From 5dfd0e85978f77c8d12f7b83f25a383ae9c2f7e9 Mon Sep 17 00:00:00 2001
From: liuwei <wei2460@qq.com>
Date: Sat, 10 Apr 2021 04:15:14 +0800
Subject: [PATCH] feat(plugin): plugin config hook supports return promise
 (#2800)

---
 packages/vite/src/node/config.ts | 6 +++---
 packages/vite/src/node/plugin.ts | 5 ++++-
 2 files changed, 7 insertions(+), 4 deletions(-)

diff --git a/packages/vite/src/node/config.ts b/packages/vite/src/node/config.ts
index dc9ce6c0952064..be6a99b049e73e 100644
--- a/packages/vite/src/node/config.ts
+++ b/packages/vite/src/node/config.ts
@@ -242,14 +242,14 @@ export async function resolveConfig(
 
   // run config hooks
   const userPlugins = [...prePlugins, ...normalPlugins, ...postPlugins]
-  userPlugins.forEach((p) => {
+  for (const p of userPlugins) {
     if (p.config) {
-      const res = p.config(config, configEnv)
+      const res = await p.config(config, configEnv)
       if (res) {
         config = mergeConfig(config, res)
       }
     }
-  })
+  }
 
   // resolve root
   const resolvedRoot = normalizePath(
diff --git a/packages/vite/src/node/plugin.ts b/packages/vite/src/node/plugin.ts
index 7bef2402de4729..4f13439604f86e 100644
--- a/packages/vite/src/node/plugin.ts
+++ b/packages/vite/src/node/plugin.ts
@@ -61,7 +61,10 @@ export interface Plugin extends RollupPlugin {
    * Note: User plugins are resolved before running this hook so injecting other
    * plugins inside  the `config` hook will have no effect.
    */
-  config?: (config: UserConfig, env: ConfigEnv) => UserConfig | null | void
+  config?: (
+    config: UserConfig,
+    env: ConfigEnv
+  ) => UserConfig | null | void | Promise<UserConfig | null | void>
   /**
    * Use this hook to read and store the final resolved vite config.
    */