safe-json-stringify | handles circular references and prevent | JSON Processing library

My requirement is to convert JSON object to string. For this, simply JSON.stringify() doesn't work here because it contains circular references. I searched on the internet then I found a package which does this work for me. But in the usage of the package it is mentioned like const safeJsonStringify = require('safe-json-stringify');. But here the problem is that in Angualar 4 doesn't support require() function anymore. In latest versions of Angular (from version 2), we have import statements. It is like if we have a class is exported in the package then we can directly import that class from the package.

Any suggestions ??

Thanks in advance!!