fix: set up globalThis for jest tests if not defined

Issue on Jest jsdom/jsdom#2961
globalThis in Node.js nodejs/node#22835

Author: trivikr

jest.config.js

@@ -10,4 +10,5 @@ module.exports = {
   ],
   testPathIgnorePatterns: ["/node_modules/", "<rootDir>/clients/client-.*"],
   coveragePathIgnorePatterns: ["/node_modules/", "<rootDir>/clients/client-.*", "/__fixtures__/"],
+  setupFiles: ["<rootDir>/scripts/jest/setupGlobalThis.js"],
 };

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",

scripts/jest/setupGlobalThis.js

@@ -0,0 +1,11 @@
+// Remove this hack once `globalThis` issue is resolved or we drop testing Node.js 10.x
+// Issue on Jest https://github.com/jsdom/jsdom/issues/2961
+// PR which added globalThis in Node.js https://github.com/nodejs/node/pull/22835
+if (!global.globalThis) {
+  Object.defineProperty(global, "globalThis", {
+    value: global,
+    writable: true,
+    enumerable: false,
+    configurable: true,
+  });
+}