feat: drop core-js and babel where possible

Now that the minimum version of Node that we support is 4,
we can stop shimming things everyhwere on the server side code.

gruntfile.js

@@ -31,7 +31,6 @@ module.exports = function (grunt) {
     },
     mochaTest: {
       options: {
-        require: 'babel-register',
         reporter: 'dot',
         ui: 'bdd',
         quiet: false,

lib/file-list.js

@@ -7,9 +7,6 @@
 // Dependencies
 // ------------
 
-var Map = require('core-js/library/fn/map')
-var Set = require('core-js/library/fn/set')
-var from = require('core-js/library/fn/array/from')
 var Promise = require('bluebird')
 var mm = require('minimatch')
 var Glob = require('glob').Glob
@@ -120,7 +117,7 @@ List.prototype._findFile = function (path, pattern) {
   if (!path || !pattern) return
   if (!this.buckets.has(pattern.pattern)) return
 
-  return _.find(from(this.buckets.get(pattern.pattern)), function (file) {
+  return _.find(Array.from(this.buckets.get(pattern.pattern)), function (file) {
     return file.originalPath === path
   })
 }
@@ -229,7 +226,7 @@ Object.defineProperty(List.prototype, 'files', {
     }
 
     var expandPattern = function (p) {
-      return from(self.buckets.get(p.pattern) || []).sort(byPath)
+      return Array.from(self.buckets.get(p.pattern) || []).sort(byPath)
     }
 
     var served = this._patterns.filter(function (pattern) {

lib/middleware/source_files.js

@@ -1,4 +1,3 @@
-var from = require('core-js/library/fn/array/from')
 var querystring = require('querystring')
 var _ = require('lodash')
 
@@ -8,7 +7,7 @@ var log = logger.create('middleware:source-files')
 
 // Files is a Set
 var findByPath = function (files, path) {
-  return _.find(from(files), function (file) {
+  return _.find(Array.from(files), function (file) {
     return file.path === path
   })
 }

lib/reporter.js

@@ -1,7 +1,6 @@
 var util = require('util')
 var resolve = require('url').resolve
 var SourceMapConsumer = require('source-map').SourceMapConsumer
-var WeakMap = require('core-js/es6/weak-map')
 var _ = require('lodash')
 
 var log = require('./logger').create('reporter')

package.json

@@ -358,8 +358,6 @@
   "devDependencies": {
     "LiveScript": "^1.3.0",
     "babel-core": "^6.26.0",
-    "babel-preset-env": "^1.6.1",
-    "babel-register": "^6.23.0",
     "chai": "^4.1.2",
     "chai-as-promised": "^7.1.1",
     "chai-subset": "^1.2.2",

test/unit/cli.spec.js

@@ -1,8 +1,10 @@
-import cli from '../../lib/cli'
-import optimist from 'optimist'
-import path from 'path'
-import constant from '../../lib/constants'
-import mocks from 'mocks'
+var optimist = require('optimist')
+var path = require('path')
+var mocks = require('mocks')
+
+var cli = require('../../lib/cli')
+var constant = require('../../lib/constants')
+
 var loadFile = mocks.loadFile
 
 describe('cli', () => {

test/unit/config.spec.js

@@ -1,4 +1,4 @@
-import path from 'path'
+var path = require('path')
 var loadFile = require('mocks').loadFile
 var helper = require('../../lib/helper')
 var logger = require('../../lib/logger.js')
@@ -421,7 +421,9 @@ describe('config', () => {
   describe('custom', () => {
     var di = require('di')
 
-    var forwardArgsFactory = (args) => args
+    var forwardArgsFactory = function (args) {
+      return args
+    }
 
     var baseModule = {
       'preprocessor:base': ['type', forwardArgsFactory],

test/unit/emitter_wrapper.spec.js

@@ -1,5 +1,6 @@
-import EmitterWrapper from '../../lib/emitter_wrapper'
-import {EventEmitter} from 'events'
+var EventEmitter = require('events').EventEmitter
+
+var EmitterWrapper = require('../../lib/emitter_wrapper')
 
 describe('emitter_wrapper', () => {
   var emitter

test/unit/file-list.spec.js

@@ -1,23 +1,24 @@
-import Promise from 'bluebird'
-import {EventEmitter} from 'events'
-import mocks from 'mocks'
-import proxyquire from 'proxyquire'
-import pathLib from 'path'
-import _ from 'lodash'
-import from from 'core-js/library/fn/array/from'
+var Promise = require('bluebird')
+var EventEmitter = require('events').EventEmitter
+var mocks = require('mocks')
+var proxyquire = require('proxyquire')
+var pathLib = require('path')
+var _ = require('lodash')
 
-import helper from '../../lib/helper'
-import config from '../../lib/config'
+var helper = require('../../lib/helper')
+var config = require('../../lib/config')
 
 // create an array of pattern objects from given strings
-var patterns = (...strings) => strings.map((str) => new config.Pattern(str))
+var patterns = function () {
+  return Array.from(arguments).map((str) => new config.Pattern(str))
+}
 
 function pathsFrom (files) {
-  return _.map(from(files), 'path')
+  return _.map(Array.from(files), 'path')
 }
 
 function findFile (path, files) {
-  return from(files).find((file) => file.path === path)
+  return Array.from(files).find((file) => file.path === path)
 }
 
 var PATTERN_LIST = {
@@ -71,10 +72,12 @@ describe('FileList', () => {
       emitter = new EventEmitter()
 
       glob = {
-        Glob: (pattern, opts) => ({
-          found: patternList[pattern],
-          statCache: mg.statCache
-        })
+        Glob: function (pattern, opts) {
+          return {
+            found: patternList[pattern],
+            statCache: mg.statCache
+          }
+        }
       }
 
       List = proxyquire('../../lib/file-list', {
@@ -201,10 +204,12 @@ describe('FileList', () => {
       emitter = new EventEmitter()
 
       glob = {
-        Glob: (pattern, opts) => ({
-          found: patternList[pattern],
-          statCache: mg.statCache
-        })
+        Glob: function (pattern, opts) {
+          return {
+            found: patternList[pattern],
+            statCache: mg.statCache
+          }
+        }
       }
 
       List = proxyquire('../../lib/file-list', {
@@ -238,10 +243,12 @@ describe('FileList', () => {
       emitter = new EventEmitter()
 
       glob = {
-        Glob: (pattern, opts) => ({
-          found: patternList[pattern],
-          statCache: mg.statCache
-        })
+        Glob: function (pattern, opts) {
+          return {
+            found: patternList[pattern],
+            statCache: mg.statCache
+          }
+        }
       }
 
       List = proxyquire('../../lib/file-list', {
@@ -430,10 +437,12 @@ describe('FileList', () => {
       emitter = new EventEmitter()
 
       glob = {
-        Glob: (pattern, opts) => ({
-          found: patternList[pattern],
-          statCache: mg.statCache
-        })
+        Glob: function (pattern, opts) {
+          return {
+            found: patternList[pattern],
+            statCache: mg.statCache
+          }
+        }
       }
 
       clock = sinon.useFakeTimers()
@@ -557,10 +566,12 @@ describe('FileList', () => {
       emitter = new EventEmitter()
 
       glob = {
-        Glob: (pattern, opts) => ({
-          found: patternList[pattern],
-          statCache: mg.statCache
-        })
+        Glob: function (pattern, opts) {
+          return {
+            found: patternList[pattern],
+            statCache: mg.statCache
+          }
+        }
       }
 
       clock = sinon.useFakeTimers()
@@ -664,10 +675,12 @@ describe('FileList', () => {
       emitter = new EventEmitter()
 
       glob = {
-        Glob: (pattern, opts) => ({
-          found: patternList[pattern],
-          statCache: mg.statCache
-        })
+        Glob: function (pattern, opts) {
+          return {
+            found: patternList[pattern],
+            statCache: mg.statCache
+          }
+        }
       }
 
       clock = sinon.useFakeTimers()
@@ -739,16 +752,18 @@ describe('FileList', () => {
     beforeEach(() => {
       patternList = PATTERN_LIST
       mg = MG
-      Promise.setScheduler((fn) => fn())
+      Promise.setScheduler(function (fn) { fn() })
 
       preprocess = sinon.spy((file, done) => process.nextTick(done))
       emitter = new EventEmitter()
 
       glob = {
-        Glob: (pattern, opts) => ({
-          found: patternList[pattern],
-          statCache: mg.statCache
-        })
+        Glob: function (pattern, opts) {
+          return {
+            found: patternList[pattern],
+            statCache: mg.statCache
+          }
+        }
       }
 
       modified = sinon.stub()

test/unit/helper.spec.js

@@ -1,4 +1,4 @@
-import path from 'path'
+var path = require('path')
 
 describe('helper', () => {
   var helper = require('../../lib/helper')

test/unit/init.spec.js

@@ -1,4 +1,5 @@
-import path from 'path'
+var path = require('path')
+
 describe('init', () => {
   var loadFile = require('mocks').loadFile
   var m = null

test/unit/init/formatters.spec.js

@@ -1,4 +1,5 @@
-import formatters from '../../../lib/init/formatters'
+var formatters = require('../../../lib/init/formatters')
+
 describe('init/formatters', () => {
   var formatter
 
@@ -8,7 +9,8 @@ describe('init/formatters', () => {
     })
 
     describe('formatAnswers', () => {
-      var createAnswers = function (ans = {}) {
+      var createAnswers = function (ans) {
+        ans = ans || {}
         ans.frameworks = ans.frameworks || []
         ans.files = ans.files || []
         ans.onlyServedFiles = ans.onlyServedFiles || []

test/unit/init/state_machine.spec.js

@@ -1,4 +1,4 @@
-import StateMachine from '../../../lib/init/state_machine'
+var StateMachine = require('../../../lib/init/state_machine')
 
 describe('init/StateMachine', () => {
   var done