Load deserializers lazily

spec/fixtures/packages/package-with-deserializers/deserializer-1.js

@@ -1,6 +1,6 @@
 module.exports = function (state) {
   return {
-    wasDeserializedBy: 'TheDeserializer',
+    wasDeserializedBy: 'Deserializer1',
     state: state
   }
 }

spec/fixtures/packages/package-with-deserializers/deserializer-2.js

@@ -0,0 +1,6 @@
+module.exports = function (state) {
+  return {
+    wasDeserializedBy: 'Deserializer2',
+    state: state
+  }
+}

spec/fixtures/packages/package-with-deserializers/package.json

@@ -2,6 +2,7 @@
   "name": "package-with-deserializers",
   "version": "1.0.0",
   "atom-deserializers": {
-    "TheDeserializerName": "./the-deserializer.js"
+    "Deserializer1": "./deserializer-1.js",
+    "Deserializer2": "./deserializer-2.js"
   }
 }

spec/package-manager-spec.coffee

@@ -82,11 +82,16 @@ describe "PackageManager", ->
     it "registers any deserializers specified in the package's package.json", ->
       atom.packages.loadPackage("package-with-deserializers")
 
-      state = {deserializer: 'TheDeserializerName', a: 'b'}
+      state1 = {deserializer: 'Deserializer1', a: 'b'}
+      expect(atom.deserializers.deserialize(state1)).toEqual {
+        wasDeserializedBy: 'Deserializer1'
+        state: state1
+      }
 
-      expect(atom.deserializers.deserialize(state)).toEqual {
-        wasDeserializedBy: 'TheDeserializer'
-        state: state
+      state2 = {deserializer: 'Deserializer2', c: 'd'}
+      expect(atom.deserializers.deserialize(state2)).toEqual {
+        wasDeserializedBy: 'Deserializer2'
+        state: state2
       }
 
   describe "::unloadPackage(name)", ->

src/package.coffee

@@ -256,8 +256,14 @@ class Package
 
   loadDeserializers: ->
     for name, implementationPath of @metadata['atom-deserializers']
-      deserialize = require(path.join(@path, implementationPath))
-      atom.deserializers.add({name, deserialize})
+      do =>
+        deserializePath = path.join(@path, implementationPath)
+        deserializeFunction = null
+        atom.deserializers.add
+          name: name,
+          deserialize: ->
+            deserializeFunction ?= require(deserializePath)
+            deserializeFunction.apply(this, arguments)
     return
 
   getStylesheetsPath: ->