Allow import of built-in browser modules, i.e. std:kv-storage

[andria-dev]

Should built-in browser modules be supported?

As it currently stands, CRA does not support built-in, standard library, browser modules and I haven't been able to find any information or discussion on future support for these modules (i.e. std:kv-storage).

If built-in modules are to ever be supported it would make sense to use polyfills as fallbacks. CRA could handle polyfilling those modules itself or allow developers to provide a mapping of built-in module names to fallbacks (i.e. a URL or a module in node_modules/).

Is this a bug report?

Yes

Environment

Browser: Chrome v74 (you'll need this to import std:kv-storage)
Dev Environment: Codesandbox but the problem is everywhere
CRA version: 3.0.0

Steps to Reproduce

0. Enable experimental web platform features on Chrome
   chrome://flags/#enable-experimental-web-platform-features
1. Create a new project with CRA
2. Attempt to import storage from std:kv-storage inside any js file (I used /src/index.js) like so:

import { storage } from 'std:kv-storage';

3. Try to console.log the imported storage variable.

console.log(storage);

Expected Behavior

I expected the build to succeed by being able to identify that this import was referencing a built-in module because it was prefixed with std:, and, therefore, not attempt to find and bundle a module called std:kv-storage from /node_modules/.

Since it didn't build the application, this part never happened but I expected the console.log(storage) log the following to the console:

StorageArea {}

Actual Behavior

The build fails with the error:

Module not found: Can't resolve 'std:kv-storage'

Reproducible Demo

CRA unsuccessful build repro:
https://codesandbox.io/s/4lw89q0l14?fontsize=14

Static example of importing std:kv-storage:
https://codesandbox.io/s/7m87rjjk90?fontsize=14