Add tsconfig.json for browser_test

Author: hoodmane

Platforms/emscripten/browser_test/tsconfig.json

@@ -0,0 +1,12 @@
+{
+  "compilerOptions": {
+    "target": "esnext",
+    "module": "nodenext",
+    "lib": ["ES2020"],
+    "strict": true,
+    "esModuleInterop": true,
+    "types": ["node"]
+  },
+  "include": ["**/*.ts"],
+  "exclude": ["node_modules"]
+}