--- /dev/null
+'use strict'
+
+module.exports = whitespace
+
+var fromCode = String.fromCharCode
+var re = /\s/
+
+// Check if the given character code, or the character code at the first
+// character, is a whitespace character.
+function whitespace(character) {
+ return re.test(
+ typeof character === 'number' ? fromCode(character) : character.charAt(0)
+ )
+}