From 6bfe8ecb259784281fee26e4e5fdf037eb884952 Mon Sep 17 00:00:00 2001
From: Holger Just <hello@holgerjust.de>
Date: Wed, 20 Dec 2017 21:28:12 +0100
Subject: [PATCH] Provide prepend alias for FilterChain@unshift

Ruby 2.5 introduces this alias for all arrays.
---
 lib/rackstash/filter_chain.rb       | 1 +
 spec/rackstash/filter_chain_spec.rb | 5 +++++
 2 files changed, 6 insertions(+)

diff --git a/lib/rackstash/filter_chain.rb b/lib/rackstash/filter_chain.rb
index 9ccb306..445e98c 100644
--- a/lib/rackstash/filter_chain.rb
+++ b/lib/rackstash/filter_chain.rb
@@ -251,6 +251,7 @@ module Rackstash
       end
       self
     end
+    alias prepend unshift
 
     # Returns an Array representation of the filter chain.
     #
diff --git a/spec/rackstash/filter_chain_spec.rb b/spec/rackstash/filter_chain_spec.rb
index 37ff0af..59114d2 100644
--- a/spec/rackstash/filter_chain_spec.rb
+++ b/spec/rackstash/filter_chain_spec.rb
@@ -455,6 +455,11 @@ describe Rackstash::FilterChain do
 
       expect { filter_chain.unshift }.to raise_error ArgumentError
     end
+
+    it 'can use #prepend alias' do
+      filter_chain.prepend filter
+      expect(filter_chain[0]).to eql filter
+    end
   end
 
   describe '#to_a' do