docs: mention strict typescript usage (#3171)

docs/guide/usage.md

@@ -94,15 +94,17 @@ It is highly recommended to use version tags when importing libraries in Deno, e
 
 ## TypeScript Support
 
-Faker supports TypeScript out of the box, so you don't have to install any extra packages.
+We assume that you use TypeScript (strict mode).
+You can use Faker without it, but we don't have dedicated error messages for wrong parameter types.
 
 In order to have Faker working properly, you need to check if these `compilerOptions` are set correctly in your `tsconfig` file:
 
 ```json
 {
   "compilerOptions": {
     "esModuleInterop": true,
-    "moduleResolution": "Bundler" // "Node10", "Node16" or "NodeNext"
+    "moduleResolution": "Bundler", // "Node10", "Node16" or "NodeNext"
+    "strict": true // Optional, but recommended
   }
 }
 ```