Fix hygiene/compile issues (release/1.26) (#14261)

* Fix hygiene issues

* Fix strict compile

* fixes

* compile fix

* more fixes

* more compile fixes

* last one?!

* fix tests

extensions/azdata/src/common/promise.ts

@@ -8,7 +8,7 @@
  */
 export class Deferred<T> {
 	promise: Promise<T>;
-	resolve!: (value?: T | PromiseLike<T>) => void;
+	resolve!: (value: T | PromiseLike<T>) => void;
 	reject!: (reason?: any) => void;
 	constructor() {
 		this.promise = new Promise<T>((resolve, reject) => {

extensions/azdata/src/common/utils.ts

@@ -22,7 +22,7 @@ export class NoAzdataError extends Error implements azdataExt.ErrorWithLink {
  */
 export function searchForCmd(exe: string): Promise<string> {
 	// Note : This is separated out to allow for easy test stubbing
-	return new Promise<string>((resolve, reject) => which(exe, (err, path) => err ? reject(err) : resolve(path)));
+	return new Promise<string>((resolve, reject) => which(exe, (err, path) => err ? reject(err) : resolve(path || '')));
 }
 
 /**

extensions/azdata/src/test/common/httpClient.test.ts

@@ -52,7 +52,7 @@ describe('HttpClient', function (): void {
 		it('errors on write stream error', async function (): Promise<void> {
 			const downloadFolder = os.tmpdir();
 			const mockWriteStream = new PassThrough();
-			const deferredPromise = new Deferred();
+			const deferredPromise = new Deferred<void>();
 			sinon.stub(fs, 'createWriteStream').callsFake(() => {
 				deferredPromise.resolve();
 				return <any>mockWriteStream;

extensions/azdata/src/test/common/promise.test.ts

@@ -9,7 +9,7 @@ import { Deferred } from '../../common/promise';
 describe('DeferredPromise', function (): void {
 
 	it('Resolves correctly', async function(): Promise<void> {
-		const deferred = new Deferred();
+		const deferred = new Deferred<void>();
 		deferred.resolve();
 		await should(deferred.promise).be.resolved();
 	});
@@ -21,7 +21,7 @@ describe('DeferredPromise', function (): void {
 	});
 
 	it('Chains then correctly', function(done): void {
-		const deferred = new Deferred();
+		const deferred = new Deferred<void>();
 		deferred.then( () => {
 			done();
 		});