fix: detect plugin without extension (#4579)

packages/builder/src/builder.js

@@ -123,7 +123,7 @@ export default class Builder {
   resolvePlugins() {
     // Check plugins exist then set alias to their real path
     return Promise.all(this.plugins.map(async (p) => {
-      const ext = path.extname(p.src) ? '' : '{.+([^.]),/index.+([^.])}'
+      const ext = '{?(.+([^.])),/index.+([^.])}'
       const pluginFiles = await glob(`${p.src}${ext}`)
 
       if (!pluginFiles || pluginFiles.length === 0) {

test/fixtures/with-config/nuxt.config.js

@@ -37,6 +37,7 @@ export default {
   extensions: 'ts',
   plugins: [
     '~/plugins/test',
+    '~/plugins/test.plugin',
     { src: '~/plugins/only-client.js', ssr: false }
   ],
   loading: '~/components/loading',

test/fixtures/with-config/plugins/test.plugin.js

@@ -0,0 +1,5 @@
+if (process.client) {
+  window.__test_plugin_ext = true
+} else {
+  global.__test_plugin_ext = true
+}

test/unit/with-config.test.js

@@ -90,6 +90,7 @@ describe('with-config', () => {
     expect(html).toContain('<h1>I have custom configurations</h1>')
 
     expect(window.__test_plugin).toBe(true)
+    expect(window.__test_plugin_ext).toBe(true)
   })
 
   test('/test/about (custom layout)', async () => {