From c025a63c8c592a1e1feef8de1fe32b7ab689802c Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Th=C3=A9o=20LUDWIG?= <contact@theoludwig.fr>
Date: Fri, 22 May 2026 10:33:08 +0200
Subject: [PATCH] =?UTF-8?q?perf:=20avoid=20O(n=C2=B2)=20array=20spread=20i?=
 =?UTF-8?q?n=20getEnumsMap=20accumulator?=
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Mutate the existing values array instead of spreading it on every row.
---
 src/index.ts | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/index.ts b/src/index.ts
index 0c850f1..24c9342 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -173,7 +173,12 @@ export class KyselyTypegenPostgresDialect extends KyselyTypegenDialect {
     const enums = new Map<string, string[]>()
     for (const row of rows) {
       const data = row as { enumName: string; enumValue: string }
-      enums.set(data.enumName, [...(enums.get(data.enumName) ?? []), data.enumValue])
+      const existing = enums.get(data.enumName)
+      if (existing == null) {
+        enums.set(data.enumName, [data.enumValue])
+      } else {
+        existing.push(data.enumValue)
+      }
     }
     return enums
   }