Production bundle for ES format is not enough for a development

[danielkcz]

Current Behavior

Webpack will use ES format but being in a development mode it means the wrong assumption from 3rd modules like invariant which then throws an error.

https://github.com/zertosh/invariant/blob/fae1c859f3eec25025dc6019bf7f7fdb78a27307/invariant.js#L26

Expected behavior

Same behavior as for CJS should be used and provide development bundle along with index.es.js.

Suggested solution(s)

Should be pretty straightforward to add a line in here...

https://github.com/palmerhq/tsdx/blob/943648edb06cd131f2c1751120cd1301804b480b/src/index.ts#L98

And utilize logic for creating index file...

https://github.com/palmerhq/tsdx/blob/943648edb06cd131f2c1751120cd1301804b480b/src/index.ts#L277

Your environment

Software	Version(s)
TSDX	0.6.1
TypeScript	3.5.1
Browser	N/A
Yarn	1.16.0
Operating System	Windows x64

[TrySound]

I agree. ESM bundle should have NODE_ENV untouched.

[jaredpalmer]

Can you send a PR? I am out of office today. Should be straight forward

[danielkcz]

Working on it :)