Auto-generated commit

Author: stdlib-bot

.github/.keepalive

@@ -16,6 +16,7 @@ Joey Reed <joeyrreed@gmail.com>
 Jordan-Gallivan <115050475+Jordan-Gallivan@users.noreply.github.com>
 Joris Labie <joris.labie1@gmail.com>
 Justin Dennison <justin1dennison@gmail.com>
+KATTA NAGA NITHIN <88046362+nithinkatta@users.noreply.github.com>
 Marcus <mfantham@users.noreply.github.com>
 Matt Cochrane <matthew.cochrane.eng@gmail.com>
 Milan Raj <rajsite@users.noreply.github.com>

CONTRIBUTORS

@@ -36,7 +36,7 @@ interface IsString {
 	* var bool = isString( 'beep' );
 	* // returns true
 	*/
-	( value: any ): boolean;
+	( value: any ): value is string | String;
 
 	/**
 	* Tests if a value is a string primitive.
@@ -52,7 +52,7 @@ interface IsString {
 	* var bool = isString.isPrimitive( new String( 'beep' ) );
 	* // returns false
 	*/
-	isPrimitive( value: any ): boolean;
+	isPrimitive( value: any ): value is string;
 
 	/**
 	* Tests if a value is a string object.
@@ -68,7 +68,7 @@ interface IsString {
 	* var bool = isString.isObject( 'beep' );
 	* // returns false
 	*/
-	isObject( value: any ): boolean;
+	isObject( value: any ): value is String;
 }
 
 /**