From 5b6d3f38421f0a39f405a5acb895430b3cd58df5 Mon Sep 17 00:00:00 2001
From: Eric Rabil <ericjrabil@gmail.com>
Date: Fri, 10 Sep 2021 20:25:08 -0400
Subject: [PATCH] Invalidate publisher promise on first fire

---
 Sources/Pwomise/Extensions/Publisher+Promise.swift | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/Sources/Pwomise/Extensions/Publisher+Promise.swift b/Sources/Pwomise/Extensions/Publisher+Promise.swift
index efea494..e38db50 100644
--- a/Sources/Pwomise/Extensions/Publisher+Promise.swift
+++ b/Sources/Pwomise/Extensions/Publisher+Promise.swift
@@ -18,16 +18,22 @@ public extension Publisher {
     var promise: Promise<Output> {
         let promise = Promise<Output>()
         
-        sink(receiveCompletion: {
+        var cancellable: AnyCancellable?
+        
+        cancellable = sink(receiveCompletion: {
             switch $0 {
             case .failure(let err):
                 promise.result = .resolved(.failure(err))
+                cancellable?.cancel()
+                cancellable = nil
             default:
                 break
             }
         }, receiveValue: { value in
             promise.result = .resolved(.success(value))
-        }).store(in: &cancellables)
+            cancellable?.cancel()
+            cancellable = nil
+        })
         
         return promise
     }