From 929bcf50ee634d9fe73adbe2aae5f7038b048e5a Mon Sep 17 00:00:00 2001
From: Evan You <yyx990803@gmail.com>
Date: Wed, 15 Sep 2021 21:46:28 -0400
Subject: [PATCH] fix: ensure stable pages entry order across builds

---
 src/node/config.ts | 26 ++++++++++++++++++++++----
 1 file changed, 22 insertions(+), 4 deletions(-)

diff --git a/src/node/config.ts b/src/node/config.ts
index a367ac6..32b58f8 100644
--- a/src/node/config.ts
+++ b/src/node/config.ts
@@ -16,6 +16,7 @@ import {
 } from './shared'
 import { resolveAliases, APP_PATH, DEFAULT_THEME_PATH } from './alias'
 import { MarkdownOptions } from './markdown/markdown'
+import { createHash } from 'crypto'
 
 export { resolveSiteDataByRoute } from './shared'
 
@@ -87,15 +88,32 @@ export async function resolveConfig(
     ? userThemeDir
     : DEFAULT_THEME_PATH
 
+  // Important: globby/fast-glob doesn't guarantee order of the returned files.
+  // We must sort the pages so the input list to rollup is stable across
+  // builds - otherwise different input order could result in different exports
+  // order in shared chunks which in turns invalidates the hash of every chunk!
+  // JavaScript built-in sort() is mandated to be stable as of ES2019 and
+  // supported in Node 12+, which is required by Vite.
+  const pages = (
+    await globby(['**.md'], {
+      cwd: srcDir,
+      ignore: ['**/node_modules', ...(userConfig.srcExclude || [])]
+    })
+  ).sort()
+
+  const hash = createHash('sha256')
+    .update(pages.join(','))
+    .digest('hex')
+    .slice(0, 8)
+
+  console.log(hash)
+
   const config: SiteConfig = {
     root,
     srcDir,
     site,
     themeDir,
-    pages: await globby(['**.md'], {
-      cwd: srcDir,
-      ignore: ['**/node_modules', ...(userConfig.srcExclude || [])]
-    }),
+    pages,
     configPath: resolve(root, 'config.js'),
     outDir: resolve(root, 'dist'),
     tempDir: path.resolve(APP_PATH, 'temp'),