From 69cc27cec093d3c3977fbb7fdcc466251b8b9359 Mon Sep 17 00:00:00 2001
From: sapphi-red <green@sapphi.red>
Date: Mon, 3 Apr 2023 19:56:15 +0900
Subject: [PATCH] perf: cache load plugin

---
 packages/plugin-react/src/index.ts | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/packages/plugin-react/src/index.ts b/packages/plugin-react/src/index.ts
index 09e54e90c..50bf6556c 100644
--- a/packages/plugin-react/src/index.ts
+++ b/packages/plugin-react/src/index.ts
@@ -435,8 +435,18 @@ export default function viteReact(opts: Options = {}): PluginOption[] {
 
 viteReact.preambleCode = preambleCode
 
-function loadPlugin(path: string): Promise<any> {
-  return import(path).then((module) => module.default || module)
+const loadedPlugin = new Map<string, any>()
+function loadPlugin(path: string): any {
+  const cached = loadedPlugin.get(path)
+  if (cached) return cached
+
+  const promise = import(path).then((module) => {
+    const value = module.default || module
+    loadedPlugin.set(path, value)
+    return value
+  })
+  loadedPlugin.set(path, promise)
+  return promise
 }
 
 function createBabelOptions(rawOptions?: BabelOptions) {