chore: restore build_smoke_test

frontend/react/BUILD.bazel

@@ -1,4 +1,4 @@
-load("@aspect_rules_js//js:defs.bzl", "js_library", "js_run_binary", "js_run_devserver")
+load("@aspect_rules_js//js:defs.bzl", "js_library", "js_run_binary", "js_run_devserver", "js_test")
 load("@aspect_rules_ts//ts:defs.bzl", "ts_config")
 load("@npm//:defs.bzl", "npm_link_all_packages")
 load("@npm//react:tsconfig-to-swcconfig/package_json.bzl", tsconfig_to_swcconfig = "bin")
@@ -83,3 +83,12 @@ bin.vite_binary(
     chdir = package_name(),
     data = [":build"],
 )
+
+# Just verify that the bundle produced "something reasonable" but doesn't verify it functions in a browser.
+# TODO: use something like Cypress for a true end-to-end test
+js_test(
+    name = "build_smoke_test",
+    timeout = "short",
+    data = [":build"],
+    entry_point = "build_smoke_test.js",
+)

frontend/react/build_smoke_test.js

@@ -1,7 +1,7 @@
 const assert = require('assert');
 const fs = require('fs');
 
-// Make sure there's a file like build/static/js/main.12345678.js
-const files = fs.readdirSync('react/build/static/js');
+// Make sure there's a file like react/dist/assets/index.12345678.js
+const files = fs.readdirSync('react/dist/assets');
 console.log(files);
-assert.ok(files.some((f) => /main\.[0-9a-f]{8}\.js/.test(f)));
+assert.ok(files.some((f) => /index\.[0-9a-f]{8}\.js/.test(f)));