ci: automatically regenerate `package.json.buildonly` (#7198)

.github/workflows/webapp.yml

@@ -111,6 +111,7 @@ jobs:
           echo
           echo Please undo your changes to these files:
           git diff --exit-code --name-only --merge-base "origin/$GITHUB_BASE_REF" -- \
+              web/package.json.buildonly \
               web/public_html/transmission-app.css \
               web/public_html/transmission-app.css.LEGAL.txt \
               web/public_html/transmission-app.css.map \
@@ -140,6 +141,7 @@ jobs:
           set -e # abort if any command fails
           npm --prefix web ci
           npm --prefix web run build
+          npm --prefix web run generate-buildonly
           git diff --name-only
           git add --update web
       - name: Create pull request

web/generate-buildonly.js

@@ -0,0 +1,24 @@
+import fs from 'node:fs';
+import path from 'node:path';
+
+const __dirname = import.meta.dirname;
+const obj = JSON.parse(
+  fs.readFileSync(path.join(__dirname, 'package.json'), 'utf8'),
+);
+
+obj.scripts = (({ build }) => {
+  return { build };
+})(obj.scripts);
+
+obj.devDependencies = (({
+  esbuild,
+  'esbuild-sass-plugin': esbuild_saas_plugin,
+}) => {
+  return { esbuild, 'esbuild-sass-plugin': esbuild_saas_plugin };
+})(obj.devDependencies);
+
+// the replace() call adds a trailing newline if it doesn't exist
+fs.writeFileSync(
+  path.join(__dirname, 'package.json.buildonly'),
+  JSON.stringify(obj, null, 2).replace(/^(.*?[^\n])$/s, '$1\n'),
+);

web/package.json

@@ -6,6 +6,7 @@
   "scripts": {
     "build": "node esbuild.mjs",
     "dev": "DEV=true node esbuild.mjs",
+    "generate-buildonly": "node generate-buildonly.js",
     "lint": "run-p --silent lint:eslint lint:stylelint lint:prettier",
     "lint:fix": "run-s lint:eslint:fix lint:stylelint:fix lint:prettier:fix",
     "lint:eslint": "eslint src/*.js",