From 64b22c4806f0888f99081c322266d584d24fbed9 Mon Sep 17 00:00:00 2001
From: Tobias Koppers <tobias.koppers@googlemail.com>
Date: Thu, 5 Jul 2018 12:50:51 +0200
Subject: [PATCH] make the cache a WeakMap to not leak memory

fixes #6929
---
 lib/optimize/SplitChunksPlugin.js | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/lib/optimize/SplitChunksPlugin.js b/lib/optimize/SplitChunksPlugin.js
index d56e2699399..60293603bf8 100644
--- a/lib/optimize/SplitChunksPlugin.js
+++ b/lib/optimize/SplitChunksPlugin.js
@@ -135,7 +135,8 @@ module.exports = class SplitChunksPlugin {
 
 	static normalizeName({ name, automaticNameDelimiter }) {
 		if (name === true) {
-			const cache = new Map();
+			/** @type {WeakMap<Chunk[], Record<string, string>>} */
+			const cache = new WeakMap();
 			const fn = (module, chunks, cacheGroup) => {
 				let cacheEntry = cache.get(chunks);
 				if (cacheEntry === undefined) {