diff --git a/.prettierignore b/.prettierignore
index 6b2f0c18894..631b3a02296 100644
--- a/.prettierignore
+++ b/.prettierignore
@@ -83,3 +83,4 @@ AUTHORS.md
 
 # Process a few selected JS files
 !lint-staged.config.js
+!/config/**/*.js
diff --git a/config/formatjs-formatter.js b/config/formatjs-formatter.js
index adb5e82ef73..bf8342d3e35 100644
--- a/config/formatjs-formatter.js
+++ b/config/formatjs-formatter.js
@@ -1,6 +1,8 @@
 const path = require('path');
 
-const currentTranslations = require(path.join(__dirname, "../app/javascript/mastodon/locales/en.json"));
+const currentTranslations = require(
+  path.join(__dirname, '../app/javascript/mastodon/locales/en.json'),
+);
 
 exports.format = (msgs) => {
   const results = {};
diff --git a/config/webpack/configuration.js b/config/webpack/configuration.js
index a647b45992b..9d36abe9ba1 100644
--- a/config/webpack/configuration.js
+++ b/config/webpack/configuration.js
@@ -7,7 +7,9 @@ const { env } = require('process');
 const { load } = require('js-yaml');
 
 const configPath = resolve('config', 'webpacker.yml');
-const settings = load(readFileSync(configPath), 'utf8')[env.RAILS_ENV || env.NODE_ENV];
+const settings = load(readFileSync(configPath), 'utf8')[
+  env.RAILS_ENV || env.NODE_ENV
+];
 
 const themePath = resolve('config', 'themes.yml');
 const themes = load(readFileSync(themePath), 'utf8');
diff --git a/config/webpack/development.js b/config/webpack/development.js
index e3fbfe4b9d5..363a6a53ad5 100644
--- a/config/webpack/development.js
+++ b/config/webpack/development.js
@@ -57,6 +57,6 @@ module.exports = merge(sharedConfig, {
       settings.dev_server.watch_options,
       watchOptions,
     ),
-    writeToDisk: filePath => /ocr/.test(filePath),
+    writeToDisk: (filePath) => /ocr/.test(filePath),
   },
 });
diff --git a/config/webpack/production.js b/config/webpack/production.js
index 7f1ee4a8f9e..3ed4e7baef1 100644
--- a/config/webpack/production.js
+++ b/config/webpack/production.js
@@ -42,24 +42,27 @@ module.exports = merge(sharedConfig, {
       cache: true,
       test: /\.(js|css|html|json|ico|svg|eot|otf|ttf|map)$/,
     }),
-    new BundleAnalyzerPlugin({ // generates report.html
+    new BundleAnalyzerPlugin({
+      // generates report.html
       analyzerMode: 'static',
       openAnalyzer: false,
       logLevel: 'silent', // do not bother Webpacker, who runs with --json and parses stdout
     }),
     new InjectManifest({
-      additionalManifestEntries: ['1f602.svg', 'sheet_13.png'].map((filename) => {
-        const path = resolve(root, 'public', 'emoji', filename);
-        const body = readFileSync(path);
-        const md5  = createHash('md5');
+      additionalManifestEntries: ['1f602.svg', 'sheet_13.png'].map(
+        (filename) => {
+          const path = resolve(root, 'public', 'emoji', filename);
+          const body = readFileSync(path);
+          const md5 = createHash('md5');
 
-        md5.update(body);
+          md5.update(body);
 
-        return {
-          revision: md5.digest('hex'),
-          url: `/emoji/${filename}`,
-        };
-      }),
+          return {
+            revision: md5.digest('hex'),
+            url: `/emoji/${filename}`,
+          };
+        },
+      ),
       exclude: [
         /(?:base|extra)_polyfills-.*\.js$/,
         /locale_.*\.js$/,
@@ -68,7 +71,14 @@ module.exports = merge(sharedConfig, {
       include: [/\.js$/, /\.css$/],
       maximumFileSizeToCacheInBytes: 2 * 1_024 * 1_024, // 2 MiB
       swDest: resolve(root, 'public', 'packs', 'sw.js'),
-      swSrc: resolve(root, 'app', 'javascript', 'mastodon', 'service_worker', 'entry.js'),
+      swSrc: resolve(
+        root,
+        'app',
+        'javascript',
+        'mastodon',
+        'service_worker',
+        'entry.js',
+      ),
     }),
   ],
 });
diff --git a/config/webpack/rules/babel.js b/config/webpack/rules/babel.js
index 902b823e1f8..9b7ff78a20f 100644
--- a/config/webpack/rules/babel.js
+++ b/config/webpack/rules/babel.js
@@ -3,18 +3,18 @@ const { join, resolve } = require('path');
 const { env, settings } = require('../configuration');
 
 // Those modules contain modern ES code that need to be transpiled for Webpack to process it
-const nodeModulesToProcess = [
-  '@reduxjs', 'fuzzysort'
-];
+const nodeModulesToProcess = ['@reduxjs', 'fuzzysort'];
 
 module.exports = {
   test: /\.(js|jsx|mjs|ts|tsx)$/,
   include: [
     settings.source_path,
     ...settings.resolved_paths,
-    ...nodeModulesToProcess.map(p => resolve(`node_modules/${p}`)),
-  ].map(p => resolve(p)),
-  exclude: new RegExp('node_modules\\/(?!(' + nodeModulesToProcess.join('|')+')\\/).*'),
+    ...nodeModulesToProcess.map((p) => resolve(`node_modules/${p}`)),
+  ].map((p) => resolve(p)),
+  exclude: new RegExp(
+    'node_modules\\/(?!(' + nodeModulesToProcess.join('|') + ')\\/).*',
+  ),
   use: [
     {
       loader: 'babel-loader',
diff --git a/config/webpack/shared.js b/config/webpack/shared.js
index 8e77a840a51..2870f7f83a1 100644
--- a/config/webpack/shared.js
+++ b/config/webpack/shared.js
@@ -21,7 +21,8 @@ module.exports = {
     packPaths.reduce((map, entry) => {
       const localMap = map;
       const namespace = relative(join(entryPath), dirname(entry));
-      localMap[join(namespace, basename(entry, extname(entry)))] = resolve(entry);
+      localMap[join(namespace, basename(entry, extname(entry)))] =
+        resolve(entry);
       return localMap;
     }, {}),
     Object.keys(themes).reduce((themePaths, name) => {
@@ -61,19 +62,17 @@ module.exports = {
   },
 
   module: {
-    rules: Object.keys(rules).map(key => rules[key]),
+    rules: Object.keys(rules).map((key) => rules[key]),
     strictExportPresence: true,
   },
 
   plugins: [
     new webpack.EnvironmentPlugin(JSON.parse(JSON.stringify(env))),
-    new webpack.NormalModuleReplacementPlugin(
-      /^history\//, (resource) => {
-        // temporary fix for https://github.com/ReactTraining/react-router/issues/5576
-        // to reduce bundle size
-        resource.request = resource.request.replace(/^history/, 'history/es');
-      },
-    ),
+    new webpack.NormalModuleReplacementPlugin(/^history\//, (resource) => {
+      // temporary fix for https://github.com/ReactTraining/react-router/issues/5576
+      // to reduce bundle size
+      resource.request = resource.request.replace(/^history/, 'history/es');
+    }),
     new MiniCssExtractPlugin({
       filename: 'css/[name]-[contenthash:8].css',
       chunkFilename: 'css/[name]-[contenthash:8].chunk.css',
@@ -87,18 +86,15 @@ module.exports = {
     }),
     new CircularDependencyPlugin({
       failOnError: true,
-    })
+    }),
   ],
 
   resolve: {
     extensions: settings.extensions,
-    modules: [
-      resolve(settings.source_path),
-      'node_modules',
-    ],
+    modules: [resolve(settings.source_path), 'node_modules'],
     alias: {
-      "@": resolve(settings.source_path),
-    }
+      '@': resolve(settings.source_path),
+    },
   },
 
   resolveLoader: {