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According to the document of String.prototype.trim() on mdn, trim() not only deals with
\s
but also\s\uFEFF\xA0
. This is the better polyfill of trim().Notice on the newest page of String.prototype.trim(), the polyfill part is removed because it was so outdated. The last browser that needs polyfill was WebView Android 37, which was released 7 years ago. See mdn/content#7602
Also I know axios why keeps a polyfill version of trim()(See this) and also know about #3980 , but it can be done better.