Polyfill seems to be needed for some unit tests...

package.json

@@ -106,6 +106,7 @@
     "sass": "^1.45.1",
     "serve": "^11.3.2",
     "start-server-and-test": "^1.11.0",
+    "text-encoding-polyfill": "^0.6.7",
     "typechain": "^5.0.0",
     "typescript": "^4.4.3",
     "web3-react-abstract-connector": "npm:@web3-react/abstract-connector@^6.0.7",

src/polyfills.ts

@@ -1,4 +1,5 @@
 import 'polyfill-object.fromentries'
+import 'text-encoding-polyfill'
 
 import flat from 'array.prototype.flat'
 import flatMap from 'array.prototype.flatmap'

yarn.lock

@@ -6938,7 +6938,7 @@
   dependencies:
     "@web3-react/abstract-connector" "^6.0.7"
     "@web3-react/types" "^6.0.7"
-    walletlink "^2.4.7"
+    walletlink "^2.2.6"
 
 "@webassemblyjs/[email protected]":
   version "1.9.0"
@@ -24405,6 +24405,11 @@ test-value@^2.1.0:
     array-back "^1.0.3"
     typical "^2.6.0"
 
+text-encoding-polyfill@^0.6.7:
+  version "0.6.7"
+  resolved "https://registry.yarnpkg.com/text-encoding-polyfill/-/text-encoding-polyfill-0.6.7.tgz#4d27de0153e4c86eb2631ffd74c2f3f57969a9ec"
+  integrity sha512-/DZ1XJqhbqRkCop6s9ZFu8JrFRwmVuHg4quIRm+ziFkR3N3ec6ck6yBvJ1GYeEQZhLVwRW0rZE+C3SSJpy0RTg==
+
 [email protected], text-table@^0.2.0:
   version "0.2.0"
   resolved "https://registry.yarnpkg.com/text-table/-/text-table-0.2.0.tgz#7f5ee823ae805207c00af2df4a84ec3fcfa570b4"