Move `utils` files to `@uppy/utils` package.

And rewrite all the require calls.

```bash
git mv src/utils/* packages/@uppy/utils/src
sed -i 's/[./]*\/utils\//@uppy\/utils\/lib\//' src/**/*.js # transform (../)*utils → @uppy/utils
```

packages/@uppy/utils/package.json

@@ -18,5 +18,7 @@
     "type": "git",
     "url": "git+https://github.com/transloadit/uppy.git"
   },
-  "dependencies": {}
+  "dependencies": {
+    "lodash.throttle": "^4.1.1"
+  }
 }

src/core/Core.js

@@ -5,11 +5,11 @@ const cuid = require('cuid')
 const prettyBytes = require('prettier-bytes')
 const match = require('mime-match')
 const DefaultStore = require('../store/DefaultStore')
-const getFileType = require('../utils/getFileType')
-const getFileNameAndExtension = require('../utils/getFileNameAndExtension')
-const generateFileID = require('../utils/generateFileID')
-const isObjectURL = require('../utils/isObjectURL')
-const getTimeStamp = require('../utils/getTimeStamp')
+const getFileType = require('@uppy/utils/lib/getFileType')
+const getFileNameAndExtension = require('@uppy/utils/lib/getFileNameAndExtension')
+const generateFileID = require('@uppy/utils/lib/generateFileID')
+const isObjectURL = require('@uppy/utils/lib/isObjectURL')
+const getTimeStamp = require('@uppy/utils/lib/getTimeStamp')
 
 /**
  * Uppy Core module.

src/core/Core.test.js

@@ -11,7 +11,7 @@ const InvalidPluginWithoutType = require('../../test/mocks/invalidPluginWithoutT
 jest.mock('cuid', () => {
   return () => 'cjd09qwxb000dlql4tp4doz8h'
 })
-jest.mock('../utils/findDOMElement', () => {
+jest.mock('@uppy/utils/lib/findDOMElement', () => {
   return () => null
 })
 

src/core/Plugin.js

@@ -1,5 +1,5 @@
 const preact = require('preact')
-const findDOMElement = require('../utils/findDOMElement')
+const findDOMElement = require('@uppy/utils/lib/findDOMElement')
 
 /**
  * Defer a frequent call to the microtask queue.

src/plugins/AwsS3/Multipart.js

@@ -1,9 +1,9 @@
 const Plugin = require('../../core/Plugin')
 const RequestClient = require('../../server/RequestClient')
 const UppySocket = require('../../core/UppySocket')
-const emitSocketProgress = require('../../utils/emitSocketProgress')
-const getSocketHost = require('../../utils/getSocketHost')
-const limitPromises = require('../../utils/limitPromises')
+const emitSocketProgress = require('@uppy/utils/lib/emitSocketProgress')
+const getSocketHost = require('@uppy/utils/lib/getSocketHost')
+const limitPromises = require('@uppy/utils/lib/limitPromises')
 const Uploader = require('./MultipartUploader')
 
 /**

src/plugins/AwsS3/index.js

@@ -1,7 +1,7 @@
 const resolveUrl = require('resolve-url')
 const Plugin = require('../../core/Plugin')
 const Translator = require('../../core/Translator')
-const limitPromises = require('../../utils/limitPromises')
+const limitPromises = require('@uppy/utils/lib/limitPromises')
 const XHRUpload = require('../XHRUpload')
 
 function isXml (xhr) {

src/plugins/Dashboard/Dashboard.js

@@ -2,7 +2,7 @@ const FileList = require('./FileList')
 const Tabs = require('./Tabs')
 const FileCard = require('./FileCard')
 const classNames = require('classnames')
-const isTouchDevice = require('../../utils/isTouchDevice')
+const isTouchDevice = require('@uppy/utils/lib/isTouchDevice')
 const { h } = require('preact')
 
 // http://dev.edenspiekermann.com/2016/02/11/introducing-accessible-modal-dialog

src/plugins/Dashboard/FileItem.js

@@ -1,6 +1,6 @@
-const getFileNameAndExtension = require('../../utils/getFileNameAndExtension')
-const truncateString = require('../../utils/truncateString')
-const copyToClipboard = require('../../utils/copyToClipboard')
+const getFileNameAndExtension = require('@uppy/utils/lib/getFileNameAndExtension')
+const truncateString = require('@uppy/utils/lib/truncateString')
+const copyToClipboard = require('@uppy/utils/lib/copyToClipboard')
 const prettyBytes = require('prettier-bytes')
 const FileItemProgress = require('./FileItemProgress')
 const getFileTypeIcon = require('./getFileTypeIcon')

src/plugins/Dashboard/index.js

@@ -5,8 +5,8 @@ const DashboardUI = require('./Dashboard')
 const StatusBar = require('../StatusBar')
 const Informer = require('../Informer')
 const ThumbnailGenerator = require('../ThumbnailGenerator')
-const findAllDOMElements = require('../../utils/findAllDOMElements')
-const toArray = require('../../utils/toArray')
+const findAllDOMElements = require('@uppy/utils/lib/findAllDOMElements')
+const toArray = require('@uppy/utils/lib/toArray')
 const prettyBytes = require('prettier-bytes')
 const { defaultTabIcon } = require('./icons')
 

src/plugins/DragDrop/index.js

@@ -1,6 +1,6 @@
 const Plugin = require('../../core/Plugin')
 const Translator = require('../../core/Translator')
-const toArray = require('../../utils/toArray')
+const toArray = require('@uppy/utils/lib/toArray')
 const dragDrop = require('drag-drop')
 const { h } = require('preact')
 

src/plugins/FileInput.js

@@ -1,5 +1,5 @@
 const Plugin = require('../core/Plugin')
-const toArray = require('../utils/toArray')
+const toArray = require('@uppy/utils/lib/toArray')
 const Translator = require('../core/Translator')
 const { h } = require('preact')
 

src/plugins/Form.js

@@ -1,5 +1,5 @@
 const Plugin = require('../core/Plugin')
-const findDOMElement = require('../utils/findDOMElement')
+const findDOMElement = require('@uppy/utils/lib/findDOMElement')
 // Rollup uses get-form-data's ES modules build, and rollup-plugin-commonjs automatically resolves `.default`.
 // So, if we are being built using rollup, this require() won't have a `.default` property.
 const getFormData = require('get-form-data').default || require('get-form-data')

src/plugins/StatusBar/index.js

@@ -2,9 +2,9 @@ const Plugin = require('../../core/Plugin')
 const Translator = require('../../core/Translator')
 const StatusBarUI = require('./StatusBar')
 const statusBarStates = require('./StatusBarStates')
-const getSpeed = require('../../utils/getSpeed')
-const getBytesRemaining = require('../../utils/getBytesRemaining')
-const prettyETA = require('../../utils/prettyETA')
+const getSpeed = require('@uppy/utils/lib/getSpeed')
+const getBytesRemaining = require('@uppy/utils/lib/getBytesRemaining')
+const prettyETA = require('@uppy/utils/lib/prettyETA')
 const prettyBytes = require('prettier-bytes')
 
 /**

src/plugins/ThumbnailGenerator/index.js

@@ -1,6 +1,6 @@
 const Plugin = require('../../core/Plugin')
-const dataURItoBlob = require('../../utils/dataURItoBlob')
-const isPreviewSupported = require('../../utils/isPreviewSupported')
+const dataURItoBlob = require('@uppy/utils/lib/dataURItoBlob')
+const isPreviewSupported = require('@uppy/utils/lib/isPreviewSupported')
 
 /**
  * The Thumbnail Generator plugin

src/plugins/Tus.js

@@ -2,10 +2,10 @@ const Plugin = require('../core/Plugin')
 const tus = require('tus-js-client')
 const UppySocket = require('../core/UppySocket')
 const { Provider, RequestClient } = require('../server')
-const emitSocketProgress = require('../utils/emitSocketProgress')
-const getSocketHost = require('../utils/getSocketHost')
-const settle = require('../utils/settle')
-const limitPromises = require('../utils/limitPromises')
+const emitSocketProgress = require('@uppy/utils/lib/emitSocketProgress')
+const getSocketHost = require('@uppy/utils/lib/getSocketHost')
+const settle = require('@uppy/utils/lib/settle')
+const limitPromises = require('@uppy/utils/lib/limitPromises')
 require('whatwg-fetch')
 
 // Extracted from https://github.com/tus/tus-js-client/blob/master/lib/upload.js#L13

src/plugins/Url/index.js

@@ -3,7 +3,7 @@ const Translator = require('../../core/Translator')
 const { h } = require('preact')
 const { RequestClient } = require('../../server')
 const UrlUI = require('./UrlUI.js')
-const toArray = require('../../utils/toArray')
+const toArray = require('@uppy/utils/lib/toArray')
 
 /**
  * Url

src/plugins/Webcam/index.js

@@ -1,8 +1,8 @@
 const { h } = require('preact')
 const Plugin = require('../../core/Plugin')
 const Translator = require('../../core/Translator')
-const getFileTypeExtension = require('../../utils/getFileTypeExtension')
-const canvasToBlob = require('../../utils/canvasToBlob')
+const getFileTypeExtension = require('@uppy/utils/lib/getFileTypeExtension')
+const canvasToBlob = require('@uppy/utils/lib/canvasToBlob')
 const supportsMediaRecorder = require('./supportsMediaRecorder')
 const CameraIcon = require('./CameraIcon')
 const CameraScreen = require('./CameraScreen')

src/plugins/XHRUpload.js

@@ -3,10 +3,10 @@ const cuid = require('cuid')
 const Translator = require('../core/Translator')
 const UppySocket = require('../core/UppySocket')
 const Provider = require('../server/Provider')
-const emitSocketProgress = require('../utils/emitSocketProgress')
-const getSocketHost = require('../utils/getSocketHost')
-const settle = require('../utils/settle')
-const limitPromises = require('../utils/limitPromises')
+const emitSocketProgress = require('@uppy/utils/lib/emitSocketProgress')
+const getSocketHost = require('@uppy/utils/lib/getSocketHost')
+const settle = require('@uppy/utils/lib/settle')
+const limitPromises = require('@uppy/utils/lib/limitPromises')
 
 function buildResponseError (xhr, error) {
   // No error message

src/views/ProviderView/index.js

@@ -2,9 +2,9 @@ const { h, Component } = require('preact')
 const AuthView = require('./AuthView')
 const Browser = require('./Browser')
 const LoaderView = require('./Loader')
-const generateFileID = require('../../utils/generateFileID')
-const getFileType = require('../../utils/getFileType')
-const isPreviewSupported = require('../../utils/isPreviewSupported')
+const generateFileID = require('@uppy/utils/lib/generateFileID')
+const getFileType = require('@uppy/utils/lib/getFileType')
+const isPreviewSupported = require('@uppy/utils/lib/isPreviewSupported')
 
 /**
  * Array.prototype.findIndex ponyfill for old browsers.