doesn't work on IE11

[sinchang]

seems the compiled code doesn't work on IE 11.

[sinchang]

compilerOptions target: ES2015

compilerOptions target: ES5

so quick solution is change the target to ES5

Ref: https://www.meziantou.net/which-version-of-ecmascript-should-i-use-in-the-typescript-configuration.htm#select-your-target-j

[otakustay]

Yes, we have target set to ES2015 by design to produce minimum code size and to be compatible with ES modules.

We will discuss this in our team, I don't have a good expectation to change it to ES5, for now I'd recommended you to process these packages via babel