diff --git a/extensions/postinstall.js b/extensions/postinstall.js
index 875ad709df21b..e31009ac6b84a 100644
--- a/extensions/postinstall.js
+++ b/extensions/postinstall.js
@@ -7,13 +7,17 @@
 
 const fs = require('fs');
 const path = require('path');
-const toDelete = new Set(['tsc.js', 'tsserverlibrary.js', 'typescript.js', 'typescriptServices.js']);
+const toDelete = new Set(['tsc.js', 'tsserverlibrary.js', 'typescriptServices.js']);
 
 const root = path.join(__dirname, 'node_modules', 'typescript', 'lib');
 for (let name of fs.readdirSync(root)) {
 	if (name === 'lib.d.ts' || name.match(/^lib\..*\.d\.ts$/) || name === 'protocol.d.ts') {
 		continue;
 	}
+	if (name === 'typescript.js' || name === 'typescript.d.ts') {
+		// used by html and extension editing
+		continue;
+	}
 
 	if (toDelete.has(name) || name.match(/\.d\.ts$/)) {
 		try {