Implement a no sync rule (#7216)

* implement a no sync rule

* fix linting disable

* fix unused imports

* exclude more testing

* clean up fs usage

* clean up more fs usage

* remove duplicate of code

* fix compile errors

extensions/mssql/src/utils.ts

@@ -10,8 +10,7 @@ import * as crypto from 'crypto';
 import * as os from 'os';
 import * as findRemoveSync from 'find-remove';
 import * as constants from './constants';
-import * as fs from 'fs';
-import { promisify } from 'util';
+import { promises as fs } from 'fs';
 
 const configTracingLevel = 'tracingLevel';
 const configLogRetentionMinutes = 'logRetentionMinutes';
@@ -31,17 +30,6 @@ export function getAppDataPath() {
 	}
 }
 
-export namespace pfs {
-
-	export function exists(path: string): Promise<boolean> {
-		return promisify(fs.exists)(path);
-	}
-
-	export function mkdir(path: string, mode?: number): Promise<void> {
-		return promisify(fs.mkdir)(path, mode);
-	}
-}
-
 /**
  * Get a file name that is not already used in the target directory
  * @param filePath source notebook file name
@@ -61,14 +49,6 @@ export function findNextUntitledEditorName(filePath: string): string {
 	return title;
 }
 
-export function fileExists(file: string): boolean {
-	return fs.existsSync(file);
-}
-
-export function copyFile(source: string, target: string): void {
-	fs.copyFileSync(source, target);
-}
-
 export function removeOldLogFiles(logPath: string, prefix: string): JSON {
 	return findRemoveSync(logPath, { age: { seconds: getConfigLogRetentionSeconds() }, limit: getConfigLogFilesRemovalLimit() });
 }
@@ -303,3 +283,12 @@ export function logDebug(msg: any): void {
 		console.log(outputMsg);
 	}
 }
+
+export async function exists(path: string): Promise<boolean> {
+	try {
+		await fs.access(path);
+		return true;
+	} catch (e) {
+		return false;
+	}
+}