Report deprecations in tasks

src/task-bootstrap.coffee

@@ -41,6 +41,14 @@ handleEvents = ->
     result = handler.bind({async})(args...)
     emit('task:completed', result) unless isAsync
 
+setupDeprecations = ->
+  Grim = require 'grim'
+  Grim.on 'updated', ->
+    deprecations = Grim.getDeprecations().map (deprecation) -> deprecation.serialize()
+    emit('task:deprecations', deprecations)
+    Grim.clearDeprecations()
+
 setupGlobals()
 handleEvents()
+setupDeprecations()
 handler = require(taskPath)

src/task.coffee

@@ -1,6 +1,7 @@
 _ = require 'underscore-plus'
 {fork} = require 'child_process'
 {Emitter} = require 'emissary'
+Grim = require 'grim'
 
 # Extended: Run a node script in a separate process.
 #
@@ -87,6 +88,9 @@ class Task
     @on "task:log", -> console.log(arguments...)
     @on "task:warn", -> console.warn(arguments...)
     @on "task:error", -> console.error(arguments...)
+    @on "task:deprecations", (deprecations) ->
+      Grim.addSerializedDeprecation(deprecation) for deprecation in deprecations
+      return
     @on "task:completed", (args...) => @callback?(args...)
 
     @handleEvents()