Numeral.js - add missing second optional argument to format method for rounding function

types/numeral/index.d.ts

@@ -35,6 +35,8 @@ interface NumeralJsFormat {
 
 type RegisterType = 'format' | 'locale';
 
+type RoundingFunction = (value: number) => number;
+
 // http://numeraljs.com/#use-it
 interface Numeral {
 	(value?: any): Numeral;
@@ -60,7 +62,7 @@ interface Numeral {
 	nullFormat(format: string): void;
 	defaultFormat(format: string): void;
 	clone(): Numeral;
-	format(inputString?: string): string;
+	format(inputString?: string, roundingFunction?: RoundingFunction): string;
 	formatCurrency(inputString?: string): string;
 	unformat(inputString: string): number;
 	value(): number;

types/numeral/numeral-tests.ts

@@ -6,6 +6,9 @@ var valueFormat: string = numeral(1000).format('0,0');
 var valueUnformat: number = numeral().unformat('($10,000.00)');
 // '-10000'
 
+var valueFormatFloor: string = numeral(1.357).format('0.00', Math.floor);
+// '1.35'
+
 var value3: Numeral = numeral(1000);
 var added: Numeral = value3.add(10);
 // 1010