From 6f5c233f1d760d91ac3cf9dd12526730bb79dead Mon Sep 17 00:00:00 2001
From: SkyZeroZx <73321943+SkyZeroZx@users.noreply.github.com>
Date: Sat, 7 Feb 2026 15:14:38 -0500
Subject: [PATCH] refactor(common): extract argument assertion

Deduplicates string argument validation logic across pipes
by introducing a local assertion helper

(cherry picked from commit 66e8385b6ae1bc775b446ae992b90c44f6e78f8d)
---
 .../common/src/pipes/case_conversion_pipes.ts | 20 +++++++++----------
 1 file changed, 10 insertions(+), 10 deletions(-)

diff --git a/packages/common/src/pipes/case_conversion_pipes.ts b/packages/common/src/pipes/case_conversion_pipes.ts
index 02beaba7dc4..aa38f7add75 100644
--- a/packages/common/src/pipes/case_conversion_pipes.ts
+++ b/packages/common/src/pipes/case_conversion_pipes.ts
@@ -6,7 +6,7 @@
  * found in the LICENSE file at https://angular.dev/license
  */
 
-import {Pipe, PipeTransform} from '@angular/core';
+import {Pipe, PipeTransform, Type} from '@angular/core';
 
 import {invalidPipeArgumentError} from './invalid_pipe_argument_error';
 
@@ -39,9 +39,7 @@ export class LowerCasePipe implements PipeTransform {
   transform(value: string | null | undefined): string | null;
   transform(value: string | null | undefined): string | null {
     if (value == null) return null;
-    if (typeof value !== 'string') {
-      throw invalidPipeArgumentError(LowerCasePipe, value);
-    }
+    assertPipeArgument(LowerCasePipe, value);
     return value.toLowerCase();
   }
 }
@@ -89,9 +87,7 @@ export class TitleCasePipe implements PipeTransform {
   transform(value: string | null | undefined): string | null;
   transform(value: string | null | undefined): string | null {
     if (value == null) return null;
-    if (typeof value !== 'string') {
-      throw invalidPipeArgumentError(TitleCasePipe, value);
-    }
+    assertPipeArgument(TitleCasePipe, value);
 
     return value.replace(
       unicodeWordMatch,
@@ -121,9 +117,13 @@ export class UpperCasePipe implements PipeTransform {
   transform(value: string | null | undefined): string | null;
   transform(value: string | null | undefined): string | null {
     if (value == null) return null;
-    if (typeof value !== 'string') {
-      throw invalidPipeArgumentError(UpperCasePipe, value);
-    }
+    assertPipeArgument(UpperCasePipe, value);
     return value.toUpperCase();
   }
 }
+
+function assertPipeArgument(pipe: Type<any>, value: Object): void {
+  if (typeof value !== 'string') {
+    throw invalidPipeArgumentError(pipe, value);
+  }
+}