From 5f2806a104027e8310770f2ca8e4c350064c2c5a Mon Sep 17 00:00:00 2001
From: "Artem S. Povalyukhin" <artem.povaluhin@gmail.com>
Date: Sat, 27 Jun 2020 19:26:41 +0300
Subject: [PATCH] Fixed TypeScript description for NjsByteString type.

NjsByteString was declared as it has no relation to string primitive type.
This causes a problem when a variable of type NjsByteString is passed into
built-in functions expecting string type.

The issue was introduced in 8f3ef384f69e.
---
 src/ts/njs_core.d.ts | 10 +++++-----
 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/ts/njs_core.d.ts b/src/ts/njs_core.d.ts
index a632d1fd..9abcee52 100644
--- a/src/ts/njs_core.d.ts
+++ b/src/ts/njs_core.d.ts
@@ -14,14 +14,14 @@ interface String {
      * Serializes a Unicode string with code points up to 255
      * into a byte string, otherwise, null is returned.
      */
-    toBytes(start?: number, end?: number): NjsByteString;
+    toBytes(start?: number, end?: number): NjsByteString | null;
     /**
      * Serializes a Unicode string to a byte string using UTF8 encoding.
      */
     toUTF8(start?: number, end?: number): NjsByteString;
 }
 
-interface NjsByteString extends String {
+type NjsByteString = string & {
     /**
      * Returns a new Unicode string from a byte string where each byte is replaced
      * with a corresponding Unicode code point.
@@ -31,12 +31,12 @@ interface NjsByteString extends String {
      * Converts a byte string containing a valid UTF8 string into a Unicode string,
      * otherwise null is returned.
      */
-    fromUTF8(start?: number, end?: number): string;
+    fromUTF8(start?: number, end?: number): string | null;
     /**
      * Encodes a byte string to hex, base64, or base64url.
      */
-    toString(encoding?: "hex" | "base64" | "base64url"): string;
-}
+    toString(encoding: "hex" | "base64" | "base64url"): string;
+};
 
 type NjsStringLike = string | NjsByteString;
 
-- 
2.47.3