Work around jsdom not providing TextEncoder

package.json

@@ -122,7 +122,7 @@
     "vite-plugin-svgr": "^3.2.0"
   },
   "jest": {
-    "testEnvironment": "jsdom",
+    "testEnvironment": "./test/environment.ts",
     "testMatch": [
       "<rootDir>/test/**/*-test.[jt]s?(x)"
     ],

test/environment.ts

@@ -0,0 +1,18 @@
+import { TextEncoder } from "util";
+import JSDOMEnvironment_, {
+  TestEnvironment as TestEnvironment_,
+} from "jest-environment-jsdom";
+import { JestEnvironmentConfig, EnvironmentContext } from "@jest/environment";
+
+// This is a patched version of jsdom that adds TextEncoder, as a workaround for
+// https://github.com/jsdom/jsdom/issues/2524
+// Once that issue is resolved, this custom environment file can be deleted
+export default class JSDOMEnvironment extends JSDOMEnvironment_ {
+  constructor(config: JestEnvironmentConfig, context: EnvironmentContext) {
+    super(config, context);
+    this.global.TextEncoder ??= TextEncoder;
+  }
+}
+
+export const TestEnvironment =
+  TestEnvironment_ === JSDOMEnvironment_ ? JSDOMEnvironment : TestEnvironment_;