From 88540b1adc2387a5eadf6b152e322f3311d94a68 Mon Sep 17 00:00:00 2001
From: sapenlei <2503404258gl@gmail.com>
Date: Fri, 27 Dec 2024 21:10:47 +0800
Subject: [PATCH] fix(plugin-legacy): fix legacy plugin not working in worker
 context

---
 packages/plugin-legacy/src/index.ts       | 7 +++++++
 packages/vite/src/node/plugins/esbuild.ts | 4 ++++
 2 files changed, 11 insertions(+)

diff --git a/packages/plugin-legacy/src/index.ts b/packages/plugin-legacy/src/index.ts
index d356793b231c72..a22d15df2b8084 100644
--- a/packages/plugin-legacy/src/index.ts
+++ b/packages/plugin-legacy/src/index.ts
@@ -270,6 +270,13 @@ function viteLegacyPlugin(options: Options = {}): Plugin[] {
           ),
         )
       }
+      if (config.isWorker) {
+        config.logger.warn(
+          colors.yellow(
+            `Workers are not supported when generating legacy chunks. Ensure that workers are not used in your application when targeting legacy browsers.`,
+          ),
+        )
+      }
     },
   }
 
diff --git a/packages/vite/src/node/plugins/esbuild.ts b/packages/vite/src/node/plugins/esbuild.ts
index 83fa1af4248ab5..ffcfafdf882c0b 100644
--- a/packages/vite/src/node/plugins/esbuild.ts
+++ b/packages/vite/src/node/plugins/esbuild.ts
@@ -336,6 +336,10 @@ export const buildEsbuildPlugin = (): Plugin => {
         return null
       }
 
+      if (chunk.name === 'worker' && opts.format === 'iife') {
+        options.format = 'iife'
+      }
+
       const res = await transformWithEsbuild(
         code,
         chunk.fileName,