diff --git a/wasm/README.md b/wasm/README.md
index cd4c65d16..883424900 100644
--- a/wasm/README.md
+++ b/wasm/README.md
@@ -49,8 +49,8 @@ print(js_vars['a'] * 9)
 `,
     {
         vars: {
-            a: 9
-        }
+            a: 9,
+        },
     }
 );
 ```
diff --git a/wasm/demo/src/index.js b/wasm/demo/src/index.js
index 150fab739..cc604b1d4 100644
--- a/wasm/demo/src/index.js
+++ b/wasm/demo/src/index.js
@@ -11,13 +11,13 @@ let rp;
 
 // A dependency graph that contains any wasm must be imported asynchronously.
 import('rustpython')
-    .then(rustpy => {
+    .then((rustpy) => {
         rp = rustpy;
         // so people can play around with it
         window.rp = rustpy;
         onReady();
     })
-    .catch(e => {
+    .catch((e) => {
         console.error('Error importing `rustpython`:', e);
         document.getElementById('error').textContent = e;
     });
@@ -29,15 +29,15 @@ const editor = CodeMirror.fromTextArea(document.getElementById('code'), {
         'Shift-Tab': 'indentLess',
         'Ctrl-/': 'toggleComment',
         'Cmd-/': 'toggleComment',
-        Tab: editor => {
+        Tab: (editor) => {
             var spaces = Array(editor.getOption('indentUnit') + 1).join(' ');
             editor.replaceSelection(spaces);
-        }
+        },
     },
     lineNumbers: true,
     mode: 'text/x-python',
     indentUnit: 4,
-    autofocus: true
+    autofocus: true,
 });
 
 const consoleElement = document.getElementById('console');
@@ -51,7 +51,7 @@ function runCodeFromTextarea() {
     const code = editor.getValue();
     try {
         rp.pyExec(code, {
-            stdout: output => {
+            stdout: (output) => {
                 const shouldScroll =
                     consoleElement.scrollHeight - consoleElement.scrollTop ===
                     consoleElement.clientHeight;
@@ -59,7 +59,7 @@ function runCodeFromTextarea() {
                 if (shouldScroll) {
                     consoleElement.scrollTop = consoleElement.scrollHeight;
                 }
-            }
+            },
         });
     } catch (err) {
         if (err instanceof WebAssembly.RuntimeError) {
@@ -79,7 +79,7 @@ function updateSnippet() {
     // dynamically.
     // https://webpack.js.org/guides/dependency-management/
     const {
-        default: snippet
+        default: snippet,
     } = require(`raw-loader!../snippets/${selected}.py`);
 
     editor.setValue(snippet);
@@ -148,8 +148,8 @@ function onReady() {
     runCodeFromTextarea();
 
     terminalVM = rp.vmStore.init('term_vm');
-    terminalVM.setStdout(data => localEcho.print(data));
-    readPrompts().catch(err => console.error(err));
+    terminalVM.setStdout((data) => localEcho.print(data));
+    readPrompts().catch((err) => console.error(err));
 
     // so that the test knows that we're ready
     const readyElement = document.createElement('div');
diff --git a/wasm/demo/webpack.config.js b/wasm/demo/webpack.config.js
index 05c9c5999..c431056a7 100644
--- a/wasm/demo/webpack.config.js
+++ b/wasm/demo/webpack.config.js
@@ -11,7 +11,7 @@ module.exports = (env = {}) => {
         entry: './src/index.js',
         output: {
             path: path.join(__dirname, 'dist'),
-            filename: 'index.js'
+            filename: 'index.js',
         },
         mode: 'development',
         resolve: {
@@ -19,16 +19,16 @@ module.exports = (env = {}) => {
                 rustpython: path.resolve(
                     __dirname,
                     env.rustpythonPkg || '../lib/pkg'
-                )
-            }
+                ),
+            },
         },
         module: {
             rules: [
                 {
                     test: /\.css$/,
-                    use: [MiniCssExtractPlugin.loader, 'css-loader']
-                }
-            ]
+                    use: [MiniCssExtractPlugin.loader, 'css-loader'],
+                },
+            ],
         },
         plugins: [
             new CleanWebpackPlugin(),
@@ -38,24 +38,24 @@ module.exports = (env = {}) => {
                 templateParameters: {
                     snippets: fs
                         .readdirSync(path.join(__dirname, 'snippets'))
-                        .map(filename =>
+                        .map((filename) =>
                             path.basename(filename, path.extname(filename))
                         ),
                     defaultSnippetName: 'fibonacci',
                     defaultSnippet: fs.readFileSync(
                         path.join(__dirname, 'snippets/fibonacci.py')
-                    )
-                }
+                    ),
+                },
             }),
             new MiniCssExtractPlugin({
-                filename: 'styles.css'
+                filename: 'styles.css',
             }),
-        ]
+        ],
     };
     if (!env.noWasmPack) {
         config.plugins.push(
             new WasmPackPlugin({
-                crateDirectory: path.join(__dirname, '../lib')
+                crateDirectory: path.join(__dirname, '../lib'),
             })
         );
     }
diff --git a/wasm/example/src/index.js b/wasm/example/src/index.js
index 6480aaf3e..68587d357 100644
--- a/wasm/example/src/index.js
+++ b/wasm/example/src/index.js
@@ -1,6 +1,6 @@
 // A dependency graph that contains any wasm must all be imported
 // asynchronously. This `index.js` file does the single async import, so
 // that no one else needs to worry about it again.
-import('./main.js').catch(e => {
+import('./main.js').catch((e) => {
     console.error('Error importing `main.js`:', e);
 });
diff --git a/wasm/example/webpack.config.js b/wasm/example/webpack.config.js
index 9a6f41e9e..4445c5acd 100644
--- a/wasm/example/webpack.config.js
+++ b/wasm/example/webpack.config.js
@@ -6,7 +6,7 @@ module.exports = {
     output: {
         path: path.join(__dirname, 'dist'),
         filename: 'app.js',
-        publicPath: '/dist/'
+        publicPath: '/dist/',
     },
-    devtool: 'cheap-module-eval-source-map'
+    devtool: 'cheap-module-eval-source-map',
 };
diff --git a/wasm/notebook/snippets/python-js-css/css.css b/wasm/notebook/snippets/python-js-css/css.css
index f35456128..dec37b8c9 100644
--- a/wasm/notebook/snippets/python-js-css/css.css
+++ b/wasm/notebook/snippets/python-js-css/css.css
@@ -6,14 +6,19 @@ h1 {
     font-family: 'Sen', 'sans-serif';
 }
 
-h2, h3, h4, button {
+h2,
+h3,
+h4,
+button {
     font-family: 'Turret Road', cursive;
 }
 
 h1 {
     font-size: 1.5rem;
 }
-h2, h3, h4 {
+h2,
+h3,
+h4 {
     padding-top: 1.25rem;
 }
 
diff --git a/wasm/notebook/src/style.css b/wasm/notebook/src/style.css
index ad1a9f73e..fc1700efd 100644
--- a/wasm/notebook/src/style.css
+++ b/wasm/notebook/src/style.css
@@ -140,7 +140,8 @@ ul.list-inline li {
     height: calc(90vh - 60px);
 }
 
-.CodeMirror, .CodeMirror-wrap {
+.CodeMirror,
+.CodeMirror-wrap {
     height: 100% !important;
 }
 #rp-notebook {
@@ -248,7 +249,6 @@ input[type='url'] {
     .md-flex-grow {
         flex-grow: 1;
     }
-    
 }
 
 @media screen and (max-width: 768px) {
diff --git a/wasm/notebook/webpack.config.js b/wasm/notebook/webpack.config.js
index f07239faf..e6e1aae0d 100644
--- a/wasm/notebook/webpack.config.js
+++ b/wasm/notebook/webpack.config.js
@@ -11,7 +11,7 @@ module.exports = (env = {}) => {
         entry: './src/index.js',
         output: {
             path: path.join(__dirname, 'dist'),
-            filename: 'index.js'
+            filename: 'index.js',
         },
         mode: 'development',
         resolve: {
@@ -19,23 +19,23 @@ module.exports = (env = {}) => {
                 rustpython: path.resolve(
                     __dirname,
                     env.rustpythonPkg || '../lib/pkg'
-                )
-            }
+                ),
+            },
         },
         module: {
             rules: [
                 {
                     test: /\.css$/,
-                    use: [MiniCssExtractPlugin.loader, 'css-loader']
+                    use: [MiniCssExtractPlugin.loader, 'css-loader'],
                 },
                 {
                     test: /\.(woff(2)?|ttf)$/,
                     use: {
-                        loader:"file-loader",
-                        options: { name: "fonts/[name].[ext]" }
+                        loader: 'file-loader',
+                        options: { name: 'fonts/[name].[ext]' },
                     },
-                }
-            ]   
+                },
+            ],
         },
         plugins: [
             new CleanWebpackPlugin(),
@@ -55,15 +55,15 @@ module.exports = (env = {}) => {
                 // }
             }),
             new MiniCssExtractPlugin({
-                filename: 'styles.css'
+                filename: 'styles.css',
             }),
-        ]
+        ],
     };
     if (!env.noWasmPack) {
         config.plugins.push(
             new WasmPackPlugin({
                 crateDirectory: path.join(__dirname, '../lib'),
-                forceMode: 'release'
+                forceMode: 'release',
             })
         );
     }