Sort translations after filtering them out.

Close #691.

lib/i18n-js.rb

@@ -13,6 +13,7 @@
 require_relative "i18n-js/schema"
 require_relative "i18n-js/version"
 require_relative "i18n-js/plugin"
+require_relative "i18n-js/sort_hash"
 
 module I18nJS
   MissingConfigError = Class.new(StandardError)
@@ -51,6 +52,7 @@ def self.export_group(group)
         end
       end
 
+    filtered_translations = sort_hash(filtered_translations)
     output_file_path = File.expand_path(group[:file])
     exported_files = []
 

lib/i18n-js/sort_hash.rb

@@ -0,0 +1,12 @@
+# frozen_string_literal: true
+
+module I18nJS
+  def self.sort_hash(hash)
+    return hash unless hash.is_a?(Hash)
+
+    hash.keys.sort_by(&:to_s).each_with_object({}) do |key, seed|
+      value = hash[key]
+      seed[key] = value.is_a?(Hash) ? sort_hash(value) : value
+    end
+  end
+end

test/i18n-js/sort_hash_test.rb

@@ -0,0 +1,21 @@
+# frozen_string_literal: true
+
+require "test_helper"
+
+class SortHashTest < Minitest::Test
+  test "returns non-hash objects" do
+    assert_equal 1, I18nJS.sort_hash(1)
+  end
+
+  test "sorts shallow hash" do
+    expected = {a: 1, b: 2, c: 3}
+
+    assert_equal expected, I18nJS.sort_hash(c: 3, a: 1, b: 2)
+  end
+
+  test "sorts nested hash" do
+    expected = {a: {b: 1, c: 2}, d: 3}
+
+    assert_equal expected, I18nJS.sort_hash(d: 3, a: {c: 2, b: 1})
+  end
+end