Investigate Size Change action minification (#736)

feat: use minified builds for bundle size comparisons

Add build:minified scripts that enable minification during builds,
and configure the compressed-size-action to use these scripts.

This ensures that bundle size measurements in PRs reflect actual
code changes rather than being inflated by comments and whitespace,
while keeping the published packages readable and unminified.

Changes:
- Add build:minified script to root package.json
- Add build:minified scripts to @tanstack/db and @tanstack/react-db
- Configure compressed-size-action to use build:minified script

Co-authored-by: Claude <noreply@anthropic.com>

Author: KyleAMathews

.github/workflows/pr.yml

@@ -54,12 +54,14 @@ jobs:
           repo-token: "${{ secrets.GITHUB_TOKEN }}"
           pattern: "./packages/db/dist/**/*.{js,mjs}"
           comment-key: "db-package-size"
+          build-script: "build:minified"
       - name: Compressed Size Action - React DB Package
         uses: preactjs/compressed-size-action@v2
         with:
           repo-token: "${{ secrets.GITHUB_TOKEN }}"
           pattern: "./packages/react-db/dist/**/*.{js,mjs}"
           comment-key: "react-db-package-size"
+          build-script: "build:minified"
   build-example:
     name: Build Example Site
     runs-on: ubuntu-latest

package.json

@@ -9,6 +9,7 @@
   "type": "module",
   "scripts": {
     "build": "pnpm --filter \"./packages/**\" build",
+    "build:minified": "pnpm --filter \"./packages/**\" build:minified",
     "changeset": "changeset",
     "changeset:publish": "changeset publish",
     "changeset:version": "changeset version && pnpm install --no-frozen-lockfile",

packages/db/package.json

@@ -49,6 +49,7 @@
   ],
   "scripts": {
     "build": "vite build",
+    "build:minified": "vite build --minify",
     "dev": "vite build --watch",
     "lint": "eslint . --fix",
     "test": "npx vitest --run"

packages/react-db/package.json

@@ -54,6 +54,7 @@
   },
   "scripts": {
     "build": "vite build",
+    "build:minified": "vite build --minify",
     "dev": "vite build --watch",
     "test": "npx vitest --run",
     "lint": "eslint . --fix"