diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
index fa85c55332e..450f2c18600 100644
--- a/.github/workflows/ci.yml
+++ b/.github/workflows/ci.yml
@@ -16,6 +16,9 @@ jobs:
             - name: Install dependencies
               run: bun install --frozen-lockfile
 
+            - name: Build packages
+              run: bun run build:packages
+
             - name: Run tests
               run: bun run test
 
diff --git a/package.json b/package.json
index cf3b3f2b0e2..a99a3ccb388 100644
--- a/package.json
+++ b/package.json
@@ -7,7 +7,7 @@
     "node": ">=22.0"
   },
   "scripts": {
-    "build": "storybook build -o storybook-static",
+    "build": "storybook build -o storybook-static --stats-json",
     "build:packages": "bun run build:colours && bun run build:components && bun run build:charts",
     "build:colours": "cd packages/colours && bun run build",
     "build:components": "cd packages/components && bun run build",
diff --git a/packages/charts/build.ts b/packages/charts/build.ts
index 8b174060f27..9606ca07512 100644
--- a/packages/charts/build.ts
+++ b/packages/charts/build.ts
@@ -38,15 +38,19 @@ const transpileFile = async (srcPath: string, destPath: string) => {
     const result = await transform(content, {
         loader: isTsx ? "tsx" : "ts",
         format: "esm",
-        target: "esnext",
+        target: "es2022",
+        jsx: "automatic",
         sourcemap: "external",
         sourcefile: srcPath,
-        // Use legacy decorators mode for compatibility with mobx-react
+        // Emit native TC-39 stage 3 decorators. The codebase mixes mobx
+        // decorators (@computed, @action) with stage-3-style ones (@bind in
+        // utils/Util.ts), so the legacy emit path produces output that calls
+        // stage-3 decorators with legacy arguments at runtime. Stage 3 emit
+        // is what Storybook uses and matches the source authoring style.
         tsconfigRaw: {
             compilerOptions: {
-                experimentalDecorators: true,
-                emitDecoratorMetadata: false,
-                useDefineForClassFields: false,
+                experimentalDecorators: false,
+                useDefineForClassFields: true,
             },
         },
     })
diff --git a/packages/charts/package.json b/packages/charts/package.json
index b651cd1702a..a066eed337d 100644
--- a/packages/charts/package.json
+++ b/packages/charts/package.json
@@ -1,6 +1,6 @@
 {
   "name": "@buildcanada/charts",
-  "version": "0.3.8",
+  "version": "0.3.9",
   "description": "A configurable data visualization library for creating interactive charts.",
   "type": "module",
   "main": "./dist/index.js",