Updates codebase from commonjs to es-modules syntax

example.js

@@ -1,4 +1,5 @@
-var AutoLayout = require('bpmn-auto-layout');
+import AutoLayout from 'bpmn-auto-layout';
+import fs from 'fs/promises';
 
 var diagramXML = `
 <?xml version="1.0" encoding="UTF-8"?>
@@ -60,9 +61,6 @@ var diagramXML = `
 
 var autoLayout = new AutoLayout();
 
-var fs = require('fs').promises;
-
-
 (async () => {
 
   var layoutedDiagramXML = await autoLayout.layoutProcess(diagramXML);

index.js

@@ -1 +1 @@
-module.exports = require('./lib/AutoLayout');
+export { default } from './lib/AutoLayout.js';

lib/AutoLayout.js

@@ -1,24 +1,18 @@
-var BpmnModdle = require('bpmn-moddle');
-var Tree = require('./Tree');
-var DiFactory = require('./DiFactory');
+import BpmnModdle from 'bpmn-moddle';
 
-var DiUtil = require('./DiUtil');
-
-var is = DiUtil.is;
-var getExpandedBounds = DiUtil.getExpandedBounds;
-var getBendpoints = DiUtil.getBendpoints;
+import Tree from './Tree.js';
+import DiFactory from './DiFactory.js';
+import { is,getExpandedBounds, getBendpoints } from './DiUtil.js';
 
 var PADDING_NODE = 'padding_node';
 
 
-function AutoLayout() {
+export default function AutoLayout() {
   this.moddle = new BpmnModdle();
   this.DiFactory = new DiFactory(this.moddle);
   this.nodeCount = -1;
 }
 
-module.exports = AutoLayout;
-
 AutoLayout.prototype.layoutProcess = async function(xmlStr) {
   var self = this;
   var moddle = this.moddle;

lib/DiFactory.js

@@ -1,23 +1,12 @@
 'use strict';
 
-var map = require('min-dash').map;
-var assign = require('min-dash').assign;
-var pick = require('min-dash').pick;
+import { map, assign, pick } from 'min-dash';
+import { is, connectRectangles, getExpandedBounds } from './DiUtil.js';
 
-var DiUtil = require('./DiUtil');
-
-var is = DiUtil.is;
-var connectRectangles = DiUtil.connectRectangles;
-var getExpandedBounds = DiUtil.getExpandedBounds;
-
-
-function DiFactory(moddle) {
+export default function DiFactory(moddle) {
   this._model = moddle;
 }
 
-module.exports = DiFactory;
-
-
 DiFactory.prototype._isExpanded = function(element) {
   return element && element.flowElements ? element.flowElements.length > 0 : false;
 };

lib/DiUtil.js

@@ -248,7 +248,7 @@ function is(type, expected) {
   return findType;
 }
 
-module.exports = {
+export {
   getExpandedBounds,
   connectRectangles,
   connectPoints,

lib/Tree.js

@@ -80,7 +80,7 @@ TreeNode.prototype._getLastChild = function() {
   return this._getChildAt(this._getChildrenCount() - 1);
 };
 
-function Tree() {
+export default function Tree() {
   this.config = {
     iMaxDepth: 1000,
     iLevelSeparation: 40,
@@ -101,8 +101,6 @@ function Tree() {
   this.iLastSearch = 0;
 }
 
-module.exports = Tree;
-
 // Layout algorithm
 Tree._firstWalk = function(tree, node, level, prevSiblings = []) {