i365 / es6-check-public

ES6 check https://jstool.gitlab.io/es6-check/

ES6-check

Detect whether there is ES6 (ES2015) new syntax in the js code file.
It can also detect new syntax such as ES7, ES8, ES9, and ES10.

ES6-check online

The new syntaxes that support detection are: ES6(2015), ES7(2016), ES8(2017), ES9(2018), ES10(2019), ES11(2020), ES12(2021), ES13(2022), ES14(2023), or "latest"

based acorn.js.

If you need to convert ES6 to ES5 online, you can use ES6 to ES5.