From f4b47e70135900fb6341f0750a612c9b2844eb59 Mon Sep 17 00:00:00 2001
From: Henry Mercer <henrymercer@github.com>
Date: Fri, 23 Jan 2026 17:51:02 +0000
Subject: [PATCH] Add result type

---
 src/util.ts | 30 ++++++++++++++++++++++++++++++
 1 file changed, 30 insertions(+)

diff --git a/src/util.ts b/src/util.ts
index 327fce0c7..fc11b86b2 100644
--- a/src/util.ts
+++ b/src/util.ts
@@ -1292,3 +1292,33 @@ export function joinAtMost(
 
   return array.join(separator);
 }
+
+type Success<T> = Result<T, never>;
+type Failure<E> = Result<never, E>;
+
+export class Result<T, E> {
+  private constructor(
+    private readonly _ok: boolean,
+    public readonly value: T | E,
+  ) {}
+
+  static ok<T>(value: T): Success<T> {
+    return new Result(true, value) as Success<T>;
+  }
+
+  static error<E>(error: E): Failure<E> {
+    return new Result(false, error) as Failure<E>;
+  }
+
+  isOk(): this is Success<T> {
+    return this._ok;
+  }
+
+  isError(): this is Failure<E> {
+    return !this._ok;
+  }
+
+  orElse(defaultValue: T): T {
+    return this._ok ? (this.value as T) : defaultValue;
+  }
+}