add ts config settings suggested by typescript docs for babel & tsc combination

Author: clairep94

client/tsconfig.json

@@ -14,6 +14,13 @@
     "resolveJsonModule": true,
     "allowSyntheticDefaultImports": true,
     "forceConsistentCasingInFileNames": true,
+
+    // From https://www.typescriptlang.org/docs/handbook/babel-with-typescript.html to use Babel for transpiling, tsc for types
+    // Ensure that .d.ts files are created by tsc, but not .js files
+    "declaration": true,
+    "emitDeclarationOnly": true,
+    // Ensure that Babel can safely transpile files in the TypeScript project
+    "isolatedModules": true
   },
   "include": ["**/*"],
   "exclude": [