Dev Server crashes after creating project about gen-express-app

[mlewand]

I faced this issue today as well. It appears that ESM modules are not loaded properly for the distribution version as if you run node --experimental-specifier-resolution=node .express/www.js manually, you'll get something like:
 

% npm start

> [email protected] start
> node app.js

node:internal/modules/run_main:129
    triggerUncaughtException(
    ^

Error [ERR_MODULE_NOT_FOUND]: Cannot find module '/homedir/esm-test/foo/bar' imported from /homedir/esm-test/app.js
Did you mean to import "./foo/bar.js"?
    at finalizeResolution (node:internal/modules/esm/resolve:265:11)
    at moduleResolve (node:internal/modules/esm/resolve:933:10)
    at defaultResolve (node:internal/modules/esm/resolve:1169:11)
    at ModuleLoader.defaultResolve (node:internal/modules/esm/loader:383:12)
    at ModuleLoader.resolve (node:internal/modules/esm/loader:352:25)
    at ModuleLoader.getModuleJob (node:internal/modules/esm/loader:227:38)
    at ModuleWrap.<anonymous> (node:internal/modules/esm/module_job:87:39)
    at link (node:internal/modules/esm/module_job:86:36) {
  code: 'ERR_MODULE_NOT_FOUND',
  url: 'file:///homedir/esm-test/foo/bar'
}

Node.js v20.16.0

And it's caused by import usersRouter from "./routers/users"; line in generated dist/app.js.

If you repalce it with import usersRouter from "./routers/users.js"; it works fine.

[mlewand]

Based on discussion in microsoft/TypeScript#52412 you can make a quick and drity workaround by:

1. Setting following properties in compilerOptions of your tsconfig.json (you might need to overwrite some):

    "module": "Node16",

    "moduleResolution": "Node16",

1. Changing import usersRouter from "./routers/users"; to import usersRouter from "./routers/users.js"; in your src/app.ts.

After that it should compile and work - but that's a workaround.

[the-az-dev]

This package is under developing right now. I`ll try to remake this package in general and make huge patch with new functions, commands and bug fixes. Main goal - make simillar to @nestjs/cli package for ExpressJS developers.