From 26cc99b92d63540bbd7792415a9f82a1e9936106 Mon Sep 17 00:00:00 2001
From: Anders Hejlsberg <andersh@microsoft.com>
Date: Sun, 14 Feb 2016 18:41:38 -0800
Subject: [PATCH] Introduce -strictNullChecks compiler option

---
 src/compiler/commandLineParser.ts    | 5 +++++
 src/compiler/diagnosticMessages.json | 4 ++++
 src/compiler/types.ts                | 1 +
 3 files changed, 10 insertions(+)

diff --git a/src/compiler/commandLineParser.ts b/src/compiler/commandLineParser.ts
index 86d073f7d49..bdc586b6037 100644
--- a/src/compiler/commandLineParser.ts
+++ b/src/compiler/commandLineParser.ts
@@ -326,6 +326,11 @@ namespace ts {
             name: "noImplicitUseStrict",
             type: "boolean",
             description: Diagnostics.Do_not_emit_use_strict_directives_in_module_output
+        },
+        {
+            name: "strictNullChecks",
+            type: "boolean",
+            description: Diagnostics.Enable_strict_null_checks
         }
     ];
 
diff --git a/src/compiler/diagnosticMessages.json b/src/compiler/diagnosticMessages.json
index 25b86e67d34..6978a9ad611 100644
--- a/src/compiler/diagnosticMessages.json
+++ b/src/compiler/diagnosticMessages.json
@@ -2576,6 +2576,10 @@
         "category": "Message",
         "code": 6112
     },
+    "Enable strict null checks.": {
+        "category": "Message",
+        "code": 6113
+    },
 
     "Variable '{0}' implicitly has an '{1}' type.": {
         "category": "Error",
diff --git a/src/compiler/types.ts b/src/compiler/types.ts
index 6b9f49cac01..3e59a623c2f 100644
--- a/src/compiler/types.ts
+++ b/src/compiler/types.ts
@@ -2420,6 +2420,7 @@ namespace ts {
         allowSyntheticDefaultImports?: boolean;
         allowJs?: boolean;
         noImplicitUseStrict?: boolean;
+        strictNullChecks?: boolean;
         /* @internal */ stripInternal?: boolean;
 
         // Skip checking lib.d.ts to help speed up tests.