Function: firstNonEmpty()
firstNonEmpty(
value):string|null
Trim the first usable string out of value. Returns null when
value is undefined, null, an empty string, or an array whose
first string member is empty. Mirrors how Express / Node header
accessors expose single vs. repeated headers - the first
non-empty entry wins, everything else is ignored.
Parameters
Section titled “Parameters”unknown
Returns
Section titled “Returns”string | null