Switch most requires to imports (#6935)

src/controllers/controller.bar.js

@@ -1,11 +1,11 @@
 'use strict';
 
-var DatasetController = require('../core/core.datasetController');
-var defaults = require('../core/core.defaults');
-var elements = require('../elements/index');
-var helpers = require('../helpers/index');
+import DatasetController from '../core/core.datasetController';
+import defaults from '../core/core.defaults';
+import elements from '../elements';
+import helpers from '../helpers';
 
-var valueOrDefault = helpers.valueOrDefault;
+const valueOrDefault = helpers.valueOrDefault;
 
 defaults._set('bar', {
 	hover: {
@@ -184,7 +184,7 @@ function isFloatBar(custom) {
 	return custom && custom.barStart !== undefined && custom.barEnd !== undefined;
 }
 
-module.exports = DatasetController.extend({
+export default DatasetController.extend({
 
 	dataElementType: elements.Rectangle,
 

src/controllers/controller.bubble.js

@@ -1,9 +1,9 @@
 'use strict';
 
-const DatasetController = require('../core/core.datasetController');
-const defaults = require('../core/core.defaults');
-const elements = require('../elements/index');
-const helpers = require('../helpers/index');
+import DatasetController from '../core/core.datasetController';
+import defaults from '../core/core.defaults';
+import elements from '../elements';
+import helpers from '../helpers';
 
 const resolve = helpers.options.resolve;
 
@@ -34,7 +34,7 @@ defaults._set('bubble', {
 	}
 });
 
-module.exports = DatasetController.extend({
+export default DatasetController.extend({
 	/**
 	 * @protected
 	 */

src/controllers/controller.doughnut.js

@@ -1,15 +1,15 @@
 'use strict';
 
-var DatasetController = require('../core/core.datasetController');
-var defaults = require('../core/core.defaults');
-var elements = require('../elements/index');
-var helpers = require('../helpers/index');
+import DatasetController from '../core/core.datasetController';
+import defaults from '../core/core.defaults';
+import elements from '../elements';
+import helpers from '../helpers';
 
-var valueOrDefault = helpers.valueOrDefault;
+const valueOrDefault = helpers.valueOrDefault;
 
-var PI = Math.PI;
-var DOUBLE_PI = PI * 2;
-var HALF_PI = PI / 2;
+const PI = Math.PI;
+const DOUBLE_PI = PI * 2;
+const HALF_PI = PI / 2;
 
 defaults._set('doughnut', {
 	animation: {
@@ -98,7 +98,7 @@ defaults._set('doughnut', {
 	}
 });
 
-module.exports = DatasetController.extend({
+export default DatasetController.extend({
 
 	dataElementType: elements.Arc,
 

src/controllers/controller.horizontalBar.js

@@ -1,7 +1,7 @@
 'use strict';
 
-var BarController = require('./controller.bar');
-var defaults = require('../core/core.defaults');
+import BarController from './controller.bar';
+import defaults from '../core/core.defaults';
 
 defaults._set('horizontalBar', {
 	hover: {
@@ -43,7 +43,7 @@ defaults._set('datasets', {
 	}
 });
 
-module.exports = BarController.extend({
+export default BarController.extend({
 	/**
 	 * @private
 	 */

src/controllers/controller.line.js

@@ -1,9 +1,9 @@
 'use strict';
 
-const DatasetController = require('../core/core.datasetController');
-const defaults = require('../core/core.defaults');
-const elements = require('../elements/index');
-const helpers = require('../helpers/index');
+import DatasetController from '../core/core.datasetController';
+import defaults from '../core/core.defaults';
+import elements from '../elements';
+import helpers from '../helpers';
 
 const valueOrDefault = helpers.valueOrDefault;
 const resolve = helpers.options.resolve;
@@ -26,7 +26,7 @@ defaults._set('line', {
 	}
 });
 
-module.exports = DatasetController.extend({
+export default DatasetController.extend({
 
 	datasetElementType: elements.Line,
 

src/controllers/controller.pie.js

@@ -1,13 +1,13 @@
 'use strict';
 
-var DoughnutController = require('./controller.doughnut');
-var defaults = require('../core/core.defaults');
-var helpers = require('../helpers/index');
+import DoughnutController from './controller.doughnut';
+import defaults from '../core/core.defaults';
+import helpers from '../helpers';
 
 defaults._set('pie', helpers.clone(defaults.doughnut));
 defaults._set('pie', {
 	cutoutPercentage: 0
 });
 
 // Pie charts are Doughnut chart with different defaults
-module.exports = DoughnutController;
+export default DoughnutController;

src/controllers/controller.polarArea.js

@@ -1,11 +1,11 @@
 'use strict';
 
-var DatasetController = require('../core/core.datasetController');
-var defaults = require('../core/core.defaults');
-var elements = require('../elements/index');
-var helpers = require('../helpers/index');
+import DatasetController from '../core/core.datasetController';
+import defaults from '../core/core.defaults';
+import elements from '../elements';
+import helpers from '../helpers';
 
-var resolve = helpers.options.resolve;
+const resolve = helpers.options.resolve;
 
 defaults._set('polarArea', {
 	animation: {
@@ -85,7 +85,7 @@ defaults._set('polarArea', {
 	}
 });
 
-module.exports = DatasetController.extend({
+export default DatasetController.extend({
 
 	dataElementType: elements.Arc,
 

src/controllers/controller.radar.js

@@ -1,11 +1,11 @@
 'use strict';
 
-var DatasetController = require('../core/core.datasetController');
-var defaults = require('../core/core.defaults');
-var elements = require('../elements/index');
-var helpers = require('../helpers/index');
+import DatasetController from '../core/core.datasetController';
+import defaults from '../core/core.defaults';
+import elements from '../elements';
+import helpers from '../helpers';
 
-var valueOrDefault = helpers.valueOrDefault;
+const valueOrDefault = helpers.valueOrDefault;
 
 defaults._set('radar', {
 	spanGaps: false,
@@ -21,7 +21,7 @@ defaults._set('radar', {
 	}
 });
 
-module.exports = DatasetController.extend({
+export default DatasetController.extend({
 	datasetElementType: elements.Line,
 
 	dataElementType: elements.Point,

src/controllers/controller.scatter.js

@@ -1,7 +1,7 @@
 'use strict';
 
-var LineController = require('./controller.line');
-var defaults = require('../core/core.defaults');
+import LineController from './controller.line';
+import defaults from '../core/core.defaults';
 
 defaults._set('scatter', {
 	scales: {
@@ -34,4 +34,4 @@ defaults._set('datasets', {
 });
 
 // Scatter charts use line controllers
-module.exports = LineController;
+export default LineController;

src/controllers/index.js

@@ -1,20 +1,20 @@
 'use strict';
 
-var bar = require('./controller.bar');
-var bubble = require('./controller.bubble');
-var doughnut = require('./controller.doughnut');
-var horizontalBar = require('./controller.horizontalBar');
-var line = require('./controller.line');
-var polarArea = require('./controller.polarArea');
-var pie = require('./controller.pie');
-var radar = require('./controller.radar');
-var scatter = require('./controller.scatter');
+import bar from './controller.bar';
+import bubble from './controller.bubble';
+import doughnut from './controller.doughnut';
+import horizontalBar from './controller.horizontalBar';
+import line from './controller.line';
+import polarArea from './controller.polarArea';
+import pie from './controller.pie';
+import radar from './controller.radar';
+import scatter from './controller.scatter';
 
 // NOTE export a map in which the key represents the controller type, not
 // the class, and so must be CamelCase in order to be correctly retrieved
 // by the controller in core.controller.js (`controllers[meta.type]`).
 
-module.exports = {
+export default {
 	bar: bar,
 	bubble: bubble,
 	doughnut: doughnut,

src/core/core.animation.js

@@ -1,6 +1,6 @@
 'use strict';
 
-const helpers = require('../helpers/index');
+import helpers from '../helpers';
 
 const transparent = 'transparent';
 const interpolators = {
@@ -89,4 +89,4 @@ class Animation {
 	}
 }
 
-module.exports = Animation;
+export default Animation;

src/core/core.animator.js

@@ -1,6 +1,6 @@
 'use strict';
 
-const helpers = require('../helpers/index');
+import helpers from '../helpers';
 
 function drawFPS(chart, count, date, lastDate) {
 	const fps = (1000 / (date - lastDate)) | 0;
@@ -207,4 +207,4 @@ class Animator {
 
 const instance = new Animator();
 
-module.exports = instance;
+export default instance;

src/core/core.datasetController.js

@@ -1,11 +1,11 @@
 'use strict';
 
-var helpers = require('../helpers/index');
-var Animations = require('./core.animations');
+import helpers from '../helpers';
+import Animations from './core.animations';
 
-var resolve = helpers.options.resolve;
+const resolve = helpers.options.resolve;
 
-var arrayEvents = ['push', 'pop', 'shift', 'splice', 'unshift'];
+const arrayEvents = ['push', 'pop', 'shift', 'splice', 'unshift'];
 
 /**
  * Hooks the array methods that add or remove values ('push', pop', 'shift', 'splice',
@@ -1134,4 +1134,4 @@ helpers.extend(DatasetController.prototype, {
 
 DatasetController.extend = helpers.inherits;
 
-module.exports = DatasetController;
+export default DatasetController;

src/core/core.layouts.js

@@ -1,9 +1,9 @@
 'use strict';
 
-var defaults = require('./core.defaults');
-var helpers = require('../helpers/index');
+import defaults from './core.defaults';
+import helpers from '../helpers';
 
-var extend = helpers.extend;
+const extend = helpers.extend;
 
 const STATIC_POSITIONS = ['left', 'top', 'right', 'bottom'];
 
@@ -227,7 +227,7 @@ defaults._set('layout', {
 // The layout service is very self explanatory.  It's responsible for the layout within a chart.
 // Scales, Legends and Plugins all rely on the layout service and can easily register to be placed anywhere they need
 // It is this service's responsibility of carrying out that layout.
-module.exports = {
+export default {
 	defaults: {},
 
 	/**

src/core/core.plugins.js

@@ -1,7 +1,7 @@
 'use strict';
 
-var defaults = require('./core.defaults');
-var helpers = require('../helpers/index');
+import defaults from './core.defaults';
+import helpers from '../helpers/';
 
 defaults._set('plugins', {});
 
@@ -10,7 +10,7 @@ defaults._set('plugins', {});
  * @namespace Chart.plugins
  * @since 2.1.0
  */
-module.exports = {
+export default {
 	/**
 	 * Globally registered plugins.
 	 * @private

src/core/core.scale.js

@@ -1,9 +1,9 @@
 'use strict';
 
-const defaults = require('./core.defaults');
-const Element = require('./core.element');
-const helpers = require('../helpers/index');
-const Ticks = require('./core.ticks');
+import defaults from './core.defaults';
+import Element from './core.element';
+import helpers from '../helpers';
+import Ticks from './core.ticks';
 
 const alignPixel = helpers.canvas._alignPixel;
 const isArray = helpers.isArray;
@@ -1438,4 +1438,4 @@ class Scale extends Element {
 
 Scale.prototype._draw = Scale.prototype.draw;
 
-module.exports = Scale;
+export default Scale;

src/core/core.scaleService.js

@@ -1,10 +1,10 @@
 'use strict';
 
-var defaults = require('./core.defaults');
-var helpers = require('../helpers/index');
-var layouts = require('./core.layouts');
+import defaults from './core.defaults';
+import helpers from '../helpers';
+import layouts from './core.layouts';
 
-module.exports = {
+export default {
 	// Scale registration object. Extensions can register new scale types (such as log or DB scales) and then
 	// use the new chart options to grab the correct scale
 	constructors: {},

src/core/core.ticks.js

@@ -1,13 +1,13 @@
 'use strict';
 
-var helpers = require('../helpers/index');
-var math = helpers.math;
+import helpers from '../helpers';
+const math = helpers.math;
 
 /**
  * Namespace to hold static tick generation functions
  * @namespace Chart.Ticks
  */
-module.exports = {
+export default {
 	/**
 	 * Namespace to hold formatters for different types of ticks
 	 * @namespace Chart.Ticks.formatters