Converting circular structure to JSON

censor.ts

function censor(censor: any) {
  let i = 0

  return function(_: any, value: unknown) {
    if (i !== 0 && typeof censor === 'object' && typeof value === 'object' && censor === value) {
      return '[Circular]'
    }

    // seems to be a harded maximum of 11 serialized objects?
    if (i >= 10) {
      return '[Unknown]'
    }

    ++i // so we know we aren't using the original object anymore

    return value
  }
}

example.ts

JSON.stringify(obj, censor(obj))