Create an app only when needed

build/msw_plugin.js

@@ -0,0 +1,28 @@
+import { resolve } from 'node:path'
+import { readFile } from 'node:fs/promises'
+
+const target = 'node_modules/msw/lib/mockServiceWorker.js'
+
+const mswPlugin = () => {
+  let projectRoot
+  return {
+    name: 'msw-plugin',
+    apply: 'serve',
+    configResolved (conf) {
+      projectRoot = conf.root
+    },
+    configureServer (server) {
+      server.middlewares.use(async (req, res, next) => {
+        if (req.path === '/mockServiceWorker.js') {
+          const file = await readFile(resolve(projectRoot, target))
+          res.set('Content-Type', 'text/javascript')
+          res.send(file)
+        } else {
+          next()
+        }
+      })
+    }
+  }
+}
+
+export default mswPlugin