From 6bbf1dfb0f019f5f68b13952614cb78fe73d314e Mon Sep 17 00:00:00 2001
From: Gorbachev Egor <7gorbachevm@gmail.com>
Date: Sun, 9 Jan 2022 11:53:50 +0300
Subject: [PATCH] Use TS assertion signature to avoid type casting

---
 src/index.ts | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/index.ts b/src/index.ts
index e2487eb..7918214 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -1,4 +1,4 @@
-const assert = (condition: boolean, message: string) => {
+function assert(condition: boolean, message: string): asserts condition {
   if (!condition) {
     throw new Error(message);
   }
@@ -76,7 +76,7 @@ export class StructType implements IField {
     }
 
     assert(nextPart instanceof StructType, `Item in path "${head}" is not a Struct`);
-    return (nextPart as StructType).getDeep<T>(tail.join('.'));
+    return nextPart.getDeep<T>(tail.join('.'));
   }
 
   getDeepOffset(path: string, startOffset = 0): number {
@@ -91,7 +91,7 @@ export class StructType implements IField {
     }
 
     assert(nextPart instanceof StructType, `Item in path "${head}" is not a Struct`);
-    return (nextPart as StructType).getDeepOffset(tail.join('.'), nextOffset);
+    return nextPart.getDeepOffset(tail.join('.'), nextOffset);
   }
 
   getOffset(name: string) {