diff --git a/.changeset/lemon-kings-type.md b/.changeset/lemon-kings-type.md
new file mode 100644
index 00000000000..3e92f301d02
--- /dev/null
+++ b/.changeset/lemon-kings-type.md
@@ -0,0 +1,5 @@
+---
+'@itwin/itwinui-react': minor
+---
+
+Replaced dependency on `tslib` with `@swc/helpers`. This is used mainly by the CommonJS build.
diff --git a/.changeset/strange-spiders-count.md b/.changeset/strange-spiders-count.md
new file mode 100644
index 00000000000..f54f77e3f77
--- /dev/null
+++ b/.changeset/strange-spiders-count.md
@@ -0,0 +1,5 @@
+---
+'@itwin/itwinui-react': patch
+---
+
+The build output is now (again) formatted using `prettier` for easier debugging.
diff --git a/.changeset/witty-ties-protect.md b/.changeset/witty-ties-protect.md
new file mode 100644
index 00000000000..5fb56a14ac9
--- /dev/null
+++ b/.changeset/witty-ties-protect.md
@@ -0,0 +1,5 @@
+---
+'@itwin/itwinui-react': patch
+---
+
+Removed all code comments from the build output.
diff --git a/packages/itwinui-react/package.json b/packages/itwinui-react/package.json
index 19f4d880f24..d22df89035b 100644
--- a/packages/itwinui-react/package.json
+++ b/packages/itwinui-react/package.json
@@ -62,9 +62,10 @@
     "ux"
   ],
   "scripts": {
-    "build": "pnpm clean:build && tsc -p tsconfig.cjs.json && tsc -p tsconfig.esm.json && tsc -p tsconfig.react-table.json && pnpm build:styles && pnpm build:post",
+    "build": "pnpm clean:build && pnpm build:js && pnpm build:styles && pnpm build:types && pnpm build:post",
+    "build:js": "node ./scripts/build.mjs",
+    "build:types": "tsc -p tsconfig.cjs.json && tsc -p tsconfig.esm.json && tsc -p tsconfig.react-table.json",
     "build:styles": "vite build src/styles.js",
-    "build:watch": "concurrently \"tsc -p tsconfig.cjs.json --watch\" \"tsc -p tsconfig.esm.json --watch\"",
     "build:post": "node ./scripts/postBuild.mjs",
     "clean:build": "rimraf esm && rimraf cjs && rimraf react-table.d.ts",
     "clean:coverage": "rimraf coverage",
@@ -85,11 +86,11 @@
   "dependencies": {
     "@floating-ui/react": "^0.26.10",
     "@itwin/itwinui-illustrations-react": "^2.1.0",
+    "@swc/helpers": "^0.5.11",
     "classnames": "^2.3.2",
     "jotai": "^2.8.0",
     "react-table": "^7.8.0",
-    "react-transition-group": "^4.4.5",
-    "tslib": "^2.6.0"
+    "react-transition-group": "^4.4.5"
   },
   "devDependencies": {
     "@swc/cli": "^0.3.12",
diff --git a/packages/itwinui-react/scripts/build.mjs b/packages/itwinui-react/scripts/build.mjs
new file mode 100644
index 00000000000..23675282950
--- /dev/null
+++ b/packages/itwinui-react/scripts/build.mjs
@@ -0,0 +1,41 @@
+/*---------------------------------------------------------------------------------------------
+ * Copyright (c) Bentley Systems, Incorporated. All rights reserved.
+ * See LICENSE.md in the project root for license terms and full copyright notice.
+ *--------------------------------------------------------------------------------------------*/
+import { execSync } from 'node:child_process';
+
+// https://swc.rs/docs/usage/cli
+const swcOptions = {
+  shared: [
+    '--strip-leading-paths',
+    '--no-swcrc',
+    '--ignore **/*.test.*,**/styles.js/*,**/styles*',
+  ].join(' '),
+
+  // https://swc.rs/docs/configuration/compilation
+  compilerOptions: [
+    '',
+    'jsc.parser.syntax=typescript',
+    'jsc.parser.tsx=true',
+    'jsc.transform.react.useBuiltins=true',
+    'jsc.target=es2020',
+    'jsc.minify.format.comments=false',
+    'jsc.externalHelpers=true',
+  ].join(' -C '),
+
+  get esm() {
+    return [this.shared, this.compilerOptions, '-C module.type=es6'].join(' ');
+  },
+
+  get cjs() {
+    return [this.shared, this.compilerOptions, '-C module.type=commonjs'].join(
+      ' ',
+    );
+  },
+};
+
+execSync(`pnpm swc src -d esm ${swcOptions.esm}`);
+console.log('✓ Built esm.');
+
+execSync(`pnpm swc src -d cjs ${swcOptions.cjs}`);
+console.log('✓ Built cjs.');
diff --git a/packages/itwinui-react/scripts/postBuild.mjs b/packages/itwinui-react/scripts/postBuild.mjs
index cf3c4d2b93b..adc2a09caca 100644
--- a/packages/itwinui-react/scripts/postBuild.mjs
+++ b/packages/itwinui-react/scripts/postBuild.mjs
@@ -3,7 +3,7 @@
  * See LICENSE.md in the project root for license terms and full copyright notice.
  *--------------------------------------------------------------------------------------------*/
 import fs from 'node:fs';
-import { exec } from 'node:child_process';
+import { execSync } from 'node:child_process';
 
 // This creates a dummy package.json file in the cjs folder.
 // Without this, all cjs files would need the .cjs extension
@@ -15,10 +15,12 @@ try {
 }
 
 // Run prettier on all compiled output because it gets jumbled by tsc.
-exec('pnpm exec prettier --write "{esm,cjs}/**/*.js"', (error) => {
-  if (error) {
-    console.error('Error when running prettier', error);
-  } else {
-    console.log('✓ Finished compiling @itwin/itwinui-react');
-  }
-});
+try {
+  execSync(
+    'npx prettier --write --ignore-path="../../.gitignore" "{esm,cjs}/**/*.js"',
+  );
+} catch (error) {
+  console.error('Error when running prettier', error);
+}
+
+console.log('\x1b[32m✓ Finished building @itwin/itwinui-react');
diff --git a/packages/itwinui-react/tsconfig.build.json b/packages/itwinui-react/tsconfig.build.json
index 8037e438341..72afa1080f4 100644
--- a/packages/itwinui-react/tsconfig.build.json
+++ b/packages/itwinui-react/tsconfig.build.json
@@ -3,6 +3,6 @@
   "files": ["src/index.ts"],
   "compilerOptions": {
     "noUnusedLocals": false,
-    "importHelpers": true
+    "emitDeclarationOnly": true
   }
 }
diff --git a/pnpm-lock.yaml b/pnpm-lock.yaml
index fcef170bc98..97ad7f6b863 100644
--- a/pnpm-lock.yaml
+++ b/pnpm-lock.yaml
@@ -126,7 +126,7 @@ importers:
         version: link:../../packages/itwinui-variables
       '@ladle/react':
         specifier: ^4.0.2
-        version: 4.0.2(@swc/helpers@0.5.5)(@types/node@18.17.19)(@types/react@18.2.14)(lightningcss@1.25.0)(react-dom@18.2.0(react@18.2.0))(react@18.2.0)(sass@1.72.0)(typescript@5.1.6)
+        version: 4.0.2(@swc/helpers@0.5.11)(@types/node@18.17.19)(@types/react@18.2.14)(lightningcss@1.25.0)(react-dom@18.2.0(react@18.2.0))(react@18.2.0)(sass@1.72.0)(typescript@5.1.6)
       '@types/node':
         specifier: '*'
         version: 18.17.19
@@ -339,6 +339,9 @@ importers:
       '@itwin/itwinui-illustrations-react':
         specifier: ^2.1.0
         version: 2.1.0(react-dom@18.2.0(react@18.2.0))(react@18.2.0)
+      '@swc/helpers':
+        specifier: ^0.5.11
+        version: 0.5.11
       classnames:
         specifier: ^2.3.2
         version: 2.3.2
@@ -351,16 +354,13 @@ importers:
       react-transition-group:
         specifier: ^4.4.5
         version: 4.4.5(react-dom@18.2.0(react@18.2.0))(react@18.2.0)
-      tslib:
-        specifier: ^2.6.0
-        version: 2.6.1
     devDependencies:
       '@swc/cli':
         specifier: ^0.3.12
-        version: 0.3.12(@swc/core@1.5.28(@swc/helpers@0.5.5))(chokidar@3.6.0)
+        version: 0.3.12(@swc/core@1.5.28(@swc/helpers@0.5.11))(chokidar@3.6.0)
       '@swc/core':
         specifier: ^1.5.28
-        version: 1.5.28(@swc/helpers@0.5.5)
+        version: 1.5.28(@swc/helpers@0.5.11)
       '@testing-library/jest-dom':
         specifier: ^6.3.0
         version: 6.3.0(vitest@1.2.1(@types/node@18.17.19)(jsdom@24.0.0)(lightningcss@1.25.0)(sass@1.72.0))
@@ -3185,6 +3185,12 @@ packages:
         integrity: sha512-e2BR4lsJkkRlKZ/qCHPw9ZaSxc0MVUd7gtbtaB7aMvHeJVYe8sOB8DBZkP2DtISHGSku9sCK6T6cnY0CtXrOCQ==,
       }
 
+  '@swc/helpers@0.5.11':
+    resolution:
+      {
+        integrity: sha512-YNlnKRWF2sVojTpIyzwou9XoTNbzbzONwRhOoniEioF1AtaitTvVZblaQRrAzChWQ1bLYyYSWzM18y4WwgzJ+A==,
+      }
+
   '@swc/helpers@0.5.5':
     resolution:
       {
@@ -15161,7 +15167,7 @@ snapshots:
       react: 18.2.0
       react-dom: 18.2.0(react@18.2.0)
 
-  '@ladle/react@4.0.2(@swc/helpers@0.5.5)(@types/node@18.17.19)(@types/react@18.2.14)(lightningcss@1.25.0)(react-dom@18.2.0(react@18.2.0))(react@18.2.0)(sass@1.72.0)(typescript@5.1.6)':
+  '@ladle/react@4.0.2(@swc/helpers@0.5.11)(@types/node@18.17.19)(@types/react@18.2.14)(lightningcss@1.25.0)(react-dom@18.2.0(react@18.2.0))(react@18.2.0)(sass@1.72.0)(typescript@5.1.6)':
     dependencies:
       '@babel/code-frame': 7.23.5
       '@babel/core': 7.23.6
@@ -15174,7 +15180,7 @@ snapshots:
       '@mdx-js/mdx': 3.0.0
       '@mdx-js/react': 3.0.0(@types/react@18.2.14)(react@18.2.0)
       '@vitejs/plugin-react': 4.2.1(vite@5.1.7(@types/node@18.17.19)(lightningcss@1.25.0)(sass@1.72.0))
-      '@vitejs/plugin-react-swc': 3.5.0(@swc/helpers@0.5.5)(vite@5.1.7(@types/node@18.17.19)(lightningcss@1.25.0)(sass@1.72.0))
+      '@vitejs/plugin-react-swc': 3.5.0(@swc/helpers@0.5.11)(vite@5.1.7(@types/node@18.17.19)(lightningcss@1.25.0)(sass@1.72.0))
       axe-core: 4.8.2
       boxen: 7.1.1
       chokidar: 3.5.3
@@ -15870,10 +15876,10 @@ snapshots:
 
   '@sindresorhus/merge-streams@1.0.0': {}
 
-  '@swc/cli@0.3.12(@swc/core@1.5.28(@swc/helpers@0.5.5))(chokidar@3.6.0)':
+  '@swc/cli@0.3.12(@swc/core@1.5.28(@swc/helpers@0.5.11))(chokidar@3.6.0)':
     dependencies:
       '@mole-inc/bin-wrapper': 8.0.1
-      '@swc/core': 1.5.28(@swc/helpers@0.5.5)
+      '@swc/core': 1.5.28(@swc/helpers@0.5.11)
       '@swc/counter': 0.1.3
       commander: 8.3.0
       fast-glob: 3.3.2
@@ -15915,7 +15921,7 @@ snapshots:
   '@swc/core-win32-x64-msvc@1.5.28':
     optional: true
 
-  '@swc/core@1.5.28(@swc/helpers@0.5.5)':
+  '@swc/core@1.5.28(@swc/helpers@0.5.11)':
     dependencies:
       '@swc/counter': 0.1.3
       '@swc/types': 0.1.8
@@ -15930,10 +15936,14 @@ snapshots:
       '@swc/core-win32-arm64-msvc': 1.5.28
       '@swc/core-win32-ia32-msvc': 1.5.28
       '@swc/core-win32-x64-msvc': 1.5.28
-      '@swc/helpers': 0.5.5
+      '@swc/helpers': 0.5.11
 
   '@swc/counter@0.1.3': {}
 
+  '@swc/helpers@0.5.11':
+    dependencies:
+      tslib: 2.6.1
+
   '@swc/helpers@0.5.5':
     dependencies:
       '@swc/counter': 0.1.3
@@ -16314,9 +16324,9 @@ snapshots:
 
   '@vanilla-extract/private@1.0.3': {}
 
-  '@vitejs/plugin-react-swc@3.5.0(@swc/helpers@0.5.5)(vite@5.1.7(@types/node@18.17.19)(lightningcss@1.25.0)(sass@1.72.0))':
+  '@vitejs/plugin-react-swc@3.5.0(@swc/helpers@0.5.11)(vite@5.1.7(@types/node@18.17.19)(lightningcss@1.25.0)(sass@1.72.0))':
     dependencies:
-      '@swc/core': 1.5.28(@swc/helpers@0.5.5)
+      '@swc/core': 1.5.28(@swc/helpers@0.5.11)
       vite: 5.1.7(@types/node@18.17.19)(lightningcss@1.25.0)(sass@1.72.0)
     transitivePeerDependencies:
       - '@swc/helpers'