Avoid serving legacy JavaScript to modern browsers error

7karimi

I am using betheme and when run site in page speed insight this error appears:

PageSpeed Insights.pdf

Avoid serving legacy JavaScript to modern browsers

https://developers.google.com/speed/pagespeed/insights/?url=https%3A%2F%2Fbarast.com%2F%25D9%25BE%25D8%25A7%25DB%258C%25D8%25A7%25D9%2586%25D9%2587-%25D8%25A8%25D8%25A7%25D8%25B1%25D8%25A8%25D8%25B1%25DB%258C-%25DA%25A9%25D8%25B1%25D8%25AC%2F&tab=mobile

Polyfills and transforms enable legacy browsers to use new JavaScript features. However, many aren't necessary for modern browsers. For your bundled JavaScript, adopt a modern script deployment strategy using module/nomodule feature detection to reduce the amount of code shipped to modern browsers, while retaining support for legacy browsers. Learn More

URL

Potential Savings

…js/plugins.js?ver=161…(barast.com)

5.1 KiB

…js/plugins.js?ver=161…:1:7833(barast.com)

Date.now

…js/plugins.js?ver=161…:2:106056(barast.com)

@babel/plugin-transform-classes

/%D9%BE%D8%A7%DB%8C%D8%A7%D9%86%D9%87-%D8%A8%D8%A7%D8%B1%D8%A8%…(barast.com)

0.2 KiB

/%D9%BE%D8%A7%DB%8C%D8%A7%D9%86%D9%87-%D8%A8%D8%A7%D8%B1%D8%A8%…:3:524(barast.com)

@babel/plugin-transform-classes

Phil

Hi,

We are aware of the stuff you mentioned, but we cannot really do much with it because we need to support older browsers as well, where this code is necessary.

We need to keep some features so our theme will be available through different browsers and their versions.

Thanks

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