From dedd701b36ed7d88a71e89c0ddc2b0c2404f249d Mon Sep 17 00:00:00 2001
From: Itai Steinherz <itaisteinherz@gmail.com>
Date: Thu, 25 Oct 2018 00:35:35 +0300
Subject: [PATCH] Fix method signature

---
 source/index.ts      | 4 ++--
 source/tests/test.ts | 2 --
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/source/index.ts b/source/index.ts
index 47727a4..afdb3a1 100644
--- a/source/index.ts
+++ b/source/index.ts
@@ -136,8 +136,8 @@ namespace is { // tslint:disable-line:no-namespace
 	// tslint:enable:variable-name
 
 	export const nullOrUndefined = (value: any): value is null | undefined => null_(value) || undefined(value);
-	export const numericString = (value: any): value is String =>
-		!Number.isNaN(Number(value)) && !nullOrUndefined(value);
+	export const numericString = (value: string): bool =>
+		!Number.isNaN(Number(value));
 
 	export const array = Array.isArray;
 	export const buffer = isBuffer;
diff --git a/source/tests/test.ts b/source/tests/test.ts
index 1199430..e57cb69 100644
--- a/source/tests/test.ts
+++ b/source/tests/test.ts
@@ -430,8 +430,6 @@ test('is.numericString', t => {
 	t.true(m.numericString('5'));
 	t.true(m.numericString('-3.2'));
 	t.true(m.numericString('Infinity'));
-	t.false(m.numericString(undefined));
-	t.false(m.numericString(null));
 });
 
 test('is.array', t => {