Support esbuild --keep-names to prevent class/function names erasing

[inca]

As stated in evanw/esbuild#931, evanw/esbuild#510 and elsewhere, sometimes it is undesirable to have class names erased.

Current behaviour of esm.sh seems to be erasing the class/function names, e.g. export class Price { ... } would be transpiled into var t = class {}; export { t as Price } which makes mahPrice.constructor.name return "t" instead of "Price".

Esbuild supports --keep-names which solves this problem; however, there is currently no way of enabling it with esm.sh.

[inca]

Thank you! You folks are the best ❤️

[ije]

thanks for suggestion