diff --git a/README.md b/README.md
index 93e7f262a..85c2ac18c 100644
--- a/README.md
+++ b/README.md
@@ -122,6 +122,9 @@ computational environment for Jupyter, supporting interactive data science and s
 - [**Kubebox**](https://github.com/astefanutti/kubebox): Terminal console for Kubernetes clusters.
 - [**Azure Cloud Shell**](https://shell.azure.com): Azure Cloud Shell is a Microsoft-managed admin machine built on Azure, for Azure.
 - [**atom-xterm**](https://atom.io/packages/atom-xterm): Atom plugin for providing terminals inside your Atom workspace.
+- [**rtty**](https://github.com/zhaojh329/rtty): A reverse proxy WebTTY. It is composed of the client and the server.
+- [**Pisth**](https://github.com/ColdGrub1384/Pisth): An SFTP and SSH client for iOS
+- [**abstruse**](https://github.com/bleenco/abstruse): Abstruse CI is a continuous integration platform based on Node.JS and Docker.
 
 Do you use xterm.js in your application as well? Please [open a Pull Request](https://github.com/sourcelair/xterm.js/pulls) to include it here. We would love to have it in our list.
 
diff --git a/demo/index.html b/demo/index.html
index 93399f9cd..da348f5e6 100644
--- a/demo/index.html
+++ b/demo/index.html
@@ -23,6 +23,9 @@
           <p>
             <label><input type="checkbox" id="option-cursor-blink"> cursorBlink</label>
           </p>
+          <p>
+            <label><input type="checkbox" id="option-mac-option-is-meta"> macOptionIsMeta</label>
+          </p>
           <p>
             <label>
               cursorStyle
diff --git a/demo/main.js b/demo/main.js
index 95b15a0db..1faf77d8a 100644
--- a/demo/main.js
+++ b/demo/main.js
@@ -27,6 +27,7 @@ var terminalContainer = document.getElementById('terminal-container'),
     optionElements = {
       cursorBlink: document.querySelector('#option-cursor-blink'),
       cursorStyle: document.querySelector('#option-cursor-style'),
+      macOptionIsMeta: document.querySelector('#option-mac-option-is-meta'),
       scrollback: document.querySelector('#option-scrollback'),
       tabstopwidth: document.querySelector('#option-tabstopwidth'),
       bellStyle: document.querySelector('#option-bell-style')
@@ -72,6 +73,9 @@ optionElements.cursorStyle.addEventListener('change', function () {
 optionElements.bellStyle.addEventListener('change', function () {
   term.setOption('bellStyle', optionElements.bellStyle.value);
 });
+optionElements.macOptionIsMeta.addEventListener('change', function () {
+  term.setOption('macOptionIsMeta', optionElements.macOptionIsMeta.checked);
+});
 optionElements.scrollback.addEventListener('change', function () {
   term.setOption('scrollback', parseInt(optionElements.scrollback.value, 10));
 });
@@ -87,6 +91,7 @@ function createTerminal() {
     terminalContainer.removeChild(terminalContainer.children[0]);
   }
   term = new Terminal({
+    macOptionIsMeta: optionElements.macOptionIsMeta.enabled,
     cursorBlink: optionElements.cursorBlink.checked,
     scrollback: parseInt(optionElements.scrollback.value, 10),
     tabStopWidth: parseInt(optionElements.tabstopwidth.value, 10)
diff --git a/fixtures/typings-test/typings-test.ts b/fixtures/typings-test/typings-test.ts
index b33362377..2aa2264ed 100644
--- a/fixtures/typings-test/typings-test.ts
+++ b/fixtures/typings-test/typings-test.ts
@@ -142,9 +142,11 @@ namespace methods_core {
       const r18: (data: string) => void = t.getOption('handler');
       const r19: string = t.getOption('bellSound');
       const r20: string = t.getOption('bellStyle');
-      const r21: number = t.getOption('letterSpacing');
-      const r22: number = t.getOption('fontWeight');
-      const r23: number = t.getOption('fontWeightBold');
+      const r21: boolean = t.getOption('enableBold');
+      const r22: number = t.getOption('letterSpacing');
+      const r23: boolean = t.getOption('macOptionIsMeta');
+      const r24: number = t.getOption('fontWeight');
+      const r25: number = t.getOption('fontWeightBold');
     }
     {
       const t: Terminal = new Terminal();
@@ -179,6 +181,7 @@ namespace methods_core {
       t.setOption('lineHeight', 1);
       t.setOption('fontFamily', 'foo');
       t.setOption('theme', {background: '#ff0000'});
+      t.setOption('macOptionIsMeta', true);
     }
   }
   namespace scrolling {
diff --git a/src/Buffer.ts b/src/Buffer.ts
index 623c38543..3e7d61224 100644
--- a/src/Buffer.ts
+++ b/src/Buffer.ts
@@ -121,11 +121,6 @@ export class Buffer implements IBuffer {
       if (this._terminal.cols < newCols) {
         const ch: CharData = [this._terminal.defAttr, ' ', 1, 32]; // does xterm use the default attr?
         for (let i = 0; i < this._lines.length; i++) {
-          // TODO: This should be removed, with tests setup for the case that was
-          // causing the underlying bug, see https://github.com/sourcelair/xterm.js/issues/824
-          if (this._lines.get(i) === undefined) {
-            this._lines.set(i, this._terminal.blankLine(undefined, undefined, newCols));
-          }
           while (this._lines.get(i).length < newCols) {
             this._lines.get(i).push(ch);
           }
diff --git a/src/BufferSet.ts b/src/BufferSet.ts
index e31d2278f..da8c75f24 100644
--- a/src/BufferSet.ts
+++ b/src/BufferSet.ts
@@ -61,24 +61,35 @@ export class BufferSet extends EventEmitter implements IBufferSet {
    * Sets the normal Buffer of the BufferSet as its currently active Buffer
    */
   public activateNormalBuffer(): void {
+    if (this._activeBuffer === this._normal) {
+      return;
+    }
     // The alt buffer should always be cleared when we switch to the normal
     // buffer. This frees up memory since the alt buffer should always be new
     // when activated.
     this._alt.clear();
-
     this._activeBuffer = this._normal;
-    this.emit('activate', this._normal);
+    this.emit('activate', {
+      activeBuffer: this._normal,
+      inactiveBuffer: this._alt
+    });
   }
 
   /**
    * Sets the alt Buffer of the BufferSet as its currently active Buffer
    */
   public activateAltBuffer(): void {
+    if (this._activeBuffer === this._alt) {
+      return;
+    }
     // Since the alt buffer is always cleared when the normal buffer is
     // activated, we want to fill it when switching to it.
     this._alt.fillViewportRows();
     this._activeBuffer = this._alt;
-    this.emit('activate', this._alt);
+    this.emit('activate', {
+      activeBuffer: this._alt,
+      inactiveBuffer: this._normal
+    });
   }
 
   /**
diff --git a/src/InputHandler.ts b/src/InputHandler.ts
index 7d3a4d24b..96e34cc07 100644
--- a/src/InputHandler.ts
+++ b/src/InputHandler.ts
@@ -928,7 +928,6 @@ export class InputHandler implements IInputHandler {
         case 47: // alt screen buffer
         case 1047: // alt screen buffer
           this._terminal.buffers.activateAltBuffer();
-          this._terminal.selectionManager.setBuffer(this._terminal.buffer);
           this._terminal.viewport.syncScrollArea();
           this._terminal.showCursor();
           break;
@@ -1100,7 +1099,6 @@ export class InputHandler implements IInputHandler {
           // if (params[0] === 1049) {
           //   this.restoreCursor(params);
           // }
-          this._terminal.selectionManager.setBuffer(this._terminal.buffer);
           this._terminal.refresh(0, this._terminal.rows - 1);
           this._terminal.viewport.syncScrollArea();
           this._terminal.showCursor();
diff --git a/src/Interfaces.ts b/src/Interfaces.ts
index 9ddc129c0..424f76925 100644
--- a/src/Interfaces.ts
+++ b/src/Interfaces.ts
@@ -144,6 +144,7 @@ export interface ITerminalOptions {
   handler?: (data: string) => void;
   letterSpacing?: number;
   lineHeight?: number;
+  macOptionIsMeta?: boolean;
   rows?: number;
   screenKeys?: boolean;
   scrollback?: number;
@@ -170,7 +171,7 @@ export interface IBuffer {
   prevStop(x?: number): number;
 }
 
-export interface IBufferSet {
+export interface IBufferSet extends IEventEmitter {
   alt: IBuffer;
   normal: IBuffer;
   active: IBuffer;
@@ -199,7 +200,6 @@ export interface ISelectionManager {
 
   disable(): void;
   enable(): void;
-  setBuffer(buffer: IBuffer): void;
   setSelection(row: number, col: number, length: number): void;
 }
 
diff --git a/src/Linkifier.ts b/src/Linkifier.ts
index 767719301..b5f30b562 100644
--- a/src/Linkifier.ts
+++ b/src/Linkifier.ts
@@ -82,12 +82,12 @@ export class Linkifier extends EventEmitter implements ILinkifier {
     }
 
     // Increase range to linkify
-    if (!this._rowsToLinkify.start) {
+    if (this._rowsToLinkify.start === null) {
       this._rowsToLinkify.start = start;
       this._rowsToLinkify.end = end;
     } else {
-      this._rowsToLinkify.start = this._rowsToLinkify.start < start ? this._rowsToLinkify.start : start;
-      this._rowsToLinkify.end = this._rowsToLinkify.end > end ? this._rowsToLinkify.end : end;
+      this._rowsToLinkify.start = Math.min(this._rowsToLinkify.start, start);
+      this._rowsToLinkify.end = Math.max(this._rowsToLinkify.end, end);
     }
 
     // Clear out any existing links on this row range
diff --git a/src/SelectionManager.test.ts b/src/SelectionManager.test.ts
index a10dc6692..97afcf2b7 100644
--- a/src/SelectionManager.test.ts
+++ b/src/SelectionManager.test.ts
@@ -21,10 +21,9 @@ class TestMockTerminal extends MockTerminal {
 class TestSelectionManager extends SelectionManager {
   constructor(
     terminal: ITerminal,
-    buffer: IBuffer,
     charMeasure: CharMeasure
   ) {
-    super(terminal, buffer, charMeasure);
+    super(terminal, charMeasure);
   }
 
   public get model(): SelectionModel { return this._model; }
@@ -59,7 +58,7 @@ describe('SelectionManager', () => {
     terminal.buffers = new BufferSet(terminal);
     terminal.buffer = terminal.buffers.active;
     buffer = terminal.buffer;
-    selectionManager = new TestSelectionManager(terminal, buffer, null);
+    selectionManager = new TestSelectionManager(terminal, null);
   });
 
   function stringToRow(text: string): LineData {
diff --git a/src/SelectionManager.ts b/src/SelectionManager.ts
index cd6fc9961..608ca4124 100644
--- a/src/SelectionManager.ts
+++ b/src/SelectionManager.ts
@@ -8,7 +8,7 @@ import * as Browser from './utils/Browser';
 import { CharMeasure } from './utils/CharMeasure';
 import { CircularList } from './utils/CircularList';
 import { EventEmitter } from './EventEmitter';
-import { ITerminal, ICircularList, ISelectionManager, IBuffer } from './Interfaces';
+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';
@@ -95,10 +95,10 @@ export class SelectionManager extends EventEmitter implements ISelectionManager
 
   private _mouseMoveListener: EventListener;
   private _mouseUpListener: EventListener;
+  private _trimListener: IListenerType;
 
   constructor(
     private _terminal: ITerminal,
-    private _buffer: IBuffer,
     private _charMeasure: CharMeasure
   ) {
     super();
@@ -109,18 +109,24 @@ export class SelectionManager extends EventEmitter implements ISelectionManager
     this._activeSelectionMode = SelectionMode.NORMAL;
   }
 
+  private get _buffer(): IBuffer {
+    return this._terminal.buffers.active;
+  }
+
   /**
    * Initializes listener variables.
    */
   private _initListeners(): void {
     this._mouseMoveListener = event => this._onMouseMove(<MouseEvent>event);
     this._mouseUpListener = event => this._onMouseUp(<MouseEvent>event);
+    this._trimListener = (amount: number) => this._onTrim(amount);
 
-    // Only adjust the selection on trim, shiftElements is rarely used (only in
-    // reverseIndex) and delete in a splice is only ever used when the same
-    // number of elements was just added. Given this is could actually be
-    // beneficial to leave the selection as is for these cases.
-    this._buffer.lines.on('trim', (amount: number) => this._onTrim(amount));
+    this.initBuffersListeners();
+  }
+
+  public initBuffersListeners(): void {
+    this._terminal.buffer.lines.on('trim', this._trimListener);
+    this._terminal.buffers.on('activate', e => this._onBufferActivate(e));
   }
 
   /**
@@ -139,16 +145,6 @@ export class SelectionManager extends EventEmitter implements ISelectionManager
     this._enabled = true;
   }
 
-  /**
-   * Sets the active buffer, this should be called when the alt buffer is
-   * switched in or out.
-   * @param buffer The active buffer.
-   */
-  public setBuffer(buffer: IBuffer): void {
-    this._buffer = buffer;
-    this.clearSelection();
-  }
-
   public get selectionStart(): [number, number] { return this._model.finalSelectionStart; }
   public get selectionEnd(): [number, number] { return this._model.finalSelectionEnd; }
 
@@ -547,6 +543,16 @@ export class SelectionManager extends EventEmitter implements ISelectionManager
       this._terminal.emit('selection');
   }
 
+  private _onBufferActivate(e: {activeBuffer: IBuffer, inactiveBuffer: IBuffer}): void {
+    this.clearSelection();
+    // Only adjust the selection on trim, shiftElements is rarely used (only in
+    // reverseIndex) and delete in a splice is only ever used when the same
+    // number of elements was just added. Given this is could actually be
+    // beneficial to leave the selection as is for these cases.
+    e.inactiveBuffer.lines.off('trim', this._trimListener);
+    e.activeBuffer.lines.on('trim', this._trimListener);
+  }
+
   /**
    * Converts a viewport column to the character index on the buffer line, the
    * latter takes into account wide characters.
diff --git a/src/Terminal.test.ts b/src/Terminal.test.ts
index 9cb0b75c1..946e9efb1 100644
--- a/src/Terminal.test.ts
+++ b/src/Terminal.test.ts
@@ -503,6 +503,9 @@ describe('term.js addons', () => {
       it('should return \\x1b[5C for alt+right', () => {
         assert.equal(term.evaluateKeyEscapeSequence({ altKey: true, keyCode: 39 }).key, '\x1b[1;5C'); // CSI 5 C
       });
+      it('should return \\x1ba for alt+a', () => {
+        assert.equal(term.evaluateKeyEscapeSequence({ altKey: true, keyCode: 65 }).key, '\x1ba');
+      });
     });
 
     describe('On macOS platforms', () => {
@@ -515,6 +518,19 @@ describe('term.js addons', () => {
       it('should return \\x1bf for alt+right', () => {
         assert.equal(term.evaluateKeyEscapeSequence({ altKey: true, keyCode: 39 }).key, '\x1bf'); // CSI 5 C
       });
+      it('should return undefined for alt+a', () => {
+        assert.strictEqual(term.evaluateKeyEscapeSequence({ altKey: true, keyCode: 65 }).key, undefined);
+      });
+    });
+
+    describe('with macOptionIsMeta', () => {
+      beforeEach(() => {
+        term.browser.isMac = true;
+        term.setOption('macOptionIsMeta', true);
+      });
+      it('should return \\x1ba for alt+a', () => {
+        assert.equal(term.evaluateKeyEscapeSequence({ altKey: true, keyCode: 65 }).key, '\x1ba');
+      });
     });
 
     it('should return \\x1b[5A for alt+up', () => {
@@ -597,6 +613,22 @@ describe('term.js addons', () => {
       };
     });
 
+    describe('with macOptionIsMeta', () => {
+      beforeEach(() => {
+        term.browser.isMac = true;
+        term.setOption('macOptionIsMeta', true);
+      });
+
+      it('should interfere with the alt key on keyDown', () => {
+        evKeyDown.altKey = true;
+        evKeyDown.keyCode = 81;
+        assert.equal(term.keyDown(evKeyDown), false);
+        evKeyDown.altKey = true;
+        evKeyDown.keyCode = 192;
+        assert.equal(term.keyDown(evKeyDown), false);
+      });
+    });
+
     describe('On Mac OS', () => {
       beforeEach(() => {
         term.browser.isMac = true;
diff --git a/src/Terminal.ts b/src/Terminal.ts
index aae3a1015..044f5351f 100644
--- a/src/Terminal.ts
+++ b/src/Terminal.ts
@@ -81,6 +81,7 @@ const DEFAULT_OPTIONS: ITerminalOptions = {
   scrollback: 1000,
   screenKeys: false,
   debug: false,
+  macOptionIsMeta: false,
   cancelEvents: false,
   disableStdin: false,
   useFlowControl: false,
@@ -193,7 +194,6 @@ export class Terminal extends EventEmitter implements ITerminal, IInputHandlingT
   public selectionManager: SelectionManager;
   public linkifier: ILinkifier;
   public buffers: BufferSet;
-  public buffer: Buffer;
   public viewport: IViewport;
   private compositionHelper: ICompositionHelper;
   public charMeasure: CharMeasure;
@@ -294,17 +294,19 @@ export class Terminal extends EventEmitter implements ITerminal, IInputHandlingT
 
     // Create the terminal's buffers and set the current buffer
     this.buffers = new BufferSet(this);
-    this.buffer = this.buffers.active;  // Convenience shortcut;
-    this.buffers.on('activate', (buffer: Buffer) => {
-      this.buffer = buffer;
-    });
-
-    // Ensure the selection manager has the correct buffer
     if (this.selectionManager) {
-      this.selectionManager.setBuffer(this.buffer);
+      this.selectionManager.clearSelection();
+      this.selectionManager.initBuffersListeners();
     }
   }
 
+  /**
+   * Convenience property to active buffer.
+   */
+  public get buffer(): Buffer {
+    return this.buffers.active;
+  }
+
   /**
    * back_color_erase feature for xterm.
    */
@@ -653,7 +655,7 @@ export class Terminal extends EventEmitter implements ITerminal, IInputHandlingT
     this.charMeasure.on('charsizechanged', () => this.renderer.onResize(this.cols, this.rows, true));
     this.renderer.on('resize', (dimensions) => this.viewport.syncScrollArea());
 
-    this.selectionManager = new SelectionManager(this, this.buffer, this.charMeasure);
+    this.selectionManager = new SelectionManager(this, this.charMeasure);
     this.element.addEventListener('mousedown', (e: MouseEvent) => this.selectionManager.onMouseDown(e));
     this.selectionManager.on('refresh', data => this.renderer.onSelectionChanged(data.start, data.end));
     this.selectionManager.on('newselection', text => {
@@ -1386,7 +1388,7 @@ export class Terminal extends EventEmitter implements ITerminal, IInputHandlingT
       return this.cancel(ev, true);
     }
 
-    if (isThirdLevelShift(this.browser, ev)) {
+    if (this._isThirdLevelShift(this.browser, ev)) {
       return true;
     }
 
@@ -1407,6 +1409,19 @@ export class Terminal extends EventEmitter implements ITerminal, IInputHandlingT
     return this.cancel(ev, true);
   }
 
+  private _isThirdLevelShift(browser: IBrowser, ev: KeyboardEvent): boolean {
+    const thirdLevelKey =
+        (browser.isMac && !this.options.macOptionIsMeta && ev.altKey && !ev.ctrlKey && !ev.metaKey) ||
+        (browser.isMSWindows && ev.altKey && ev.ctrlKey && !ev.metaKey);
+
+    if (ev.type === 'keypress') {
+      return thirdLevelKey;
+    }
+
+    // Don't invoke for arrows, pageDown, home, backspace, etc. (on non-keypress events)
+    return thirdLevelKey && (!ev.keyCode || ev.keyCode > 47);
+  }
+
   /**
    * Returns an object that determines how a KeyboardEvent should be handled. The key of the
    * returned value is the new key code to pass to the PTY.
@@ -1711,8 +1726,8 @@ export class Terminal extends EventEmitter implements ITerminal, IInputHandlingT
             // ^] - Operating System Command (OSC)
             result.key = String.fromCharCode(29);
           }
-        } else if (!this.browser.isMac && ev.altKey && !ev.ctrlKey && !ev.metaKey) {
-          // On Mac this is a third level shift. Use <Esc> instead.
+        } else if ((!this.browser.isMac || this.options.macOptionIsMeta) && ev.altKey && !ev.ctrlKey && !ev.metaKey) {
+          // On macOS this is a third level shift when !macOptionIsMeta. Use <Esc> instead.
           if (ev.keyCode >= 65 && ev.keyCode <= 90) {
             result.key = C0.ESC + String.fromCharCode(ev.keyCode + 32);
           } else if (ev.keyCode === 192) {
@@ -1778,7 +1793,7 @@ export class Terminal extends EventEmitter implements ITerminal, IInputHandlingT
     }
 
     if (!key || (
-      (ev.altKey || ev.ctrlKey || ev.metaKey) && !isThirdLevelShift(this.browser, ev)
+      (ev.altKey || ev.ctrlKey || ev.metaKey) && !this._isThirdLevelShift(this.browser, ev)
     )) {
       return false;
     }
@@ -2092,11 +2107,9 @@ export class Terminal extends EventEmitter implements ITerminal, IInputHandlingT
     this.options.cols = this.cols;
     const customKeyEventHandler = this.customKeyEventHandler;
     const inputHandler = this.inputHandler;
-    const buffers = this.buffers;
     this.setup();
     this.customKeyEventHandler = customKeyEventHandler;
     this.inputHandler = inputHandler;
-    this.buffers = buffers;
     this.refresh(0, this.rows - 1);
     this.viewport.syncScrollArea();
   }
@@ -2172,19 +2185,6 @@ function off(el: any, type: string, handler: (event: Event) => any, capture: boo
   el.removeEventListener(type, handler, capture);
 }
 
-function isThirdLevelShift(browser: IBrowser, ev: KeyboardEvent): boolean {
-  const thirdLevelKey =
-      (browser.isMac && ev.altKey && !ev.ctrlKey && !ev.metaKey) ||
-      (browser.isMSWindows && ev.altKey && ev.ctrlKey && !ev.metaKey);
-
-  if (ev.type === 'keypress') {
-    return thirdLevelKey;
-  }
-
-  // Don't invoke for arrows, pageDown, home, backspace, etc. (on non-keypress events)
-  return thirdLevelKey && (!ev.keyCode || ev.keyCode > 47);
-}
-
 function wasMondifierKeyOnlyEvent(ev: KeyboardEvent): boolean {
   return ev.keyCode === 16 || // Shift
     ev.keyCode === 17 || // Ctrl
diff --git a/src/addons/attach/Intefaces.ts b/src/addons/attach/Intefaces.ts
new file mode 100644
index 000000000..ab809af9c
--- /dev/null
+++ b/src/addons/attach/Intefaces.ts
@@ -0,0 +1,18 @@
+/**
+ * Copyright (c) 2018 The xterm.js authors. All rights reserved.
+ * @license MIT
+ *
+ * Implements the attach method, that attaches the terminal to a WebSocket stream.
+ */
+
+import { Terminal } from 'xterm';
+
+export interface IAttachAddonTerminal extends Terminal {
+  __socket?: WebSocket;
+  __attachSocketBuffer?: string;
+
+  __getMessage?(ev: MessageEvent): void;
+  __flushBuffer?(): void;
+  __pushToBuffer?(data: string): void;
+  __sendData?(data: string): void;
+}
diff --git a/src/addons/attach/attach.test.ts b/src/addons/attach/attach.test.ts
index a13885bbc..018cfb31c 100644
--- a/src/addons/attach/attach.test.ts
+++ b/src/addons/attach/attach.test.ts
@@ -12,7 +12,7 @@ class MockTerminal {}
 describe('attach addon', () => {
   describe('apply', () => {
     it('should do register the `attach` and `detach` methods', () => {
-      attach.apply(MockTerminal);
+      attach.apply(<any>MockTerminal);
       assert.equal(typeof (<any>MockTerminal).prototype.attach, 'function');
       assert.equal(typeof (<any>MockTerminal).prototype.detach, 'function');
     });
diff --git a/src/addons/attach/attach.ts b/src/addons/attach/attach.ts
index ba9386958..d963a658f 100644
--- a/src/addons/attach/attach.ts
+++ b/src/addons/attach/attach.ts
@@ -5,38 +5,42 @@
  * Implements the attach method, that attaches the terminal to a WebSocket stream.
  */
 
+/// <reference path="../../../typings/xterm.d.ts"/>
+
+import { Terminal } from 'xterm';
+import { IAttachAddonTerminal } from './Intefaces';
+
 /**
  * Attaches the given terminal to the given socket.
  *
- * @param {Terminal} term - The terminal to be attached to the given socket.
- * @param {WebSocket} socket - The socket to attach the current terminal.
- * @param {boolean} bidirectional - Whether the terminal should send data
- *                                  to the socket as well.
- * @param {boolean} buffered - Whether the rendering of incoming data
- *                             should happen instantly or at a maximum
- *                             frequency of 1 rendering per 10ms.
+ * @param term The terminal to be attached to the given socket.
+ * @param socket The socket to attach the current terminal.
+ * @param bidirectional Whether the terminal should send data to the socket as well.
+ * @param buffered Whether the rendering of incoming data should happen instantly or at a maximum
+ * frequency of 1 rendering per 10ms.
  */
-export function attach(term: any, socket: WebSocket, bidirectional: boolean, buffered: boolean): void {
+export function attach(term: Terminal, socket: WebSocket, bidirectional: boolean, buffered: boolean): void {
+  const addonTerminal = <IAttachAddonTerminal>term;
   bidirectional = (typeof bidirectional === 'undefined') ? true : bidirectional;
-  term.socket = socket;
+  addonTerminal.__socket = socket;
 
-  term._flushBuffer = () => {
-    term.write(term._attachSocketBuffer);
-    term._attachSocketBuffer = null;
+  addonTerminal.__flushBuffer = () => {
+    addonTerminal.write(addonTerminal.__attachSocketBuffer);
+    addonTerminal.__attachSocketBuffer = null;
   };
 
-  term._pushToBuffer = (data: string) => {
-    if (term._attachSocketBuffer) {
-      term._attachSocketBuffer += data;
+  addonTerminal.__pushToBuffer = (data: string) => {
+    if (addonTerminal.__attachSocketBuffer) {
+      addonTerminal.__attachSocketBuffer += data;
     } else {
-      term._attachSocketBuffer = data;
-      setTimeout(term._flushBuffer, 10);
+      addonTerminal.__attachSocketBuffer = data;
+      setTimeout(addonTerminal.__flushBuffer, 10);
     }
   };
 
   let myTextDecoder;
 
-  term._getMessage = function(ev: MessageEvent): void {
+  addonTerminal.__getMessage = function(ev: MessageEvent): void {
     let str;
     if (typeof ev.data === 'object') {
       if (ev.data instanceof ArrayBuffer) {
@@ -51,71 +55,68 @@ export function attach(term: any, socket: WebSocket, bidirectional: boolean, buf
     }
 
     if (buffered) {
-      term._pushToBuffer(str || ev.data);
+      addonTerminal.__pushToBuffer(str || ev.data);
     } else {
-      term.write(str || ev.data);
+      addonTerminal.write(str || ev.data);
     }
   };
 
-  term._sendData = (data: string) => {
+  addonTerminal.__sendData = (data: string) => {
     if (socket.readyState !== 1) {
       return;
     }
     socket.send(data);
   };
 
-  socket.addEventListener('message', term._getMessage);
+  socket.addEventListener('message', addonTerminal.__getMessage);
 
   if (bidirectional) {
-    term.on('data', term._sendData);
+    addonTerminal.on('data', addonTerminal.__sendData);
   }
 
-  socket.addEventListener('close', term.detach.bind(term, socket));
-  socket.addEventListener('error', term.detach.bind(term, socket));
+  socket.addEventListener('close', () => detach(addonTerminal, socket));
+  socket.addEventListener('error', () => detach(addonTerminal, socket));
 }
 
 /**
  * Detaches the given terminal from the given socket
  *
- * @param {Terminal} term - The terminal to be detached from the given socket.
- * @param {WebSocket} socket - The socket from which to detach the current
- *                             terminal.
+ * @param term The terminal to be detached from the given socket.
+ * @param socket The socket from which to detach the current terminal.
  */
-export function detach(term: any, socket: WebSocket): void {
-  term.off('data', term._sendData);
+export function detach(term: Terminal, socket: WebSocket): void {
+  const addonTerminal = <IAttachAddonTerminal>term;
+  addonTerminal.off('data', addonTerminal.__sendData);
 
-  socket = (typeof socket === 'undefined') ? term.socket : socket;
+  socket = (typeof socket === 'undefined') ? addonTerminal.__socket : socket;
 
   if (socket) {
-    socket.removeEventListener('message', term._getMessage);
+    socket.removeEventListener('message', addonTerminal.__getMessage);
   }
 
-  delete term.socket;
+  delete addonTerminal.__socket;
 }
 
 
-export function apply(terminalConstructor: any): void {
+export function apply(terminalConstructor: typeof Terminal): void {
   /**
    * Attaches the current terminal to the given socket
    *
-   * @param {WebSocket} socket - The socket to attach the current terminal.
-   * @param {boolean} bidirectional - Whether the terminal should send data
-   *                                  to the socket as well.
-   * @param {boolean} buffered - Whether the rendering of incoming data
-   *                             should happen instantly or at a maximum
-   *                             frequency of 1 rendering per 10ms.
+   * @param socket The socket to attach the current terminal.
+   * @param bidirectional Whether the terminal should send data to the socket as well.
+   * @param buffered Whether the rendering of incoming data should happen instantly or at a maximum
+   * frequency of 1 rendering per 10ms.
    */
-  terminalConstructor.prototype.attach = function (socket: WebSocket, bidirectional: boolean, buffered: boolean): void {
+  (<any>terminalConstructor.prototype).attach = function (socket: WebSocket, bidirectional: boolean, buffered: boolean): void {
     attach(this, socket, bidirectional, buffered);
   };
 
   /**
    * Detaches the current terminal from the given socket.
    *
-   * @param {WebSocket} socket - The socket from which to detach the current
-   *                             terminal.
+   * @param socket The socket from which to detach the current terminal.
    */
-  terminalConstructor.prototype.detach = function (socket: WebSocket): void {
+  (<any>terminalConstructor.prototype).detach = function (socket: WebSocket): void {
     detach(this, socket);
   };
 }
diff --git a/src/addons/fit/fit.test.ts b/src/addons/fit/fit.test.ts
index 0dc179630..9a6d89fd0 100644
--- a/src/addons/fit/fit.test.ts
+++ b/src/addons/fit/fit.test.ts
@@ -12,7 +12,7 @@ class MockTerminal {}
 describe('fit addon', () => {
   describe('apply', () => {
     it('should do register the `proposeGeometry` and `fit` methods', () => {
-      fit.apply(MockTerminal);
+      fit.apply(<any>MockTerminal);
       assert.equal(typeof (<any>MockTerminal).prototype.proposeGeometry, 'function');
       assert.equal(typeof (<any>MockTerminal).prototype.fit, 'function');
     });
diff --git a/src/addons/fit/fit.ts b/src/addons/fit/fit.ts
index 631110941..75e854d97 100644
--- a/src/addons/fit/fit.ts
+++ b/src/addons/fit/fit.ts
@@ -13,12 +13,16 @@
  *          row and truncate its width with the current number of columns).
  */
 
+/// <reference path="../../../typings/xterm.d.ts"/>
+
+import { Terminal } from 'xterm';
+
 export interface IGeometry {
   rows: number;
   cols: number;
 }
 
-export function proposeGeometry(term: any): IGeometry {
+export function proposeGeometry(term: Terminal): IGeometry {
   if (!term.element.parentElement) {
     return null;
   }
@@ -31,30 +35,30 @@ export function proposeGeometry(term: any): IGeometry {
   const availableHeight = parentElementHeight - elementPaddingVer;
   const availableWidth = parentElementWidth - elementPaddingHor;
   const geometry = {
-    cols: Math.floor(availableWidth / term.renderer.dimensions.actualCellWidth),
-    rows: Math.floor(availableHeight / term.renderer.dimensions.actualCellHeight)
+    cols: Math.floor(availableWidth / (<any>term).renderer.dimensions.actualCellWidth),
+    rows: Math.floor(availableHeight / (<any>term).renderer.dimensions.actualCellHeight)
   };
 
   return geometry;
 }
 
-export function fit(term: any): void {
+export function fit(term: Terminal): void {
   const geometry = proposeGeometry(term);
   if (geometry) {
     // Force a full render
     if (term.rows !== geometry.rows || term.cols !== geometry.cols) {
-      term.renderer.clear();
+      (<any>term).renderer.clear();
       term.resize(geometry.cols, geometry.rows);
     }
   }
 }
 
-export function apply(terminalConstructor: any): void {
-  terminalConstructor.prototype.proposeGeometry = function (): IGeometry {
+export function apply(terminalConstructor: typeof Terminal): void {
+  (<any>terminalConstructor.prototype).proposeGeometry = function (): IGeometry {
     return proposeGeometry(this);
   };
 
-  terminalConstructor.prototype.fit = function (): void {
+  (<any>terminalConstructor.prototype).fit = function (): void {
     fit(this);
   };
 }
diff --git a/src/addons/fullscreen/fullscreen.test.ts b/src/addons/fullscreen/fullscreen.test.ts
index 9326ac4e7..bb98bd30d 100644
--- a/src/addons/fullscreen/fullscreen.test.ts
+++ b/src/addons/fullscreen/fullscreen.test.ts
@@ -12,7 +12,7 @@ class MockTerminal {}
 describe('fullscreen addon', () => {
   describe('apply', () => {
     it('should do register the `toggleFullscreen` method', () => {
-      fullscreen.apply(MockTerminal);
+      fullscreen.apply(<any>MockTerminal);
       assert.equal(typeof (<any>MockTerminal).prototype.toggleFullScreen, 'function');
     });
   });
diff --git a/src/addons/fullscreen/fullscreen.ts b/src/addons/fullscreen/fullscreen.ts
index 2e5b72e1f..474406677 100644
--- a/src/addons/fullscreen/fullscreen.ts
+++ b/src/addons/fullscreen/fullscreen.ts
@@ -3,13 +3,17 @@
  * @license MIT
  */
 
+/// <reference path="../../../typings/xterm.d.ts"/>
+
+import { Terminal } from 'xterm';
+
 /**
  * Toggle the given terminal's fullscreen mode.
- * @param {Terminal} term - The terminal to toggle full screen mode
- * @param {boolean} fullscreen - Toggle fullscreen on (true) or off (false)
+ * @param term The terminal to toggle full screen mode
+ * @param fullscreen Toggle fullscreen on (true) or off (false)
  */
-export function toggleFullScreen(term: any, fullscreen: boolean): void {
-  let fn;
+export function toggleFullScreen(term: Terminal, fullscreen: boolean): void {
+  let fn: string;
 
   if (typeof fullscreen === 'undefined') {
     fn = (term.element.classList.contains('fullscreen')) ? 'remove' : 'add';
@@ -22,8 +26,8 @@ export function toggleFullScreen(term: any, fullscreen: boolean): void {
   term.element.classList[fn]('fullscreen');
 }
 
-export function apply(terminalConstructor: any): void {
-  terminalConstructor.prototype.toggleFullScreen = function (fullscreen: boolean): void {
+export function apply(terminalConstructor: typeof Terminal): void {
+  (<any>terminalConstructor.prototype).toggleFullScreen = function (fullscreen: boolean): void {
     toggleFullScreen(this, fullscreen);
   };
 }
diff --git a/src/addons/search/Interfaces.ts b/src/addons/search/Interfaces.ts
new file mode 100644
index 000000000..6faa03e2e
--- /dev/null
+++ b/src/addons/search/Interfaces.ts
@@ -0,0 +1,19 @@
+/**
+ * Copyright (c) 2018 The xterm.js authors. All rights reserved.
+ * @license MIT
+ */
+
+import { Terminal } from 'xterm';
+
+export interface ISearchAddonTerminal extends Terminal {
+  __searchHelper?: ISearchHelper;
+
+  // TODO: Reuse ITerminal from core
+  buffer: any;
+  selectionManager: any;
+}
+
+export interface ISearchHelper {
+  findNext(term: string): boolean;
+  findPrevious(term: string): boolean;
+}
diff --git a/src/addons/search/SearchHelper.ts b/src/addons/search/SearchHelper.ts
index 5735dd48e..dd941682a 100644
--- a/src/addons/search/SearchHelper.ts
+++ b/src/addons/search/SearchHelper.ts
@@ -3,8 +3,7 @@
  * @license MIT
  */
 
-// import { ITerminal } from '../../Interfaces';
-// import { translateBufferLineToString } from '../../utils/BufferLine';
+import { ISearchHelper, ISearchAddonTerminal } from './Interfaces';
 
 interface ISearchResult {
   term: string;
@@ -15,8 +14,8 @@ interface ISearchResult {
 /**
  * A class that knows how to search the terminal and how to display the results.
  */
-export class SearchHelper {
-  constructor(private _terminal: any) {
+export class SearchHelper implements ISearchHelper {
+  constructor(private _terminal: ISearchAddonTerminal) {
     // TODO: Search for multiple instances on 1 line
     // TODO: Don't use the actual selection, instead use a "find selection" so multiple instances can be highlighted
     // TODO: Highlight other instances in the viewport
@@ -134,7 +133,7 @@ export class SearchHelper {
       return false;
     }
     this._terminal.selectionManager.setSelection(result.col, result.row, result.term.length);
-    this._terminal.scrollLines(result.row - this._terminal.buffer.ydisp, false);
+    this._terminal.scrollLines(result.row - this._terminal.buffer.ydisp);
     return true;
   }
 }
diff --git a/src/addons/search/search.ts b/src/addons/search/search.ts
index 473c78fcf..5c0b2b96d 100644
--- a/src/addons/search/search.ts
+++ b/src/addons/search/search.ts
@@ -3,8 +3,11 @@
  * @license MIT
  */
 
-import { SearchHelper } from './SearchHelper';
+/// <reference path="../../../typings/xterm.d.ts"/>
 
+import { SearchHelper } from './SearchHelper';
+import { Terminal } from 'xterm';
+import { ISearchAddonTerminal } from './Interfaces';
 
 /**
  * Find the next instance of the term, then scroll to and select it. If it
@@ -12,11 +15,12 @@ import { SearchHelper } from './SearchHelper';
  * @param term Tne search term.
  * @return Whether a result was found.
  */
-export function findNext(terminal: any, term: string): boolean {
-  if (!terminal._searchHelper) {
-    terminal.searchHelper = new SearchHelper(terminal);
+export function findNext(terminal: Terminal, term: string): boolean {
+  const addonTerminal = <ISearchAddonTerminal>terminal;
+  if (!addonTerminal.__searchHelper) {
+    addonTerminal.__searchHelper = new SearchHelper(addonTerminal);
   }
-  return (<SearchHelper>terminal.searchHelper).findNext(term);
+  return addonTerminal.__searchHelper.findNext(term);
 }
 
 /**
@@ -25,19 +29,20 @@ export function findNext(terminal: any, term: string): boolean {
  * @param term Tne search term.
  * @return Whether a result was found.
  */
-export function findPrevious(terminal: any, term: string): boolean {
-  if (!terminal._searchHelper) {
-    terminal.searchHelper = new SearchHelper(terminal);
+export function findPrevious(terminal: Terminal, term: string): boolean {
+  const addonTerminal = <ISearchAddonTerminal>terminal;
+  if (!addonTerminal.__searchHelper) {
+    addonTerminal.__searchHelper = new SearchHelper(addonTerminal);
   }
-  return (<SearchHelper>terminal.searchHelper).findPrevious(term);
+  return addonTerminal.__searchHelper.findPrevious(term);
 }
 
-export function apply(terminalConstructor: any): void {
-  terminalConstructor.prototype.findNext = function(term: any): boolean {
+export function apply(terminalConstructor: typeof Terminal): void {
+  (<any>terminalConstructor.prototype).findNext = function(term: string): boolean {
     return findNext(this, term);
   };
 
-  terminalConstructor.prototype.findPrevious = function(term: any): boolean {
+  (<any>terminalConstructor.prototype).findPrevious = function(term: string): boolean {
     return findPrevious(this, term);
   };
 }
diff --git a/src/addons/terminado/Intefaces.ts b/src/addons/terminado/Intefaces.ts
new file mode 100644
index 000000000..8f17b0cc7
--- /dev/null
+++ b/src/addons/terminado/Intefaces.ts
@@ -0,0 +1,19 @@
+/**
+ * Copyright (c) 2018 The xterm.js authors. All rights reserved.
+ * @license MIT
+ *
+ * Implements the attach method, that attaches the terminal to a WebSocket stream.
+ */
+
+import { Terminal } from 'xterm';
+
+export interface ITerminadoAddonTerminal extends Terminal {
+  __socket?: WebSocket;
+  __attachSocketBuffer?: string;
+
+  __getMessage?(ev: MessageEvent): void;
+  __flushBuffer?(): void;
+  __pushToBuffer?(data: string): void;
+  __sendData?(data: string): void;
+  __setSize?(size: {rows: number, cols: number}): void;
+}
diff --git a/src/addons/terminado/terminado.test.ts b/src/addons/terminado/terminado.test.ts
index e258bd7cb..2e4a53c5a 100644
--- a/src/addons/terminado/terminado.test.ts
+++ b/src/addons/terminado/terminado.test.ts
@@ -12,7 +12,7 @@ class MockTerminal {}
 describe('terminado addon', () => {
   describe('apply', () => {
     it('should do register the `terminadoAttach` and `terminadoDetach` methods', () => {
-      terminado.apply(MockTerminal);
+      terminado.apply(<any>MockTerminal);
       assert.equal(typeof (<any>MockTerminal).prototype.terminadoAttach, 'function');
       assert.equal(typeof (<any>MockTerminal).prototype.terminadoDetach, 'function');
     });
diff --git a/src/addons/terminado/terminado.ts b/src/addons/terminado/terminado.ts
index e703198fe..d5cf72d1b 100644
--- a/src/addons/terminado/terminado.ts
+++ b/src/addons/terminado/terminado.ts
@@ -6,106 +6,107 @@
  * WebSocket stream.
  */
 
+/// <reference path="../../../typings/xterm.d.ts"/>
+
+import { Terminal } from 'xterm';
+import { ITerminadoAddonTerminal } from './Intefaces';
+
 /**
  * Attaches the given terminal to the given socket.
  *
- * @param {Terminal} term - The terminal to be attached to the given socket.
- * @param {WebSocket} socket - The socket to attach the current terminal.
- * @param {boolean} bidirectional - Whether the terminal should send data
- *                                  to the socket as well.
- * @param {boolean} buffered - Whether the rendering of incoming data
- *                             should happen instantly or at a maximum
- *                             frequency of 1 rendering per 10ms.
+ * @param term The terminal to be attached to the given socket.
+ * @param socket The socket to attach the current terminal.
+ * @param bidirectional Whether the terminal should send data to the socket as well.
+ * @param buffered Whether the rendering of incoming data should happen instantly or at a maximum
+ * frequency of 1 rendering per 10ms.
  */
-export function terminadoAttach(term: any, socket: WebSocket, bidirectional: boolean, buffered: boolean): void {
+export function terminadoAttach(term: Terminal, socket: WebSocket, bidirectional: boolean, buffered: boolean): void {
+  const addonTerminal = <ITerminadoAddonTerminal>term;
   bidirectional = (typeof bidirectional === 'undefined') ? true : bidirectional;
-  term.socket = socket;
+  addonTerminal.__socket = socket;
 
-  term._flushBuffer = () => {
-    term.write(term._attachSocketBuffer);
-    term._attachSocketBuffer = null;
+  addonTerminal.__flushBuffer = () => {
+    addonTerminal.write(addonTerminal.__attachSocketBuffer);
+    addonTerminal.__attachSocketBuffer = null;
   };
 
-  term._pushToBuffer = (data) => {
-    if (term._attachSocketBuffer) {
-      term._attachSocketBuffer += data;
+  addonTerminal.__pushToBuffer = (data: string) => {
+    if (addonTerminal.__attachSocketBuffer) {
+      addonTerminal.__attachSocketBuffer += data;
     } else {
-      term._attachSocketBuffer = data;
-      setTimeout(term._flushBuffer, 10);
+      addonTerminal.__attachSocketBuffer = data;
+      setTimeout(addonTerminal.__flushBuffer, 10);
     }
   };
 
-  term._getMessage = (ev: MessageEvent) => {
+  addonTerminal.__getMessage = (ev: MessageEvent) => {
     const data = JSON.parse(ev.data);
     if (data[0] === 'stdout') {
       if (buffered) {
-        term._pushToBuffer(data[1]);
+        addonTerminal.__pushToBuffer(data[1]);
       } else {
-        term.write(data[1]);
+        addonTerminal.write(data[1]);
       }
     }
   };
 
-  term._sendData = (data: string) => {
+  addonTerminal.__sendData = (data: string) => {
     socket.send(JSON.stringify(['stdin', data]));
   };
 
-  term._setSize = (size: {rows: number, cols: number}) => {
+  addonTerminal.__setSize = (size: {rows: number, cols: number}) => {
     socket.send(JSON.stringify(['set_size', size.rows, size.cols]));
   };
 
-  socket.addEventListener('message', term._getMessage);
+  socket.addEventListener('message', addonTerminal.__getMessage);
 
   if (bidirectional) {
-    term.on('data', term._sendData);
+    addonTerminal.on('data', addonTerminal.__sendData);
   }
-  term.on('resize', term._setSize);
+  addonTerminal.on('resize', addonTerminal.__setSize);
 
-  socket.addEventListener('close', term.terminadoDetach.bind(term, socket));
-  socket.addEventListener('error', term.terminadoDetach.bind(term, socket));
+  socket.addEventListener('close', () => terminadoDetach(addonTerminal, socket));
+  socket.addEventListener('error', () => terminadoDetach(addonTerminal, socket));
 }
 
 /**
  * Detaches the given terminal from the given socket
  *
- * @param {Xterm} term - The terminal to be detached from the given socket.
- * @param {WebSocket} socket - The socket from which to detach the current
- *                             terminal.
+ * @param term The terminal to be detached from the given socket.
+ * @param socket The socket from which to detach the current terminal.
  */
-export function terminadoDetach(term: any, socket: WebSocket): void {
-  term.off('data', term._sendData);
+export function terminadoDetach(term: Terminal, socket: WebSocket): void {
+  const addonTerminal = <ITerminadoAddonTerminal>term;
+  addonTerminal.off('data', addonTerminal.__sendData);
 
-  socket = (typeof socket === 'undefined') ? term.socket : socket;
+  socket = (typeof socket === 'undefined') ? addonTerminal.__socket : socket;
 
   if (socket) {
-    socket.removeEventListener('message', term._getMessage);
+    socket.removeEventListener('message', addonTerminal.__getMessage);
   }
 
-  delete term.socket;
+  delete addonTerminal.__socket;
 }
 
-export function apply(terminalConstructor: any): void {
+export function apply(terminalConstructor: typeof Terminal): void {
   /**
    * Attaches the current terminal to the given socket
    *
-   * @param {WebSocket} socket - The socket to attach the current terminal.
-   * @param {boolean} bidirectional - Whether the terminal should send data
-   *                                  to the socket as well.
-   * @param {boolean} buffered - Whether the rendering of incoming data
-   *                             should happen instantly or at a maximum
-   *                             frequency of 1 rendering per 10ms.
+   * @param socket - The socket to attach the current terminal.
+   * @param bidirectional - Whether the terminal should send data to the socket as well.
+   * @param buffered - Whether the rendering of incoming data should happen instantly or at a
+   * maximum frequency of 1 rendering per 10ms.
    */
-  terminalConstructor.prototype.terminadoAttach = function(socket: WebSocket, bidirectional: boolean, buffered: boolean): void {
+  (<any>terminalConstructor.prototype).terminadoAttach = function (socket: WebSocket, bidirectional: boolean, buffered: boolean): void {
     return terminadoAttach(this, socket, bidirectional, buffered);
   };
 
   /**
    * Detaches the current terminal from the given socket.
    *
-   * @param {WebSocket} socket - The socket from which to detach the current
-   *                             terminal.
+   * @param socket The socket from which to detach the current terminal.
    */
-  terminalConstructor.prototype.terminadoDetach = function(socket: WebSocket): void {
+  (<any>terminalConstructor.prototype).terminadoDetach = function (socket: WebSocket): void {
     return terminadoDetach(this, socket);
   };
 }
diff --git a/src/addons/winptyCompat/Interfaces.ts b/src/addons/winptyCompat/Interfaces.ts
new file mode 100644
index 000000000..8e02c64b5
--- /dev/null
+++ b/src/addons/winptyCompat/Interfaces.ts
@@ -0,0 +1,10 @@
+/**
+ * Copyright (c) 2018 The xterm.js authors. All rights reserved.
+ * @license MIT
+ */
+
+import { Terminal } from 'xterm';
+
+export interface IWinptyCompatAddonTerminal extends Terminal {
+  buffer: any;
+}
diff --git a/src/addons/winptyCompat/winptyCompat.test.ts b/src/addons/winptyCompat/winptyCompat.test.ts
index 73761fc90..0c9269edc 100644
--- a/src/addons/winptyCompat/winptyCompat.test.ts
+++ b/src/addons/winptyCompat/winptyCompat.test.ts
@@ -12,7 +12,7 @@ class MockTerminal {}
 describe('winptyCompat addon', () => {
   describe('apply', () => {
     it('should do register the `winptyCompatInit` method', () => {
-      winptyCompat.apply(MockTerminal);
+      winptyCompat.apply(<any>MockTerminal);
       assert.equal(typeof (<any>MockTerminal).prototype.winptyCompatInit, 'function');
     });
   });
diff --git a/src/addons/winptyCompat/winptyCompat.ts b/src/addons/winptyCompat/winptyCompat.ts
index b594355bc..61524e125 100644
--- a/src/addons/winptyCompat/winptyCompat.ts
+++ b/src/addons/winptyCompat/winptyCompat.ts
@@ -3,36 +3,43 @@
  * @license MIT
  */
 
-export function winptyCompatInit(terminal: any): void {
-    // Don't do anything when the platform is not Windows
-    const isWindows = ['Windows', 'Win16', 'Win32', 'WinCE'].indexOf(navigator.platform) >= 0;
-    if (!isWindows) {
-      return;
+/// <reference path="../../../typings/xterm.d.ts"/>
+
+import { Terminal } from 'xterm';
+import { IWinptyCompatAddonTerminal } from './Interfaces';
+
+export function winptyCompatInit(terminal: Terminal): void {
+  const addonTerminal = <IWinptyCompatAddonTerminal>terminal;
+
+  // Don't do anything when the platform is not Windows
+  const isWindows = ['Windows', 'Win16', 'Win32', 'WinCE'].indexOf(navigator.platform) >= 0;
+  if (!isWindows) {
+    return;
+  }
+
+  // Winpty does not support wraparound mode which means that lines will never
+  // be marked as wrapped. This causes issues for things like copying a line
+  // retaining the wrapped new line characters or if consumers are listening
+  // in on the data stream.
+  //
+  // The workaround for this is to listen to every incoming line feed and mark
+  // the line as wrapped if the last character in the previous line is not a
+  // space. This is certainly not without its problems, but generally on
+  // Windows when text reaches the end of the terminal it's likely going to be
+  // wrapped.
+  addonTerminal.on('linefeed', () => {
+    const line = addonTerminal.buffer.lines.get(addonTerminal.buffer.ybase + addonTerminal.buffer.y - 1);
+    const lastChar = line[addonTerminal.cols - 1];
+
+    if (lastChar[3] !== 32 /* ' ' */) {
+      const nextLine = addonTerminal.buffer.lines.get(addonTerminal.buffer.ybase + addonTerminal.buffer.y);
+      (<any>nextLine).isWrapped = true;
     }
-
-    // Winpty does not support wraparound mode which means that lines will never
-    // be marked as wrapped. This causes issues for things like copying a line
-    // retaining the wrapped new line characters or if consumers are listening
-    // in on the data stream.
-    //
-    // The workaround for this is to listen to every incoming line feed and mark
-    // the line as wrapped if the last character in the previous line is not a
-    // space. This is certainly not without its problems, but generally on
-    // Windows when text reaches the end of the terminal it's likely going to be
-    // wrapped.
-    terminal.on('linefeed', () => {
-      const line = terminal.buffer.lines.get(terminal.buffer.ybase + terminal.buffer.y - 1);
-      const lastChar = line[terminal.cols - 1];
-
-      if (lastChar[3] !== 32 /* ' ' */) {
-        const nextLine = terminal.buffer.lines.get(terminal.buffer.ybase + terminal.buffer.y);
-        (<any>nextLine).isWrapped = true;
-      }
-    });
+  });
 }
 
-export function apply(terminalConstructor: any): void {
-  terminalConstructor.prototype.winptyCompatInit = function(): void {
+export function apply(terminalConstructor: typeof Terminal): void {
+  (<any>terminalConstructor.prototype).winptyCompatInit = function (): void {
     winptyCompatInit(this);
   };
 }
diff --git a/src/addons/zmodem/zmodem.test.ts b/src/addons/zmodem/zmodem.test.ts
index 7646b7ccb..682e62c80 100644
--- a/src/addons/zmodem/zmodem.test.ts
+++ b/src/addons/zmodem/zmodem.test.ts
@@ -12,7 +12,7 @@ class MockTerminal {}
 describe('zmodem addon', () => {
   describe('apply', () => {
     it('should do register the `zmodemAttach` method and `zmodemBrowser` attribute', () => {
-      zmodem.apply(MockTerminal);
+      zmodem.apply(<any>MockTerminal);
       assert.equal(typeof (<any>MockTerminal).prototype.zmodemAttach, 'function');
       assert.equal(typeof (<any>MockTerminal).prototype.zmodemBrowser, 'object');
     });
diff --git a/src/addons/zmodem/zmodem.ts b/src/addons/zmodem/zmodem.ts
index 4713f111c..e8a7824d4 100644
--- a/src/addons/zmodem/zmodem.ts
+++ b/src/addons/zmodem/zmodem.ts
@@ -1,3 +1,12 @@
+/**
+ * Copyright (c) 2017 The xterm.js authors. All rights reserved.
+ * @license MIT
+ */
+
+/// <reference path="../../../typings/xterm.d.ts"/>
+
+import { Terminal } from 'xterm';
+
 /**
  *
  * Allow xterm.js to handle ZMODEM uploads and downloads.
@@ -33,7 +42,7 @@ export interface IZModemOptions {
   noTerminalWriteOutsideSession?: boolean;
 }
 
-export function zmodemAttach(term: any, ws: WebSocket, opts: IZModemOptions = {}): void {
+export function zmodemAttach(term: Terminal, ws: WebSocket, opts: IZModemOptions = {}): void {
   const senderFunc = (octets: ArrayLike<number>) => ws.send(new Uint8Array(octets));
 
   let zsentry;
@@ -51,8 +60,8 @@ export function zmodemAttach(term: any, ws: WebSocket, opts: IZModemOptions = {}
       }
     },
     sender: senderFunc,
-    on_retract: () => term.emit('zmodemRetract'),
-    on_detect: (detection: any) => term.emit('zmodemDetect', detection)
+    on_retract: () => (<any>term).emit('zmodemRetract'),
+    on_detect: (detection: any) => (<any>term).emit('zmodemDetect', detection)
   });
 
   function handleWSMessage(evt: MessageEvent): void {
@@ -75,9 +84,9 @@ export function zmodemAttach(term: any, ws: WebSocket, opts: IZModemOptions = {}
   ws.addEventListener('message', handleWSMessage);
 }
 
-export function apply(terminalConstructor: any): void {
+export function apply(terminalConstructor: typeof Terminal): void {
   zmodem = (typeof window === 'object') ? (<any>window).ZModem : {Browser: null};  // Nullify browser for tests
 
-  terminalConstructor.prototype.zmodemAttach = zmodemAttach.bind(this, this);
-  terminalConstructor.prototype.zmodemBrowser = zmodem.Browser;
+  (<any>terminalConstructor.prototype).zmodemAttach = zmodemAttach.bind(this, this);
+  (<any>terminalConstructor.prototype).zmodemBrowser = zmodem.Browser;
 }
diff --git a/typings/xterm.d.ts b/typings/xterm.d.ts
index 3efa78890..7c8612cf6 100644
--- a/typings/xterm.d.ts
+++ b/typings/xterm.d.ts
@@ -460,7 +460,7 @@ declare module 'xterm' {
      * @param key The option key.
      * @param value The option value.
      */
-    setOption(key: 'cancelEvents' | 'convertEol' | 'cursorBlink' | 'debug' | 'disableStdin' | 'enableBold' | 'popOnBell' | 'screenKeys' | 'useFlowControl' | 'visualBell', value: boolean): void;
+    setOption(key: 'cancelEvents' | 'convertEol' | 'cursorBlink' | 'debug' | 'disableStdin' | 'enableBold' | 'macOptionIsMeta' | 'popOnBell' | 'screenKeys' | 'useFlowControl' | 'visualBell', value: boolean): void;
     /**
      * Sets an option on the terminal.
      * @param key The option key.