fix: Enable strict TypeScript settings

src/ldp/operations/SimplePostOperationHandler.ts

@@ -26,6 +26,9 @@ export class SimplePostOperationHandler extends OperationHandler {
   }
 
   public async handle(input: Operation): Promise<ResponseDescription> {
+    if (!input.body) {
+      throw new UnsupportedHttpError('POST operations require a body.');
+    }
     const identifier = await this.store.addResource(input.target, input.body);
     return { identifier };
   }