from './input/Interfaces';
 import { MockBuffer } from './utils/TestUtils.test';
 import { CircularList } from './utils/CircularList';
 
diff --git a/src/Linkifier.ts b/src/Linkifier.ts
index b5f30b562..da901a6ed 100644
--- a/src/Linkifier.ts
+++ b/src/Linkifier.ts
@@ -3,9 +3,8 @@
  * @license MIT
  */
 
-import { ILinkHoverEvent, ILinkMatcher, ILinkMatcherOptions, ITerminal, IBufferAccessor, ILinkifier, IElementAccessor } from './Interfaces';
-import { LinkMatcherHandler, LinkMatcherValidationCallback, LineData, LinkHoverEventTypes } from './Types';
-import { IMouseZoneManager } from './input/Interfaces';
+import { IMouseZoneManager } from './input/Types';
+import { ILinkHoverEvent, ILinkMatcher, LinkMatcherHandler, LinkMatcherValidationCallback, LineData, LinkHoverEventTypes, ILinkMatcherOptions, ITerminal, IBufferAccessor, ILinkifier, IElementAccessor } from './Types';
 import { MouseZone } from './input/MouseZoneManager';
 import { EventEmitter } from './EventEmitter';
 
diff --git a/src/Parser.ts b/src/Parser.ts
index 6f4b0932c..3ac03e4fb 100644
--- a/src/Parser.ts
+++ b/src/Parser.ts
@@ -5,7 +5,7 @@
  */
 
 import { C0 } from './EscapeSequences';
-import { IInputHandler } from './Interfaces';
+import { IInputHandler } from './Types';
 import { CHARSETS, DEFAULT_CHARSET } from './Charsets';
 
 const normalStateHandler: {[key: string]: (parser: Parser, handler: IInputHandler) => void} = {};
diff --git a/src/SelectionManager.test.ts b/src/SelectionManager.test.ts
index 97afcf2b7..5c53565fc 100644
--- a/src/SelectionManager.test.ts
+++ b/src/SelectionManager.test.ts
@@ -5,14 +5,13 @@
 
 import jsdom = require('jsdom');
 import { assert } from 'chai';
-import { ITerminal, ICircularList, IBuffer } from './Interfaces';
 import { CharMeasure } from './utils/CharMeasure';
 import { CircularList } from './utils/CircularList';
 import { SelectionManager } from './SelectionManager';
 import { SelectionModel } from './SelectionModel';
 import { BufferSet } from './BufferSet';
+import { LineData, CharData, ITerminal, ICircularList, IBuffer } from './Types';
 import { MockTerminal } from './utils/TestUtils.test';
-import { LineData, CharData } from './Types';
 
 class TestMockTerminal extends MockTerminal {
   emit(event: string, data: any): void {}
diff --git a/src/SelectionManager.ts b/src/SelectionManager.ts
index 608ca4124..10612c5c6 100644
--- a/src/SelectionManager.ts
+++ b/src/SelectionManager.ts
@@ -3,14 +3,13 @@
  * @license MIT
  */
 
+import { ITerminal, ICircularList, ISelectionManager, IBuffer, LineData, CharData } from './Types';
 import { MouseHelper } from './utils/MouseHelper';
-import * as Browser from './utils/Browser';
+import * as Browser from './shared/utils/Browser';
 import { CharMeasure } from './utils/CharMeasure';
 import { CircularList } from './utils/CircularList';
 import { EventEmitter } from './EventEmitter';
-import { ITerminal, ICircularList, ISelectionManager, IBuffer, IListenerType } from './Interfaces';
 import { SelectionModel } from './SelectionModel';
-import { LineData, CharData } from './Types';
 import { CHAR_DATA_WIDTH_INDEX, CHAR_DATA_CHAR_INDEX } from './Buffer';
 
 /**
@@ -95,7 +94,7 @@ export class SelectionManager extends EventEmitter implements ISelectionManager
 
   private _mouseMoveListener: EventListener;
   private _mouseUpListener: EventListener;
-  private _trimListener: IListenerType;
+  private _trimListener: (...args: any[]) => void;
 
   constructor(
     private _terminal: ITerminal,
diff --git a/src/SelectionModel.test.ts b/src/SelectionModel.test.ts
index eda947188..ed483dbe1 100644
--- a/src/SelectionModel.test.ts
+++ b/src/SelectionModel.test.ts
@@ -4,7 +4,7 @@
  */
 
 import { assert } from 'chai';
-import { ITerminal } from './Interfaces';
+import { ITerminal } from './Types';
 import { SelectionModel } from './SelectionModel';
 import { BufferSet } from './BufferSet';
 import { MockTerminal } from './utils/TestUtils.test';
diff --git a/src/SelectionModel.ts b/src/SelectionModel.ts
index 5982b1e91..a9a3c89eb 100644
--- a/src/SelectionModel.ts
+++ b/src/SelectionModel.ts
@@ -3,7 +3,7 @@
  * @license MIT
  */
 
-import { ITerminal } from './Interfaces';
+import { ITerminal } from './Types';
 
 /**
  * Represents a selection within the buffer. This model only cares about column
diff --git a/src/Terminal.ts b/src/Terminal.ts
index 70b7deaa0..5536cf03c 100644
--- a/src/Terminal.ts
+++ b/src/Terminal.ts
@@ -21,6 +21,9 @@
  *   http://linux.die.net/man/7/urxvt
  */
 
+import { ICharset, IInputHandlingTerminal, IViewport, ICompositionHelper, ITerminalOptions, ITerminal, IBrowser, ILinkifier, ILinkMatcherOptions, CustomKeyEventHandler, LinkMatcherHandler, LinkMatcherValidationCallback, CharData, LineData } from './Types';
+import { IMouseZoneManager } from './input/Types';
+import { IRenderer } from './renderer/Types';
 import { BufferSet } from './BufferSet';
 import { Buffer, MAX_BUFFER_SIZE } from './Buffer';
 import { CompositionHelper } from './CompositionHelper';
@@ -35,17 +38,13 @@ import { Renderer } from './renderer/Renderer';
 import { Linkifier } from './Linkifier';
 import { SelectionManager } from './SelectionManager';
 import { CharMeasure } from './utils/CharMeasure';
-import * as Browser from './utils/Browser';
+import * as Browser from './shared/utils/Browser';
 import { MouseHelper } from './utils/MouseHelper';
 import { CHARSETS } from './Charsets';
-import { CustomKeyEventHandler, LinkMatcherHandler, LinkMatcherValidationCallback, CharData, LineData } from './Types';
-import { ITerminal, IBrowser, ICharset, ITerminalOptions, IInputHandlingTerminal, ILinkMatcherOptions, IViewport, ICompositionHelper, ITheme, ILinkifier } from './Interfaces';
 import { BELL_SOUND } from './utils/Sounds';
 import { DEFAULT_ANSI_COLORS } from './renderer/ColorManager';
-import { IMouseZoneManager } from './input/Interfaces';
 import { MouseZoneManager } from './input/MouseZoneManager';
-import { initialize as initializeCharAtlas } from './renderer/CharAtlas';
-import { IRenderer } from './renderer/Interfaces';
+import { ITheme } from 'xterm';
 
 // Let it work inside Node.js for automated testing purposes.
 const document = (typeof window !== 'undefined') ? window.document : null;
@@ -591,8 +590,6 @@ export class Terminal extends EventEmitter implements ITerminal, IInputHandlingT
     this.document = this.parent.ownerDocument;
     this.body = <HTMLBodyElement>this.document.body;
 
-    initializeCharAtlas(this.document);
-
     // Create main element container
     this.element = this.document.createElement('div');
     this.element.classList.add('terminal');
@@ -2140,13 +2137,15 @@ export class Terminal extends EventEmitter implements ITerminal, IInputHandlingT
   }
 
   private visualBell(): boolean {
-    return this.options.bellStyle === 'visual' ||
-        this.options.bellStyle === 'both';
+    return false;
+    // return this.options.bellStyle === 'visual' ||
+    //     this.options.bellStyle === 'both';
   }
 
   private soundBell(): boolean {
-    return this.options.bellStyle === 'sound' ||
-        this.options.bellStyle === 'both';
+    return this.options.bellStyle === 'sound';
+    // return this.options.bellStyle === 'sound' ||
+    //     this.options.bellStyle === 'both';
   }
 
   private syncBellSound(): void {
diff --git a/src/Types.ts b/src/Types.ts
index 3c502b025..f3e9bb941 100644
--- a/src/Types.ts
+++ b/src/Types.ts
@@ -3,18 +3,332 @@
  * @license MIT
  */
 
-export type LinkMatcherHandler = (event: MouseEvent, uri: string) => boolean | void;
-export type LinkMatcherValidationCallback = (uri: string, callback: (isValid: boolean) => void) => void;
+import { Terminal as PublicTerminal, ITerminalOptions as IPublicTerminalOptions, IEventEmitter } from 'xterm';
+import { IColorSet, IRenderer } from './renderer/Types';
+import { IMouseZoneManager } from './input/Types';
 
 export type CustomKeyEventHandler = (event: KeyboardEvent) => boolean;
 
 export type CharData = [number, string, number, number];
 export type LineData = CharData[];
 
+export type LinkMatcherHandler = (event: MouseEvent, uri: string) => boolean | void;
+export type LinkMatcherValidationCallback = (uri: string, callback: (isValid: boolean) => void) => void;
+
 export enum LinkHoverEventTypes {
   HOVER = 'linkhover',
   TOOLTIP = 'linktooltip',
   LEAVE = 'linkleave'
 }
 
-export type FontWeight = 'normal' | 'bold' | '100' | '200' | '300' | '400' | '500' | '600' | '700' | '800' | '900';
+/**
+ * This interface encapsulates everything needed from the Terminal by the
+ * InputHandler. This cleanly separates the large amount of methods needed by
+ * InputHandler cleanly from the ITerminal interface.
+ */
+export interface IInputHandlingTerminal extends IEventEmitter {
+  element: HTMLElement;
+  options: ITerminalOptions;
+  cols: number;
+  rows: number;
+  charset: ICharset;
+  gcharset: number;
+  glevel: number;
+  charsets: ICharset[];
+  applicationKeypad: boolean;
+  applicationCursor: boolean;
+  originMode: boolean;
+  insertMode: boolean;
+  wraparoundMode: boolean;
+  bracketedPasteMode: boolean;
+  defAttr: number;
+  curAttr: number;
+  prefix: string;
+  savedCols: number;
+  x10Mouse: boolean;
+  vt200Mouse: boolean;
+  normalMouse: boolean;
+  mouseEvents: boolean;
+  sendFocus: boolean;
+  utfMouse: boolean;
+  sgrMouse: boolean;
+  urxvtMouse: boolean;
+  cursorHidden: boolean;
+
+  buffers: IBufferSet;
+  buffer: IBuffer;
+  viewport: IViewport;
+  selectionManager: ISelectionManager;
+
+  bell(): void;
+  focus(): void;
+  convertEol: boolean;
+  updateRange(y: number): void;
+  scroll(isWrapped?: boolean): void;
+  setgLevel(g: number): void;
+  eraseAttr(): number;
+  eraseRight(x: number, y: number): void;
+  eraseLine(y: number): void;
+  eraseLeft(x: number, y: number): void;
+  blankLine(cur?: boolean, isWrapped?: boolean): LineData;
+  is(term: string): boolean;
+  send(data: string): void;
+  setgCharset(g: number, charset: ICharset): void;
+  resize(x: number, y: number): void;
+  log(text: string, data?: any): void;
+  reset(): void;
+  showCursor(): void;
+  refresh(start: number, end: number): void;
+  matchColor(r1: number, g1: number, b1: number): number;
+  error(text: string, data?: any): void;
+  setOption(key: string, value: any): void;
+}
+
+export interface IViewport {
+  syncScrollArea(): void;
+  onWheel(ev: WheelEvent): void;
+  onTouchStart(ev: TouchEvent): void;
+  onTouchMove(ev: TouchEvent): void;
+  onThemeChanged(colors: IColorSet): void;
+}
+
+export interface ICompositionHelper {
+  compositionstart(): void;
+  compositionupdate(ev: CompositionEvent): void;
+  compositionend(): void;
+  updateCompositionElements(dontRecurse?: boolean): void;
+  keydown(ev: KeyboardEvent): boolean;
+}
+
+/**
+ * Handles actions generated by the parser.
+ */
+export interface IInputHandler {
+  addChar(char: string, code: number): void;
+
+  /** C0 BEL */ bell(): void;
+  /** C0 LF */ lineFeed(): void;
+  /** C0 CR */ carriageReturn(): void;
+  /** C0 BS */ backspace(): void;
+  /** C0 HT */ tab(): void;
+  /** C0 SO */ shiftOut(): void;
+  /** C0 SI */ shiftIn(): void;
+
+  /** CSI @ */ insertChars(params?: number[]): void;
+  /** CSI A */ cursorUp(params?: number[]): void;
+  /** CSI B */ cursorDown(params?: number[]): void;
+  /** CSI C */ cursorForward(params?: number[]): void;
+  /** CSI D */ cursorBackward(params?: number[]): void;
+  /** CSI E */ cursorNextLine(params?: number[]): void;
+  /** CSI F */ cursorPrecedingLine(params?: number[]): void;
+  /** CSI G */ cursorCharAbsolute(params?: number[]): void;
+  /** CSI H */ cursorPosition(params?: number[]): void;
+  /** CSI I */ cursorForwardTab(params?: number[]): void;
+  /** CSI J */ eraseInDisplay(params?: number[]): void;
+  /** CSI K */ eraseInLine(params?: number[]): void;
+  /** CSI L */ insertLines(params?: number[]): void;
+  /** CSI M */ deleteLines(params?: number[]): void;
+  /** CSI P */ deleteChars(params?: number[]): void;
+  /** CSI S */ scrollUp(params?: number[]): void;
+  /** CSI T */ scrollDown(params?: number[]): void;
+  /** CSI X */ eraseChars(params?: number[]): void;
+  /** CSI Z */ cursorBackwardTab(params?: number[]): void;
+  /** CSI ` */ charPosAbsolute(params?: number[]): void;
+  /** CSI a */ HPositionRelative(params?: number[]): void;
+  /** CSI b */ repeatPrecedingCharacter(params?: number[]): void;
+  /** CSI c */ sendDeviceAttributes(params?: number[]): void;
+  /** CSI d */ linePosAbsolute(params?: number[]): void;
+  /** CSI e */ VPositionRelative(params?: number[]): void;
+  /** CSI f */ HVPosition(params?: number[]): void;
+  /** CSI g */ tabClear(params?: number[]): void;
+  /** CSI h */ setMode(params?: number[]): void;
+  /** CSI l */ resetMode(params?: number[]): void;
+  /** CSI m */ charAttributes(params?: number[]): void;
+  /** CSI n */ deviceStatus(params?: number[]): void;
+  /** CSI p */ softReset(params?: number[]): void;
+  /** CSI q */ setCursorStyle(params?: number[]): void;
+  /** CSI r */ setScrollRegion(params?: number[]): void;
+  /** CSI s */ saveCursor(params?: number[]): void;
+  /** CSI u */ restoreCursor(params?: number[]): void;
+}
+
+export interface ILinkMatcher {
+  id: number;
+  regex: RegExp;
+  handler: LinkMatcherHandler;
+  hoverTooltipCallback?: LinkMatcherHandler;
+  hoverLeaveCallback?: () => void;
+  matchIndex?: number;
+  validationCallback?: LinkMatcherValidationCallback;
+  priority?: number;
+}
+
+export interface ICharset {
+  [key: string]: string;
+}
+
+export interface ILinkHoverEvent {
+  x: number;
+  y: number;
+  length: number;
+}
+
+export interface ITerminal extends PublicTerminal, IElementAccessor, IBufferAccessor, ILinkifierAccessor {
+  selectionManager: ISelectionManager;
+  charMeasure: ICharMeasure;
+  renderer: IRenderer;
+  browser: IBrowser;
+  writeBuffer: string[];
+  cursorHidden: boolean;
+  cursorState: number;
+  defAttr: number;
+  options: ITerminalOptions;
+  buffer: IBuffer;
+  buffers: IBufferSet;
+  isFocused: boolean;
+  mouseHelper: IMouseHelper;
+  bracketedPasteMode: boolean;
+
+  /**
+   * Emit the 'data' event and populate the given data.
+   * @param data The data to populate in the event.
+   */
+  handler(data: string): void;
+  scrollLines(disp: number, suppressScrollEvent?: boolean): void;
+  cancel(ev: Event, force?: boolean): boolean | void;
+  log(text: string): void;
+  showCursor(): void;
+  blankLine(cur?: boolean, isWrapped?: boolean, cols?: number): LineData;
+}
+
+export interface IBufferAccessor {
+  buffer: IBuffer;
+}
+
+export interface IElementAccessor {
+  element: HTMLElement;
+}
+
+export interface ILinkifierAccessor {
+  linkifier: ILinkifier;
+}
+
+export interface IMouseHelper {
+  getCoords(event: {pageX: number, pageY: number}, element: HTMLElement, charMeasure: ICharMeasure, lineHeight: number, colCount: number, rowCount: number, isSelection?: boolean): [number, number];
+  getRawByteCoords(event: MouseEvent, element: HTMLElement, charMeasure: ICharMeasure, lineHeight: number, colCount: number, rowCount: number): { x: number, y: number };
+}
+
+export interface ICharMeasure {
+  width: number;
+  height: number;
+  measure(options: ITerminalOptions): void;
+}
+
+// TODO: The options that are not in the public API should be reviewed
+export interface ITerminalOptions extends IPublicTerminalOptions {
+  cancelEvents?: boolean;
+  convertEol?: boolean;
+  debug?: boolean;
+  handler?: (data: string) => void;
+  screenKeys?: boolean;
+  termName?: string;
+  useFlowControl?: boolean;
+}
+
+export interface IBuffer {
+  lines: ICircularList<LineData>;
+  ydisp: number;
+  ybase: number;
+  y: number;
+  x: number;
+  tabs: any;
+  scrollBottom: number;
+  scrollTop: number;
+  savedY: number;
+  savedX: number;
+  isCursorInViewport: boolean;
+  translateBufferLineToString(lineIndex: number, trimRight: boolean, startCol?: number, endCol?: number): string;
+  nextStop(x?: number): number;
+  prevStop(x?: number): number;
+}
+
+export interface IBufferSet extends IEventEmitter {
+  alt: IBuffer;
+  normal: IBuffer;
+  active: IBuffer;
+
+  activateNormalBuffer(): void;
+  activateAltBuffer(): void;
+}
+
+export interface ICircularList<T> extends IEventEmitter {
+  length: number;
+  maxLength: number;
+  forEach: (callbackfn: (value: T, index: number) => void) => void;
+
+  get(index: number): T;
+  set(index: number, value: T): void;
+  push(value: T): void;
+  pop(): T;
+  splice(start: number, deleteCount: number, ...items: T[]): void;
+  trimStart(count: number): void;
+  shiftElements(start: number, count: number, offset: number): void;
+}
+
+export interface ISelectionManager {
+  selectionText: string;
+  selectionStart: [number, number];
+  selectionEnd: [number, number];
+
+  disable(): void;
+  enable(): void;
+  setSelection(row: number, col: number, length: number): void;
+}
+
+export interface ILinkifier extends IEventEmitter {
+  attachToDom(mouseZoneManager: IMouseZoneManager): void;
+  linkifyRows(start: number, end: number): void;
+  setHypertextLinkHandler(handler: LinkMatcherHandler): void;
+  setHypertextValidationCallback(callback: LinkMatcherValidationCallback): void;
+  registerLinkMatcher(regex: RegExp, handler: LinkMatcherHandler, options?: ILinkMatcherOptions): number;
+  deregisterLinkMatcher(matcherId: number): boolean;
+}
+
+export interface ILinkMatcherOptions {
+  /**
+   * The index of the link from the regex.match(text) call. This defaults to 0
+   * (for regular expressions without capture groups).
+   */
+  matchIndex?: number;
+  /**
+   * A callback that validates an individual link, returning true if valid and
+   * false if invalid.
+   */
+  validationCallback?: LinkMatcherValidationCallback;
+  /**
+   * A callback that fires when the mouse hovers over a link.
+   */
+  tooltipCallback?: LinkMatcherHandler;
+  /**
+   * A callback that fires when the mouse leaves a link that was hovered.
+   */
+  leaveCallback?: () => void;
+  /**
+   * The priority of the link matcher, this defines the order in which the link
+   * matcher is evaluated relative to others, from highest to lowest. The
+   * default value is 0.
+   */
+  priority?: number;
+}
+
+export interface IBrowser {
+  isNode: boolean;
+  userAgent: string;
+  platform: string;
+  isFirefox: boolean;
+  isMSIE: boolean;
+  isMac: boolean;
+  isIpad: boolean;
+  isIphone: boolean;
+  isMSWindows: boolean;
+}
diff --git a/src/Viewport.ts b/src/Viewport.ts
index fcac68ad4..87ecd69ec 100644
--- a/src/Viewport.ts
+++ b/src/Viewport.ts
@@ -3,9 +3,9 @@
  * @license MIT
  */
 
-import { ITerminal, IViewport } from './Interfaces';
+import { IColorSet } from './renderer/Types';
+import { ITerminal, IViewport } from './Types';
 import { CharMeasure } from './utils/CharMeasure';
-import { IColorSet } from './renderer/Interfaces';
 
 /**
  * Represents the viewport of a terminal, the visible area within the larger buffer of output.
diff --git a/src/handlers/Clipboard.ts b/src/handlers/Clipboard.ts
index cf6661fe2..fd2b3d779 100644
--- a/src/handlers/Clipboard.ts
+++ b/src/handlers/Clipboard.ts
@@ -3,7 +3,7 @@
  * @license MIT
  */
 
-import { ITerminal, ISelectionManager } from '../Interfaces';
+import { ITerminal, ISelectionManager } from '../Types';
 
 interface IWindow extends Window {
   clipboardData?: {
diff --git a/src/input/MouseZoneManager.ts b/src/input/MouseZoneManager.ts
index 6fbe1c673..98377f36c 100644
--- a/src/input/MouseZoneManager.ts
+++ b/src/input/MouseZoneManager.ts
@@ -3,8 +3,8 @@
  * @license MIT
  */
 
-import { IMouseZoneManager, IMouseZone } from './Interfaces';
-import { ITerminal } from '../Interfaces';
+import { ITerminal } from '../Types';
+import { IMouseZoneManager, IMouseZone } from './Types';
 
 const HOVER_DURATION = 500;
 
diff --git a/src/input/Interfaces.ts b/src/input/Types.ts
similarity index 100%
rename from src/input/Interfaces.ts
rename to src/input/Types.ts
diff --git a/src/renderer/BaseRenderLayer.ts b/src/renderer/BaseRenderLayer.ts
index bf952d06f..20a41cfa3 100644
--- a/src/renderer/BaseRenderLayer.ts
+++ b/src/renderer/BaseRenderLayer.ts
@@ -3,10 +3,9 @@
  * @license MIT
  */
 
-import { IRenderLayer, IColorSet, IRenderDimensions } from './Interfaces';
-import { ITerminal, ITerminalOptions } from '../Interfaces';
+import { IRenderLayer, IColorSet, IRenderDimensions } from './Types';
+import { CharData, ITerminal, ITerminalOptions } from '../Types';
 import { acquireCharAtlas, CHAR_ATLAS_CELL_SPACING } from './CharAtlas';
-import { CharData } from '../Types';
 import { CHAR_DATA_WIDTH_INDEX, CHAR_DATA_CHAR_INDEX } from '../Buffer';
 
 export const INVERTED_DEFAULT_COLOR = -1;
diff --git a/src/renderer/CharAtlas.ts b/src/renderer/CharAtlas.ts
index 1458ba762..05cf72014 100644
--- a/src/renderer/CharAtlas.ts
+++ b/src/renderer/CharAtlas.ts
@@ -3,9 +3,10 @@
  * @license MIT
  */
 
-import { ITerminal, ITheme } from '../Interfaces';
-import { IColorSet } from '../renderer/Interfaces';
-import { isFirefox } from '../utils/Browser';
+import { ITerminal } from '../Types';
+import { IColorSet } from './Types';
+import { isFirefox } from '../shared/utils/Browser';
+import { generateCharAtlas, ICharAtlasRequest } from '../shared/CharAtlasGenerator';
 
 export const CHAR_ATLAS_CELL_SPACING = 1;
 
@@ -65,8 +66,28 @@ export function acquireCharAtlas(terminal: ITerminal, colors: IColorSet, scaledC
     }
   }
 
+  const canvasFactory = (width: number, height: number) => {
+    const canvas = document.createElement('canvas');
+    canvas.width = width;
+    canvas.height = height;
+    return canvas;
+  };
+
+  const charAtlasConfig: ICharAtlasRequest = {
+    scaledCharWidth,
+    scaledCharHeight,
+    fontSize: terminal.options.fontSize,
+    fontFamily: terminal.options.fontFamily,
+    fontWeight: terminal.options.fontWeight,
+    fontWeightBold: terminal.options.fontWeightBold,
+    background: colors.background,
+    foreground: colors.foreground,
+    ansiColors: colors.ansi,
+    devicePixelRatio: window.devicePixelRatio
+  };
+
   const newEntry: ICharAtlasCacheEntry = {
-    bitmap: generator.generate(scaledCharWidth, scaledCharHeight, terminal.options.fontSize, terminal.options.fontFamily, terminal.options.fontWeight, terminal.options.fontWeightBold, colors.background, colors.foreground, colors.ansi),
+    bitmap: generateCharAtlas(window, canvasFactory, charAtlasConfig),
     config: newConfig,
     ownedBy: [terminal]
   };
@@ -109,124 +130,3 @@ function configEquals(a: ICharAtlasConfig, b: ICharAtlasConfig): boolean {
       a.colors.foreground === b.colors.foreground &&
       a.colors.background === b.colors.background;
 }
-
-let generator: CharAtlasGenerator;
-
-/**
- * Initializes the char atlas generator.
- * @param document The document.
- */
-export function initialize(document: Document): void {
-  if (!generator) {
-    generator = new CharAtlasGenerator(document);
-  }
-}
-
-class CharAtlasGenerator {
-  private _canvas: HTMLCanvasElement;
-  private _ctx: CanvasRenderingContext2D;
-
-  constructor(private _document: Document) {
-    this._canvas = this._document.createElement('canvas');
-    this._ctx = this._canvas.getContext('2d', {alpha: false});
-    this._ctx.scale(window.devicePixelRatio, window.devicePixelRatio);
-  }
-
-  public generate(scaledCharWidth: number, scaledCharHeight: number, fontSize: number, fontFamily: string, fontWeight: string, fontWeightBold: string, background: string, foreground: string, ansiColors: string[]): HTMLCanvasElement | Promise<ImageBitmap> {
-    const cellWidth = scaledCharWidth + CHAR_ATLAS_CELL_SPACING;
-    const cellHeight = scaledCharHeight + CHAR_ATLAS_CELL_SPACING;
-    this._canvas.width = 255 * cellWidth;
-    this._canvas.height = (/*default+default bold*/2 + /*0-15*/16) * cellHeight;
-
-    this._ctx.fillStyle = background;
-    this._ctx.fillRect(0, 0, this._canvas.width, this._canvas.height);
-
-    this._ctx.save();
-    this._ctx.fillStyle = foreground;
-    this._ctx.font = this._getFont(fontWeight, fontSize, fontFamily);
-    this._ctx.textBaseline = 'top';
-
-    // Default color
-    for (let i = 0; i < 256; i++) {
-      this._ctx.save();
-      this._ctx.beginPath();
-      this._ctx.rect(i * cellWidth, 0, cellWidth, cellHeight);
-      this._ctx.clip();
-      this._ctx.fillText(String.fromCharCode(i), i * cellWidth, 0);
-      this._ctx.restore();
-    }
-    // Default color bold
-    this._ctx.save();
-    this._ctx.font = this._getFont(fontWeightBold, fontSize, fontFamily);
-    for (let i = 0; i < 256; i++) {
-      this._ctx.save();
-      this._ctx.beginPath();
-      this._ctx.rect(i * cellWidth, cellHeight, cellWidth, cellHeight);
-      this._ctx.clip();
-      this._ctx.fillText(String.fromCharCode(i), i * cellWidth, cellHeight);
-      this._ctx.restore();
-    }
-    this._ctx.restore();
-
-    // Colors 0-15
-    this._ctx.font = this._getFont(fontWeight, fontSize, fontFamily);
-    for (let colorIndex = 0; colorIndex < 16; colorIndex++) {
-      // colors 8-15 are bold
-      if (colorIndex === 8) {
-        this._ctx.font = this._getFont(fontWeightBold, fontSize, fontFamily);
-      }
-      const y = (colorIndex + 2) * cellHeight;
-      // Draw ascii characters
-      for (let i = 0; i < 256; i++) {
-        this._ctx.save();
-        this._ctx.beginPath();
-        this._ctx.rect(i * cellWidth, y, cellWidth, cellHeight);
-        this._ctx.clip();
-        this._ctx.fillStyle = ansiColors[colorIndex];
-        this._ctx.fillText(String.fromCharCode(i), i * cellWidth, y);
-        this._ctx.restore();
-      }
-    }
-    this._ctx.restore();
-
-    // Support is patchy for createImageBitmap at the moment, pass a canvas back
-    // if support is lacking as drawImage works there too. Firefox is also
-    // included here as ImageBitmap appears both buggy and has horrible
-    // performance (tested on v55).
-    if (!('createImageBitmap' in window) || isFirefox) {
-      // Regenerate canvas and context as they are now owned by the char atlas
-      const result = this._canvas;
-      this._canvas = this._document.createElement('canvas');
-      this._ctx = this._canvas.getContext('2d');
-      this._ctx.scale(window.devicePixelRatio, window.devicePixelRatio);
-      return result;
-    }
-
-    const charAtlasImageData = this._ctx.getImageData(0, 0, this._canvas.width, this._canvas.height);
-
-    // Remove the background color from the image so characters may overlap
-    const r = parseInt(background.substr(1, 2), 16);
-    const g = parseInt(background.substr(3, 2), 16);
-    const b = parseInt(background.substr(5, 2), 16);
-    this._clearColor(charAtlasImageData, r, g, b);
-
-    const promise = window.createImageBitmap(charAtlasImageData);
-    // Clear the rect while the promise is in progress
-    this._ctx.clearRect(0, 0, this._canvas.width, this._canvas.height);
-    return promise;
-  }
-
-  private _clearColor(imageData: ImageData, r: number, g: number, b: number): void {
-    for (let offset = 0; offset < imageData.data.length; offset += 4) {
-      if (imageData.data[offset] === r &&
-          imageData.data[offset + 1] === g &&
-          imageData.data[offset + 2] === b) {
-        imageData.data[offset + 3] = 0;
-      }
-    }
-  }
-
-  private _getFont(fontWeight: string, fontSize: number, fontFamily: string): string {
-    return `${fontWeight} ${fontSize * window.devicePixelRatio}px ${fontFamily}`;
-  }
-}
diff --git a/src/renderer/ColorManager.ts b/src/renderer/ColorManager.ts
index 6c0d29454..b45c86469 100644
--- a/src/renderer/ColorManager.ts
+++ b/src/renderer/ColorManager.ts
@@ -3,8 +3,8 @@
  * @license MIT
  */
 
-import { IColorSet, IColorManager } from './Interfaces';
-import { ITheme } from '../Interfaces';
+import { IColorSet, IColorManager } from './Types';
+import { ITheme } from 'xterm';
 
 const DEFAULT_FOREGROUND = '#ffffff';
 const DEFAULT_BACKGROUND = '#000000';
diff --git a/src/renderer/CursorRenderLayer.ts b/src/renderer/CursorRenderLayer.ts
index 6ac489fcc..d430b81d6 100644
--- a/src/renderer/CursorRenderLayer.ts
+++ b/src/renderer/CursorRenderLayer.ts
@@ -3,13 +3,11 @@
  * @license MIT
  */
 
-import { IColorSet, IRenderDimensions } from './Interfaces';
-import { IBuffer, ICharMeasure, ITerminal, ITerminalOptions } from '../Interfaces';
 import { CHAR_DATA_WIDTH_INDEX, CHAR_DATA_CODE_INDEX, CHAR_DATA_CHAR_INDEX } from '../Buffer';
 import { GridCache } from './GridCache';
-import { FLAGS } from './Types';
+import { FLAGS, IColorSet, IRenderDimensions } from './Types';
 import { BaseRenderLayer } from './BaseRenderLayer';
-import { CharData } from '../Types';
+import { CharData, IBuffer, ICharMeasure, ITerminal, ITerminalOptions } from '../Types';
 
 interface ICursorState {
   x: number;
diff --git a/src/renderer/Interfaces.ts b/src/renderer/Interfaces.ts
deleted file mode 100644
index be1b39dd1..000000000
--- a/src/renderer/Interfaces.ts
+++ /dev/null
@@ -1,99 +0,0 @@
-/**
- * Copyright (c) 2017 The xterm.js authors. All rights reserved.
- * @license MIT
- */
-
-import { ITerminal, ITerminalOptions, ITheme, IEventEmitter } from '../Interfaces';
-
-export interface IRenderer extends IEventEmitter {
-  dimensions: IRenderDimensions;
-  colorManager: IColorManager;
-
-  setTheme(theme: ITheme): IColorSet;
-  onWindowResize(devicePixelRatio: number): void;
-  onResize(cols: number, rows: number, didCharSizeChange: boolean): void;
-  onCharSizeChanged(): void;
-  onBlur(): void;
-  onFocus(): void;
-  onSelectionChanged(start: [number, number], end: [number, number]): void;
-  onCursorMove(): void;
-  onOptionsChanged(): void;
-  clear(): void;
-  queueRefresh(start: number, end: number): void;
-}
-
-export interface IRenderLayer {
-  /**
-   * Called when the terminal loses focus.
-   */
-  onBlur(terminal: ITerminal): void;
-
-  /**
-   * * Called when the terminal gets focus.
-   */
-  onFocus(terminal: ITerminal): void;
-
-  /**
-   * Called when the cursor is moved.
-   */
-  onCursorMove(terminal: ITerminal): void;
-
-  /**
-   * Called when options change.
-   */
-  onOptionsChanged(terminal: ITerminal): void;
-
-  /**
-   * Called when the theme changes.
-   */
-  onThemeChanged(terminal: ITerminal, colorSet: IColorSet): void;
-
-  /**
-   * Called when the data in the grid has changed (or needs to be rendered
-   * again).
-   */
-  onGridChanged(terminal: ITerminal, startRow: number, endRow: number): void;
-
-  /**
-   * Calls when the selection changes.
-   */
-  onSelectionChanged(terminal: ITerminal, start: [number, number], end: [number, number]): void;
-
-  /**
-   * Resize the render layer.
-   */
-  resize(terminal: ITerminal, dim: IRenderDimensions, charSizeChanged: boolean): void;
-
-  /**
-   * Clear the state of the render layer.
-   */
-  reset(terminal: ITerminal): void;
-}
-
-export interface IColorManager {
-  colors: IColorSet;
-}
-
-export interface IColorSet {
-  foreground: string;
-  background: string;
-  cursor: string;
-  cursorAccent: string;
-  selection: string;
-  ansi: string[];
-}
-
-export interface IRenderDimensions {
-  scaledCharWidth: number;
-  scaledCharHeight: number;
-  scaledCellWidth: number;
-  scaledCellHeight: number;
-  scaledCharLeft: number;
-  scaledCharTop: number;
-  scaledCanvasWidth: number;
-  scaledCanvasHeight: number;
-  canvasWidth: number;
-  canvasHeight: number;
-  actualCellWidth: number;
-  actualCellHeight: number;
-}
diff --git a/src/renderer/LinkRenderLayer.ts b/src/renderer/LinkRenderLayer.ts
index 87fbddbdf..61352f154 100644
--- a/src/renderer/LinkRenderLayer.ts
+++ b/src/renderer/LinkRenderLayer.ts
@@ -3,13 +3,11 @@
  * @license MIT
  */
 
-import { IColorSet, IRenderDimensions } from './Interfaces';
-import { IBuffer, ICharMeasure, ILinkHoverEvent, ITerminal, ILinkifierAccessor } from '../Interfaces';
+import { ILinkHoverEvent, ITerminal, ILinkifierAccessor, IBuffer, ICharMeasure, LinkHoverEventTypes } from '../Types';
 import { CHAR_DATA_ATTR_INDEX } from '../Buffer';
 import { GridCache } from './GridCache';
-import { FLAGS } from './Types';
+import { FLAGS, IColorSet, IRenderDimensions } from './Types';
 import { BaseRenderLayer, INVERTED_DEFAULT_COLOR } from './BaseRenderLayer';
-import { LinkHoverEventTypes } from '../Types';
 
 export class LinkRenderLayer extends BaseRenderLayer {
   private _state: ILinkHoverEvent = null;
diff --git a/src/renderer/Renderer.ts b/src/renderer/Renderer.ts
index 680d9490f..8b9f5006e 100644
--- a/src/renderer/Renderer.ts
+++ b/src/renderer/Renderer.ts
@@ -3,17 +3,18 @@
  * @license MIT
  */
 
-import { ITerminal, ITheme } from '../Interfaces';
 import { CHAR_DATA_WIDTH_INDEX, CHAR_DATA_CHAR_INDEX } from '../Buffer';
 import { TextRenderLayer } from './TextRenderLayer';
 import { SelectionRenderLayer } from './SelectionRenderLayer';
 import { CursorRenderLayer } from './CursorRenderLayer';
 import { ColorManager } from './ColorManager';
 import { BaseRenderLayer } from './BaseRenderLayer';
-import { IRenderLayer, IColorSet, IRenderer, IRenderDimensions } from './Interfaces';
+import { IRenderLayer, IColorSet, IRenderer, IRenderDimensions } from './Types';
+import { ITerminal } from '../Types';
 import { LinkRenderLayer } from './LinkRenderLayer';
 import { EventEmitter } from '../EventEmitter';
 import { ScreenDprMonitor } from '../utils/ScreenDprMonitor';
+import { ITheme } from 'xterm';
 
 export class Renderer extends EventEmitter implements IRenderer {
   /** A queue of the rows to be refreshed */
diff --git a/src/renderer/SelectionRenderLayer.ts b/src/renderer/SelectionRenderLayer.ts
index 9740bb9a6..53fc9b39d 100644
--- a/src/renderer/SelectionRenderLayer.ts
+++ b/src/renderer/SelectionRenderLayer.ts
@@ -3,11 +3,10 @@
  * @license MIT
  */
 
-import { IColorSet, IRenderDimensions } from './Interfaces';
-import { IBuffer, ICharMeasure, ITerminal } from '../Interfaces';
+import { IBuffer, ICharMeasure, ITerminal } from '../Types';
 import { CHAR_DATA_ATTR_INDEX } from '../Buffer';
 import { GridCache } from './GridCache';
-import { FLAGS } from './Types';
+import { FLAGS, IColorSet, IRenderDimensions } from './Types';
 import { BaseRenderLayer } from './BaseRenderLayer';
 
 export class SelectionRenderLayer extends BaseRenderLayer {
diff --git a/src/renderer/TextRenderLayer.ts b/src/renderer/TextRenderLayer.ts
index 141d9823e..3c01cea3b 100644
--- a/src/renderer/TextRenderLayer.ts
+++ b/src/renderer/TextRenderLayer.ts
@@ -3,12 +3,10 @@
  * @license MIT
  */
 
-import { IColorSet, IRenderDimensions } from './Interfaces';
-import { IBuffer, ICharMeasure, ITerminal } from '../Interfaces';
 import { CHAR_DATA_ATTR_INDEX, CHAR_DATA_CODE_INDEX, CHAR_DATA_CHAR_INDEX, CHAR_DATA_WIDTH_INDEX } from '../Buffer';
-import { FLAGS } from './Types';
+import { FLAGS, IColorSet, IRenderDimensions } from './Types';
+import { CharData, IBuffer, ICharMeasure, ITerminal } from '../Types';
 import { GridCache } from './GridCache';
-import { CharData } from '../Types';
 import { BaseRenderLayer, INVERTED_DEFAULT_COLOR } from './BaseRenderLayer';
 
 /**
diff --git a/src/renderer/Types.ts b/src/renderer/Types.ts
index 834f88135..52c06e045 100644
--- a/src/renderer/Types.ts
+++ b/src/renderer/Types.ts
@@ -3,7 +3,10 @@
  * @license MIT
  */
 
- /**
+import { ITerminal } from '../Types';
+import { IEventEmitter, ITheme } from 'xterm';
+
+/**
  * Flags used to render terminal text properly.
  */
 export enum FLAGS {
@@ -14,3 +17,96 @@ export enum FLAGS {
   INVISIBLE = 16,
   DIM = 32
 }
+
+export interface IRenderer extends IEventEmitter {
+  dimensions: IRenderDimensions;
+  colorManager: IColorManager;
+
+  setTheme(theme: ITheme): IColorSet;
+  onWindowResize(devicePixelRatio: number): void;
+  onResize(cols: number, rows: number, didCharSizeChange: boolean): void;
+  onCharSizeChanged(): void;
+  onBlur(): void;
+  onFocus(): void;
+  onSelectionChanged(start: [number, number], end: [number, number]): void;
+  onCursorMove(): void;
+  onOptionsChanged(): void;
+  clear(): void;
+  queueRefresh(start: number, end: number): void;
+}
+
+export interface IColorManager {
+  colors: IColorSet;
+}
+
+export interface IColorSet {
+  foreground: string;
+  background: string;
+  cursor: string;
+  cursorAccent: string;
+  selection: string;
+  ansi: string[];
+}
+
+export interface IRenderDimensions {
+  scaledCharWidth: number;
+  scaledCharHeight: number;
+  scaledCellWidth: number;
+  scaledCellHeight: number;
+  scaledCharLeft: number;
+  scaledCharTop: number;
+  scaledCanvasWidth: number;
+  scaledCanvasHeight: number;
+  canvasWidth: number;
+  canvasHeight: number;
+  actualCellWidth: number;
+  actualCellHeight: number;
+}
+
+export interface IRenderLayer {
+  /**
+   * Called when the terminal loses focus.
+   */
+  onBlur(terminal: ITerminal): void;
+
+  /**
+   * * Called when the terminal gets focus.
+   */
+  onFocus(terminal: ITerminal): void;
+
+  /**
+   * Called when the cursor is moved.
+   */
+  onCursorMove(terminal: ITerminal): void;
+
+  /**
+   * Called when options change.
+   */
+  onOptionsChanged(terminal: ITerminal): void;
+
+  /**
+   * Called when the theme changes.
+   */
+  onThemeChanged(terminal: ITerminal, colorSet: IColorSet): void;
+
+  /**
+   * Called when the data in the grid has changed (or needs to be rendered
+   * again).
+   */
+  onGridChanged(terminal: ITerminal, startRow: number, endRow: number): void;
+
+  /**
+   * Calls when the selection changes.
+   */
+  onSelectionChanged(terminal: ITerminal, start: [number, number], end: [number, number]): void;
+
+  /**
+   * Resize the render layer.
+   */
+  resize(terminal: ITerminal, dim: IRenderDimensions, charSizeChanged: boolean): void;
+
+  /**
+   * Clear the state of the render layer.
+   */
+  reset(terminal: ITerminal): void;
+}
diff --git a/src/shared/CharAtlasGenerator.ts b/src/shared/CharAtlasGenerator.ts
new file mode 100644
index 000000000..9ae9f4b31
--- /dev/null
+++ b/src/shared/CharAtlasGenerator.ts
@@ -0,0 +1,140 @@
+/**
+ * Copyright (c) 2018 The xterm.js authors. All rights reserved.
+ * @license MIT
+ */
+
+import { FontWeight } from 'xterm';
+import { isFirefox } from './utils/Browser';
+
+declare const Promise: any;
+
+export interface IOffscreenCanvas {
+  width: number;
+  height: number;
+  getContext(type: '2d', config?: Canvas2DContextAttributes): CanvasRenderingContext2D;
+  transferToImageBitmap(): ImageBitmap;
+}
+
+export interface ICharAtlasRequest {
+  scaledCharWidth: number;
+  scaledCharHeight: number;
+  fontSize: number;
+  fontFamily: string;
+  fontWeight: FontWeight;
+  fontWeightBold: FontWeight;
+  background: string;
+  foreground: string;
+  ansiColors: string[];
+  devicePixelRatio: number;
+}
+
+export const CHAR_ATLAS_CELL_SPACING = 1;
+
+/**
+ * Generates a char atlas.
+ * @param context The window or worker context.
+ * @param canvasFactory A function to generate a canvas with a width or height.
+ * @param request The config for the new char atlas.
+ */
+export function generateCharAtlas(context: Window, canvasFactory: (width: number, height: number) => HTMLCanvasElement | IOffscreenCanvas, request: ICharAtlasRequest): HTMLCanvasElement | Promise<ImageBitmap> {
+  const cellWidth = request.scaledCharWidth + CHAR_ATLAS_CELL_SPACING;
+  const cellHeight = request.scaledCharHeight + CHAR_ATLAS_CELL_SPACING;
+  const canvas = canvasFactory(
+    /*255 ascii chars*/255 * cellWidth,
+    (/*default+default bold*/2 + /*0-15*/16) * cellHeight
+  );
+  const ctx = canvas.getContext('2d', {alpha: false});
+
+  ctx.fillStyle = request.background;
+  ctx.fillRect(0, 0, canvas.width, canvas.height);
+
+  ctx.save();
+  ctx.fillStyle = request.foreground;
+  ctx.font = getFont(request.fontWeight, request);
+  ctx.textBaseline = 'top';
+
+  // Default color
+  for (let i = 0; i < 256; i++) {
+    ctx.save();
+    ctx.beginPath();
+    ctx.rect(i * cellWidth, 0, cellWidth, cellHeight);
+    ctx.clip();
+    ctx.fillText(String.fromCharCode(i), i * cellWidth, 0);
+    ctx.restore();
+  }
+  // Default color bold
+  ctx.save();
+  ctx.font = getFont(request.fontWeightBold, request);
+  for (let i = 0; i < 256; i++) {
+    ctx.save();
+    ctx.beginPath();
+    ctx.rect(i * cellWidth, cellHeight, cellWidth, cellHeight);
+    ctx.clip();
+    ctx.fillText(String.fromCharCode(i), i * cellWidth, cellHeight);
+    ctx.restore();
+  }
+  ctx.restore();
+
+  // Colors 0-15
+  ctx.font = getFont(request.fontWeight, request);
+  for (let colorIndex = 0; colorIndex < 16; colorIndex++) {
+    // colors 8-15 are bold
+    if (colorIndex === 8) {
+      ctx.font = getFont(request.fontWeightBold, request);
+    }
+    const y = (colorIndex + 2) * cellHeight;
+    // Draw ascii characters
+    for (let i = 0; i < 256; i++) {
+      ctx.save();
+      ctx.beginPath();
+      ctx.rect(i * cellWidth, y, cellWidth, cellHeight);
+      ctx.clip();
+      ctx.fillStyle = request.ansiColors[colorIndex];
+      ctx.fillText(String.fromCharCode(i), i * cellWidth, y);
+      ctx.restore();
+    }
+  }
+  ctx.restore();
+
+  // Support is patchy for createImageBitmap at the moment, pass a canvas back
+  // if support is lacking as drawImage works there too. Firefox is also
+  // included here as ImageBitmap appears both buggy and has horrible
+  // performance (tested on v55).
+  if (!('createImageBitmap' in context) || isFirefox) {
+    // Don't attempt to clear background colors if createImageBitmap is not supported
+    if (canvas instanceof HTMLCanvasElement) {
+      // Just return the HTMLCanvas if it's a HTMLCanvasElement
+      return canvas;
+    } else {
+      // Transfer to an ImageBitmap is this is an OffscreenCanvas
+      return new Promise(r => r(canvas.transferToImageBitmap()));
+    }
+  }
+
+  const charAtlasImageData = ctx.getImageData(0, 0, canvas.width, canvas.height);
+
+  // Remove the background color from the image so characters may overlap
+  const r = parseInt(request.background.substr(1, 2), 16);
+  const g = parseInt(request.background.substr(3, 2), 16);
+  const b = parseInt(request.background.substr(5, 2), 16);
+  clearColor(charAtlasImageData, r, g, b);
+
+  return context.createImageBitmap(charAtlasImageData);
+}
+
+/**
+ * Makes a partiicular rgb color in an ImageData completely transparent.
+ */
+function clearColor(imageData: ImageData, r: number, g: number, b: number): void {
+  for (let offset = 0; offset < imageData.data.length; offset += 4) {
+    if (imageData.data[offset] === r &&
+        imageData.data[offset + 1] === g &&
+        imageData.data[offset + 2] === b) {
+      imageData.data[offset + 3] = 0;
+    }
+  }
+}
+
+function getFont(fontWeight: FontWeight, request: ICharAtlasRequest): string {
+  return `${fontWeight} ${request.fontSize * request.devicePixelRatio}px ${request.fontFamily}`;
+}
diff --git a/src/utils/Browser.ts b/src/shared/utils/Browser.ts
similarity index 76%
rename from src/utils/Browser.ts
rename to src/shared/utils/Browser.ts
index 48c0c3748..be71d875e 100644
--- a/src/utils/Browser.ts
+++ b/src/shared/utils/Browser.ts
@@ -3,8 +3,6 @@
  * @license MIT
  */
 
-import { contains } from './Generic';
-
 const isNode = (typeof navigator === 'undefined') ? true : false;
 const userAgent = (isNode) ? 'node' : navigator.userAgent;
 const platform = (isNode) ? 'node' : navigator.platform;
@@ -20,3 +18,12 @@ export const isIpad = platform === 'iPad';
 export const isIphone = platform === 'iPhone';
 export const isMSWindows = contains(['Windows', 'Win16', 'Win32', 'WinCE'], platform);
 export const isLinux = platform.indexOf('Linux') >= 0;
+
+/**
+ * Return if the given array contains the given element
+ * @param {Array} array The array to search for the given element.
+ * @param {Object} el The element to look for into the array
+ */
+function contains(arr: any[], el: any): boolean {
+  return arr.indexOf(el) >= 0;
+}
diff --git a/src/utils/CharMeasure.test.ts b/src/utils/CharMeasure.test.ts
index f50ce96b7..e4f4e1d6b 100644
--- a/src/utils/CharMeasure.test.ts
+++ b/src/utils/CharMeasure.test.ts
@@ -4,8 +4,8 @@
  */
 
 import jsdom = require('jsdom');
+import { ICharMeasure, ITerminal } from '../Types';
 import { assert } from 'chai';
-import { ICharMeasure, ITerminal } from '../Interfaces';
 import { CharMeasure } from './CharMeasure';
 
 describe('CharMeasure', () => {
diff --git a/src/utils/CharMeasure.ts b/src/utils/CharMeasure.ts
index 62291ab23..91cfce5ff 100644
--- a/src/utils/CharMeasure.ts
+++ b/src/utils/CharMeasure.ts
@@ -3,8 +3,8 @@
  * @license MIT
  */
 
+import { ICharMeasure, ITerminal, ITerminalOptions } from '../Types';
 import { EventEmitter } from '../EventEmitter';
-import { ICharMeasure, ITerminal, ITerminalOptions } from '../Interfaces';
 
 /**
  * Utility class that measures the size of a character. Measurements are done in
diff --git a/src/utils/CircularList.ts b/src/utils/CircularList.ts
index 97a32b790..6b74971b6 100644
--- a/src/utils/CircularList.ts
+++ b/src/utils/CircularList.ts
@@ -4,7 +4,7 @@
  */
 
 import { EventEmitter } from '../EventEmitter';
-import { ICircularList } from '../Interfaces';
+import { ICircularList } from '../Types';
 
 /**
  * Represents a circular list; a list with a maximum size that wraps around when push is called,
diff --git a/src/utils/Generic.ts b/src/utils/Generic.ts
deleted file mode 100644
index 4bc6c487f..000000000
--- a/src/utils/Generic.ts
+++ /dev/null
@@ -1,13 +0,0 @@
-/**
- * Copyright (c) 2016 The xterm.js authors. All rights reserved.
- * @license MIT
- */
-
-/**
- * Return if the given array contains the given element
- * @param {Array} array The array to search for the given element.
- * @param {Object} el The element to look for into the array
- */
-export function contains(arr: any[], el: any): boolean {
-  return arr.indexOf(el) >= 0;
-}
diff --git a/src/utils/MouseHelper.ts b/src/utils/MouseHelper.ts
index d7d8f6981..f62593eb3 100644
--- a/src/utils/MouseHelper.ts
+++ b/src/utils/MouseHelper.ts
@@ -3,8 +3,8 @@
  * @license MIT
  */
 
-import { ICharMeasure } from '../Interfaces';
-import { IRenderer } from '../renderer/Interfaces';
+import { ICharMeasure } from '../Types';
+import { IRenderer } from '../renderer/Types';
 
 export class MouseHelper {
   constructor(private _renderer: IRenderer) {}
@@ -24,7 +24,7 @@ export class MouseHelper {
     while (element) {
       x -= element.offsetLeft;
       y -= element.offsetTop;
-      element = 'offsetParent' in element ? <HTMLElement>element.offsetParent : <HTMLElement>element.parentElement;
+      element = <HTMLElement>element.offsetParent;
     }
     element = originalElement;
     while (element && element !== element.ownerDocument.body) {
diff --git a/src/utils/TestUtils.test.ts b/src/utils/TestUtils.test.ts
index 80e252774..0744cd142 100644
--- a/src/utils/TestUtils.test.ts
+++ b/src/utils/TestUtils.test.ts
@@ -3,13 +3,73 @@
  * @license MIT
  */
 
-import { ITerminal, IBuffer, IBufferSet, IBrowser, ICharMeasure, ISelectionManager, ITerminalOptions, IListenerType, IInputHandlingTerminal, IViewport, ICircularList, ICompositionHelper, ITheme, ILinkifier, IMouseHelper } from '../Interfaces';
-import { LineData } from '../Types';
+import { IColorSet, IRenderer, IRenderDimensions, IColorManager } from '../renderer/Types';
+import { LineData, IInputHandlingTerminal, IViewport, ICompositionHelper, ITerminal, IBuffer, IBufferSet, IBrowser, ICharMeasure, ISelectionManager, ITerminalOptions, ICircularList, ILinkifier, IMouseHelper, ILinkMatcherOptions } from '../Types';
 import { Buffer } from '../Buffer';
-import * as Browser from './Browser';
-import { IColorSet, IRenderer, IRenderDimensions, IColorManager } from '../renderer/Interfaces';
+import * as Browser from '../shared/utils/Browser';
+import { ITheme } from 'xterm';
 
 export class MockTerminal implements ITerminal {
+  getOption(key: any): any {
+    throw new Error('Method not implemented.');
+  }
+  setOption(key: any, value: any): void {
+    throw new Error('Method not implemented.');
+  }
+  blur(): void {
+    throw new Error('Method not implemented.');
+  }
+  focus(): void {
+    throw new Error('Method not implemented.');
+  }
+  resize(columns: number, rows: number): void {
+    throw new Error('Method not implemented.');
+  }
+  writeln(data: string): void {
+    throw new Error('Method not implemented.');
+  }
+  open(parent: HTMLElement): void {
+    throw new Error('Method not implemented.');
+  }
+  attachCustomKeyEventHandler(customKeyEventHandler: (event: KeyboardEvent) => boolean): void {
+    throw new Error('Method not implemented.');
+  }
+  registerLinkMatcher(regex: RegExp, handler: (event: MouseEvent, uri: string) => boolean | void, options?: ILinkMatcherOptions): number {
+    throw new Error('Method not implemented.');
+  }
+  deregisterLinkMatcher(matcherId: number): void {
+    throw new Error('Method not implemented.');
+  }
+  hasSelection(): boolean {
+    throw new Error('Method not implemented.');
+  }
+  getSelection(): string {
+    throw new Error('Method not implemented.');
+  }
+  clearSelection(): void {
+    throw new Error('Method not implemented.');
+  }
+  selectAll(): void {
+    throw new Error('Method not implemented.');
+  }
+  destroy(): void {
+    throw new Error('Method not implemented.');
+  }
+  scrollPages(pageCount: number): void {
+    throw new Error('Method not implemented.');
+  }
+  scrollToTop(): void {
+    throw new Error('Method not implemented.');
+  }
+  scrollToBottom(): void {
+    throw new Error('Method not implemented.');
+  }
+  clear(): void {
+    throw new Error('Method not implemented.');
+  }
+  write(data: string): void {
+    throw new Error('Method not implemented.');
+  }
   bracketedPasteMode: boolean;
   mouseHelper: IMouseHelper;
   renderer: IRenderer;
@@ -39,7 +99,7 @@ export class MockTerminal implements ITerminal {
   on(event: string, callback: () => void): void {
     throw new Error('Method not implemented.');
   }
-  off(type: string, listener: IListenerType): void {
+  off(type: string, listener: (...args: any[]) => void): void {
     throw new Error('Method not implemented.');
   }
   scrollLines(disp: number, suppressScrollEvent: boolean): void {
@@ -184,10 +244,10 @@ export class MockInputHandlingTerminal implements IInputHandlingTerminal {
   setOption(key: string, value: any): void {
     this.options[key] = value;
   }
-  on(type: string, listener: IListenerType): void {
+  on(type: string, listener: (...args: any[]) => void): void {
     throw new Error('Method not implemented.');
   }
-  off(type: string, listener: IListenerType): void {
+  off(type: string, listener: (...args: any[]) => void): void {
     throw new Error('Method not implemented.');
   }
   emit(type: string, data?: any): void {
@@ -220,10 +280,10 @@ export class MockBuffer implements IBuffer {
 
 export class MockRenderer implements IRenderer {
   colorManager: IColorManager;
-  on(type: string, listener: IListenerType): void {
+  on(type: string, listener: (...args: any[]) => void): void {
     throw new Error('Method not implemented.');
   }
-  off(type: string, listener: IListenerType): void {
+  off(type: string, listener: (...args: any[]) => void): void {
     throw new Error('Method not implemented.');
   }
   emit(type: string, data?: any): void {
diff --git a/tsconfig.json b/tsconfig.json
index a3aa790cf..38bfd2faf 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -5,8 +5,7 @@
     "rootDir": "src",
     "outDir": "lib",
     "sourceMap": true,
-    "removeComments": true,
-    "declaration": true
+    "removeComments": true
   },
   "include": [
     "src/**/*"
diff --git a/tslint.json b/tslint.json
index b5367f6a0..f6ad759a7 100644
--- a/tslint.json
+++ b/tslint.json
@@ -24,6 +24,7 @@
       "parameter"
     ],
     "eofline": true,
+    "no-duplicate-imports": true,
     "no-eval": true,
     "no-internal-module": true,
     "no-trailing-whitespace": true,
diff --git a/typings/xterm.d.ts b/typings/xterm.d.ts
index 37f169e87..dbd1eebc6 100644
--- a/typings/xterm.d.ts
+++ b/typings/xterm.d.ts
@@ -192,10 +192,16 @@ declare module 'xterm' {
     priority?: number;
   }
 
+  export interface IEventEmitter {
+    on(type: string, listener: (...args: any[]) => void): void;
+    off(type: string, listener: (...args: any[]) => void): void;
+    emit(type: string, data?: any): void;
+  }
+
   /**
    * The class that represents an xterm.js terminal.
    */
-  export class Terminal {
+  export class Terminal implements IEventEmitter {
     /**
      * The element containing the terminal.
      */
@@ -244,7 +250,7 @@ declare module 'xterm' {
      * @param type The type of the event.
      * @param listener The listener.
      */
-    on(type: 'data', listener: (data?: string) => void): void;
+    on(type: 'data', listener: (...args: any[]) => void): void;
     /**
      * Registers an event listener.
      * @param type The type of the event.
@@ -295,6 +301,8 @@ declare module 'xterm' {
      */
     off(type: 'blur' | 'focus' | 'linefeed' | 'selection' | 'data' | 'key' | 'keypress' | 'keydown' | 'refresh' | 'resize' | 'scroll' | 'title' | string, listener: (...args: any[]) => void): void;
 
+    emit(type: string, data?: any): void;
+
     /**
      * Resizes the terminal.
      * @param x The number of columns to resize to.
@@ -366,22 +374,6 @@ declare module 'xterm' {
      */
     selectAll(): void;
 
-    // /**
-    //  * Find the next instance of the term, then scroll to and select it. If it
-    //  * doesn't exist, do nothing.
-    //  * @param term Tne search term.
-    //  * @return Whether a result was found.
-    //  */
-    // findNext(term: string): boolean;
-
-    // /**
-    //  * Find the previous instance of the term, then scroll to and select it. If it
-    //  * doesn't exist, do nothing.
-    //  * @param term Tne search term.
-    //  * @return Whether a result was found.
-    //  */
-    // findPrevious(term: string): boolean;
-
     /**
      * Destroys the terminal and detaches it from the DOM.
      */