Cannot find the bundled JS file in the package
Cannot find the bundled lib/index.js in the installed package through npm install ng2-ckeditor . Here is the package structure:

If you are working with angular framework you don't need lib/index.js file. Please check the demo project on stackblitz and create your own example on stackblitz environment.
@kzimny , what config should be set in SystemJS config? We are using SystemJS to load and compile our Angular app. Here is our current config:
System.config({
map: {
'ng2-ckeditor': 'npm:ng2-ckeditor'
},
packages: {
'ng2-ckeditor': {
main: 'bundles/ng2-ckeditor.umd.js',
defaultExtension: 'js'
},
},
});
When modules are flagged as ECMAScript modules, the Node runtime uses a different pattern or method for resolving file imports. Read the following description. Try to import as follow (not tested):
System.config({
map: {
'ng2-ckeditor': 'npm:ng2-ckeditor'
},
packages: {
'ng2-ckeditor': {
main: 'esm2020/index.mjs',
defaultExtension: 'mjs'
},
},
});