fix: dev cmd didn't watch files due to import mangling

Appearently the esModuleInterop flag in TypeScript is not compatible
with node-watch, and the import helper was mangling the import as a
result and causing an error in the dev command that resulted in files
not being watched.

This fixes that import issue and adds an e2e test to help prevent a
regression of this issue in the future.

test/run-tests.ts

@@ -10,7 +10,6 @@ import * as path from "path";
 import { shuffle } from "./lib/utils";
 
 const TEST_SUITES_DIR = path.join(__dirname, "test-suites");
-
 const files = fs.readdirSync(TEST_SUITES_DIR);
 // Shuffle test suites to detect ordering dependencies between them.
 shuffle(files);