From 86c4bb7f8c34003168ac5380a01401fcbeac4013 Mon Sep 17 00:00:00 2001
From: Vendicated <vendicated@riseup.net>
Date: Wed, 28 Sep 2022 22:49:46 +0200
Subject: [PATCH] Improve webpack performance (~ 80ms -> 15ms)

---
 src/utils/patchWebpack.ts | 25 ++++++++++++++++++++++---
 src/webpack/webpack.ts    |  8 +++++++-
 2 files changed, 29 insertions(+), 4 deletions(-)

diff --git a/src/utils/patchWebpack.ts b/src/utils/patchWebpack.ts
index ce29c82dd..050896827 100644
--- a/src/utils/patchWebpack.ts
+++ b/src/utils/patchWebpack.ts
@@ -53,6 +53,18 @@ function patchPush() {
                         return originalMod(module, exports, require);
                     }
 
+                    // There are (at the time of writing) 11 modules exporting the window
+                    // Make these non enumerable to improve webpack search performance
+                    if (module.exports === window) {
+                        Object.defineProperty(require.c, id, {
+                            value: require.c[id],
+                            enumerable: false,
+                            configurable: true,
+                            writable: true
+                        });
+                        return;
+                    }
+
                     for (const callback of listeners) {
                         try {
                             callback(exports);
@@ -65,10 +77,17 @@ function patchPush() {
                             if (filter(exports)) {
                                 subscriptions.delete(filter);
                                 callback(exports);
-                            } else for (const nested in exports) {
-                                if (exports[nested] && filter(exports[nested])) {
+                            } else if (typeof exports === "object") {
+                                if (exports.default && filter(exports.default)) {
                                     subscriptions.delete(filter);
-                                    callback(exports[nested]);
+                                    callback(exports.default);
+                                }
+
+                                for (const nested in exports) if (nested.length < 3) {
+                                    if (exports[nested] && filter(exports[nested])) {
+                                        subscriptions.delete(filter);
+                                        callback(exports[nested]);
+                                    }
                                 }
                             }
                         } catch (err) {
diff --git a/src/webpack/webpack.ts b/src/webpack/webpack.ts
index 64e2310cd..9e550a46d 100644
--- a/src/webpack/webpack.ts
+++ b/src/webpack/webpack.ts
@@ -44,9 +44,15 @@ export function find(filter: FilterFn, getDefault = true) {
 
         if (filter(mod.exports))
             return mod.exports;
+
+        if (typeof mod.exports !== "object") continue;
+
         if (mod.exports.default && filter(mod.exports.default))
             return getDefault ? mod.exports.default : mod.exports;
-        for (const nestedMod in mod.exports) {
+
+        // is 3 is the longest obfuscated export?
+        // the length check makes search about 20% faster
+        for (const nestedMod in mod.exports) if (nestedMod.length < 3) {
             const nested = mod.exports[nestedMod];
             if (nested && filter(nested)) return nested;
         }