replace void 0 with undefined

build/gulpfile.vscode.js

@@ -171,13 +171,13 @@ const config = {
 		urlSchemes: [product.urlProtocol]
 	}],
 	darwinForceDarkModeSupport: true,
-	darwinCredits: darwinCreditsTemplate ? Buffer.from(darwinCreditsTemplate({ commit: commit, date: new Date().toISOString() })) : void 0,
+	darwinCredits: darwinCreditsTemplate ? Buffer.from(darwinCreditsTemplate({ commit: commit, date: new Date().toISOString() })) : undefined,
 	linuxExecutableName: product.applicationName,
 	winIcon: 'resources/win32/code.ico',
-	token: process.env['VSCODE_MIXIN_PASSWORD'] || process.env['GITHUB_TOKEN'] || void 0,
+	token: process.env['VSCODE_MIXIN_PASSWORD'] || process.env['GITHUB_TOKEN'] || undefined,
 
 	// @ts-ignore JSON checking: electronRepository is optional
-	repo: product.electronRepository || void 0
+	repo: product.electronRepository || undefined
 };
 
 function getElectron(arch) {

build/lib/git.ts

@@ -18,7 +18,7 @@ export function getVersion(repo: string): string | undefined {
 	try {
 		head = fs.readFileSync(headPath, 'utf8').trim();
 	} catch (e) {
-		return void 0;
+		return undefined;
 	}
 
 	if (/^[0-9a-f]{40}$/i.test(head)) {
@@ -28,7 +28,7 @@ export function getVersion(repo: string): string | undefined {
 	const refMatch = /^ref: (.*)$/.exec(head);
 
 	if (!refMatch) {
-		return void 0;
+		return undefined;
 	}
 
 	const ref = refMatch[1];
@@ -46,7 +46,7 @@ export function getVersion(repo: string): string | undefined {
 	try {
 		refsRaw = fs.readFileSync(packedRefsPath, 'utf8').trim();
 	} catch (e) {
-		return void 0;
+		return undefined;
 	}
 
 	const refsRegex = /^([0-9a-f]{40})\s+(.+)$/gm;

build/lib/watch/index.js

@@ -17,7 +17,7 @@ function handleDeletions() {
 	});
 }
 
-let watch = void 0;
+let watch = undefined;
 
 if (!watch) {
 	watch = process.platform === 'win32' ? require('./watch-win32') : require('gulp-watch');

extensions/css-language-features/server/src/cssServerMain.ts

@@ -126,7 +126,7 @@ function getDocumentSettings(textDocument: TextDocument): Thenable<LanguageSetti
 		}
 		return promise;
 	}
-	return Promise.resolve(void 0);
+	return Promise.resolve(undefined);
 }
 
 // The settings have changed. Is send on server activation as well.

extensions/css-language-features/server/src/languageModelCache.ts

@@ -15,7 +15,7 @@ export function getLanguageModelCache<T>(maxEntries: number, cleanupIntervalTime
 	let languageModels: { [uri: string]: { version: number, languageId: string, cTime: number, languageModel: T } } = {};
 	let nModels = 0;
 
-	let cleanupInterval: NodeJS.Timer | undefined = void 0;
+	let cleanupInterval: NodeJS.Timer | undefined = undefined;
 	if (cleanupIntervalTimeInSec > 0) {
 		cleanupInterval = setInterval(() => {
 			let cutoffTime = Date.now() - cleanupIntervalTimeInSec * 1000;
@@ -73,7 +73,7 @@ export function getLanguageModelCache<T>(maxEntries: number, cleanupIntervalTime
 		dispose() {
 			if (typeof cleanupInterval !== 'undefined') {
 				clearInterval(cleanupInterval);
-				cleanupInterval = void 0;
+				cleanupInterval = undefined;
 				languageModels = {};
 				nModels = 0;
 			}

extensions/css-language-features/server/src/utils/documentContext.ts

@@ -19,7 +19,7 @@ export function getDocumentContext(documentUri: string, workspaceFolders: Worksp
 				return folderURI;
 			}
 		}
-		return void 0;
+		return undefined;
 	}
 
 	return {

extensions/git/src/git.ts

@@ -114,17 +114,17 @@ function findGitWin32InPath(onLookup: (path: string) => void): Promise<IGit> {
 
 function findGitWin32(onLookup: (path: string) => void): Promise<IGit> {
 	return findSystemGitWin32(process.env['ProgramW6432'] as string, onLookup)
-		.then(void 0, () => findSystemGitWin32(process.env['ProgramFiles(x86)'] as string, onLookup))
-		.then(void 0, () => findSystemGitWin32(process.env['ProgramFiles'] as string, onLookup))
-		.then(void 0, () => findSystemGitWin32(path.join(process.env['LocalAppData'] as string, 'Programs'), onLookup))
-		.then(void 0, () => findGitWin32InPath(onLookup));
+		.then(undefined, () => findSystemGitWin32(process.env['ProgramFiles(x86)'] as string, onLookup))
+		.then(undefined, () => findSystemGitWin32(process.env['ProgramFiles'] as string, onLookup))
+		.then(undefined, () => findSystemGitWin32(path.join(process.env['LocalAppData'] as string, 'Programs'), onLookup))
+		.then(undefined, () => findGitWin32InPath(onLookup));
 }
 
 export function findGit(hint: string | undefined, onLookup: (path: string) => void): Promise<IGit> {
 	const first = hint ? findSpecificGit(hint, onLookup) : Promise.reject<IGit>(null);
 
 	return first
-		.then(void 0, () => {
+		.then(undefined, () => {
 			switch (process.platform) {
 				case 'darwin': return findGitDarwin(onLookup);
 				case 'win32': return findGitWin32(onLookup);
@@ -248,7 +248,7 @@ export class GitError {
 			this.error = data.error;
 			this.message = data.error.message;
 		} else {
-			this.error = void 0;
+			this.error = undefined;
 			this.message = '';
 		}
 
@@ -308,7 +308,7 @@ function getGitErrorCode(stderr: string): string | undefined {
 		return GitErrorCodes.InvalidBranchName;
 	}
 
-	return void 0;
+	return undefined;
 }
 
 export class Git {
@@ -1376,7 +1376,7 @@ export class Repository {
 				throw new Error('Not in a branch');
 			}
 
-			return { name: result.stdout.trim(), commit: void 0, type: RefType.Head };
+			return { name: result.stdout.trim(), commit: undefined, type: RefType.Head };
 		} catch (err) {
 			const result = await this.run(['rev-parse', 'HEAD']);
 
@@ -1384,7 +1384,7 @@ export class Repository {
 				throw new Error('Error parsing HEAD');
 			}
 
-			return { name: void 0, commit: result.stdout.trim(), type: RefType.Head };
+			return { name: undefined, commit: result.stdout.trim(), type: RefType.Head };
 		}
 	}
 

extensions/git/src/util.ts

@@ -69,7 +69,7 @@ export function anyEvent<T>(...events: Event<T>[]): Event<T> {
 }
 
 export function done<T>(promise: Promise<T>): Promise<void> {
-	return promise.then<void>(() => void 0);
+	return promise.then<void>(() => undefined);
 }
 
 export function onceEvent<T>(event: Event<T>): Event<T> {

extensions/html-language-features/client/src/tagClosing.ts

@@ -14,7 +14,7 @@ export function activateTagClosing(tagProvider: (document: TextDocument, positio
 	updateEnabledState();
 	window.onDidChangeActiveTextEditor(updateEnabledState, null, disposables);
 
-	let timeout: NodeJS.Timer | undefined = void 0;
+	let timeout: NodeJS.Timer | undefined = undefined;
 
 	function updateEnabledState() {
 		isEnabled = false;
@@ -26,7 +26,7 @@ export function activateTagClosing(tagProvider: (document: TextDocument, positio
 		if (!supportedLanguages[document.languageId]) {
 			return;
 		}
-		if (!workspace.getConfiguration(void 0, document.uri).get<boolean>(configName)) {
+		if (!workspace.getConfiguration(undefined, document.uri).get<boolean>(configName)) {
 			return;
 		}
 		isEnabled = true;
@@ -68,7 +68,7 @@ export function activateTagClosing(tagProvider: (document: TextDocument, positio
 					}
 				}
 			});
-			timeout = void 0;
+			timeout = undefined;
 		}, 100);
 	}
 	return Disposable.from(...disposables);

extensions/html-language-features/server/src/htmlServerMain.ts

@@ -75,7 +75,7 @@ function getDocumentSettings(textDocument: TextDocument, needsDocumentSettings:
 		}
 		return promise;
 	}
-	return Promise.resolve(void 0);
+	return Promise.resolve(undefined);
 }
 
 // After the server has started the client sends an initialize request. The server receives

extensions/html-language-features/server/src/languageModelCache.ts

@@ -15,7 +15,7 @@ export function getLanguageModelCache<T>(maxEntries: number, cleanupIntervalTime
 	let languageModels: { [uri: string]: { version: number, languageId: string, cTime: number, languageModel: T } } = {};
 	let nModels = 0;
 
-	let cleanupInterval: NodeJS.Timer | undefined = void 0;
+	let cleanupInterval: NodeJS.Timer | undefined = undefined;
 	if (cleanupIntervalTimeInSec > 0) {
 		cleanupInterval = setInterval(() => {
 			let cutoffTime = Date.now() - cleanupIntervalTimeInSec * 1000;
@@ -73,7 +73,7 @@ export function getLanguageModelCache<T>(maxEntries: number, cleanupIntervalTime
 		dispose() {
 			if (typeof cleanupInterval !== 'undefined') {
 				clearInterval(cleanupInterval);
-				cleanupInterval = void 0;
+				cleanupInterval = undefined;
 				languageModels = {};
 				nModels = 0;
 			}

extensions/html-language-features/server/src/modes/embeddedSupport.ts

@@ -59,7 +59,7 @@ export function getDocumentRegions(languageService: LanguageService, document: T
 					if (/["'](module|(text|application)\/(java|ecma)script)["']/.test(scanner.getTokenText())) {
 						languageIdFromType = 'javascript';
 					} else {
-						languageIdFromType = void 0;
+						languageIdFromType = undefined;
 					}
 				} else {
 					let attributeLanguageId = getAttributeLanguage(lastAttributeName!);

extensions/html-language-features/server/src/modes/htmlFolding.ts

@@ -54,7 +54,7 @@ function limitRanges(ranges: FoldingRange[], maxRanges: number) {
 
 	// compute each range's nesting level in 'nestingLevels'.
 	// count the number of ranges for each level in 'nestingLevelCounts'
-	let top: FoldingRange | undefined = void 0;
+	let top: FoldingRange | undefined = undefined;
 	let previous: FoldingRange[] = [];
 	let nestingLevels: number[] = [];
 	let nestingLevelCounts: number[] = [];

extensions/html-language-features/server/src/modes/javascriptMode.ts

@@ -58,7 +58,7 @@ export function getJavaScriptMode(documentRegions: LanguageModelCache<HTMLDocume
 			return {
 				getText: (start, end) => text.substring(start, end),
 				getLength: () => text.length,
-				getChangeRange: () => void 0
+				getChangeRange: () => undefined
 			};
 		},
 		getCurrentDirectory: () => '',

extensions/html-language-features/server/src/modes/languageModes.ts

@@ -91,7 +91,7 @@ export function getLanguageModes(supportedLanguages: { [languageId: string]: boo
 			if (languageId) {
 				return modes[languageId];
 			}
-			return void 0;
+			return undefined;
 		},
 		getModesInRange(document: TextDocument, range: Range): LanguageModeRange[] {
 			return documentRegions.get(document).getLanguageRanges(range).map(r => {

extensions/html-language-features/server/src/test/embedded.test.ts

@@ -89,7 +89,7 @@ suite('HTML Embedded Support', () => {
 		assertLanguageId('<script type="text/ecmascript">var| i = 0;</script>', 'javascript');
 		assertLanguageId('<script type="application/javascript">var| i = 0;</script>', 'javascript');
 		assertLanguageId('<script type="application/ecmascript">var| i = 0;</script>', 'javascript');
-		assertLanguageId('<script type="application/typescript">var| i = 0;</script>', void 0);
+		assertLanguageId('<script type="application/typescript">var| i = 0;</script>', undefined);
 		assertLanguageId('<script type=\'text/javascript\'>var| i = 0;</script>', 'javascript');
 	});
 

extensions/html-language-features/server/src/test/folding.test.ts

@@ -200,7 +200,7 @@ suite('HTML Folding', () => {
 			/*19*/' </span>',
 			/*20*/'</div>',
 		];
-		assertRanges(input, [r(0, 19), r(1, 18), r(2, 3), r(5, 11), r(6, 7), r(9, 10), r(13, 14), r(16, 17)], 'no limit', void 0);
+		assertRanges(input, [r(0, 19), r(1, 18), r(2, 3), r(5, 11), r(6, 7), r(9, 10), r(13, 14), r(16, 17)], 'no limit', undefined);
 		assertRanges(input, [r(0, 19), r(1, 18), r(2, 3), r(5, 11), r(6, 7), r(9, 10), r(13, 14), r(16, 17)], 'limit 8', 8);
 		assertRanges(input, [r(0, 19), r(1, 18), r(2, 3), r(5, 11), r(6, 7), r(13, 14), r(16, 17)], 'limit 7', 7);
 		assertRanges(input, [r(0, 19), r(1, 18), r(2, 3), r(5, 11), r(13, 14), r(16, 17)], 'limit 6', 6);

extensions/html-language-features/server/src/test/formatting.test.ts

@@ -38,7 +38,7 @@ suite('HTML Embedded Formatting', () => {
 			formatOptions = FormattingOptions.create(2, true);
 		}
 
-		let result = format(languageModes, document, range, formatOptions, void 0, { css: true, javascript: true });
+		let result = format(languageModes, document, range, formatOptions, undefined, { css: true, javascript: true });
 
 		let actual = TextDocument.applyEdits(document, result);
 		assert.equal(actual, expected, message);
@@ -67,8 +67,8 @@ suite('HTML Embedded Formatting', () => {
 
 	test('HTLM & Scripts - Fixtures', function () {
 		assertFormatWithFixture('19813.html', '19813.html');
-		assertFormatWithFixture('19813.html', '19813-4spaces.html', void 0, FormattingOptions.create(4, true));
-		assertFormatWithFixture('19813.html', '19813-tab.html', void 0, FormattingOptions.create(1, false));
+		assertFormatWithFixture('19813.html', '19813-4spaces.html', undefined, FormattingOptions.create(4, true));
+		assertFormatWithFixture('19813.html', '19813-tab.html', undefined, FormattingOptions.create(1, false));
 		assertFormatWithFixture('21634.html', '21634.html');
 	});
 

extensions/html-language-features/server/src/utils/documentContext.ts

@@ -19,7 +19,7 @@ export function getDocumentContext(documentUri: string, workspaceFolders: Worksp
 				return folderURI;
 			}
 		}
-		return void 0;
+		return undefined;
 	}
 
 	return {

extensions/json-language-features/client/src/jsonMain.ts

@@ -338,7 +338,7 @@ function getPackageInfo(context: ExtensionContext): IPackageInfo | undefined {
 			aiKey: extensionPackage.aiKey
 		};
 	}
-	return void 0;
+	return undefined;
 }
 
 function readJSONFile(location: string) {

extensions/json-language-features/server/src/jsonServerMain.ts

@@ -143,7 +143,7 @@ connection.onInitialize((params: InitializeParams): InitializeResult => {
 	const capabilities: ServerCapabilities = {
 		// Tell the client that the server works in FULL text document sync mode
 		textDocumentSync: documents.syncKind,
-		completionProvider: clientSnippetSupport ? { resolveProvider: true, triggerCharacters: ['"', ':'] } : void 0,
+		completionProvider: clientSnippetSupport ? { resolveProvider: true, triggerCharacters: ['"', ':'] } : undefined,
 		hoverProvider: true,
 		documentSymbolProvider: true,
 		documentRangeFormattingProvider: false,
@@ -174,8 +174,8 @@ interface JSONSchemaSettings {
 	schema?: JSONSchema;
 }
 
-let jsonConfigurationSettings: JSONSchemaSettings[] | undefined = void 0;
-let schemaAssociations: ISchemaAssociations | undefined = void 0;
+let jsonConfigurationSettings: JSONSchemaSettings[] | undefined = undefined;
+let schemaAssociations: ISchemaAssociations | undefined = undefined;
 let formatterRegistration: Thenable<Disposable> | null = null;
 
 // The settings have changed. Is send on server activation as well.

extensions/json-language-features/server/src/languageModelCache.ts

@@ -15,7 +15,7 @@ export function getLanguageModelCache<T>(maxEntries: number, cleanupIntervalTime
 	let languageModels: { [uri: string]: { version: number, languageId: string, cTime: number, languageModel: T } } = {};
 	let nModels = 0;
 
-	let cleanupInterval: NodeJS.Timer | undefined = void 0;
+	let cleanupInterval: NodeJS.Timer | undefined = undefined;
 	if (cleanupIntervalTimeInSec > 0) {
 		cleanupInterval = setInterval(() => {
 			let cutoffTime = Date.now() - cleanupIntervalTimeInSec * 1000;
@@ -73,7 +73,7 @@ export function getLanguageModelCache<T>(maxEntries: number, cleanupIntervalTime
 		dispose() {
 			if (typeof cleanupInterval !== 'undefined') {
 				clearInterval(cleanupInterval);
-				cleanupInterval = void 0;
+				cleanupInterval = undefined;
 				languageModels = {};
 				nModels = 0;
 			}

extensions/markdown-language-features/src/commands/openDocumentLink.ts

@@ -39,9 +39,9 @@ export class OpenDocumentLinkCommand implements Command {
 				return this.tryOpen(p + '.md', args);
 			}
 			const resource = vscode.Uri.file(p);
-			return Promise.resolve(void 0)
+			return Promise.resolve(undefined)
 				.then(() => vscode.commands.executeCommand('vscode.open', resource))
-				.then(() => void 0);
+				.then(() => undefined);
 		});
 	}
 

extensions/npm/src/features/bowerJSONContribution.ts

@@ -175,9 +175,9 @@ export class BowerJSONContribution implements IJSONContribution {
 			} catch (e) {
 				// ignore
 			}
-			return void 0;
+			return undefined;
 		}, () => {
-			return void 0;
+			return undefined;
 		});
 	}
 

extensions/php-language-features/src/features/validationProvider.ts

@@ -146,7 +146,7 @@ export default class PHPValidationProvider {
 			}
 			this.trigger = RunTrigger.from(section.get<string>('validate.run', RunTrigger.strings.onSave));
 		}
-		if (this.executableIsUserDefined !== true && this.workspaceStore.get<string | undefined>(CheckedExecutablePath, undefined) !== void 0) {
+		if (this.executableIsUserDefined !== true && this.workspaceStore.get<string | undefined>(CheckedExecutablePath, undefined) !== undefined) {
 			vscode.commands.executeCommand('setContext', 'php.untrustValidationExecutableContext', true);
 		}
 		this.delayers = Object.create(null);
@@ -195,7 +195,7 @@ export default class PHPValidationProvider {
 			delayer.trigger(() => this.doValidate(textDocument));
 		};
 
-		if (this.executableIsUserDefined !== void 0 && !this.executableIsUserDefined) {
+		if (this.executableIsUserDefined !== undefined && !this.executableIsUserDefined) {
 			let checkedExecutablePath = this.workspaceStore.get<string | undefined>(CheckedExecutablePath, undefined);
 			if (!checkedExecutablePath || checkedExecutablePath !== this.executable) {
 				vscode.window.showInformationMessage<MessageItem>(

extensions/typescript-language-features/src/features/bufferSyncSupport.ts

@@ -124,7 +124,7 @@ class PendingDiagnostics extends ResourceMap<number> {
 
 		const map = new ResourceMap<void>();
 		for (const resource of orderedResources) {
-			map.set(resource, void 0);
+			map.set(resource, undefined);
 		}
 		return map;
 	}
@@ -355,7 +355,7 @@ export default class BufferSyncSupport extends Disposable {
 
 		// Add all open TS buffers to the geterr request. They might be visible
 		for (const buffer of this.syncedBuffers.values) {
-			orderedFileSet.set(buffer.resource, void 0);
+			orderedFileSet.set(buffer.resource, undefined);
 		}
 
 		if (orderedFileSet.size) {
@@ -363,7 +363,7 @@ export default class BufferSyncSupport extends Disposable {
 				this.pendingGetErr.cancel();
 
 				for (const file of this.pendingGetErr.files.entries) {
-					orderedFileSet.set(file.resource, void 0);
+					orderedFileSet.set(file.resource, undefined);
 				}
 			}
 

extensions/vscode-api-tests/src/singlefolder-tests/commands.test.ts

@@ -101,17 +101,17 @@ suite('commands namespace tests', () => {
 
 
 		let a = commands.executeCommand('vscode.diff', Uri.parse('sc:a'), Uri.parse('sc:b'), 'DIFF').then(value => {
-			assert.ok(value === void 0);
+			assert.ok(value === undefined);
 			registration.dispose();
 		});
 
 		let b = commands.executeCommand('vscode.diff', Uri.parse('sc:a'), Uri.parse('sc:b')).then(value => {
-			assert.ok(value === void 0);
+			assert.ok(value === undefined);
 			registration.dispose();
 		});
 
 		let c = commands.executeCommand('vscode.diff', Uri.parse('sc:a'), Uri.parse('sc:b'), 'Title', { selection: new Range(new Position(1, 1), new Position(1, 2)) }).then(value => {
-			assert.ok(value === void 0);
+			assert.ok(value === undefined);
 			registration.dispose();
 		});
 

src/bootstrap-window.js

@@ -185,7 +185,7 @@ function registerDeveloperKeybindings() {
 	return function () {
 		if (listener) {
 			window.removeEventListener('keydown', listener);
-			listener = void 0;
+			listener = undefined;
 		}
 	};
 }

src/main.js

@@ -414,7 +414,7 @@ function rimraf(location) {
 		}
 	}, err => {
 		if (err.code === 'ENOENT') {
-			return void 0;
+			return undefined;
 		}
 		throw err;
 	});

src/vs/base/browser/dom.ts

@@ -147,10 +147,10 @@ const _manualClassList = new class implements IDomClassList {
 
 	toggleClass(node: HTMLElement, className: string, shouldHaveIt?: boolean): void {
 		this._findClassName(node, className);
-		if (this._lastStart !== -1 && (shouldHaveIt === void 0 || !shouldHaveIt)) {
+		if (this._lastStart !== -1 && (shouldHaveIt === undefined || !shouldHaveIt)) {
 			this.removeClass(node, className);
 		}
-		if (this._lastStart === -1 && (shouldHaveIt === void 0 || shouldHaveIt)) {
+		if (this._lastStart === -1 && (shouldHaveIt === undefined || shouldHaveIt)) {
 			this.addClass(node, className);
 		}
 	}

src/vs/base/browser/ui/actionbar/actionbar.ts

@@ -60,24 +60,24 @@ export class BaseActionItem extends Disposable implements IActionItem {
 	}
 
 	private handleActionChangeEvent(event: IActionChangeEvent): void {
-		if (event.enabled !== void 0) {
+		if (event.enabled !== undefined) {
 			this.updateEnabled();
 		}
 
-		if (event.checked !== void 0) {
+		if (event.checked !== undefined) {
 			this.updateChecked();
 		}
 
-		if (event.class !== void 0) {
+		if (event.class !== undefined) {
 			this.updateClass();
 		}
 
-		if (event.label !== void 0) {
+		if (event.label !== undefined) {
 			this.updateLabel();
 			this.updateTooltip();
 		}
 
-		if (event.tooltip !== void 0) {
+		if (event.tooltip !== undefined) {
 			this.updateTooltip();
 		}
 	}
@@ -679,7 +679,7 @@ export class ActionBar extends Disposable implements IActionRunner {
 	focus(selectFirst?: boolean): void;
 	focus(arg?: any): void {
 		let selectFirst: boolean = false;
-		let index: number | undefined = void 0;
+		let index: number | undefined = undefined;
 		if (arg === undefined) {
 			selectFirst = true;
 		} else if (typeof arg === 'number') {

src/vs/base/browser/ui/iconLabel/iconLabel.ts

@@ -132,7 +132,7 @@ export class IconLabel extends Disposable {
 		this.domNode.title = options && options.title ? options.title : '';
 
 		if (this.labelNode instanceof HighlightedLabel) {
-			this.labelNode.set(label || '', options ? options.matches : void 0, options && options.title ? options.title : void 0, options && options.labelEscapeNewLines);
+			this.labelNode.set(label || '', options ? options.matches : undefined, options && options.title ? options.title : undefined, options && options.labelEscapeNewLines);
 		} else {
 			this.labelNode.textContent = label || '';
 		}
@@ -143,7 +143,7 @@ export class IconLabel extends Disposable {
 			}
 
 			if (this.descriptionNode instanceof HighlightedLabel) {
-				this.descriptionNode.set(description || '', options ? options.descriptionMatches : void 0);
+				this.descriptionNode.set(description || '', options ? options.descriptionMatches : undefined);
 				if (options && options.descriptionTitle) {
 					this.descriptionNode.element.title = options.descriptionTitle;
 				} else {

src/vs/base/browser/ui/scrollbar/horizontalScrollbar.ts

@@ -34,8 +34,8 @@ export class HorizontalScrollbar extends AbstractScrollbar {
 				className: 'left-arrow',
 				top: scrollbarDelta,
 				left: arrowDelta,
-				bottom: void 0,
-				right: void 0,
+				bottom: undefined,
+				right: undefined,
 				bgWidth: options.arrowSize,
 				bgHeight: options.horizontalScrollbarSize,
 				onActivate: () => this._host.onMouseWheel(new StandardWheelEvent(null, 1, 0)),
@@ -44,8 +44,8 @@ export class HorizontalScrollbar extends AbstractScrollbar {
 			this._createArrow({
 				className: 'right-arrow',
 				top: scrollbarDelta,
-				left: void 0,
-				bottom: void 0,
+				left: undefined,
+				bottom: undefined,
 				right: arrowDelta,
 				bgWidth: options.arrowSize,
 				bgHeight: options.horizontalScrollbarSize,

src/vs/base/browser/ui/scrollbar/verticalScrollbar.ts

@@ -35,8 +35,8 @@ export class VerticalScrollbar extends AbstractScrollbar {
 				className: 'up-arrow',
 				top: arrowDelta,
 				left: scrollbarDelta,
-				bottom: void 0,
-				right: void 0,
+				bottom: undefined,
+				right: undefined,
 				bgWidth: options.verticalScrollbarSize,
 				bgHeight: options.arrowSize,
 				onActivate: () => this._host.onMouseWheel(new StandardWheelEvent(null, 0, 1)),
@@ -44,10 +44,10 @@ export class VerticalScrollbar extends AbstractScrollbar {
 
 			this._createArrow({
 				className: 'down-arrow',
-				top: void 0,
+				top: undefined,
 				left: scrollbarDelta,
 				bottom: arrowDelta,
-				right: void 0,
+				right: undefined,
 				bgWidth: options.verticalScrollbarSize,
 				bgHeight: options.arrowSize,
 				onActivate: () => this._host.onMouseWheel(new StandardWheelEvent(null, 0, -1)),

src/vs/base/browser/ui/toolbar/toolbar.ts

@@ -133,9 +133,9 @@ export class ToolBar extends Disposable {
 	}
 
 	private getKeybindingLabel(action: IAction): string | undefined {
-		const key = this.lookupKeybindings && this.options.getKeyBinding ? this.options.getKeyBinding(action) : void 0;
+		const key = this.lookupKeybindings && this.options.getKeyBinding ? this.options.getKeyBinding(action) : undefined;
 
-		return (key && key.getLabel()) || void 0;
+		return (key && key.getLabel()) || undefined;
 	}
 
 	addPrimaryAction(primaryAction: IAction): () => void {
@@ -157,7 +157,7 @@ export class ToolBar extends Disposable {
 	dispose(): void {
 		if (this.toggleMenuActionItem) {
 			this.toggleMenuActionItem.dispose();
-			this.toggleMenuActionItem = void 0;
+			this.toggleMenuActionItem = undefined;
 		}
 
 		super.dispose();
@@ -173,7 +173,7 @@ class ToggleMenuAction extends Action {
 
 	constructor(toggleDropdownMenu: () => void, title?: string) {
 		title = title || nls.localize('moreActions', "More Actions...");
-		super(ToggleMenuAction.ID, title, void 0, true);
+		super(ToggleMenuAction.ID, title, undefined, true);
 
 		this.toggleDropdownMenu = toggleDropdownMenu;
 	}

src/vs/base/common/decorators.ts

@@ -71,7 +71,7 @@ export function debounce<T>(delay: number, reducer?: IDebouceReducer<T>, initial
 
 		return function (this: any, ...args: any[]) {
 			if (!this[resultKey]) {
-				this[resultKey] = initialValueProvider ? initialValueProvider() : void 0;
+				this[resultKey] = initialValueProvider ? initialValueProvider() : undefined;
 			}
 
 			clearTimeout(this[timerKey]);
@@ -83,7 +83,7 @@ export function debounce<T>(delay: number, reducer?: IDebouceReducer<T>, initial
 
 			this[timerKey] = setTimeout(() => {
 				fn.apply(this, args);
-				this[resultKey] = initialValueProvider ? initialValueProvider() : void 0;
+				this[resultKey] = initialValueProvider ? initialValueProvider() : undefined;
 			}, delay);
 		};
 	});

src/vs/base/common/event.ts

@@ -727,7 +727,7 @@ export class EventBufferer {
 				} else {
 					listener.call(thisArgs, i);
 				}
-			}, void 0, disposables);
+			}, undefined, disposables);
 		};
 	}
 

src/vs/base/common/htmlContent.ts

@@ -58,7 +58,7 @@ export function isMarkdownString(thing: any): thing is IMarkdownString {
 		return true;
 	} else if (thing && typeof thing === 'object') {
 		return typeof (<IMarkdownString>thing).value === 'string'
-			&& (typeof (<IMarkdownString>thing).isTrusted === 'boolean' || (<IMarkdownString>thing).isTrusted === void 0);
+			&& (typeof (<IMarkdownString>thing).isTrusted === 'boolean' || (<IMarkdownString>thing).isTrusted === undefined);
 	}
 	return false;
 }

src/vs/base/common/json.ts

@@ -722,13 +722,13 @@ interface NodeImpl extends Node {
 export function getLocation(text: string, position: number): Location {
 	let segments: Segment[] = []; // strings or numbers
 	let earlyReturnException = new Object();
-	let previousNode: NodeImpl | undefined = void 0;
+	let previousNode: NodeImpl | undefined = undefined;
 	const previousNodeInst: NodeImpl = {
 		value: {},
 		offset: 0,
 		length: 0,
 		type: 'object',
-		parent: void 0
+		parent: undefined
 	};
 	let isAtPropertyKey = false;
 	function setPreviousNode(value: string, offset: number, length: number, type: NodeType) {
@@ -736,7 +736,7 @@ export function getLocation(text: string, position: number): Location {
 		previousNodeInst.offset = offset;
 		previousNodeInst.length = length;
 		previousNodeInst.type = type;
-		previousNodeInst.colonOffset = void 0;
+		previousNodeInst.colonOffset = undefined;
 		previousNode = previousNodeInst;
 	}
 	try {
@@ -746,7 +746,7 @@ export function getLocation(text: string, position: number): Location {
 				if (position <= offset) {
 					throw earlyReturnException;
 				}
-				previousNode = void 0;
+				previousNode = undefined;
 				isAtPropertyKey = position > offset;
 				segments.push(''); // push a placeholder (will be replaced)
 			},
@@ -764,21 +764,21 @@ export function getLocation(text: string, position: number): Location {
 				if (position <= offset) {
 					throw earlyReturnException;
 				}
-				previousNode = void 0;
+				previousNode = undefined;
 				segments.pop();
 			},
 			onArrayBegin: (offset: number, length: number) => {
 				if (position <= offset) {
 					throw earlyReturnException;
 				}
-				previousNode = void 0;
+				previousNode = undefined;
 				segments.push(0);
 			},
 			onArrayEnd: (offset: number, length: number) => {
 				if (position <= offset) {
 					throw earlyReturnException;
 				}
-				previousNode = void 0;
+				previousNode = undefined;
 				segments.pop();
 			},
 			onLiteralValue: (value: any, offset: number, length: number) => {
@@ -798,7 +798,7 @@ export function getLocation(text: string, position: number): Location {
 				if (sep === ':' && previousNode && previousNode.type === 'property') {
 					previousNode.colonOffset = offset;
 					isAtPropertyKey = false;
-					previousNode = void 0;
+					previousNode = undefined;
 				} else if (sep === ',') {
 					let last = segments[segments.length - 1];
 					if (typeof last === 'number') {
@@ -807,7 +807,7 @@ export function getLocation(text: string, position: number): Location {
 						isAtPropertyKey = true;
 						segments[segments.length - 1] = '';
 					}
-					previousNode = void 0;
+					previousNode = undefined;
 				}
 			}
 		});
@@ -891,7 +891,7 @@ export function parse(text: string, errors: ParseError[] = [], options: ParseOpt
  * Parses the given text and returns a tree representation the JSON content. On invalid input, the parser tries to be as fault tolerant as possible, but still return a result.
  */
 export function parseTree(text: string, errors: ParseError[] = [], options: ParseOptions = ParseOptions.DEFAULT): Node {
-	let currentParent: NodeImpl = { type: 'array', offset: -1, length: -1, children: [], parent: void 0 }; // artificial root
+	let currentParent: NodeImpl = { type: 'array', offset: -1, length: -1, children: [], parent: undefined }; // artificial root
 
 	function ensurePropertyComplete(endOffset: number) {
 		if (currentParent.type === 'property') {
@@ -957,13 +957,13 @@ export function parseTree(text: string, errors: ParseError[] = [], options: Pars
  */
 export function findNodeAtLocation(root: Node, path: JSONPath): Node | undefined {
 	if (!root) {
-		return void 0;
+		return undefined;
 	}
 	let node = root;
 	for (let segment of path) {
 		if (typeof segment === 'string') {
 			if (node.type !== 'object' || !Array.isArray(node.children)) {
-				return void 0;
+				return undefined;
 			}
 			let found = false;
 			for (const propertyNode of node.children) {
@@ -974,12 +974,12 @@ export function findNodeAtLocation(root: Node, path: JSONPath): Node | undefined
 				}
 			}
 			if (!found) {
-				return void 0;
+				return undefined;
 			}
 		} else {
 			let index = <number>segment;
 			if (node.type !== 'array' || index < 0 || !Array.isArray(node.children) || index >= node.children.length) {
-				return void 0;
+				return undefined;
 			}
 			node = node.children[index];
 		}
@@ -1029,7 +1029,7 @@ export function getNodeValue(node: Node): any {
 		case 'boolean':
 			return node.value;
 		default:
-			return void 0;
+			return undefined;
 	}
 
 }
@@ -1055,7 +1055,7 @@ export function findNodeAtOffset(node: Node, offset: number, includeRightBound =
 		}
 		return node;
 	}
-	return void 0;
+	return undefined;
 }
 
 
@@ -1322,7 +1322,7 @@ export function stripComments(text: string, replaceCh?: string): string {
 				if (offset !== pos) {
 					parts.push(text.substring(offset, pos));
 				}
-				if (replaceCh !== void 0) {
+				if (replaceCh !== undefined) {
 					parts.push(_scanner.getTokenValue().replace(/[^\r\n]/g, replaceCh));
 				}
 				offset = _scanner.getPosition();

src/vs/base/common/jsonEdit.ts

@@ -8,20 +8,20 @@ import { Edit, format, isEOL, FormattingOptions } from './jsonFormatter';
 
 
 export function removeProperty(text: string, path: JSONPath, formattingOptions: FormattingOptions): Edit[] {
-	return setProperty(text, path, void 0, formattingOptions);
+	return setProperty(text, path, undefined, formattingOptions);
 }
 
 export function setProperty(text: string, originalPath: JSONPath, value: any, formattingOptions: FormattingOptions, getInsertionIndex?: (properties: string[]) => number): Edit[] {
 	let path = originalPath.slice();
 	let errors: ParseError[] = [];
 	let root = parseTree(text, errors);
-	let parent: Node | undefined = void 0;
+	let parent: Node | undefined = undefined;
 
-	let lastSegment: Segment | undefined = void 0;
+	let lastSegment: Segment | undefined = undefined;
 	while (path.length > 0) {
 		lastSegment = path.pop();
 		parent = findNodeAtLocation(root, path);
-		if (parent === void 0 && value !== void 0) {
+		if (parent === undefined && value !== undefined) {
 			if (typeof lastSegment === 'string') {
 				value = { [lastSegment]: value };
 			} else {
@@ -34,14 +34,14 @@ export function setProperty(text: string, originalPath: JSONPath, value: any, fo
 
 	if (!parent) {
 		// empty document
-		if (value === void 0) { // delete
+		if (value === undefined) { // delete
 			throw new Error('Can not delete in empty document');
 		}
 		return withFormatting(text, { offset: root ? root.offset : 0, length: root ? root.length : 0, content: JSON.stringify(value) }, formattingOptions);
 	} else if (parent.type === 'object' && typeof lastSegment === 'string' && Array.isArray(parent.children)) {
 		let existing = findNodeAtLocation(parent, [lastSegment]);
-		if (existing !== void 0) {
-			if (value === void 0) { // delete
+		if (existing !== undefined) {
+			if (value === undefined) { // delete
 				if (!existing.parent) {
 					throw new Error('Malformed AST');
 				}
@@ -66,7 +66,7 @@ export function setProperty(text: string, originalPath: JSONPath, value: any, fo
 				return withFormatting(text, { offset: existing.offset, length: existing.length, content: JSON.stringify(value) }, formattingOptions);
 			}
 		} else {
-			if (value === void 0) { // delete
+			if (value === undefined) { // delete
 				return []; // property does not exist, nothing to do
 			}
 			let newProperty = `${JSON.stringify(lastSegment)}: ${JSON.stringify(value)}`;
@@ -96,7 +96,7 @@ export function setProperty(text: string, originalPath: JSONPath, value: any, fo
 			}
 			return withFormatting(text, edit, formattingOptions);
 		} else {
-			if (value === void 0 && parent.children.length >= 0) {
+			if (value === undefined && parent.children.length >= 0) {
 				//Removal
 				let removalIndex = lastSegment;
 				let toRemove = parent.children[removalIndex];

src/vs/base/common/labels.ts

@@ -110,7 +110,7 @@ export function tildify(path: string, userHome: string): string {
 	}
 
 	// Keep a normalized user home path as cache to prevent accumulated string creation
-	let normalizedUserHome = normalizedUserHomeCached.original === userHome ? normalizedUserHomeCached.normalized : void 0;
+	let normalizedUserHome = normalizedUserHomeCached.original === userHome ? normalizedUserHomeCached.normalized : undefined;
 	if (!normalizedUserHome) {
 		normalizedUserHome = `${rtrim(userHome, sep)}${sep}`;
 		normalizedUserHomeCached = { original: userHome, normalized: normalizedUserHome };

src/vs/base/common/map.ts

@@ -24,7 +24,7 @@ export function keys<K, V>(map: Map<K, V>): K[] {
 
 export function getOrSet<K, V>(map: Map<K, V>, key: K, value: V): V {
 	let result = map.get(key);
-	if (result === void 0) {
+	if (result === undefined) {
 		result = value;
 		map.set(key, result);
 	}
@@ -687,7 +687,7 @@ export class LinkedMap<K, V> {
 		this._head = current;
 		this._size = currentSize;
 		if (current) {
-			current.previous = void 0;
+			current.previous = undefined;
 		}
 	}
 
@@ -719,8 +719,8 @@ export class LinkedMap<K, V> {
 
 	private removeItem(item: Item<K, V>): void {
 		if (item === this._head && item === this._tail) {
-			this._head = void 0;
-			this._tail = void 0;
+			this._head = undefined;
+			this._tail = undefined;
 		}
 		else if (item === this._head) {
 			this._head = item.next;
@@ -759,7 +759,7 @@ export class LinkedMap<K, V> {
 			if (item === this._tail) {
 				// previous must be defined since item was not head but is tail
 				// So there are more than on item in the map
-				previous!.next = void 0;
+				previous!.next = undefined;
 				this._tail = previous;
 			}
 			else {
@@ -769,7 +769,7 @@ export class LinkedMap<K, V> {
 			}
 
 			// Insert the node at head
-			item.previous = void 0;
+			item.previous = undefined;
 			item.next = this._head;
 			this._head.previous = item;
 			this._head = item;
@@ -785,14 +785,14 @@ export class LinkedMap<K, V> {
 			if (item === this._head) {
 				// next must be defined since item was not tail but is head
 				// So there are more than on item in the map
-				next!.previous = void 0;
+				next!.previous = undefined;
 				this._head = next;
 			} else {
 				// Both next and previous are not undefined since item was neither head nor tail.
 				next!.previous = previous;
 				previous!.next = next;
 			}
-			item.next = void 0;
+			item.next = undefined;
 			item.previous = this._tail;
 			this._tail.next = item;
 			this._tail = item;

src/vs/base/common/mime.ts

@@ -82,9 +82,9 @@ function toTextMimeAssociationItem(association: ITextMimeAssociation): ITextMime
 		filepattern: association.filepattern,
 		firstline: association.firstline,
 		userConfigured: association.userConfigured,
-		filenameLowercase: association.filename ? association.filename.toLowerCase() : void 0,
-		extensionLowercase: association.extension ? association.extension.toLowerCase() : void 0,
-		filepatternLowercase: association.filepattern ? association.filepattern.toLowerCase() : void 0,
+		filenameLowercase: association.filename ? association.filename.toLowerCase() : undefined,
+		extensionLowercase: association.extension ? association.extension.toLowerCase() : undefined,
+		filepatternLowercase: association.filepattern ? association.filepattern.toLowerCase() : undefined,
 		filepatternOnPath: association.filepattern ? association.filepattern.indexOf(paths.sep) >= 0 : false
 	};
 }

src/vs/base/common/paths.ts

@@ -77,7 +77,7 @@ export function normalize(path: null, toOSPath?: boolean): null;
 export function normalize(path: string, toOSPath?: boolean): string;
 export function normalize(path: string | null | undefined, toOSPath?: boolean): string | null | undefined {
 
-	if (path === null || path === void 0) {
+	if (path === null || path === undefined) {
 		return path;
 	}
 

src/vs/base/common/performance.js

@@ -43,7 +43,7 @@ define([], function () {
 		const result = [];
 		const entries = global._performanceEntries;
 		for (let i = 0; i < entries.length; i += 5) {
-			if (entries[i] === type && (name === void 0 || entries[i + 1] === name)) {
+			if (entries[i] === type && (name === undefined || entries[i + 1] === name)) {
 				result.push({
 					type: entries[i],
 					name: entries[i + 1],

src/vs/base/common/resources.ts

@@ -186,7 +186,7 @@ export function isMalformedFileUri(candidate: URI): URI | undefined {
 	if (!candidate.scheme || isWindows && candidate.scheme.match(/^[a-zA-Z]$/)) {
 		return URI.file((candidate.scheme ? candidate.scheme + ':' : '') + candidate.path);
 	}
-	return void 0;
+	return undefined;
 }
 
 

src/vs/base/common/uri.ts

@@ -215,27 +215,27 @@ export class URI implements UriComponents {
 		}
 
 		let { scheme, authority, path, query, fragment } = change;
-		if (scheme === void 0) {
+		if (scheme === undefined) {
 			scheme = this.scheme;
 		} else if (scheme === null) {
 			scheme = _empty;
 		}
-		if (authority === void 0) {
+		if (authority === undefined) {
 			authority = this.authority;
 		} else if (authority === null) {
 			authority = _empty;
 		}
-		if (path === void 0) {
+		if (path === undefined) {
 			path = this.path;
 		} else if (path === null) {
 			path = _empty;
 		}
-		if (query === void 0) {
+		if (query === undefined) {
 			query = this.query;
 		} else if (query === null) {
 			query = _empty;
 		}
-		if (fragment === void 0) {
+		if (fragment === undefined) {
 			fragment = this.fragment;
 		} else if (fragment === null) {
 			fragment = _empty;

src/vs/base/node/console.ts

@@ -83,7 +83,7 @@ export function getFirstFrame(arg0: IRemoteConsoleLog | string | undefined): ISt
 		}
 	}
 
-	return void 0;
+	return undefined;
 }
 
 function findFirstFrame(stack: string | undefined): string | undefined {

src/vs/base/node/encoding.ts

@@ -401,7 +401,7 @@ export function resolveTerminalEncoding(verbose?: boolean): Promise<string> {
 					}
 				}
 
-				return resolve(void 0);
+				return resolve(undefined);
 			});
 		});
 	}

src/vs/base/node/extfs.ts

@@ -128,7 +128,7 @@ function doCopyFile(source: string, target: string, mode: number, callback: (err
 
 export function mkdirp(path: string, mode?: number, token?: CancellationToken): Promise<boolean> {
 	const mkdir = (): Promise<null> => {
-		return nfcall(fs.mkdir, path, mode).then(void 0, (mkdirErr: NodeJS.ErrnoException) => {
+		return nfcall(fs.mkdir, path, mode).then(undefined, (mkdirErr: NodeJS.ErrnoException) => {
 
 			// ENOENT: a parent folder does not exist yet
 			if (mkdirErr.code === 'ENOENT') {
@@ -155,7 +155,7 @@ export function mkdirp(path: string, mode?: number, token?: CancellationToken):
 	}
 
 	// recursively mkdir
-	return mkdir().then(void 0, (err: NodeJS.ErrnoException) => {
+	return mkdir().then(undefined, (err: NodeJS.ErrnoException) => {
 
 		// Respect cancellation
 		if (token && token.isCancellationRequested) {

src/vs/base/node/pfs.ts

@@ -36,7 +36,7 @@ export function rimraf(path: string): Promise<void> {
 		}
 	}, (err: NodeJS.ErrnoException) => {
 		if (err.code === 'ENOENT') {
-			return void 0;
+			return undefined;
 		}
 
 		return Promise.reject(err);
@@ -194,7 +194,7 @@ export function whenDeleted(path: string): Promise<void> {
 
 					if (!exists) {
 						clearInterval(interval);
-						resolve(void 0);
+						resolve(undefined);
 					}
 				});
 			}

src/vs/base/node/processes.ts

@@ -107,7 +107,7 @@ export abstract class AbstractProcess<TProgressData> {
 	public constructor(executable: Executable);
 	public constructor(cmd: string, args: string[] | undefined, shell: boolean, options: CommandOptions | undefined);
 	public constructor(arg1: string | Executable, arg2?: string[], arg3?: boolean, arg4?: CommandOptions) {
-		if (arg2 !== void 0 && arg3 !== void 0 && arg4 !== void 0) {
+		if (arg2 !== undefined && arg3 !== undefined && arg4 !== undefined) {
 			this.cmd = <string>arg1;
 			this.args = arg2;
 			this.shell = arg3;
@@ -409,7 +409,7 @@ export namespace win32 {
 		if (path.isAbsolute(command)) {
 			return command;
 		}
-		if (cwd === void 0) {
+		if (cwd === undefined) {
 			cwd = process.cwd();
 		}
 		let dir = path.dirname(command);
@@ -418,11 +418,11 @@ export namespace win32 {
 			// to the current working directory.
 			return path.join(cwd, command);
 		}
-		if (paths === void 0 && Types.isString(process.env.PATH)) {
+		if (paths === undefined && Types.isString(process.env.PATH)) {
 			paths = process.env.PATH.split(path.delimiter);
 		}
 		// No PATH environment. Make path absolute to the cwd.
-		if (paths === void 0 || paths.length === 0) {
+		if (paths === undefined || paths.length === 0) {
 			return path.join(cwd, command);
 		}
 		// We have a simple file name. We get the path variable from the env

src/vs/base/node/request.ts

@@ -136,7 +136,7 @@ export function download(filePath: string, context: IRequestContext): Promise<vo
 	return new Promise<void>((c, e) => {
 		const out = createWriteStream(filePath);
 
-		out.once('finish', () => c(void 0));
+		out.once('finish', () => c(undefined));
 		context.stream.once('error', e);
 		context.stream.pipe(out);
 	});

src/vs/base/parts/contextmenu/electron-main/contextmenu.ts

@@ -12,9 +12,9 @@ export function registerContextMenuListener(): void {
 
 		menu.popup({
 			window: BrowserWindow.fromWebContents(event.sender),
-			x: options ? options.x : void 0,
-			y: options ? options.y : void 0,
-			positioningItem: options ? options.positioningItem : void 0,
+			x: options ? options.x : undefined,
+			y: options ? options.y : undefined,
+			positioningItem: options ? options.positioningItem : undefined,
 			callback: () => {
 				event.sender.send(CONTEXT_MENU_CLOSE_CHANNEL, contextMenuId);
 			}

src/vs/base/parts/ipc/node/ipc.ts

@@ -309,7 +309,7 @@ export class ChannelServer<TContext = string> implements IChannelServer<TContext
 					id, data: {
 						message: err.message,
 						name: err.name,
-						stack: err.stack ? (err.stack.split ? err.stack.split('\n') : err.stack) : void 0
+						stack: err.stack ? (err.stack.split ? err.stack.split('\n') : err.stack) : undefined
 					}, type: ResponseType.PromiseError
 				});
 			} else {

src/vs/base/parts/ipc/test/node/ipc.cp.test.ts

@@ -39,7 +39,7 @@ suite('IPC, Child Process', () => {
 			service.onMarco(({ answer }) => {
 				try {
 					assert.equal(answer, 'polo');
-					c(void 0);
+					c(undefined);
 				} catch (err) {
 					e(err);
 				}

src/vs/base/parts/ipc/test/node/ipc.net.test.ts

@@ -47,7 +47,7 @@ suite('IPC, Socket Protocol', () => {
 			const sub = b.onMessage(data => {
 				sub.dispose();
 				assert.equal(data.toString(), 'foobarfarboo');
-				resolve(void 0);
+				resolve(undefined);
 			});
 			a.send(Buffer.from('foobarfarboo'));
 		});
@@ -55,7 +55,7 @@ suite('IPC, Socket Protocol', () => {
 			const sub_1 = b.onMessage(data => {
 				sub_1.dispose();
 				assert.equal(data.readInt8(0), 123);
-				resolve(void 0);
+				resolve(undefined);
 			});
 			const buffer = Buffer.allocUnsafe(1);
 			buffer.writeInt8(123, 0);
@@ -81,7 +81,7 @@ suite('IPC, Socket Protocol', () => {
 		return new Promise(resolve => {
 			b.onMessage(msg => {
 				assert.deepEqual(JSON.parse(msg.toString()), data);
-				resolve(void 0);
+				resolve(undefined);
 			});
 		});
 	});
@@ -109,7 +109,7 @@ suite('IPC, Socket Protocol', () => {
 			const receiver2 = new Protocol(stream, buffer);
 			receiver2.onMessage((msg) => {
 				assert.equal(JSON.parse(msg.toString()).value, 2);
-				resolve(void 0);
+				resolve(undefined);
 			});
 		});
 

src/vs/base/parts/quickopen/browser/quickOpenModel.ts

@@ -46,7 +46,7 @@ export class QuickOpenItemAccessorClass implements IItemAccessor<QuickOpenEntry>
 	getItemPath(entry: QuickOpenEntry): string {
 		const resource = entry.getResource();
 
-		return resource ? resource.fsPath : void 0;
+		return resource ? resource.fsPath : undefined;
 	}
 }
 

src/vs/base/parts/quickopen/browser/quickOpenWidget.ts

@@ -277,7 +277,7 @@ export class QuickOpenWidget extends Disposable implements IModelProvider {
 
 		this._register(this.tree.onDidChangeSelection(event => {
 			if (event.selection && event.selection.length > 0) {
-				const mouseEvent: StandardMouseEvent = event.payload && event.payload.originalEvent instanceof StandardMouseEvent ? event.payload.originalEvent : void 0;
+				const mouseEvent: StandardMouseEvent = event.payload && event.payload.originalEvent instanceof StandardMouseEvent ? event.payload.originalEvent : undefined;
 				const shouldOpenInBackground = mouseEvent ? this.shouldOpenInBackground(mouseEvent) : false;
 
 				this.elementSelected(event.selection[0], event, shouldOpenInBackground ? Mode.OPEN_IN_BACKGROUND : Mode.OPEN);
@@ -574,7 +574,7 @@ export class QuickOpenWidget extends Disposable implements IModelProvider {
 	show(param: any, options?: IShowOptions): void {
 		this.visible = true;
 		this.isLoosingFocus = false;
-		this.quickNavigateConfiguration = options ? options.quickNavigateConfiguration : void 0;
+		this.quickNavigateConfiguration = options ? options.quickNavigateConfiguration : undefined;
 
 		// Adjust UI for quick navigate mode
 		if (this.quickNavigateConfiguration) {

src/vs/base/parts/quickopen/common/quickOpenScorer.ts

@@ -380,7 +380,7 @@ function doScoreItem(label: string, description: string, path: string, query: IP
 
 	// 1.) treat identity matches on full path highest
 	if (path && isLinux ? query.original === path : equalsIgnoreCase(query.original, path)) {
-		return { score: PATH_IDENTITY_SCORE, labelMatch: [{ start: 0, end: label.length }], descriptionMatch: description ? [{ start: 0, end: description.length }] : void 0 };
+		return { score: PATH_IDENTITY_SCORE, labelMatch: [{ start: 0, end: label.length }], descriptionMatch: description ? [{ start: 0, end: description.length }] : undefined };
 	}
 
 	// We only consider label matches if the query is not including file path separators

src/vs/base/parts/tree/browser/treeDefaults.ts

@@ -189,9 +189,9 @@ export class DefaultController implements _.IController {
 
 			if (this.shouldToggleExpansion(element, event, origin)) {
 				if (tree.isExpanded(element)) {
-					tree.collapse(element).then(void 0, errors.onUnexpectedError);
+					tree.collapse(element).then(undefined, errors.onUnexpectedError);
 				} else {
-					tree.expand(element).then(void 0, errors.onUnexpectedError);
+					tree.expand(element).then(undefined, errors.onUnexpectedError);
 				}
 			}
 		}
@@ -281,7 +281,7 @@ export class DefaultController implements _.IController {
 			tree.clearHighlight(payload);
 		} else {
 			tree.focusPrevious(1, payload);
-			tree.reveal(tree.getFocus()).then(void 0, errors.onUnexpectedError);
+			tree.reveal(tree.getFocus()).then(undefined, errors.onUnexpectedError);
 		}
 		return true;
 	}
@@ -293,7 +293,7 @@ export class DefaultController implements _.IController {
 			tree.clearHighlight(payload);
 		} else {
 			tree.focusPreviousPage(payload);
-			tree.reveal(tree.getFocus()).then(void 0, errors.onUnexpectedError);
+			tree.reveal(tree.getFocus()).then(undefined, errors.onUnexpectedError);
 		}
 		return true;
 	}
@@ -305,7 +305,7 @@ export class DefaultController implements _.IController {
 			tree.clearHighlight(payload);
 		} else {
 			tree.focusNext(1, payload);
-			tree.reveal(tree.getFocus()).then(void 0, errors.onUnexpectedError);
+			tree.reveal(tree.getFocus()).then(undefined, errors.onUnexpectedError);
 		}
 		return true;
 	}
@@ -317,7 +317,7 @@ export class DefaultController implements _.IController {
 			tree.clearHighlight(payload);
 		} else {
 			tree.focusNextPage(payload);
-			tree.reveal(tree.getFocus()).then(void 0, errors.onUnexpectedError);
+			tree.reveal(tree.getFocus()).then(undefined, errors.onUnexpectedError);
 		}
 		return true;
 	}
@@ -329,7 +329,7 @@ export class DefaultController implements _.IController {
 			tree.clearHighlight(payload);
 		} else {
 			tree.focusFirst(payload);
-			tree.reveal(tree.getFocus()).then(void 0, errors.onUnexpectedError);
+			tree.reveal(tree.getFocus()).then(undefined, errors.onUnexpectedError);
 		}
 		return true;
 	}
@@ -341,7 +341,7 @@ export class DefaultController implements _.IController {
 			tree.clearHighlight(payload);
 		} else {
 			tree.focusLast(payload);
-			tree.reveal(tree.getFocus()).then(void 0, errors.onUnexpectedError);
+			tree.reveal(tree.getFocus()).then(undefined, errors.onUnexpectedError);
 		}
 		return true;
 	}
@@ -359,7 +359,7 @@ export class DefaultController implements _.IController {
 					return tree.reveal(tree.getFocus());
 				}
 				return undefined;
-			}).then(void 0, errors.onUnexpectedError);
+			}).then(undefined, errors.onUnexpectedError);
 		}
 		return true;
 	}
@@ -377,7 +377,7 @@ export class DefaultController implements _.IController {
 					return tree.reveal(tree.getFocus());
 				}
 				return undefined;
-			}).then(void 0, errors.onUnexpectedError);
+			}).then(undefined, errors.onUnexpectedError);
 		}
 		return true;
 	}

src/vs/base/parts/tree/browser/treeModel.ts

@@ -525,7 +525,7 @@ export class Item {
 			});
 
 			return result
-				.then(void 0, onUnexpectedError)
+				.then(undefined, onUnexpectedError)
 				.then(() => this._onDidRefreshChildren.fire(eventData));
 		};
 

src/vs/base/test/browser/dom.test.ts

@@ -97,17 +97,17 @@ suite('dom', () => {
 			let div = $('div', { class: 'test' });
 			assert.equal(div.className, 'test');
 
-			div = $('div', void 0);
+			div = $('div', undefined);
 			assert.equal(div.className, '');
 		});
 
 		test('should build nodes with children', () => {
-			let div = $('div', void 0, $('span', { id: 'demospan' }));
+			let div = $('div', undefined, $('span', { id: 'demospan' }));
 			let firstChild = div.firstChild as HTMLElement;
 			assert.equal(firstChild.tagName, 'SPAN');
 			assert.equal(firstChild.id, 'demospan');
 
-			div = $('div', void 0, 'hello');
+			div = $('div', undefined, 'hello');
 
 			assert.equal(div.firstChild && div.firstChild.textContent, 'hello');
 		});

src/vs/base/test/browser/ui/splitview/splitview.test.ts

@@ -131,7 +131,7 @@ suite('Splitview', () => {
 		let didLayout = false;
 		const layoutDisposable = view.onDidLayout(() => didLayout = true);
 
-		const renderDisposable = view.onDidGetElement(() => void 0);
+		const renderDisposable = view.onDidGetElement(() => undefined);
 
 		splitview.addView(view, 20);
 

src/vs/base/test/common/arrays.test.ts

@@ -268,7 +268,7 @@ suite('Arrays', () => {
 		assert.equal(a[1], 2);
 		assert.equal(a[2], 3);
 
-		arrays.coalesce([null, 1, null, void 0, undefined, 2, 3]);
+		arrays.coalesce([null, 1, null, undefined, undefined, 2, 3]);
 		assert.equal(a.length, 3);
 		assert.equal(a[0], 1);
 		assert.equal(a[1], 2);

src/vs/base/test/common/async.test.ts

@@ -53,7 +53,7 @@ suite('Async', () => {
 		order.push('afterCreate');
 
 		const promise = cancellablePromise
-			.then(void 0, err => null)
+			.then(undefined, err => null)
 			.then(() => order.push('finally'));
 
 		cancellablePromise.cancel();
@@ -75,7 +75,7 @@ suite('Async', () => {
 		order.push('afterCreate');
 
 		const promise = cancellablePromise
-			.then(void 0, err => null)
+			.then(undefined, err => null)
 			.then(() => order.push('finally'));
 
 		cancellablePromise.cancel();
@@ -208,13 +208,13 @@ suite('Async', () => {
 
 		assert(!delayer.isTriggered());
 
-		promises.push(delayer.trigger(factory).then(void 0, () => { assert(true, 'yes, it was cancelled'); }));
+		promises.push(delayer.trigger(factory).then(undefined, () => { assert(true, 'yes, it was cancelled'); }));
 		assert(delayer.isTriggered());
 
-		promises.push(delayer.trigger(factory).then(void 0, () => { assert(true, 'yes, it was cancelled'); }));
+		promises.push(delayer.trigger(factory).then(undefined, () => { assert(true, 'yes, it was cancelled'); }));
 		assert(delayer.isTriggered());
 
-		promises.push(delayer.trigger(factory).then(void 0, () => { assert(true, 'yes, it was cancelled'); }));
+		promises.push(delayer.trigger(factory).then(undefined, () => { assert(true, 'yes, it was cancelled'); }));
 		assert(delayer.isTriggered());
 
 		delayer.cancel();
@@ -239,10 +239,10 @@ suite('Async', () => {
 			assert.equal(result, 1);
 			assert(!delayer.isTriggered());
 
-			promises.push(delayer.trigger(factory).then(void 0, () => { assert(true, 'yes, it was cancelled'); }));
+			promises.push(delayer.trigger(factory).then(undefined, () => { assert(true, 'yes, it was cancelled'); }));
 			assert(delayer.isTriggered());
 
-			promises.push(delayer.trigger(factory).then(void 0, () => { assert(true, 'yes, it was cancelled'); }));
+			promises.push(delayer.trigger(factory).then(undefined, () => { assert(true, 'yes, it was cancelled'); }));
 			assert(delayer.isTriggered());
 
 			delayer.cancel();
@@ -444,7 +444,7 @@ suite('Async', () => {
 
 		queue.queue(f1);
 		queue.queue(f2);
-		queue.queue(f3).then(void 0, () => error = true);
+		queue.queue(f3).then(undefined, () => error = true);
 		queue.queue(f4);
 		return queue.queue(f5).then(() => {
 			assert.equal(res[0], 1);

src/vs/base/test/common/cache.test.ts

@@ -42,7 +42,7 @@ suite('Cache', () => {
 		let result = cache.get();
 		assert.equal(counter1, 1);
 		assert.equal(counter2, 0);
-		result.promise.then(void 0, () => assert(true));
+		result.promise.then(undefined, () => assert(true));
 		result.dispose();
 		assert.equal(counter1, 1);
 		assert.equal(counter2, 0);

src/vs/base/test/common/event.test.ts

@@ -448,7 +448,7 @@ suite('Event utils', () => {
 						e(err);
 					}
 
-					c(void 0);
+					c(undefined);
 				});
 
 				setTimeout(() => emitter.fire(), 10);

src/vs/base/test/common/hash.test.ts

@@ -39,7 +39,7 @@ suite('Hash', () => {
 	test('object', () => {
 		assert.equal(hash({}), hash({}));
 		assert.equal(hash({ 'foo': 'bar' }), hash({ 'foo': 'bar' }));
-		assert.equal(hash({ 'foo': 'bar', 'foo2': void 0 }), hash({ 'foo2': void 0, 'foo': 'bar' }));
+		assert.equal(hash({ 'foo': 'bar', 'foo2': undefined }), hash({ 'foo2': undefined, 'foo': 'bar' }));
 		assert.notEqual(hash({ 'foo': 'bar' }), hash({ 'foo': 'bar2' }));
 		assert.notEqual(hash({}), hash([]));
 	});

src/vs/base/test/common/jsonEdit.test.ts

@@ -132,31 +132,31 @@ suite('JSON - edits', () => {
 
 	test('remove item in array with one item', () => {
 		let content = '[\n  1\n]';
-		let edits = setProperty(content, [0], void 0, formatterOptions);
+		let edits = setProperty(content, [0], undefined, formatterOptions);
 		assertEdit(content, edits, '[]');
 	});
 
 	test('remove item in the middle of the array', () => {
 		let content = '[\n  1,\n  2,\n  3\n]';
-		let edits = setProperty(content, [1], void 0, formatterOptions);
+		let edits = setProperty(content, [1], undefined, formatterOptions);
 		assertEdit(content, edits, '[\n  1,\n  3\n]');
 	});
 
 	test('remove last item in the array', () => {
 		let content = '[\n  1,\n  2,\n  "bar"\n]';
-		let edits = setProperty(content, [2], void 0, formatterOptions);
+		let edits = setProperty(content, [2], undefined, formatterOptions);
 		assertEdit(content, edits, '[\n  1,\n  2\n]');
 	});
 
 	test('remove last item in the array if ends with comma', () => {
 		let content = '[\n  1,\n  "foo",\n  "bar",\n]';
-		let edits = setProperty(content, [2], void 0, formatterOptions);
+		let edits = setProperty(content, [2], undefined, formatterOptions);
 		assertEdit(content, edits, '[\n  1,\n  "foo"\n]');
 	});
 
 	test('remove last item in the array if there is a comment in the beginning', () => {
 		let content = '// This is a comment\n[\n  1,\n  "foo",\n  "bar"\n]';
-		let edits = setProperty(content, [2], void 0, formatterOptions);
+		let edits = setProperty(content, [2], undefined, formatterOptions);
 		assertEdit(content, edits, '// This is a comment\n[\n  1,\n  "foo"\n]');
 	});
 

src/vs/base/test/common/jsonFormatter.test.ts

@@ -8,7 +8,7 @@ import * as assert from 'assert';
 suite('JSON - formatter', () => {
 
 	function format(content: string, expected: string, insertSpaces = true) {
-		let range: Formatter.Range | undefined = void 0;
+		let range: Formatter.Range | undefined = undefined;
 		var rangeStart = content.indexOf('|');
 		var rangeEnd = content.lastIndexOf('|');
 		if (rangeStart !== -1 && rangeEnd !== -1) {

src/vs/base/test/common/objects.test.ts

@@ -193,13 +193,13 @@ suite('Objects', () => {
 			three: {
 				3: true
 			},
-			four: void 0
+			four: undefined
 		};
 
 		diff = objects.distinct(base, obj);
 		assert.deepEqual(diff, {
 			one: null,
-			four: void 0
+			four: undefined
 		});
 
 		obj = {

src/vs/base/test/common/resources.test.ts

@@ -221,10 +221,10 @@ suite('Resources', () => {
 		}
 		assertMalformedFileUri('/foo/bar', 'file:///foo/bar');
 
-		assertMalformedFileUri('file:///foo/bar', void 0);
-		assertMalformedFileUri('file:///c%3A/foo/bar', void 0);
-		assertMalformedFileUri('file://localhost/c$/devel/test', void 0);
-		assertMalformedFileUri('foo://dadie/foo/bar', void 0);
-		assertMalformedFileUri('foo:///dadie/foo/bar', void 0);
+		assertMalformedFileUri('file:///foo/bar', undefined);
+		assertMalformedFileUri('file:///c%3A/foo/bar', undefined);
+		assertMalformedFileUri('file://localhost/c$/devel/test', undefined);
+		assertMalformedFileUri('foo://dadie/foo/bar', undefined);
+		assertMalformedFileUri('foo:///dadie/foo/bar', undefined);
 	});
 });

src/vs/base/test/common/strings.test.ts

@@ -320,7 +320,7 @@ suite('Strings', () => {
 	});
 
 	test('fuzzyContains', () => {
-		assert.ok(!strings.fuzzyContains((void 0)!, null!));
+		assert.ok(!strings.fuzzyContains((undefined)!, null!));
 		assert.ok(strings.fuzzyContains('hello world', 'h'));
 		assert.ok(!strings.fuzzyContains('hello world', 'q'));
 		assert.ok(strings.fuzzyContains('hello world', 'hw'));

src/vs/base/test/node/extfs/fixtures/examples/company.jxs

@@ -8,8 +8,8 @@ var Workforce;
         return Company;
     })();
     (function (property, Workforce, IEmployee) {
-        if (property === void 0) { property = employees; }
-        if (IEmployee === void 0) { IEmployee = []; }
+        if (property === undefined) { property = employees; }
+        if (IEmployee === undefined) { IEmployee = []; }
         property;
         calculateMonthlyExpenses();
         {

src/vs/base/test/node/extfs/fixtures/examples/conway.jxs

@@ -7,9 +7,9 @@ var Conway;
         return Cell;
     })();
     (function (property, number, property, number, property, boolean) {
-        if (property === void 0) { property = row; }
-        if (property === void 0) { property = col; }
-        if (property === void 0) { property = live; }
+        if (property === undefined) { property = row; }
+        if (property === undefined) { property = col; }
+        if (property === undefined) { property = live; }
     });
     var GameOfLife = (function () {
         function GameOfLife() {

src/vs/base/test/node/extfs/fixtures/examples/small.jxs

@@ -7,10 +7,10 @@ var M;
         return C;
     })();
     (function (x, property, number) {
-        if (property === void 0) { property = w; }
+        if (property === undefined) { property = w; }
         var local = 1;
         // unresolved symbol because x is local
-        //self.x++; 
+        //self.x++;
         self.w--; // ok because w is a property
         property;
         f = function (y) {

src/vs/base/test/node/pfs.test.ts

@@ -73,11 +73,11 @@ suite('PFS', () => {
 			assert.ok(fs.existsSync(newDir));
 
 			return Promise.all([
-				pfs.writeFile(testFile, 'Hello World 1', void 0),
-				pfs.writeFile(testFile, 'Hello World 2', void 0),
-				timeout(10).then(() => pfs.writeFile(testFile, 'Hello World 3', void 0)),
-				pfs.writeFile(testFile, 'Hello World 4', void 0),
-				timeout(10).then(() => pfs.writeFile(testFile, 'Hello World 5', void 0))
+				pfs.writeFile(testFile, 'Hello World 1', undefined),
+				pfs.writeFile(testFile, 'Hello World 2', undefined),
+				timeout(10).then(() => pfs.writeFile(testFile, 'Hello World 3', undefined)),
+				pfs.writeFile(testFile, 'Hello World 4', undefined),
+				timeout(10).then(() => pfs.writeFile(testFile, 'Hello World 5', undefined))
 			]).then(() => {
 				assert.equal(fs.readFileSync(testFile), 'Hello World 5');
 

src/vs/base/test/node/port.test.ts

@@ -21,7 +21,7 @@ suite('Ports', () => {
 
 			// create a server to block this port
 			const server = net.createServer();
-			server.listen(initialPort, void 0, void 0, () => {
+			server.listen(initialPort, undefined, undefined, () => {
 
 				// once listening, find another free port and assert that the port is different from the opened one
 				ports.findFreePort(7000, 50, 300000).then(freePort => {

src/vs/base/test/node/storage/storage.test.ts

@@ -135,14 +135,14 @@ suite('Storage Library', () => {
 		changes.clear();
 
 		// Delete is accepted
-		change.set('foo', void 0);
+		change.set('foo', undefined);
 		database.fireDidChangeItemsExternal({ items: change });
 		ok(changes.has('foo'));
 		equal(storage.get('foo', null!), null);
 		changes.clear();
 
 		// Nothing happens if changing to same value
-		change.set('foo', void 0);
+		change.set('foo', undefined);
 		database.fireDidChangeItemsExternal({ items: change });
 		equal(changes.size, 0);
 

src/vs/code/electron-browser/sharedProcess/contrib/languagePackCachedDataCleaner.ts

@@ -103,7 +103,7 @@ export class LanguagePackCachedDataCleaner {
 
 		this._disposables.push({
 			dispose() {
-				if (handle !== void 0) {
+				if (handle !== undefined) {
 					clearTimeout(handle);
 				}
 			}

src/vs/code/electron-browser/sharedProcess/contrib/logsDataCleaner.ts

@@ -21,7 +21,7 @@ export class LogsDataCleaner extends Disposable {
 
 	private cleanUpOldLogsSoon(): void {
 		let handle: any = setTimeout(() => {
-			handle = void 0;
+			handle = undefined;
 
 			const currentLog = basename(this.environmentService.logsPath);
 			const logsRoot = dirname(this.environmentService.logsPath);

src/vs/code/electron-browser/sharedProcess/contrib/storageDataCleaner.ts

@@ -25,7 +25,7 @@ export class StorageDataCleaner extends Disposable {
 
 	private cleanUpStorageSoon(): void {
 		let handle: any = setTimeout(() => {
-			handle = void 0;
+			handle = undefined;
 
 			// Leverage the backup workspace file to find out which empty workspace is currently in use to
 			// determine which empty workspace storage can safely be deleted

src/vs/code/electron-main/app.ts

@@ -474,7 +474,7 @@ export class CodeApplication extends Disposable {
 		this.lifecycleService.onWillShutdown(e => e.join(storageMainService.close()));
 
 		// Initialize storage service
-		return storageMainService.initialize().then(void 0, error => {
+		return storageMainService.initialize().then(undefined, error => {
 			errors.onUnexpectedError(error);
 			this.logService.error(error);
 		}).then(() => {

src/vs/code/electron-main/main.ts

@@ -346,7 +346,7 @@ function main(): void {
 		console.error(err.message);
 		app.exit(1);
 
-		return void 0;
+		return undefined;
 	}
 
 	// If we are started with --wait create a random temporary file

src/vs/code/electron-main/sharedProcess.ts

@@ -105,7 +105,7 @@ export class SharedProcess implements ISharedProcess {
 				});
 
 				disposables.push(toDisposable(() => sender.send('handshake:goodbye')));
-				ipcMain.once('handshake:im ready', () => c(void 0));
+				ipcMain.once('handshake:im ready', () => c(undefined));
 			});
 		});
 	}

src/vs/code/electron-main/window.ts

@@ -253,19 +253,19 @@ export class CodeWindow extends Disposable implements ICodeWindow {
 	}
 
 	get backupPath(): string {
-		return this.currentConfig ? this.currentConfig.backupPath : void 0;
+		return this.currentConfig ? this.currentConfig.backupPath : undefined;
 	}
 
 	get openedWorkspace(): IWorkspaceIdentifier {
-		return this.currentConfig ? this.currentConfig.workspace : void 0;
+		return this.currentConfig ? this.currentConfig.workspace : undefined;
 	}
 
 	get openedFolderUri(): URI {
-		return this.currentConfig ? this.currentConfig.folderUri : void 0;
+		return this.currentConfig ? this.currentConfig.folderUri : undefined;
 	}
 
 	get remoteAuthority(): string {
-		return this.currentConfig ? this.currentConfig.remoteAuthority : void 0;
+		return this.currentConfig ? this.currentConfig.remoteAuthority : undefined;
 	}
 
 	setReady(): void {
@@ -444,7 +444,7 @@ export class CodeWindow extends Disposable implements ICodeWindow {
 		// Make sure to update our workspace config if we detect that it
 		// was deleted
 		if (this.openedWorkspace && this.openedWorkspace.id === workspace.id) {
-			this.currentConfig.workspace = void 0;
+			this.currentConfig.workspace = undefined;
 		}
 	}
 
@@ -602,13 +602,13 @@ export class CodeWindow extends Disposable implements ICodeWindow {
 		windowConfiguration.perfEntries = perf.exportEntries();
 
 		// Parts splash
-		windowConfiguration.partsSplashData = this.storageMainService.get('parts-splash-data', void 0);
+		windowConfiguration.partsSplashData = this.storageMainService.get('parts-splash-data', undefined);
 
 		// Config (combination of process.argv and window configuration)
 		const environment = parseArgs(process.argv);
 		const config = objects.assign(environment, windowConfiguration);
 		for (let key in config) {
-			if (config[key] === void 0 || config[key] === null || config[key] === '' || config[key] === false) {
+			if (config[key] === undefined || config[key] === null || config[key] === '' || config[key] === false) {
 				delete config[key]; // only send over properties that have a true value
 			}
 		}
@@ -648,7 +648,7 @@ export class CodeWindow extends Disposable implements ICodeWindow {
 
 			const res = {
 				mode: WindowMode.Fullscreen,
-				display: display ? display.id : void 0,
+				display: display ? display.id : undefined,
 
 				// Still carry over window dimensions from previous sessions
 				// if we can compute it in fullscreen state.
@@ -1033,13 +1033,13 @@ export class CodeWindow extends Disposable implements ICodeWindow {
 			if (item.iconLocation && item.iconLocation.dark.scheme === 'file') {
 				icon = nativeImage.createFromPath(URI.revive(item.iconLocation.dark).fsPath);
 				if (icon.isEmpty()) {
-					icon = void 0;
+					icon = undefined;
 				}
 			}
 
 			return {
 				id: item.id,
-				label: !icon ? item.title as string : void 0,
+				label: !icon ? item.title as string : undefined,
 				icon
 			};
 		});

src/vs/code/electron-main/windows.ts

@@ -248,7 +248,7 @@ export class WindowsManager implements IWindowsMainService {
 				// clear last closed window state when a new window opens. this helps on macOS where
 				// otherwise closing the last window, opening a new window and then quitting would
 				// use the state of the previously closed window when restarting.
-				this.lastClosedWindowState = void 0;
+				this.lastClosedWindowState = undefined;
 			}
 		});
 	}
@@ -386,7 +386,7 @@ export class WindowsManager implements IWindowsMainService {
 		}
 
 		// collect all file inputs
-		let fileInputs: IFileInputs = void 0;
+		let fileInputs: IFileInputs = undefined;
 		for (const path of pathsToOpen) {
 			if (path.fileUri) {
 				if (!fileInputs) {
@@ -512,7 +512,7 @@ export class WindowsManager implements IWindowsMainService {
 		// used for the edit operation is closed or loaded to a different folder so that the waiting
 		// process can continue. We do this by deleting the waitMarkerFilePath.
 		if (openConfig.context === OpenContext.CLI && openConfig.cli.wait && openConfig.cli.waitMarkerFilePath && usedWindows.length === 1 && usedWindows[0]) {
-			this.waitForWindowCloseOrLoad(usedWindows[0].id).then(() => fs.unlink(openConfig.cli.waitMarkerFilePath, error => void 0));
+			this.waitForWindowCloseOrLoad(usedWindows[0].id).then(() => fs.unlink(openConfig.cli.waitMarkerFilePath, error => undefined));
 		}
 
 		return usedWindows;
@@ -594,7 +594,7 @@ export class WindowsManager implements IWindowsMainService {
 					usedWindows.push(this.doOpenFilesInExistingWindow(openConfig, bestWindowOrFolder, fileInputs));
 
 					// Reset these because we handled them
-					fileInputs = void 0;
+					fileInputs = undefined;
 				}
 			}
 
@@ -611,7 +611,7 @@ export class WindowsManager implements IWindowsMainService {
 				}));
 
 				// Reset these because we handled them
-				fileInputs = void 0;
+				fileInputs = undefined;
 			}
 		}
 
@@ -623,14 +623,14 @@ export class WindowsManager implements IWindowsMainService {
 			const windowsOnWorkspace = arrays.coalesce(allWorkspacesToOpen.map(workspaceToOpen => findWindowOnWorkspace(WindowsManager.WINDOWS, workspaceToOpen)));
 			if (windowsOnWorkspace.length > 0) {
 				const windowOnWorkspace = windowsOnWorkspace[0];
-				const fileInputsForWindow = (fileInputs && fileInputs.remoteAuthority === windowOnWorkspace.remoteAuthority) ? fileInputs : void 0;
+				const fileInputsForWindow = (fileInputs && fileInputs.remoteAuthority === windowOnWorkspace.remoteAuthority) ? fileInputs : undefined;
 
 				// Do open files
 				usedWindows.push(this.doOpenFilesInExistingWindow(openConfig, windowOnWorkspace, fileInputsForWindow));
 
 				// Reset these because we handled them
 				if (fileInputsForWindow) {
-					fileInputs = void 0;
+					fileInputs = undefined;
 				}
 
 				openFolderInNewWindow = true; // any other folders to open must open in new window then
@@ -642,14 +642,14 @@ export class WindowsManager implements IWindowsMainService {
 					return; // ignore folders that are already open
 				}
 
-				const fileInputsForWindow = (fileInputs && !fileInputs.remoteAuthority) ? fileInputs : void 0;
+				const fileInputsForWindow = (fileInputs && !fileInputs.remoteAuthority) ? fileInputs : undefined;
 
 				// Do open folder
 				usedWindows.push(this.doOpenFolderOrWorkspace(openConfig, { workspace: workspaceToOpen }, openFolderInNewWindow, fileInputsForWindow));
 
 				// Reset these because we handled them
 				if (fileInputsForWindow) {
-					fileInputs = void 0;
+					fileInputs = undefined;
 				}
 
 				openFolderInNewWindow = true; // any other folders to open must open in new window then
@@ -665,14 +665,14 @@ export class WindowsManager implements IWindowsMainService {
 			const windowsOnFolderPath = arrays.coalesce(allFoldersToOpen.map(folderToOpen => findWindowOnWorkspace(WindowsManager.WINDOWS, folderToOpen)));
 			if (windowsOnFolderPath.length > 0) {
 				const windowOnFolderPath = windowsOnFolderPath[0];
-				const fileInputsForWindow = fileInputs && fileInputs.remoteAuthority === windowOnFolderPath.remoteAuthority ? fileInputs : void 0;
+				const fileInputsForWindow = fileInputs && fileInputs.remoteAuthority === windowOnFolderPath.remoteAuthority ? fileInputs : undefined;
 
 				// Do open files
 				usedWindows.push(this.doOpenFilesInExistingWindow(openConfig, windowOnFolderPath, fileInputsForWindow));
 
 				// Reset these because we handled them
 				if (fileInputsForWindow) {
-					fileInputs = void 0;
+					fileInputs = undefined;
 				}
 
 				openFolderInNewWindow = true; // any other folders to open must open in new window then
@@ -686,14 +686,14 @@ export class WindowsManager implements IWindowsMainService {
 				}
 
 				const remoteAuthority = getRemoteAuthority(folderToOpen);
-				const fileInputsForWindow = (fileInputs && fileInputs.remoteAuthority === remoteAuthority) ? fileInputs : void 0;
+				const fileInputsForWindow = (fileInputs && fileInputs.remoteAuthority === remoteAuthority) ? fileInputs : undefined;
 
 				// Do open folder
 				usedWindows.push(this.doOpenFolderOrWorkspace(openConfig, { folderUri: folderToOpen, remoteAuthority }, openFolderInNewWindow, fileInputsForWindow));
 
 				// Reset these because we handled them
 				if (fileInputsForWindow) {
-					fileInputs = void 0;
+					fileInputs = undefined;
 				}
 
 				openFolderInNewWindow = true; // any other folders to open must open in new window then
@@ -704,7 +704,7 @@ export class WindowsManager implements IWindowsMainService {
 		if (emptyToRestore.length > 0) {
 			emptyToRestore.forEach(emptyWindowBackupInfo => {
 				const remoteAuthority = emptyWindowBackupInfo.remoteAuthority;
-				const fileInputsForWindow = (fileInputs && fileInputs.remoteAuthority === remoteAuthority) ? fileInputs : void 0;
+				const fileInputsForWindow = (fileInputs && fileInputs.remoteAuthority === remoteAuthority) ? fileInputs : undefined;
 
 				usedWindows.push(this.openInBrowserWindow({
 					userEnv: openConfig.userEnv,
@@ -719,7 +719,7 @@ export class WindowsManager implements IWindowsMainService {
 
 				// Reset these because we handled them
 				if (fileInputsForWindow) {
-					fileInputs = void 0;
+					fileInputs = undefined;
 				}
 
 				openFolderInNewWindow = true; // any other folders to open must open in new window then
@@ -731,7 +731,7 @@ export class WindowsManager implements IWindowsMainService {
 			if (fileInputs && !emptyToOpen) {
 				emptyToOpen++;
 			}
-			const remoteAuthority = fileInputs ? fileInputs.remoteAuthority : (openConfig.cli && openConfig.cli.remote || void 0);
+			const remoteAuthority = fileInputs ? fileInputs.remoteAuthority : (openConfig.cli && openConfig.cli.remote || undefined);
 			for (let i = 0; i < emptyToOpen; i++) {
 				usedWindows.push(this.openInBrowserWindow({
 					userEnv: openConfig.userEnv,
@@ -744,7 +744,7 @@ export class WindowsManager implements IWindowsMainService {
 				}));
 
 				// Reset these because we handled them
-				fileInputs = void 0;
+				fileInputs = undefined;
 				openFolderInNewWindow = true; // any other window to open must open in new window then
 			}
 		}
@@ -885,7 +885,7 @@ export class WindowsManager implements IWindowsMainService {
 
 	private doExtractPathsFromCLI(cli: ParsedArgs): IPath[] {
 		const pathsToOpen: IPathToOpen[] = [];
-		const parseOptions: IPathParseOptions = { ignoreFileNotFound: true, gotoLineMode: cli.goto, remoteAuthority: cli.remote || void 0 };
+		const parseOptions: IPathParseOptions = { ignoreFileNotFound: true, gotoLineMode: cli.goto, remoteAuthority: cli.remote || undefined };
 
 		// folder uris
 		const folderUris = asArray(cli['folder-uri']);
@@ -1073,8 +1073,8 @@ export class WindowsManager implements IWindowsMainService {
 					// File
 					return {
 						fileUri: URI.file(candidate),
-						lineNumber: gotoLineMode ? parsedPath.line : void 0,
-						columnNumber: gotoLineMode ? parsedPath.column : void 0,
+						lineNumber: gotoLineMode ? parsedPath.line : undefined,
+						columnNumber: gotoLineMode ? parsedPath.column : undefined,
 						remoteAuthority
 					};
 				}
@@ -1472,7 +1472,7 @@ export class WindowsManager implements IWindowsMainService {
 		// Only reload when the window has not vetoed this
 		this.lifecycleService.unload(win, UnloadReason.RELOAD).then(veto => {
 			if (!veto) {
-				win.reload(void 0, cli);
+				win.reload(undefined, cli);
 
 				// Emit
 				this._onWindowReload.fire(win.id);
@@ -1574,7 +1574,7 @@ export class WindowsManager implements IWindowsMainService {
 
 	openNewWindow(context: OpenContext, options?: INewWindowOptions): ICodeWindow[] {
 		let cli = this.environmentService.args;
-		let remote = options && options.remoteAuthority || void 0;
+		let remote = options && options.remoteAuthority || undefined;
 		if (cli && (cli.remote !== remote)) {
 			cli = { ...cli, remote };
 		}
@@ -1866,7 +1866,7 @@ class Dialogs {
 
 		// Ensure properties
 		if (typeof options.pickFiles === 'boolean' || typeof options.pickFolders === 'boolean') {
-			options.dialogOptions.properties = void 0; // let it override based on the booleans
+			options.dialogOptions.properties = undefined; // let it override based on the booleans
 
 			if (options.pickFiles && options.pickFolders) {
 				options.dialogOptions.properties = ['multiSelections', 'openDirectory', 'openFile', 'createDirectory'];
@@ -1893,7 +1893,7 @@ class Dialogs {
 				return paths.map(path => URI.file(path));
 			}
 
-			return void 0;
+			return undefined;
 		});
 	}
 
@@ -1914,7 +1914,7 @@ class Dialogs {
 	showMessageBox(options: Electron.MessageBoxOptions, window?: ICodeWindow): Promise<IMessageBoxResult> {
 		return this.getDialogQueue(window).queue(() => {
 			return new Promise(resolve => {
-				dialog.showMessageBox(window ? window.win : void 0, options, (response: number, checkboxChecked: boolean) => {
+				dialog.showMessageBox(window ? window.win : undefined, options, (response: number, checkboxChecked: boolean) => {
 					resolve({ button: response, checkboxChecked });
 				});
 			});
@@ -1933,7 +1933,7 @@ class Dialogs {
 
 		return this.getDialogQueue(window).queue(() => {
 			return new Promise(resolve => {
-				dialog.showSaveDialog(window ? window.win : void 0, options, path => {
+				dialog.showSaveDialog(window ? window.win : undefined, options, path => {
 					resolve(normalizePath(path));
 				});
 			});
@@ -1958,14 +1958,14 @@ class Dialogs {
 				if (options.defaultPath) {
 					validatePathPromise = exists(options.defaultPath).then(exists => {
 						if (!exists) {
-							options.defaultPath = void 0;
+							options.defaultPath = undefined;
 						}
 					});
 				}
 
 				// Show dialog and wrap as promise
 				validatePathPromise.then(() => {
-					dialog.showOpenDialog(window ? window.win : void 0, options, paths => {
+					dialog.showOpenDialog(window ? window.win : undefined, options, paths => {
 						resolve(normalizePaths(paths));
 					});
 				});
@@ -2073,7 +2073,7 @@ class WorkspacesManager {
 		}
 
 		// Update window configuration properly based on transition to workspace
-		window.config.folderUri = void 0;
+		window.config.folderUri = undefined;
 		window.config.workspace = workspace;
 		window.config.backupPath = backupPath;
 
@@ -2084,7 +2084,7 @@ class WorkspacesManager {
 		const window = this.windowsMainService.getWindowById(options.windowId) || this.windowsMainService.getFocusedWindow() || this.windowsMainService.getLastActiveWindow();
 
 		this.windowsMainService.pickFileAndOpen({
-			windowId: window ? window.id : void 0,
+			windowId: window ? window.id : undefined,
 			dialogOptions: {
 				buttonLabel: mnemonicButtonLabel(localize({ key: 'openWorkspace', comment: ['&& denotes a mnemonic'] }, "&&Open")),
 				title: localize('openWorkspaceTitle', "Open Workspace"),
@@ -2166,7 +2166,7 @@ class WorkspacesManager {
 	private getUntitledWorkspaceSaveDialogDefaultPath(workspace?: IWorkspaceIdentifier | ISingleFolderWorkspaceIdentifier): string {
 		if (workspace) {
 			if (isSingleFolderWorkspaceIdentifier(workspace)) {
-				return workspace.scheme === Schemas.file ? dirname(workspace.fsPath) : void 0;
+				return workspace.scheme === Schemas.file ? dirname(workspace.fsPath) : undefined;
 			}
 
 			const resolvedWorkspace = this.workspacesMainService.resolveWorkspaceSync(workspace.configPath);
@@ -2179,6 +2179,6 @@ class WorkspacesManager {
 			}
 		}
 
-		return void 0;
+		return undefined;
 	}
 }

src/vs/code/node/cli.ts

@@ -206,14 +206,14 @@ export async function main(argv: string[]): Promise<any> {
 							console.log(`Run with '${product.applicationName} -' to read from stdin (e.g. 'ps aux | grep code | ${product.applicationName} -').`);
 						}
 
-						c(void 0);
+						c(undefined);
 					};
 
 					// wait for 1s maximum...
 					setTimeout(() => {
 						process.stdin.removeListener('data', dataListener);
 
-						c(void 0);
+						c(undefined);
 					}, 1000);
 
 					// ...but finish early if we detect data
@@ -360,7 +360,7 @@ export async function main(argv: string[]): Promise<any> {
 			return new Promise<void>(c => {
 
 				// Complete when process exits
-				child.once('exit', () => c(void 0));
+				child.once('exit', () => c(undefined));
 
 				// Complete when wait marker file is deleted
 				whenDeleted(waitMarkerFilePath!).then(c, c);

src/vs/code/node/cliProcessMain.ts

@@ -58,7 +58,7 @@ export function getIdAndVersion(id: string): [string, string | undefined] {
 	if (matches && matches[1]) {
 		return [adoptToGalleryExtensionId(matches[1]), matches[2]];
 	}
-	return [adoptToGalleryExtensionId(id), void 0];
+	return [adoptToGalleryExtensionId(id), undefined];
 }
 
 

src/vs/code/node/paths.ts

@@ -119,8 +119,8 @@ export function parseLineAndColumnAware(rawPath: string): IPathWithLineAndColumn
 
 	return {
 		path: path,
-		line: line !== null ? line : void 0,
-		column: column !== null ? column : line !== null ? 1 : void 0 // if we have a line, make sure column is also set
+		line: line !== null ? line : undefined,
+		column: column !== null ? column : line !== null ? 1 : undefined // if we have a line, make sure column is also set
 	};
 }
 

src/vs/editor/browser/controller/mouseTarget.ts

@@ -645,7 +645,7 @@ export class MouseTargetFactory {
 			// This most likely indicates it happened after the last view-line
 			const lineCount = ctx.model.getLineCount();
 			const maxLineColumn = ctx.model.getLineMaxColumn(lineCount);
-			return request.fulfill(MouseTargetType.CONTENT_EMPTY, new Position(lineCount, maxLineColumn), void 0, EMPTY_CONTENT_AFTER_LINES);
+			return request.fulfill(MouseTargetType.CONTENT_EMPTY, new Position(lineCount, maxLineColumn), undefined, EMPTY_CONTENT_AFTER_LINES);
 		}
 
 		if (domHitTestExecuted) {
@@ -656,7 +656,7 @@ export class MouseTargetFactory {
 				if (ctx.model.getLineLength(lineNumber) === 0) {
 					const lineWidth = ctx.getLineWidth(lineNumber);
 					const detail = createEmptyContentDataInLines(request.mouseContentHorizontalOffset - lineWidth);
-					return request.fulfill(MouseTargetType.CONTENT_EMPTY, new Position(lineNumber, 1), void 0, detail);
+					return request.fulfill(MouseTargetType.CONTENT_EMPTY, new Position(lineNumber, 1), undefined, detail);
 				}
 			}
 
@@ -731,10 +731,10 @@ export class MouseTargetFactory {
 			if (browser.isEdge && pos.column === 1) {
 				// See https://github.com/Microsoft/vscode/issues/10875
 				const detail = createEmptyContentDataInLines(request.mouseContentHorizontalOffset - lineWidth);
-				return request.fulfill(MouseTargetType.CONTENT_EMPTY, new Position(lineNumber, ctx.model.getLineMaxColumn(lineNumber)), void 0, detail);
+				return request.fulfill(MouseTargetType.CONTENT_EMPTY, new Position(lineNumber, ctx.model.getLineMaxColumn(lineNumber)), undefined, detail);
 			}
 			const detail = createEmptyContentDataInLines(request.mouseContentHorizontalOffset - lineWidth);
-			return request.fulfill(MouseTargetType.CONTENT_EMPTY, pos, void 0, detail);
+			return request.fulfill(MouseTargetType.CONTENT_EMPTY, pos, undefined, detail);
 		}
 
 		const visibleRange = ctx.visibleRangeForPosition2(lineNumber, column);

src/vs/editor/browser/services/codeEditorServiceImpl.ts

@@ -147,7 +147,7 @@ class DecorationTypeOptionsProvider implements IModelDecorationOptionsProvider {
 			if (rules.hasContent) {
 				return rules.className;
 			}
-			return void 0;
+			return undefined;
 		};
 		const createInlineCSSRules = (type: ModelDecorationCSSRuleType) => {
 			const rules = new DecorationCSSRules(type, providerArgs, themeService);

src/vs/editor/browser/view/viewOutgoingEvents.ts

@@ -47,13 +47,13 @@ export class ViewOutgoingEvents extends Disposable {
 
 	public emitViewFocusGained(): void {
 		if (this.onDidGainFocus) {
-			this.onDidGainFocus(void 0);
+			this.onDidGainFocus(undefined);
 		}
 	}
 
 	public emitViewFocusLost(): void {
 		if (this.onDidLoseFocus) {
-			this.onDidLoseFocus(void 0);
+			this.onDidLoseFocus(undefined);
 		}
 	}
 

src/vs/editor/browser/widget/codeEditorWidget.ts

@@ -930,7 +930,7 @@ export class CodeEditorWidget extends Disposable implements editorBrowser.ICodeE
 
 		const action = this.getAction(handlerId);
 		if (action) {
-			Promise.resolve(action.run()).then(void 0, onUnexpectedError);
+			Promise.resolve(action.run()).then(undefined, onUnexpectedError);
 			return;
 		}
 
@@ -951,7 +951,7 @@ export class CodeEditorWidget extends Disposable implements editorBrowser.ICodeE
 			payload = payload || {};
 			payload.source = source;
 			this._instantiationService.invokeFunction((accessor) => {
-				Promise.resolve(command.runEditorCommand(accessor, this, payload)).then(void 0, onUnexpectedError);
+				Promise.resolve(command.runEditorCommand(accessor, this, payload)).then(undefined, onUnexpectedError);
 			});
 			return true;
 		}
@@ -1328,7 +1328,7 @@ export class CodeEditorWidget extends Disposable implements editorBrowser.ICodeE
 		}));
 
 		listenersToRemove.push(cursor.onDidAttemptReadOnlyEdit(() => {
-			this._onDidAttemptReadOnlyEdit.fire(void 0);
+			this._onDidAttemptReadOnlyEdit.fire(undefined);
 		}));
 
 		listenersToRemove.push(cursor.onDidChange((e: CursorStateChangedEvent) => {
@@ -1767,11 +1767,11 @@ class CodeEditorWidgetFocusTracker extends Disposable {
 
 		this._register(this._domFocusTracker.onDidFocus(() => {
 			this._hasFocus = true;
-			this._onChange.fire(void 0);
+			this._onChange.fire(undefined);
 		}));
 		this._register(this._domFocusTracker.onDidBlur(() => {
 			this._hasFocus = false;
-			this._onChange.fire(void 0);
+			this._onChange.fire(undefined);
 		}));
 	}
 

src/vs/editor/common/controller/cursor.ts

@@ -194,7 +194,7 @@ export class Cursor extends viewEvents.ViewEventEmitter implements ICursors {
 	public setStates(source: string, reason: CursorChangeReason, states: PartialCursorState[] | null): void {
 		if (states !== null && states.length > Cursor.MAX_CURSOR_COUNT) {
 			states = states.slice(0, Cursor.MAX_CURSOR_COUNT);
-			this._onDidReachMaxCursorCount.fire(void 0);
+			this._onDidReachMaxCursorCount.fire(undefined);
 		}
 
 		const oldState = new CursorModelState(this._model, this);
@@ -467,7 +467,7 @@ export class Cursor extends viewEvents.ViewEventEmitter implements ICursors {
 		if (this._configuration.editor.readOnly) {
 			// All the remaining handlers will try to edit the model,
 			// but we cannot edit when read only...
-			this._onDidAttemptReadOnlyEdit.fire(void 0);
+			this._onDidAttemptReadOnlyEdit.fire(undefined);
 			return;
 		}
 

src/vs/editor/common/editorAction.ts

@@ -38,10 +38,10 @@ export class InternalEditorAction implements IEditorAction {
 
 	public run(): Promise<void> {
 		if (!this.isSupported()) {
-			return Promise.resolve(void 0);
+			return Promise.resolve(undefined);
 		}
 
 		const r = this._run();
-		return r ? r : Promise.resolve(void 0);
+		return r ? r : Promise.resolve(undefined);
 	}
 }

src/vs/editor/common/modes/modesRegistry.ts

@@ -32,11 +32,11 @@ export class EditorModesRegistry {
 
 	public registerLanguage(def: ILanguageExtensionPoint): void {
 		this._languages.push(def);
-		this._onDidChangeLanguages.fire(void 0);
+		this._onDidChangeLanguages.fire(undefined);
 	}
 	public setDynamicLanguages(def: ILanguageExtensionPoint[]): void {
 		this._dynamicLanguages = def;
-		this._onDidChangeLanguages.fire(void 0);
+		this._onDidChangeLanguages.fire(undefined);
 	}
 	public getLanguages(): ILanguageExtensionPoint[] {
 		return (<ILanguageExtensionPoint[]>[]).concat(this._languages).concat(this._dynamicLanguages);

src/vs/editor/common/services/editorWorkerServiceImpl.ts

@@ -361,7 +361,7 @@ export class EditorWorkerClient extends Disposable {
 	}
 
 	protected _getProxy(): Promise<EditorSimpleWorkerImpl> {
-		return this._getOrCreateWorker().getProxyObject().then(void 0, (err) => {
+		return this._getOrCreateWorker().getProxyObject().then(undefined, (err) => {
 			logOnceWebWorkerWarning(err);
 			this._worker = new SynchronousWorkerClient(new EditorSimpleWorkerImpl(null));
 			return this._getOrCreateWorker().getProxyObject();

src/vs/editor/common/services/resourceConfigurationImpl.ts

@@ -38,7 +38,7 @@ export class TextResourceConfigurationService extends Disposable implements ITex
 	}
 
 	private _getValue<T>(resource: URI, position: IPosition | null, section: string | undefined): T {
-		const language = resource ? this.getLanguage(resource, position) : void 0;
+		const language = resource ? this.getLanguage(resource, position) : undefined;
 		if (typeof section === 'undefined') {
 			return this.configurationService.getValue<T>({ resource, overrideIdentifier: language });
 		}