diff --git a/build/lib/extensions.js b/build/lib/extensions.js
index 33c089de720..638ff16732c 100644
--- a/build/lib/extensions.js
+++ b/build/lib/extensions.js
@@ -511,12 +511,12 @@ function translatePackageJSON(packageJSON, packageNLSPath) {
 const extensionsPath = path_1.default.join(root, 'extensions');
 // Additional projects to run esbuild on. These typically build code for webviews
 const esbuildMediaScripts = [
-    'markdown-language-features/esbuild-notebook.js',
-    'markdown-language-features/esbuild-preview.js',
-    'markdown-math/esbuild.js',
-    'notebook-renderers/esbuild.js',
-    'ipynb/esbuild.js',
-    'simple-browser/esbuild-preview.js',
+    'markdown-language-features/esbuild-notebook.mjs',
+    'markdown-language-features/esbuild-preview.mjs',
+    'markdown-math/esbuild.mjs',
+    'notebook-renderers/esbuild.mjs',
+    'ipynb/esbuild.mjs',
+    'simple-browser/esbuild-preview.mjs',
 ];
 async function webpackExtensions(taskName, isWatch, webpackConfigLocations) {
     const webpack = require('webpack');
diff --git a/build/lib/extensions.ts b/build/lib/extensions.ts
index 1a55acc52cf..d23e7472060 100644
--- a/build/lib/extensions.ts
+++ b/build/lib/extensions.ts
@@ -561,12 +561,12 @@ const extensionsPath = path.join(root, 'extensions');
 
 // Additional projects to run esbuild on. These typically build code for webviews
 const esbuildMediaScripts = [
-	'markdown-language-features/esbuild-notebook.js',
-	'markdown-language-features/esbuild-preview.js',
-	'markdown-math/esbuild.js',
-	'notebook-renderers/esbuild.js',
-	'ipynb/esbuild.js',
-	'simple-browser/esbuild-preview.js',
+	'markdown-language-features/esbuild-notebook.mjs',
+	'markdown-language-features/esbuild-preview.mjs',
+	'markdown-math/esbuild.mjs',
+	'notebook-renderers/esbuild.mjs',
+	'ipynb/esbuild.mjs',
+	'simple-browser/esbuild-preview.mjs',
 ];
 
 export async function webpackExtensions(taskName: string, isWatch: boolean, webpackConfigLocations: { configPath: string; outputRoot?: string }[]) {
diff --git a/extensions/ipynb/.vscodeignore b/extensions/ipynb/.vscodeignore
index 2d13f5a0c22..543420a2de0 100644
--- a/extensions/ipynb/.vscodeignore
+++ b/extensions/ipynb/.vscodeignore
@@ -7,4 +7,4 @@ extension.webpack.config.js
 extension-browser.webpack.config.js
 package-lock.json
 .gitignore
-esbuild.js
+esbuild.*
diff --git a/extensions/markdown-math/.vscodeignore b/extensions/markdown-math/.vscodeignore
index 85f550b7d7b..5df4a1cb8ab 100644
--- a/extensions/markdown-math/.vscodeignore
+++ b/extensions/markdown-math/.vscodeignore
@@ -2,7 +2,7 @@ src/**
 notebook/**
 extension-browser.webpack.config.js
 extension.webpack.config.js
-esbuild.js
+esbuild.*
 cgmanifest.json
 package-lock.json
 webpack.config.js
diff --git a/extensions/notebook-renderers/.vscodeignore b/extensions/notebook-renderers/.vscodeignore
index e168400f68e..d8277ac1813 100644
--- a/extensions/notebook-renderers/.vscodeignore
+++ b/extensions/notebook-renderers/.vscodeignore
@@ -2,5 +2,5 @@ src/**
 notebook/**
 tsconfig.json
 .gitignore
-esbuild.js
+esbuild.*
 src/**