diff --git a/generators/app/package.json b/generators/app/package.json
index 9353dc93..70706604 100644
--- a/generators/app/package.json
+++ b/generators/app/package.json
@@ -7,6 +7,7 @@
         "@types/glob": "^7.2.0",
         "@types/mocha": "^9.1.0",
         "@types/node": "14.x",
+        "@types/source-map-support": "^0.5.4",
         "@typescript-eslint/eslint-plugin": "^5.12.1",
         "@typescript-eslint/parser": "^5.12.1",
         "eslint": "^8.9.0",
@@ -20,6 +21,7 @@
         "concurrently": "^5.3.0",
         "css-loader": "^4.2.0",
         "fork-ts-checker-webpack-plugin": "^5.0.14",
+        "source-map-support": "^0.5.21",
         "style-loader": "^1.2.1",
         "ts-loader": "^9.2.6",
         "vscode-dts": "^0.3.3",
diff --git a/generators/app/templates/ext-command-ts/package.json b/generators/app/templates/ext-command-ts/package.json
index 771519d7..00cfdfcb 100644
--- a/generators/app/templates/ext-command-ts/package.json
+++ b/generators/app/templates/ext-command-ts/package.json
@@ -36,11 +36,13 @@
 		<%- dep("@types/glob") %>,
 		<%- dep("@types/mocha") %>,
 		<%- dep("@types/node") %>,
+		<%- dep("@types/source-map-support") %>,
 		<%- dep("@typescript-eslint/eslint-plugin") %>,
 		<%- dep("@typescript-eslint/parser") %>,
 		<%- dep("eslint") %>,
 		<%- dep("glob") %>,
 		<%- dep("mocha") %>,
+		<%- dep("source-map-support") %>,
 		<%- dep("typescript") %>,
 		<%- dep("@vscode/test-electron") %><% if (insiders) { %>,
 		<%- dep("vscode-dts") %><% } %>
diff --git a/generators/app/templates/ext-command-ts/src/test/suite/index.ts b/generators/app/templates/ext-command-ts/src/test/suite/index.ts
index 7029e38e..be9808b9 100644
--- a/generators/app/templates/ext-command-ts/src/test/suite/index.ts
+++ b/generators/app/templates/ext-command-ts/src/test/suite/index.ts
@@ -1,8 +1,12 @@
 import * as path from 'path';
 import * as Mocha from 'mocha';
 import * as glob from 'glob';
+import * as sm from 'source-map-support';
 
 export function run(): Promise<void> {
+	// Install support for source map files in stack traces.
+	sm.install();
+
 	// Create the mocha test
 	const mocha = new Mocha({
 		ui: 'tdd',
diff --git a/generators/app/templates/ext-command-ts/vscode-webpack/package.json b/generators/app/templates/ext-command-ts/vscode-webpack/package.json
index fc2855ce..f33b7db4 100644
--- a/generators/app/templates/ext-command-ts/vscode-webpack/package.json
+++ b/generators/app/templates/ext-command-ts/vscode-webpack/package.json
@@ -39,11 +39,13 @@
 		<%- dep("@types/glob") %>,
 		<%- dep("@types/mocha") %>,
 		<%- dep("@types/node") %>,
+		<%- dep("@types/source-map-support") %>,
 		<%- dep("@typescript-eslint/eslint-plugin") %>,
 		<%- dep("@typescript-eslint/parser") %>,
 		<%- dep("eslint") %>,
 		<%- dep("glob") %>,
 		<%- dep("mocha") %>,
+		<%- dep("source-map-support") %>,
 		<%- dep("typescript") %>,
 		<%- dep("ts-loader") %>,
 		<%- dep("webpack") %>,
diff --git a/generators/app/templates/ext-notebook-renderer/src/test/suite/index.ts b/generators/app/templates/ext-notebook-renderer/src/test/suite/index.ts
index d82c1e24..b1ccdf7f 100644
--- a/generators/app/templates/ext-notebook-renderer/src/test/suite/index.ts
+++ b/generators/app/templates/ext-notebook-renderer/src/test/suite/index.ts
@@ -1,8 +1,12 @@
 import * as path from 'path';
 import * as Mocha from 'mocha';
 import * as glob from 'glob';
+import * as sm from 'source-map-support';
 
 export function run(): Promise<void> {
+  // Install support for source map files in stack traces.
+  sm.install();
+
   // Create the mocha test
   const mocha = new Mocha({
     ui: 'tdd',