title: Query Builder Plugin for Angular 4
body: <p>I need a query builder plugin for Angular 4 to build nested queries which I can use in my project.</p>
  
  <p>I came across some of them like:<br>
  <a href="https://www.npmjs.com/package/angular2-query-builder" rel="nofollow noreferrer">https://www.npmjs.com/package/angular2-query-builder</a> (Requires Angular4+ )<br>
  <a href="http://mfauveau.github.io/angular-query-builder/" rel="nofollow noreferrer">http://mfauveau.github.io/angular-query-builder/</a> (For AngularJS)<br>
  <a href="http://niklr.github.io/angular-query-builder/" rel="nofollow noreferrer">http://niklr.github.io/angular-query-builder/</a> (For Angular JS).<br></p>
  
  <p>The problem is that they either require Angular4+ or they are for AngularJS. Since my project is in Angular 4, I am not entire sure if using any one of them will help me or it might break my application due to Angular version dependency mismatch. Since it is an enterprise project, I can't afford to upgrade the Angular version to 6 since it has many third party plugins based on Angular 4 and might also cause some problems in build and deployment pipeline. </p>
  
  <p>I want to know if there exists a query builder plugin for Angular 4 or I can use any one of the above mentioned plugins without causing any regression due to Angular version mismatch.</p>