diff --git a/yargs/index.d.ts b/yargs/index.d.ts
index 8f6f7cf531..238f5d1edd 100644
--- a/yargs/index.d.ts
+++ b/yargs/index.d.ts
@@ -1,6 +1,6 @@
-// Type definitions for yargs
+// Type definitions for yargs 6.3.0
 // Project: https://github.com/chevex/yargs
-// Definitions by: Martin Poelstra <https://github.com/poelstra>, Mizunashi Mana <https://github.com/mizunashi-mana>
+// Definitions by: Martin Poelstra <https://github.com/poelstra>, Mizunashi Mana <https://github.com/mizunashi-mana>, Jeffery Grajkowski <https://github.com/pushplay>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 
 declare namespace yargs {
@@ -18,12 +18,6 @@ declare namespace yargs {
 
         terminalWidth(): number;
 
-			terminalWidth(): number;
-
-			terminalWidth(): number;
-
-			terminalWidth(): number;
-
         alias(shortName: string, longName: string): Argv;
         alias(aliases: { [shortName: string]: string }): Argv;
         alias(aliases: { [shortName: string]: string[] }): Argv;
@@ -31,8 +25,8 @@ declare namespace yargs {
         array(key: string): Argv;
         array(keys: string[]): Argv;
 
-        default(key: string, value: any): Argv;
-        default(defaults: { [key: string]: any }): Argv;
+        default(key: string, value: any, description?: string): Argv;
+        default(defaults: { [key: string]: any }, description?: string): Argv;
 
         demand(key: string, msg: string): Argv;
         demand(key: string, required?: boolean): Argv;
@@ -79,6 +73,7 @@ declare namespace yargs {
 
         commandDir(dir: string, opts?: RequireDirectoryOptions): Argv;
 
+        completion(): Argv;
         completion(cmd: string, fn?: AsyncCompletionFunction): Argv;
         completion(cmd: string, fn?: SyncCompletionFunction): Argv;
         completion(cmd: string, description?: string, fn?: AsyncCompletionFunction): Argv;
@@ -94,18 +89,27 @@ declare namespace yargs {
         string(key: string): Argv;
         string(keys: string[]): Argv;
 
+        number(key: string): Argv;
+        number(keys: string[]): Argv;
+
         choices(choices: Object): Argv;
         choices(key: string, values: any[]): Argv;
 
-        config(key: string): Argv;
-        config(keys: string[]): Argv;
+        config(): Argv;
+        config(explicitConfigurationObject: Object): Argv;
+        config(key: string, description?: string, parseFn?: (configPath: string) => Object): Argv;
+        config(keys: string[], description?: string, parseFn?: (configPath: string) => Object): Argv;
+        config(key: string, parseFn: (configPath: string) => Object): Argv;
+        config(keys: string[], parseFn: (configPath: string) => Object): Argv;
 
         wrap(columns: number): Argv;
 
         strict(): Argv;
 
         help(): Argv;
-        help(option: string, description?: string): Argv;
+        help(enableExplicit: boolean): Argv;
+        help(option: string, enableExplicit: boolean): Argv;
+        help(option: string, description?: string, enableExplicit?: boolean): Argv;
 
         env(prefix?: string): Argv;
         env(enable: boolean): Argv;
@@ -118,7 +122,7 @@ declare namespace yargs {
 
         showHelpOnFail(enable: boolean, message?: string): Argv;
 
-        showHelp(func?: (message: string) => any): Argv;
+        showHelp(consoleLevel?: string): Argv;
 
         exitProcess(enabled: boolean): Argv;
 
@@ -140,10 +144,26 @@ declare namespace yargs {
         count(key: string): Argv;
         count(keys: string[]): Argv;
 
-			fail(func: (msg: string, err: Error) => any): Argv;
+		fail(func: (msg: string, err: Error) => any): Argv;
 
         coerce<T, U>(key: string|string[], func: (arg: T) => U): Argv;
         coerce<T, U>(opts: { [key: string]: (arg: T) => U; }): Argv;
+
+        getCompletion(args: string[], done: (completions: string[]) => void): Argv;
+
+        pkgConf(key: string, cwd?: string): Argv;
+        pkgConf(keys: string[], cwd?: string): Argv;
+
+        recommendCommands(): Argv;
+
+        showCompletionScript(): Argv;
+
+        skipValidation(key: string): Argv;
+        skipValidation(keys: string[]): Argv;
+
+        updateLocale(obj: Object): Argv;
+
+        updateStrings(obj: {[key: string]: string}): Argv;
     }
 
     interface RequireDirectoryOptions {
diff --git a/yargs/yargs-tests.ts b/yargs/yargs-tests.ts
index 02bcf0695d..011d305621 100644
--- a/yargs/yargs-tests.ts
+++ b/yargs/yargs-tests.ts
@@ -411,3 +411,92 @@ function Argv$count() {
 		.count(['w', 'h'])
 		.argv
 }
+
+function Argv$number() {
+	var ya = yargs
+		.number('n')
+		.number(['width', 'height'])
+		.argv
+}
+
+function Argv$updateStrings() {
+	var ya = yargs
+		.command('run', 'the run command')
+		.help('help')
+		.updateStrings({
+			'Commands:': 'My Commands -->\n'
+		})
+		.wrap(null)
+		.argv
+}
+
+function Argv$default() {
+	var ya = yargs
+		.default('random', function randomValue() {
+			return Math.random() * 256;
+		})
+		.argv
+}
+
+function Argv$configObject() {
+	var ya = yargs
+		.config({foo: 1, bar: 2})
+		.argv
+}
+
+function Argv$configParseFunction() {
+	var ya = yargs
+		.config('settings', function (configPath) {
+			return JSON.parse(fs.readFileSync(configPath, 'utf-8'))
+		})
+		.config('settings', 'description', function (configPath) {
+			return JSON.parse(fs.readFileSync(configPath, 'utf-8'))
+		})
+		.argv
+}
+
+function Argv$helpDescriptionExplicit() {
+	var ya = yargs
+		.help('help', 'description', true)
+		.argv
+}
+
+function Argv$showHelpConsoleLevel() {
+	yargs.showHelp("log"); //prints to stdout using console.log()
+}
+
+function Argv$getCompletion() {
+	var ya = yargs
+		.option('foobar', {})
+		.option('foobaz', {})
+		.completion()
+		.getCompletion(['./test.js', '--foo'], function (completions) {
+			console.log(completions)
+		})
+		.argv
+}
+
+function Argv$pkgConf() {
+	var ya = yargs
+		.pkgConf(['key1', 'key2'], 'configFile.json')
+		.argv
+}
+
+function Argv$recommendCommands() {
+	var ya = yargs
+		.recommendCommands()
+		.argv
+}
+
+function Argv$showCompletionScript() {
+	var ya = yargs
+		.showCompletionScript()
+		.argv
+}
+
+function Argv$skipValidation() {
+	var ya = yargs
+		.skipValidation('arg1')
+		.skipValidation(['arg2', 'arg3'])
+		.argv
+}