Like is-circular, but returns the path to the first circular reference found.

npm install @cypress/what-is-circular

Returns an array that contains the path to the first circular reference found, or undefined if no circular reference is found.

var whatIsCircular = require('@cypress/what-is-circular')

var circularObj = {
  foo: 1,
  bar: 2
}
// qux.baz is the circular reference
circularObj.qux = {
  baz: circularObj
}

whatIsCircular(circularObj) // ['qux', 'baz']

var obj = {
  foo: 1,
  bar: 2,
  qux: 3
}

whatIsCircular(obj) // undefined

MIT

Thanks to @tjmehta's is-circular for providing the tests and README for this project.

Thanks to @angus-c's just-is-circular for contributing additional tests.