Build: Switch from UglifyJS to SWC minify, make the minified file ES5 #2335
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More recent UglifyJS versions have started converting regular functions to arrow ones, making ES5 source file migrated to a ES2015+ minified one. We want to avoid that even in 1.14.x as long as we keep the source file in ES5.
Ref mishoo/UglifyJS#5967
Ref jquery/download.jqueryui.com#629