From 9accca6649594a38018a0a63ecaceb0efe7648ab Mon Sep 17 00:00:00 2001
From: RAMAZAN HOYLADI <75537267+ramazanhoyladi@users.noreply.github.com>
Date: Thu, 24 Oct 2024 13:54:15 +0300
Subject: [PATCH] Turkish language support

Turkish language support added to slug function.
---
 src/operations.ts | 32 ++++++++++++++++----------------
 1 file changed, 16 insertions(+), 16 deletions(-)

diff --git a/src/operations.ts b/src/operations.ts
index c91aeb59..5ebab0ba 100644
--- a/src/operations.ts
+++ b/src/operations.ts
@@ -534,24 +534,24 @@ export function parseOp(exp: string): {
 }
 
 export function toSlug(str: unknown) {
-	if (typeof str !== 'string') {
-		return '';
-	}
+  if (typeof str !== 'string') {
+    return null;
+  }
 
-	let res = str.replace(/^\s+|\s+$/g, ''); // trim
-	res = res.toLowerCase();
+  let res = str.replace(/^\s+|\s+$/g, ''); // trim
+  res = res.toLowerCase();
 
-	// remove accents
-	const from = 'àáãảạăằắẳẵặâầấẩẫậèéẻẽẹêềếểễệđùúủũụưừứửữựòóỏõọôồốổỗộơờớởỡợìíỉĩịäëïîöüûñçýỳỹỵỷ';
-	const to = 'aaaaaaaaaaaaaaaaaeeeeeeeeeeeduuuuuuuuuuuoooooooooooooooooiiiiiaeiiouuncyyyyy';
-	for (let i = 0, l = from.length; i < l; i++) {
-		res = res.replace(new RegExp(from.charAt(i), 'g'), to.charAt(i));
-	}
+  // remove accents and convert Turkish characters to English counterparts
+  const from = 'àáãảạăằắẳẵặâầấẩẫậèéẻẽẹêềếểễệđùúủũụưừứửữựòóỏõọôồốổỗộơờớởỡợìíỉĩịäëïîöüûñçýỳỹỵỷşçğöüı';
+  const to = 'aaaaaaaaaaaaaaaaaeeeeeeeeeeeduuuuuuuuuuuoooooooooooooooooiiiiiaeiiouuncyyyyyscgoui';
+  for (let i = 0, l = from.length; i < l; i++) {
+    res = res.replace(new RegExp(from.charAt(i), 'g'), to.charAt(i));
+  }
 
-	res = res
-		.replace(/[^a-z0-9 -]/g, '') // remove invalid chars
-		.replace(/\s+/g, '-') // collapse whitespace and replace by -
-		.replace(/-+/g, '-'); // collapse dashes
+  res = res
+    .replace(/[^a-z0-9 -]/g, '') // remove invalid chars
+    .replace(/\s+/g, '-') // collapse whitespace and replace by -
+    .replace(/-+/g, '-'); // collapse dashes
 
-	return res;
+  return res;
 }