Ability to use native-loader esm

[sionzee]

Is your feature request related to a problem? Please describe.
At issue #1511 you have mentioned the vite is not using native-loader and would be great to use once it is stable.
I was using type: module since Vite 2.0.0.beta.1 even in Vite 1.x.x.beta and everything was working fine.

The issues came in at Vite 2.0.0.beta.22 so I'm stuck to Vite 2.0.0.beta.21.
Seems the current loader has an issue to parse even a RegExp. (I also know the transform fix for Import.meta is not proper)

For example try to parse this regex in vite.config.ts when you have type as module.

const test = /([\w_]+)\sas\s([\w_]+),?/g

You will get:

SyntaxError: Invalid regular expression: missing /
    at Loader.moduleStrategy (internal/modules/esm/translators.js:145:18)
    at processTicksAndRejections (internal/process/task_queues.js:93:5)
    at async link (internal/modules/esm/module_job.js:47:21)

And that is because of the question mark at the end. (the regex is fully valid and is working in beta.21)

Vite version: vite/2.0.0-beta.29 linux-x64 node-v14.15.4
System: WSL

Describe the solution you'd like
As you mentioned in the issue #1511 I would like to have ability to use native-loaders which will resolve the two issues above (even when the one is temporary fixed) and next upcoming esm issues.

[yyx990803]

Can you provide a reproduction? This probably is fixable by base64 encoding the inline module.