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public/bower_components/jquery-validation/src/additional/creditcard.js

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+// https://jqueryvalidation.org/creditcard-method/
+// based on https://en.wikipedia.org/wiki/Luhn_algorithm
+$.validator.addMethod( "creditcard", function( value, element ) {
+	if ( this.optional( element ) ) {
+		return "dependency-mismatch";
+	}
+
+	// Accept only spaces, digits and dashes
+	if ( /[^0-9 \-]+/.test( value ) ) {
+		return false;
+	}
+
+	var nCheck = 0,
+		nDigit = 0,
+		bEven = false,
+		n, cDigit;
+
+	value = value.replace( /\D/g, "" );
+
+	// Basing min and max length on
+	// https://dev.ean.com/general-info/valid-card-types/
+	if ( value.length < 13 || value.length > 19 ) {
+		return false;
+	}
+
+	for ( n = value.length - 1; n >= 0; n-- ) {
+		cDigit = value.charAt( n );
+		nDigit = parseInt( cDigit, 10 );
+		if ( bEven ) {
+			if ( ( nDigit *= 2 ) > 9 ) {
+				nDigit -= 9;
+			}
+		}
+
+		nCheck += nDigit;
+		bEven = !bEven;
+	}
+
+	return ( nCheck % 10 ) === 0;
+}, "Please enter a valid credit card number." );