diff --git a/src/vs/workbench/contrib/debug/browser/loadedScriptsView.ts b/src/vs/workbench/contrib/debug/browser/loadedScriptsView.ts
index 44b5cd4695300eef768a4238153be573e13f2237..7af1f6d3496e4fe6c3a6913efa887b8f70947e95 100644
--- a/src/vs/workbench/contrib/debug/browser/loadedScriptsView.ts
+++ b/src/vs/workbench/contrib/debug/browser/loadedScriptsView.ts
@@ -244,7 +244,7 @@ class SessionTreeItem extends BaseTreeItem {
 
 	private _session: IDebugSession;
 	private _initialized: boolean;
-	private _map: Map<string, BaseTreeItem>;
+	private _map = new Map<string, BaseTreeItem>();
 	private _labelService: ILabelService;
 
 	constructor(labelService: ILabelService, parent: BaseTreeItem, session: IDebugSession, private _environmentService: IEnvironmentService, private rootProvider: IWorkspaceContextService) {
@@ -252,7 +252,6 @@ class SessionTreeItem extends BaseTreeItem {
 		this._labelService = labelService;
 		this._initialized = false;
 		this._session = session;
-		this._map = new Map();
 	}
 
 	getSession(): IDebugSession {
diff --git a/src/vs/workbench/contrib/debug/common/abstractDebugAdapter.ts b/src/vs/workbench/contrib/debug/common/abstractDebugAdapter.ts
index 53c93567d916a3c894b0ac2fd71b076f1b70e100..17dfdf746adc73d2e28999c0a12fe27358285928 100644
--- a/src/vs/workbench/contrib/debug/common/abstractDebugAdapter.ts
+++ b/src/vs/workbench/contrib/debug/common/abstractDebugAdapter.ts
@@ -13,7 +13,7 @@ import { IDebugAdapter } from 'vs/workbench/contrib/debug/common/debug';
 export abstract class AbstractDebugAdapter implements IDebugAdapter {
 
 	private sequence: number;
-	private pendingRequests: Map<number, (e: DebugProtocol.Response) => void>;
+	private pendingRequests = new Map<number, (e: DebugProtocol.Response) => void>();
 	private requestCallback: (request: DebugProtocol.Request) => void;
 	private eventCallback: (request: DebugProtocol.Event) => void;
 	private messageCallback: (message: DebugProtocol.ProtocolMessage) => void;
@@ -22,7 +22,6 @@ export abstract class AbstractDebugAdapter implements IDebugAdapter {
 
 	constructor() {
 		this.sequence = 1;
-		this.pendingRequests = new Map();
 		this._onError = new Emitter<Error>();
 		this._onExit = new Emitter<number>();
 	}
@@ -139,7 +138,7 @@ export abstract class AbstractDebugAdapter implements IDebugAdapter {
 
 	protected cancelPending() {
 		const pending = this.pendingRequests;
-		this.pendingRequests = new Map();
+		this.pendingRequests.clear();
 		setTimeout(_ => {
 			pending.forEach((callback, request_seq) => {
 				const err: DebugProtocol.Response = {
diff --git a/src/vs/workbench/contrib/debug/common/debugModel.ts b/src/vs/workbench/contrib/debug/common/debugModel.ts
index f198b06b03d68926d8506937ffff137539a49290..4c7bba80c43a0f362a28841b287ba2019426975a 100644
--- a/src/vs/workbench/contrib/debug/common/debugModel.ts
+++ b/src/vs/workbench/contrib/debug/common/debugModel.ts
@@ -90,7 +90,7 @@ export class RawObjectReplElement implements IExpression {
 
 export class ExpressionContainer implements IExpressionContainer {
 
-	public static allValues: Map<string, string> = new Map<string, string>();
+	public static allValues = new Map<string, string>();
 	// Use chunks to support variable paging #9537
 	private static readonly BASE_CHUNK_SIZE = 100;
 
diff --git a/src/vs/workbench/contrib/debug/electron-browser/debugConfigurationManager.ts b/src/vs/workbench/contrib/debug/electron-browser/debugConfigurationManager.ts
index 7c53b632718162b815768b49c4b178f5855a33ac..baf0537d8349892be6f135447f95b57cfb574c72 100644
--- a/src/vs/workbench/contrib/debug/electron-browser/debugConfigurationManager.ts
+++ b/src/vs/workbench/contrib/debug/electron-browser/debugConfigurationManager.ts
@@ -52,7 +52,7 @@ export class ConfigurationManager implements IConfigurationManager {
 	private _onDidSelectConfigurationName = new Emitter<void>();
 	private configProviders: IDebugConfigurationProvider[];
 	private adapterDescriptorFactories: IDebugAdapterDescriptorFactory[];
-	private debugAdapterFactories: Map<string, IDebugAdapterFactory>;
+	private debugAdapterFactories = new Map<string, IDebugAdapterFactory>();
 	private terminalLauncher: ITerminalLauncher;
 	private debugConfigurationTypeContext: IContextKey<string>;
 
@@ -78,7 +78,6 @@ export class ConfigurationManager implements IConfigurationManager {
 		const previousSelectedRoot = this.storageService.get(DEBUG_SELECTED_ROOT, StorageScope.WORKSPACE);
 		const previousSelectedLaunch = this.launches.filter(l => l.uri.toString() === previousSelectedRoot).pop();
 		this.debugConfigurationTypeContext = CONTEXT_DEBUG_CONFIGURATION_TYPE.bindTo(contextKeyService);
-		this.debugAdapterFactories = new Map();
 		if (previousSelectedLaunch) {
 			this.selectConfiguration(previousSelectedLaunch, this.storageService.get(DEBUG_SELECTED_CONFIG_NAME_KEY, StorageScope.WORKSPACE));
 		}