chore: now bn accepts null (#523)

Author: LuizAsFight

.changeset/brown-teachers-hide.md

@@ -0,0 +1,5 @@
+---
+"@fuel-ts/math": patch
+---
+
+now `bn` accepts `null`

packages/math/src/bn.test.ts

@@ -281,14 +281,16 @@ describe('Math - BN', () => {
     expect(() => bn(over).toHex(4)).toThrow();
   });
 
-  it('should create bn with number or undefined', () => {
-    const inputs: { numb: number; str: string; undef?: string } = {
+  it('should create bn with number or undefined or null', () => {
+    const inputs: { numb: number; str: string; undef?: string; nil: null } = {
       numb: 2,
       str: '5',
+      nil: null,
     };
 
     expect(bn().toNumber()).toEqual(0);
     expect(bn(inputs?.undef).toNumber()).toEqual(0);
+    expect(bn(inputs?.nil).toNumber()).toEqual(0);
     expect(bn(inputs?.numb).toNumber()).toEqual(2);
     expect(bn(inputs?.str).toNumber()).toEqual(5);
   });

packages/math/src/bn.ts

@@ -41,7 +41,7 @@ interface BNHiddenTypes {
 type BNInputOverridesKeys = keyof BNInputOverrides;
 
 export class BN extends BnJs implements BNInputOverrides, BNHiddenTypes, BNHelper, BNOverrides {
-  constructor(value?: BNInput, base?: number | 'hex', endian?: BnJs.Endianness) {
+  constructor(value?: BNInput | null, base?: number | 'hex', endian?: BnJs.Endianness) {
     if (BN.isBN(value)) {
       super(value.toArray(), base, endian);
       return;
@@ -251,7 +251,7 @@ export class BN extends BnJs implements BNInputOverrides, BNHiddenTypes, BNHelpe
 }
 
 // functional shortcut to create BN
-export const bn = (value?: BNInput, base?: number | 'hex', endian?: BnJs.Endianness) =>
+export const bn = (value?: BNInput | null, base?: number | 'hex', endian?: BnJs.Endianness) =>
   new BN(value, base, endian);
 
 bn.parseUnits = (value: string, units: number = DECIMAL_UNITS): BN => {