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.

tsconfig-base.json

@@ -1,6 +1,5 @@
 {
     "compilerOptions": {
-        "esModuleInterop": true,
         "module": "CommonJS",
         "moduleResolution": "node",
         "target": "ES2018",