From 7aa2dbc4049164a242d52e386e0294c8847d2206 Mon Sep 17 00:00:00 2001
From: "Kamat, Trivikram" <16024985+trivikr@users.noreply.github.com>
Date: Tue, 5 Oct 2021 04:50:45 +0000
Subject: [PATCH] fix: patch Jest memory leak by calling GC afterEach

Refs: https://github.com/facebook/jest/issues/7311#issuecomment-578889493
---
 jest.config.js                | 1 +
 package.json                  | 2 +-
 scripts/jest/forceGlobalGc.js | 3 +++
 3 files changed, 5 insertions(+), 1 deletion(-)
 create mode 100644 scripts/jest/forceGlobalGc.js

diff --git a/jest.config.js b/jest.config.js
index a94b37b7c9fdb..043a5c2f14aa9 100644
--- a/jest.config.js
+++ b/jest.config.js
@@ -10,4 +10,5 @@ module.exports = {
   ],
   testPathIgnorePatterns: ["/node_modules/", "<rootDir>/clients/client-.*"],
   coveragePathIgnorePatterns: ["/node_modules/", "<rootDir>/clients/client-.*", "/__fixtures__/"],
+  setupFilesAfterEnv: ["<rootDir>/scripts/jest/forceGlobalGc.js"],
 };
diff --git a/package.json b/package.json
index d5f1a9bf3da3a..56aeb047d48b1 100644
--- a/package.json
+++ b/package.json
@@ -19,7 +19,7 @@
     "build:all": "yarn build:crypto-dependencies && lerna run build",
     "build-documentation": "yarn remove-documentation && typedoc",
     "pretest:all": "yarn build:all",
-    "test:all": "jest --coverage --passWithNoTests && lerna run test --scope '@aws-sdk/{fetch-http-handler,hash-blob-browser}'",
+    "test:all": "node --expose-gc ./node_modules/.bin/jest --coverage --passWithNoTests && lerna run test --scope '@aws-sdk/{fetch-http-handler,hash-blob-browser}'",
     "test:functional": "jest --config tests/functional/jest.config.js --passWithNoTests",
     "test:integration-legacy": "cucumber-js --fail-fast",
     "test:integration": "jest --config jest.config.integ.js --passWithNoTests",
diff --git a/scripts/jest/forceGlobalGc.js b/scripts/jest/forceGlobalGc.js
new file mode 100644
index 0000000000000..3467479df0dc8
--- /dev/null
+++ b/scripts/jest/forceGlobalGc.js
@@ -0,0 +1,3 @@
+afterEach(() => {
+  if (global.gc) global.gc();
+});