From d33ce96d185b3d7ca613ac2c6f233a95f3b8c93b Mon Sep 17 00:00:00 2001
From: Sebastian Seedorf <mail@sebse.de>
Date: Tue, 26 May 2020 20:35:54 +0200
Subject: [PATCH] NaN option

---
 validators/number.test.ts |  4 ++++
 validators/number.ts      | 10 ++++++++--
 2 files changed, 12 insertions(+), 2 deletions(-)

diff --git a/validators/number.test.ts b/validators/number.test.ts
index d198946..3b21fef 100644
--- a/validators/number.test.ts
+++ b/validators/number.test.ts
@@ -19,6 +19,7 @@ Deno.test("isNumber (match)", async () => {
   for (const value of values) {
     assertEquals(await validate(value, isNumber()), []);
   }
+  assertEquals(await validate(NaN, isNumber({ allowNaN: true })), []);
 });
 
 Deno.test("isNumber (no match)", async () => {
@@ -35,6 +36,7 @@ Deno.test("isNumber (no match)", async () => {
   for (const value of values) {
     assertNotEquals(await validate(value, isNumber()), []);
   }
+  assertNotEquals(await validate(NaN, isNumber({ allowNaN: false })), []);
 });
 
 Deno.test("isInteger (match)", async () => {
@@ -49,6 +51,7 @@ Deno.test("isInteger (match)", async () => {
   for (const value of values) {
     assertEquals(await validate(value, isInteger()), []);
   }
+  assertEquals(await validate(NaN, isInteger({ allowNaN: true })), []);
 });
 
 Deno.test("isInteger (no match)", async () => {
@@ -66,4 +69,5 @@ Deno.test("isInteger (no match)", async () => {
   for (const value of values) {
     assertNotEquals(await validate(value, isInteger()), []);
   }
+  assertNotEquals(await validate(NaN, isInteger({ allowNaN: false })), []);
 });
diff --git a/validators/number.ts b/validators/number.ts
index cc192d0..45c570e 100644
--- a/validators/number.ts
+++ b/validators/number.ts
@@ -1,10 +1,13 @@
 import { Validator, Args } from "../mod.ts";
 
-export function isNumber(): Validator {
+export function isNumber(
+  { allowNaN = false }: { allowNaN?: boolean } = {},
+): Validator {
   return {
     type: "isNumber",
     check: (value: any) => {
       if (value === null || value === undefined) return;
+      if (allowNaN && Number.isNaN(value)) return;
       if (!Number.isFinite(value)) {
         return {};
       }
@@ -15,11 +18,14 @@ export function isNumber(): Validator {
   };
 }
 
-export function isInteger(): Validator {
+export function isInteger(
+  { allowNaN = false }: { allowNaN?: boolean } = {},
+): Validator {
   return {
     type: "isInteger",
     check: (value: any) => {
       if (value === null || value === undefined) return;
+      if (allowNaN && Number.isNaN(value)) return;
       if (!Number.isInteger(value)) {
         return {};
       }