For let -> For const

extensions/typescript/src/features/documentSymbolProvider.ts

@@ -76,7 +76,7 @@ export default class TypeScriptDocumentSymbolProvider implements DocumentSymbolP
 			bucket.push(result);
 		}
 		if (item.childItems && item.childItems.length > 0) {
-			for (let child of item.childItems) {
+			for (const child of item.childItems) {
 				TypeScriptDocumentSymbolProvider.convertNavBar(resource, realIndent + 1, foldingMap, bucket, child, item.text);
 			}
 		}

extensions/typescript/src/features/formattingProvider.ts

@@ -89,7 +89,7 @@ export class TypeScriptFormattingProvider implements DocumentRangeFormattingEdit
 			if (!edits) {
 				return result;
 			}
-			for (let edit of edits) {
+			for (const edit of edits) {
 				let textEdit = this.codeEdit2SingleEditOperation(edit);
 				let range = textEdit.range;
 				// Work around for https://github.com/Microsoft/TypeScript/issues/6700.

extensions/typescript/src/typeScriptServiceClientHost.ts

@@ -246,7 +246,7 @@ export default class TypeScriptServiceClientHost implements ITypeScriptServiceCl
 
 	private createMarkerDatas(diagnostics: Proto.Diagnostic[], source: string): Diagnostic[] {
 		const result: Diagnostic[] = [];
-		for (let diagnostic of diagnostics) {
+		for (const diagnostic of diagnostics) {
 			const { start, end, text } = diagnostic;
 			const range = new Range(tsLocationToVsPosition(start), tsLocationToVsPosition(end));
 			const converted = new Diagnostic(range, text);

extensions/typescript/src/utils/projectStatus.ts

@@ -205,7 +205,7 @@ function computeLargeRoots(configFileName: string, fileNames: string[]): string[
 
 	// console.log(dir, fileNames);
 
-	for (let fileName of fileNames) {
+	for (const fileName of fileNames) {
 		if (fileName.indexOf(dir) === 0) {
 			let first = fileName.substring(dir.length + 1);
 			first = first.substring(0, first.indexOf('/'));
@@ -226,7 +226,7 @@ function computeLargeRoots(configFileName: string, fileNames: string[]): string[
 
 	let result: string[] = [];
 	let sum = 0;
-	for (let e of data) {
+	for (const e of data) {
 		sum += e.count;
 		result.push(e.root);
 		if (fileNames.length - sum < fileLimit) {