test: add WeakRef TypeScript lib

Author: aminya

test/unit/socket-close-test.ts

@@ -1,5 +1,3 @@
-/// <reference lib="ESNext" />
-
 import * as zmq from "../../src"
 
 import {assert} from "chai"

test/unit/socket-send-receive-test.ts

@@ -1,5 +1,3 @@
-/// <reference lib="ESNext" />
-
 import * as zmq from "../../src"
 
 import {assert} from "chai"

tsconfig.json

@@ -5,7 +5,10 @@
     "target": "es2020",
     "declaration": true,
     "module": "commonjs",
-    "types": ["node", "mocha"],
+    "types": [
+      "node",
+      "mocha"
+    ],
     "strictPropertyInitialization": false, // TODO
     "strict": true,
     "strictNullChecks": true,
@@ -18,6 +21,10 @@
     "incremental": true,
     "sourceMap": true,
     "esModuleInterop": true,
-    "lib": ["ES2020", "dom"]
+    "lib": [
+      "ES2020",
+      // only used in tests
+      "ES2021.WeakRef"
+    ]
   }
 }