From fae217952c0888ef29234530e67616fe96322a5d Mon Sep 17 00:00:00 2001
From: Rogier Schouten <github@workingcode.ninja>
Date: Mon, 2 Jan 2017 17:55:48 +0100
Subject: [PATCH] v5.4.2

---
 doc/API.md       | 6 +++---
 doc/CHANGELOG.md | 5 +++++
 package.json     | 2 +-
 3 files changed, 9 insertions(+), 4 deletions(-)

diff --git a/doc/API.md b/doc/API.md
index 1a6300c..3e0ee3e 100644
--- a/doc/API.md
+++ b/doc/API.md
@@ -427,7 +427,7 @@ var africaDoualaDate = amsterdamDate.toZone("Africa/Douala");
 var error = naiveDate.toZone("Europe/Amsterdam"); // ERROR! THROWS
 
 // Other way around is ok
-var ok = amsterdamDate.toZone(null); // returns naive date
+var ok = amsterdamDate.toZone(undefined); // returns naive date
 
 // In-place time zone conversion
 var d = new tc.DateTime("2014-01-01T13:59:59.000 Europe/Amsterdam");
@@ -460,8 +460,8 @@ tc.DateTime.exists(2015, 3, 29, 3, 0, 0, 0, TimeZone.zone("Europe/Amsterdam"));
 
 // Pre-1970 dates: you can allow or disallow them with the last boolean parameter
 // as the IANA time zone database is not reliable prior to 1970
-tc.DateTime.exists(1969, 12, 31, 23, 59, 59, 999, null, false); // false
-tc.DateTime.exists(1969, 12, 31, 23, 59, 59, 999, null, true); // true
+tc.DateTime.exists(1969, 12, 31, 23, 59, 59, 999, undefined, false); // false
+tc.DateTime.exists(1969, 12, 31, 23, 59, 59, 999, undefined, true); // true
 tc.DateTime.exists(1969, 12, 31, 23, 59, 59, 999, TimeZone.zone("Europe/Amsterdam"), false); // false
 tc.DateTime.exists(1969, 12, 31, 23, 59, 59, 999, TimeZone.zone("Europe/Amsterdam"), true); // true
 
diff --git a/doc/CHANGELOG.md b/doc/CHANGELOG.md
index b5a070e..443686c 100644
--- a/doc/CHANGELOG.md
+++ b/doc/CHANGELOG.md
@@ -1,6 +1,11 @@
 
 # Changelog
 
+## 5.4.2 (2017-01-02)
+
+* Upgrade TypeScript to 2.1.4 and enable strict null checks and other compile-time checks
+* DateTime.zone() now returns undefined rather than null for an unaware date
+
 ## 5.4.1 (2016-11-14)
 
 * Bugfix in Duration#equalsExact(): identical durations of 1 day would not be seen as equal
diff --git a/package.json b/package.json
index 14a8ad1..80e4417 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "timezonecomplete",
-  "version": "5.4.1",
+  "version": "5.4.2",
   "description": "DateTime, TimeZone, Duration and Period library aimed at providing a consistent and complete date-time interface, away from the original JavaScript Date class.",
   "keywords": [
     "Date",