diff --git a/src/vs/editor/common/model/mirrorModel2.ts b/src/vs/editor/common/model/mirrorModel2.ts
index be3b5542db6..a5c1a9474e1 100644
--- a/src/vs/editor/common/model/mirrorModel2.ts
+++ b/src/vs/editor/common/model/mirrorModel2.ts
@@ -5,9 +5,32 @@
 'use strict';
 
 import URI from 'vs/base/common/uri';
-import { IModelContentChangedEvent2, IPosition, IRange } from 'vs/editor/common/editorCommon';
+import { IPosition, IRange } from 'vs/editor/common/editorCommon';
 import { PrefixSumComputer } from 'vs/editor/common/viewModel/prefixSumComputer';
 
+export interface IModelChangedData {
+	/**
+	 * The range that got replaced.
+	 */
+	readonly range: IRange;
+	/**
+	 * The length of the range that got replaced.
+	 */
+	readonly rangeLength: number;
+	/**
+	 * The new text for the range.
+	 */
+	readonly text: string;
+	/**
+	 * The (new) end-of-line character.
+	 */
+	readonly eol: string;
+	/**
+	 * The new version id the model has transitioned to.
+	 */
+	readonly versionId: number;
+}
+
 export class MirrorModel2 {
 
 	protected _uri: URI;
@@ -35,7 +58,7 @@ export class MirrorModel2 {
 		return this._lines.join(this._eol);
 	}
 
-	onEvents(events: IModelContentChangedEvent2[]): void {
+	onEvents(events: IModelChangedData[]): void {
 		let newEOL: string = null;
 		for (let i = 0, len = events.length; i < len; i++) {
 			let e = events[i];
diff --git a/src/vs/workbench/api/node/extHost.protocol.ts b/src/vs/workbench/api/node/extHost.protocol.ts
index d1542e8168a..bb9e97ab01f 100644
--- a/src/vs/workbench/api/node/extHost.protocol.ts
+++ b/src/vs/workbench/api/node/extHost.protocol.ts
@@ -38,6 +38,7 @@ import { IApplyEditsOptions, IUndoStopOptions, TextEditorRevealType, ITextEditor
 
 import { InternalTreeExplorerNodeContent } from 'vs/workbench/parts/explorers/common/treeExplorerViewModel';
 import { TaskSet } from 'vs/workbench/parts/tasks/common/tasks';
+import { IModelChangedData } from 'vs/editor/common/model/mirrorModel2';
 
 export interface IEnvironment {
 	enableProposedApi: boolean;
@@ -312,7 +313,7 @@ export abstract class ExtHostDocumentsShape {
 	$acceptModelSaved(strURL: string): void { throw ni(); }
 	$acceptModelDirty(strURL: string): void { throw ni(); }
 	$acceptModelReverted(strURL: string): void { throw ni(); }
-	$acceptModelChanged(strURL: string, events: editorCommon.IModelContentChangedEvent2[], isDirty: boolean): void { throw ni(); }
+	$acceptModelChanged(strURL: string, events: IModelChangedData[], isDirty: boolean): void { throw ni(); }
 }
 
 export abstract class ExtHostDocumentSaveParticipantShape {
diff --git a/src/vs/workbench/api/node/extHostDocuments.ts b/src/vs/workbench/api/node/extHostDocuments.ts
index f2eded6cbc6..e043cd0e948 100644
--- a/src/vs/workbench/api/node/extHostDocuments.ts
+++ b/src/vs/workbench/api/node/extHostDocuments.ts
@@ -19,6 +19,7 @@ import { TextSource } from 'vs/editor/common/model/textSource';
 import { MainContext, MainThreadDocumentsShape, ExtHostDocumentsShape } from './extHost.protocol';
 import { ExtHostDocumentData, setWordDefinitionFor } from './extHostDocumentData';
 import { ExtHostDocumentsAndEditors } from './extHostDocumentsAndEditors';
+import { IModelChangedData } from 'vs/editor/common/model/mirrorModel2';
 
 export class ExtHostDocuments extends ExtHostDocumentsShape {
 
@@ -184,7 +185,7 @@ export class ExtHostDocuments extends ExtHostDocumentsShape {
 		document._acceptIsDirty(false);
 	}
 
-	public $acceptModelChanged(strURL: string, events: editorCommon.IModelContentChangedEvent2[], isDirty: boolean): void {
+	public $acceptModelChanged(strURL: string, events: IModelChangedData[], isDirty: boolean): void {
 		let data = this._documentsAndEditors.getDocument(strURL);
 		data._acceptIsDirty(isDirty);
 		data.onEvents(events);
diff --git a/src/vs/workbench/test/electron-browser/api/extHostDocumentData.test.ts b/src/vs/workbench/test/electron-browser/api/extHostDocumentData.test.ts
index dc5eb511d62..b5a318b7ba1 100644
--- a/src/vs/workbench/test/electron-browser/api/extHostDocumentData.test.ts
+++ b/src/vs/workbench/test/electron-browser/api/extHostDocumentData.test.ts
@@ -10,9 +10,9 @@ import URI from 'vs/base/common/uri';
 import { ExtHostDocumentData } from 'vs/workbench/api/node/extHostDocumentData';
 import { Position } from 'vs/workbench/api/node/extHostTypes';
 import { Range as CodeEditorRange } from 'vs/editor/common/core/range';
-import * as EditorCommon from 'vs/editor/common/editorCommon';
 import { MainThreadDocumentsShape } from 'vs/workbench/api/node/extHost.protocol';
 import { TPromise } from 'vs/base/common/winjs.base';
+import { IModelChangedData } from 'vs/editor/common/model/mirrorModel2';
 
 
 suite('ExtHostDocumentData', () => {
@@ -101,8 +101,6 @@ suite('ExtHostDocumentData', () => {
 			range: { startLineNumber: 1, startColumn: 1, endLineNumber: 1, endColumn: 1 },
 			text: '\t ',
 			eol: undefined,
-			isRedoing: undefined,
-			isUndoing: undefined,
 			versionId: undefined,
 			rangeLength: undefined,
 		}]);
@@ -157,8 +155,6 @@ suite('ExtHostDocumentData', () => {
 			range: { startLineNumber: 1, startColumn: 3, endLineNumber: 1, endColumn: 6 },
 			text: '',
 			eol: undefined,
-			isRedoing: undefined,
-			isUndoing: undefined,
 			versionId: undefined,
 			rangeLength: undefined,
 		}]);
@@ -174,8 +170,6 @@ suite('ExtHostDocumentData', () => {
 			range: { startLineNumber: 1, startColumn: 3, endLineNumber: 1, endColumn: 6 },
 			text: 'is could be',
 			eol: undefined,
-			isRedoing: undefined,
-			isUndoing: undefined,
 			versionId: undefined,
 			rangeLength: undefined,
 		}]);
@@ -191,8 +185,6 @@ suite('ExtHostDocumentData', () => {
 			range: { startLineNumber: 1, startColumn: 3, endLineNumber: 1, endColumn: 6 },
 			text: 'is could be\na line with number',
 			eol: undefined,
-			isRedoing: undefined,
-			isUndoing: undefined,
 			versionId: undefined,
 			rangeLength: undefined,
 		}]);
@@ -211,8 +203,6 @@ suite('ExtHostDocumentData', () => {
 			range: { startLineNumber: 1, startColumn: 3, endLineNumber: 2, endColumn: 6 },
 			text: '',
 			eol: undefined,
-			isRedoing: undefined,
-			isUndoing: undefined,
 			versionId: undefined,
 			rangeLength: undefined,
 		}]);
@@ -311,19 +301,17 @@ suite('ExtHostDocumentData updates line mapping', () => {
 		}
 	}
 
-	function createChangeEvent(range: CodeEditorRange, text: string, eol?: string): EditorCommon.IModelContentChangedEvent2 {
+	function createChangeEvent(range: CodeEditorRange, text: string, eol?: string): IModelChangedData {
 		return {
 			range: range,
 			text: text,
 			eol: eol,
-			isRedoing: undefined,
-			isUndoing: undefined,
 			versionId: undefined,
 			rangeLength: undefined,
 		};
 	}
 
-	function testLineMappingDirectionAfterEvents(lines: string[], eol: string, direction: AssertDocumentLineMappingDirection, events: EditorCommon.IModelContentChangedEvent2[]): void {
+	function testLineMappingDirectionAfterEvents(lines: string[], eol: string, direction: AssertDocumentLineMappingDirection, events: IModelChangedData[]): void {
 		let myDocument = new ExtHostDocumentData(undefined, URI.file(''), lines.slice(0), eol, 'text', 1, false);
 		assertDocumentLineMapping(myDocument, direction);
 
@@ -331,7 +319,7 @@ suite('ExtHostDocumentData updates line mapping', () => {
 		assertDocumentLineMapping(myDocument, direction);
 	}
 
-	function testLineMappingAfterEvents(lines: string[], events: EditorCommon.IModelContentChangedEvent2[]): void {
+	function testLineMappingAfterEvents(lines: string[], events: IModelChangedData[]): void {
 		testLineMappingDirectionAfterEvents(lines, '\n', AssertDocumentLineMappingDirection.PositionToOffset, events);
 		testLineMappingDirectionAfterEvents(lines, '\n', AssertDocumentLineMappingDirection.OffsetToPosition, events);
 
diff --git a/src/vs/workbench/test/electron-browser/api/extHostDocumentSaveParticipant.test.ts b/src/vs/workbench/test/electron-browser/api/extHostDocumentSaveParticipant.test.ts
index 9f51444c3a7..4b913d8b289 100644
--- a/src/vs/workbench/test/electron-browser/api/extHostDocumentSaveParticipant.test.ts
+++ b/src/vs/workbench/test/electron-browser/api/extHostDocumentSaveParticipant.test.ts
@@ -289,7 +289,7 @@ suite('ExtHostDocumentSaveParticipant', () => {
 				versionId: 2,
 				range: { startLineNumber: 1, startColumn: 1, endLineNumber: 1, endColumn: 1 },
 				text: 'bar',
-				rangeLength: undefined, eol: undefined, isRedoing: undefined, isUndoing: undefined,
+				rangeLength: undefined, eol: undefined
 			}], true);
 
 			e.waitUntil(TPromise.as([TextEdit.insert(new Position(0, 0), 'bar')]));
@@ -314,7 +314,7 @@ suite('ExtHostDocumentSaveParticipant', () => {
 						range,
 						text: newText,
 						versionId: documents.getDocumentData(resource).version + 1,
-						rangeLength: undefined, eol: undefined, isRedoing: undefined, isUndoing: undefined,
+						rangeLength: undefined, eol: undefined
 					}], true);
 				}
 				return TPromise.as(true);