Still "Error [ERR_MODULE_NOT_FOUND]: Cannot find module" After adding "type":"module"

Question

I know this is require / import ES6 thing. I have a project using import and files are all .js, based on this all I need is adding "type":"module" into nearest package.json. This is my package.json at the same top level as server.js and env.js:

{
  "name": "my project",
  "version": "1.0.0",
  "description": "many .js",
  "main": "server.js",
  "type":"module",
  "directories": {
    "test": "test"
  },
"dependencies":{...},
"devDependencies":{...},
"scripts":{...},
"author":"John Doe"
}

server.js

import express from 'express';
import 'babel-polyfill';
import cors from 'cors';
import env from './env';

Still got

internal/process/esm_loader.js:74 internalBinding('errors').triggerUncaughtException( ^ Error [ERR_MODULE_NOT_FOUND]: Cannot find module 'c:\project\env' imported from c:\project\server.js did you mean to import../env.js?

node is 14.9.0, using nvm.

launch.json

{
 "version": "0.2.0",
    "configurations": [
        {
            "type": "node",
            "request": "launch",
            "name": "Launch Program",
            "skipFiles": [
                "<node_internals>/**"
            ],
            "program": "${workspaceFolder}\\server.js"
        }
    ]
}

Answer 1

From the docs of Node.js, "There is the ECMAScript module loader:", fifth point:

It does no extension searching. A file extension must be provided when the specifier is a relative or absolute file URL.

So you will need to change one line:

import express from 'express';
import 'babel-polyfill';
import cors from 'cors';
// import env from './env';
import env from './env.js';

as the error message already hint you:

[...] did you mean to import../env.js?

Answer 2

If you do "type":"module", then you can't import things like import env from './env'; You just need to do it as written below:

import env from './env.js';