From f1448ee25365b3cc99208e9fcc0575586308bc81 Mon Sep 17 00:00:00 2001
From: Yehyoung Kang <keepyourhonor@gmail.com>
Date: Thu, 16 Jun 2022 21:35:31 +0900
Subject: [PATCH] fix(wasm): support decoding data URL in Node < v16

Node < v16 do not provide a global `atob()` function for decoding base64
strings, and must use `Buffer.from()` instead. Furthermore,
`Buffer.from(str, 'base64').toString()` is much faster than `atob()` in
Node. Thus, prefer to use `Buffer.from()` if possible.
---
 packages/vite/src/node/plugins/wasm.ts | 20 +++++++++++++++-----
 1 file changed, 15 insertions(+), 5 deletions(-)

diff --git a/packages/vite/src/node/plugins/wasm.ts b/packages/vite/src/node/plugins/wasm.ts
index 1f64434a5b9781..439a61abb16b3d 100644
--- a/packages/vite/src/node/plugins/wasm.ts
+++ b/packages/vite/src/node/plugins/wasm.ts
@@ -7,11 +7,21 @@ const wasmHelperId = '/__vite-wasm-helper'
 const wasmHelper = async (opts = {}, url: string) => {
   let result
   if (url.startsWith('data:')) {
-    // @ts-ignore
-    const binaryString = atob(url.replace(/^data:.*?base64,/, ''))
-    const bytes = new Uint8Array(binaryString.length)
-    for (let i = 0; i < binaryString.length; i++) {
-      bytes[i] = binaryString.charCodeAt(i)
+    const urlContent = url.replace(/^data:.*?base64,/, '')
+    let bytes
+    if (typeof Buffer === 'function' && typeof Buffer.from === 'function') {
+      bytes = Buffer.from(urlContent, 'base64')
+    } else if (typeof atob === 'function') {
+      // @ts-ignore
+      const binaryString = atob(urlContent)
+      bytes = new Uint8Array(binaryString.length)
+      for (let i = 0; i < binaryString.length; i++) {
+        bytes[i] = binaryString.charCodeAt(i)
+      }
+    } else {
+      throw new Error(
+        'Failed to decode base64-encoded data URL, Buffer and atob are not supported'
+      )
     }
     // @ts-ignore
     result = await WebAssembly.instantiate(bytes, opts)