diff --git a/types/bunyan-config/index.d.ts b/types/bunyan-config/index.d.ts
index 0ff84fd9d2..ebcddcd50d 100644
--- a/types/bunyan-config/index.d.ts
+++ b/types/bunyan-config/index.d.ts
@@ -2,6 +2,7 @@
 // Project: https://github.com/LSEducation/bunyan-config
 // Definitions by: Cyril Schumacher <https://github.com/cyrilschumacher>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.1
 
 /// <reference types="bunyan"/>
 
diff --git a/types/bunyan-logentries/index.d.ts b/types/bunyan-logentries/index.d.ts
index 9a2a5c3fb9..33057d768b 100644
--- a/types/bunyan-logentries/index.d.ts
+++ b/types/bunyan-logentries/index.d.ts
@@ -2,6 +2,7 @@
 // Project: https://github.com/nemtsov/node-bunyan-logentries
 // Definitions by: Aymeric Beaumet <http://aymericbeaumet.me>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.1
 
 /// <reference types="node" />
 
diff --git a/types/bunyan/bunyan-tests.ts b/types/bunyan/bunyan-tests.ts
index 657a59c3a8..d4c4f61e1c 100644
--- a/types/bunyan/bunyan-tests.ts
+++ b/types/bunyan/bunyan-tests.ts
@@ -129,3 +129,8 @@ class MyLogger extends Logger {
         super(options);
     }
 }
+
+const logLevelString: Logger.LogLevelString = 'warn';
+const nameLevel: number = Logger.levelFromName[logLevelString];
+const nameLevel2: number = Logger.levelFromName['warn'];
+const levelName: string = Logger.nameFromLevel[10];
diff --git a/types/bunyan/index.d.ts b/types/bunyan/index.d.ts
index bc1dca298d..a59790ebc9 100644
--- a/types/bunyan/index.d.ts
+++ b/types/bunyan/index.d.ts
@@ -2,6 +2,7 @@
 // Project: https://github.com/trentm/node-bunyan
 // Definitions by: Alex Mikhalev <https://github.com/amikhalev>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.1
 
 /// <reference types="node" />
 
@@ -210,7 +211,11 @@ declare namespace Logger {
     const ERROR: number;
     const FATAL: number;
 
-    type LogLevel = 'trace' | 'debug' | 'info' | 'warn' | 'error' | 'fatal' | number;
+    type LogLevelString = 'trace' | 'debug' | 'info' | 'warn' | 'error' | 'fatal';
+    type LogLevel = LogLevelString | number;
+
+    const levelFromName: { [name in LogLevelString]: number };
+    const nameFromLevel: { [level: number]: string };
 
     const stdSerializers: StdSerializers;
 
diff --git a/types/easy-api-request/index.d.ts b/types/easy-api-request/index.d.ts
index f04b68be3a..1b3606ccb1 100644
--- a/types/easy-api-request/index.d.ts
+++ b/types/easy-api-request/index.d.ts
@@ -2,6 +2,7 @@
 // Project: https://github.com/DeadAlready/easy-api-request
 // Definitions by: Karl Düüna <https://github.com/DeadAlready/>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
+// TypeScript Version: 2.1
 
 /// <reference types="node" />
 
diff --git a/types/easy-xapi-utils/index.d.ts b/types/easy-xapi-utils/index.d.ts
index a4e5f568e6..a4b219bf43 100644
--- a/types/easy-xapi-utils/index.d.ts
+++ b/types/easy-xapi-utils/index.d.ts
@@ -2,7 +2,7 @@
 // Project: https://github.com/DeadAlready/easy-xapi-utils
 // Definitions by: Karl Düüna <https://github.com/DeadAlready/>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-
+// TypeScript Version: 2.1
 
 /// <reference types="easy-jsend" />
 /// <reference types="easy-x-headers" />
diff --git a/types/easy-xapi/index.d.ts b/types/easy-xapi/index.d.ts
index f4a9e09391..aa4c0286cf 100644
--- a/types/easy-xapi/index.d.ts
+++ b/types/easy-xapi/index.d.ts
@@ -2,7 +2,7 @@
 // Project: https://github.com/DeadAlready/easy-xapi
 // Definitions by: Karl Düüna <https://github.com/DeadAlready/>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
-
+// TypeScript Version: 2.1
 
 /// <reference types="easy-jsend" />
 /// <reference types="bunyan" />