The following code:
if (!value || $.trim(value).length === 0)
return true;
Produces the following warning.
(JS) The signature '(str: string): string' of '$.trim' is deprecated.
The recommended fix says to use the native String.prototype.trim method instead.
But $.trim(value) is not equal to value.trim(). The first version works with types other than strings (null, undefined, Number). The second version requires a string.
Has it been documented why this jQuery.trim() is deprecated when there isn't a direct replacement? And does anyone have a good replacement for it?
The implementation of $.trim() is
trim: function( text ) {
return text == null ?
"" :
( text + "" ).replace( rtrim, "" );
},
This is roughly equivalent to String(text).trim(), but the conditional avoids converting null and undefined to the strings "null" and `"undefined". Trimming them returns an empty string.
A simple way to write this in modern JS would be
jQuery.trim = text => String(text ?? "").trim();
The jQuery code predates the ?? null coalescing operator.