Fix all typescript errors when compiled in strict mode #1 (#4410)

* few errors

* news entry

* code reviews

Author: Kartik Raj

news/3 Code Health/611.md

@@ -0,0 +1 @@
+Fix all typescript errors when compiled in strict mode

src/client/activation/activationService.ts

@@ -106,8 +106,8 @@ export class LanguageServerExtensionActivationService implements IExtensionActiv
         const activatedWkspcFoldersRemoved = activatedWkspcKeys.filter(item => workspaceKeys.indexOf(item) < 0);
         if (activatedWkspcFoldersRemoved.length > 0) {
             for (const folder of activatedWkspcFoldersRemoved) {
-                this.lsActivatedWorkspaces.get(folder).dispose();
-                this.lsActivatedWorkspaces.delete(folder);
+                this.lsActivatedWorkspaces.get(folder)!.dispose();
+                this.lsActivatedWorkspaces!.delete(folder);
             }
         }
     }

src/client/activation/languageServer/languageServerExtension.ts

@@ -23,7 +23,7 @@ export class LanguageServerExtension implements ILanguageServerExtension {
             this.disposable.dispose();
         }
     }
-    public register(): Promise<void> {
+    public async register(): Promise<void> {
         if (this.disposable) {
             return;
         }

src/client/common/application/types.ts

@@ -47,7 +47,7 @@ import {
 } from 'vscode';
 import * as vsls from 'vsls/vscode';
 
-import { IAsyncDisposable } from '../types';
+import { IAsyncDisposable, Resource } from '../types';
 
 // tslint:disable:no-any unified-signatures
 
@@ -581,7 +581,7 @@ export interface IWorkspaceService {
      * @param uri An uri.
      * @return A workspace folder or `undefined`
      */
-    getWorkspaceFolder(uri: Uri): WorkspaceFolder | undefined;
+    getWorkspaceFolder(uri: Resource): WorkspaceFolder | undefined;
 
     /**
      * Generate a key that's unique to the workspace folder (could be fsPath).

src/client/common/application/workspace.ts

@@ -26,8 +26,8 @@ export class WorkspaceService implements IWorkspaceService {
     public getConfiguration(section?: string, resource?: Uri): WorkspaceConfiguration {
         return workspace.getConfiguration(section, resource);
     }
-    public getWorkspaceFolder(uri: Uri): WorkspaceFolder | undefined {
-        return workspace.getWorkspaceFolder(uri);
+    public getWorkspaceFolder(uri: Resource): WorkspaceFolder | undefined {
+        return uri ? workspace.getWorkspaceFolder(uri) : undefined;
     }
     public asRelativePath(pathOrUri: string | Uri, includeWorkspaceFolder?: boolean): string {
         return workspace.asRelativePath(pathOrUri, includeWorkspaceFolder);

src/client/common/variables/environment.ts

@@ -68,7 +68,7 @@ export function parseEnvFile(
     baseVars?: EnvironmentVariables
 ): EnvironmentVariables {
     const globalVars = baseVars ? baseVars : {};
-    const vars = {};
+    const vars : EnvironmentVariables = {};
     lines.toString().split('\n').forEach((line, idx) => {
         const [name, value] = parseEnvLine(line);
         if (name === '') {

src/client/datascience/cellMatcher.ts

@@ -33,7 +33,7 @@ export class CellMatcher {
     }
 
     public exec(code: string) : string | undefined {
-        let result: RegExpExecArray;
+        let result: RegExpExecArray | null = null;
         if (this.codeMatchRegEx.test(code)) {
             this.codeExecRegEx.lastIndex = -1;
             result = this.codeExecRegEx.exec(code);

src/client/datascience/historyMessageListener.ts

@@ -50,6 +50,6 @@ export class HistoryMessageListener implements IWebPanelMessageListener {
     }
 
     private getHistoryMessages() : string [] {
-        return Object.keys(HistoryMessages).map(k => HistoryMessages[k].toString());
+        return Object.keys(HistoryMessages).map(k => (HistoryMessages as any)[k].toString());
     }
 }

src/client/datascience/liveshare/postOffice.ts

@@ -223,7 +223,7 @@ export class PostOffice implements IAsyncDisposable {
             const jsonArray = JSON.parse(a.args) as JSONArray;
             if (jsonArray !== null && jsonArray.length >= 2) {
                 const firstArg = jsonArray[0]; // More stupid hygiene problems.
-                const command = firstArg !== null ? firstArg.toString() : '';
+                const command = firstArg !== null ? firstArg!.toString() : '';
                 this.postCommand(command, ...jsonArray.slice(1)).ignoreErrors();
             }
         }

src/client/debugger/extension/configuration/resolvers/base.ts

@@ -20,7 +20,7 @@ import { IDebugConfigurationResolver } from '../types';
 
 @injectable()
 export abstract class BaseConfigurationResolver<T extends DebugConfiguration> implements IDebugConfigurationResolver<T> {
-    protected pythonPathSource: PythonPathSource;
+    protected pythonPathSource: PythonPathSource = PythonPathSource.launchJson;
     constructor(protected readonly workspaceService: IWorkspaceService,
         protected readonly documentManager: IDocumentManager,
         protected readonly configurationService: IConfigurationService) { }