chore: turn into ES module

Author: nikku

lib/diff.js

@@ -1,4 +1,4 @@
-import Differ from './differ';
+import Differ from './differ.js';
 
 export default function diff(a, b, handler) {
   return new Differ().diff(a, b, handler);

lib/differ.js

@@ -8,7 +8,7 @@ import {
   DiffPatcher
 } from 'diffpatch';
 
-import ChangeHandler from './change-handler';
+import ChangeHandler from './change-handler.js';
 
 
 export default function Differ() { }

lib/index.js

@@ -1,7 +1,7 @@
 export {
   default as Differ
-} from './differ';
+} from './differ.js';
 
 export {
   default as diff
-} from './diff';
+} from './diff.js';

package-lock.json

@@ -6,11 +6,17 @@
     "all": "run-s lint test",
     "lint": "eslint .",
     "pretest": "rollup -c --bundleConfigAsCjs",
-    "test": "mocha -r esm test/spec/*.js",
+    "test": "mocha test/spec/*.js",
     "prepublishOnly": "rollup -c --bundleConfigAsCjs"
   },
-  "main": "dist/index.cjs.js",
-  "module": "dist/index.esm.js",
+  "exports": {
+    "./package.json": "./package.json",
+    ".": {
+      "import": "./dist/index.esm.js",
+      "node": "./dist/index.cjs.js"
+    }
+  },
+  "type": "module",
   "repository": {
     "type": "git",
     "url": "https://github.com/bpmn-io/bpmn-js-differ"
@@ -36,7 +42,6 @@
     "chai": "^4.1.2",
     "eslint": "^8.57.0",
     "eslint-plugin-bpmn-io": "^1.0.1",
-    "esm": "^3.0.24",
     "mocha": "^8.4.0",
     "npm-run-all": "^4.1.2",
     "rollup": "^4.19.0"

package.json

@@ -11,9 +11,9 @@ import BpmnModdle from 'bpmn-moddle';
 import {
   Differ,
   diff
-} from '../../';
+} from 'bpmn-js-differ';
 
-import SimpleChangeHandler from '../../lib/change-handler';
+import SimpleChangeHandler from '../../lib/change-handler.js';
 
 
 describe('diffing', function() {