Why is the current code default to ES6 and above? Why is it not converted to ES5?

[VyaWave]

Why is the current code default to ES6 and above?
Why is it not converted to ES5?

When I upgraded to the latest version, I found that the code is not ES5, and it caused me serious problems in IE11.

[sindresorhus]

Duplicate of #135

[sindresorhus]

https://github.com/sindresorhus/query-string/releases/tag/v6.0.0

[VyaWave]

oh.., also thank you for letting me know.