Fix rrule import in bundle (#3617)

Author: Lykoi18

packages/dx-scheduler-core/package.json

@@ -65,6 +65,7 @@
     "rollup-plugin-babel": "^4.3.3",
     "rollup-plugin-license": "^0.12.1",
     "rollup-plugin-typescript2": "^0.30.0",
+    "rollup-plugin-modify": "^3.0.0",
     "tslib": "^2.4.1",
     "typescript": "^4.8.4"
   },

packages/dx-scheduler-core/rollup.config.js

@@ -2,6 +2,7 @@ import license from 'rollup-plugin-license';
 import { default as typescriptRollup } from 'rollup-plugin-typescript2';
 import replace from '@rollup/plugin-replace';
 import typescript from 'typescript';
+import modify from 'rollup-plugin-modify';
 import {
   banner, external, globals, stubProcess,
 } from '../../tools/rollup-utils';
@@ -25,6 +26,10 @@ export default {
       '/** @class */': '/*#__PURE__*/',
       delimiters: ['', ''],
     }),
+    modify({
+      find: /import {(.+)} from 'rrule';/,
+      replace: (match, name) => `import rrulePkg from 'rrule/dist/es5/rrule.js'; const {${name}} = rrulePkg;`,
+    }),
     license({
       banner,
     }),