From 5477199b6cc4164e5f9d8e2ced07918dc18b7acf Mon Sep 17 00:00:00 2001
From: Omar Aguinaga <omar@unumotors.com>
Date: Wed, 10 Oct 2018 16:57:07 +0200
Subject: [PATCH] Add is email

---
 package-lock.json     |  2 +-
 src/is/types.js       | 11 +++++++++++
 test/is/types.test.js | 12 ++++++++++++
 3 files changed, 24 insertions(+), 1 deletion(-)

diff --git a/package-lock.json b/package-lock.json
index f041fa1..81f3b4e 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,6 +1,6 @@
 {
     "name": "checkif.js",
-    "version": "0.0.1",
+    "version": "0.3.1",
     "lockfileVersion": 1,
     "requires": true,
     "dependencies": {
diff --git a/src/is/types.js b/src/is/types.js
index 8d117e2..44bc566 100644
--- a/src/is/types.js
+++ b/src/is/types.js
@@ -125,6 +125,16 @@ export function isWindowObject(value) {
     return value != null && typeof value === 'object' && 'setInterval' in value;
 }
 
+/**
+ * Returns whether a given value is an email
+ * @param {*} value the value to check
+ */
+export function isEmail(value) {
+    /* eslint-disable-next-line no-useless-escape */
+    const re = /^(([^<>()\[\]\\.,;:\s@"]+(\.[^<>()\[\]\\.,;:\s@"]+)*)|(".+"))@((\[[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\.[0-9]{1,3}\])|(([a-zA-Z\-0-9]+\.)+[a-zA-Z]{2,}))$/;
+    return re.test(String(value).toLowerCase());
+}
+
 export default {
     object: isObject,
     array: isArray,
@@ -142,4 +152,5 @@ export default {
     regexp: isRegexp,
     undefined: isUndefined,
     windowObject: isWindowObject,
+    email: isEmail,
 };
diff --git a/test/is/types.test.js b/test/is/types.test.js
index 4ad9100..d5b0bc2 100644
--- a/test/is/types.test.js
+++ b/test/is/types.test.js
@@ -197,3 +197,15 @@ describe('isWindowObject', () => {
     });
     testFalsyWithNullable(is.windowObject);
 });
+
+describe('isEmail', () => {
+    test('returns true', () => {
+        expect(is.email('very.common@example.com')).toBeTruthy();
+        expect(is.email('other.email-with-hyphen@example.com')).toBeTruthy();
+        expect(is.email('user.name+tag+sorting@example.com')).toBeTruthy();
+    });
+    test('returns false', () => {
+        expect(is.email('john..doe@example.com')).toBeFalsy();
+    });
+    testFalsyWithNullable(is.email);
+});