replacer function for the JSON.stringify() with depth and duplicates control

JSON.replacer.js

const replacer = function( depth = Number.MAX_SAFE_INTEGER ) {
  let objects, stack, keys;
  return function(key, value) {
    //  very first iteration
    if (key === '') {
      keys = ['root'];
      objects = [{keys: 'root', value: value}];
      stack = [];
      return value;
    }

    //  From the JSON.stringify's doc: "The object in which the key was found is 
    //  provided as the replacer's this parameter."
    //  Thus one can control the depth
    while ( stack.length && this !== stack[0] ) {
      stack.shift();
      keys.pop();
    }
    // console.log( keys.join('.') );

    let type = typeof value;
    if ( type === 'boolean' || type === 'number' || type === 'string' ) {
      return value;
    }
    if ( type === 'function' ) {
      return `[Function, ${value.length + 1} args]`;
    }
    if (value === null) {
      return 'null';
    }
    if (!value) {
      return undefined;
    }
    if (stack.length >= depth ) {
      if ( Array.isArray(value) ) {
        return `[Array(${value.length})]`;
      }
      return '[Object]';
    }
    let found = objects.find( o => o.value === value );
    if ( !found ) {
      keys.push( key );
      stack.unshift( value );
      objects.push({keys: keys.join('.'), value: value});
      return value;
    }
    //  actually, here's the only place where the keys keeping is useful
    return `[Duplicate: ${found.keys}]`;
  };
};

//  Usage
console.log( JSON.stringify( someObject, replacer(2), 2 ) );
console.log( JSON.stringify( someObject, replacer(), 2 ) );

and for full depth (JSON.stringify( data, replacer(), 2 ))

{
  "channels": [
    {
      "type": "console",
      "colors": true,
      "tags": [
        "*"
      ]
    },
    {
      "type": "file",
      "path": "logs/log.log",
      "tags": [
        "info",
        "warn",
        "error"
      ]
    },
    {
      "type": "file",
      "path": "logs/debug.log",
      "tags": [
        "debug"
      ]
    }
  ],
  "tags": {
    "debug": {
      "color": "blue"
    },
    "info": {
      "color": "green"
    },
    "warn": {
      "color": "yellow"
    },
    "error": {
      "color": "red"
    }
  },
  "show": "[Function, 4 args]",
  "maxTicks": 414,
  "test": {
    "intentionallyNull": "null",
    "dup": {
      "url": "http://kafka.nowhere.com:3131"
    }
  },
  "api": {
    "operatorId": "JOHNDOE",
    "profile": {
      "url": "http://nowhere.com/profile"
    },
    "policies": {
      "url": "http://nowhere.com/policies"
    },
    "kafka": "[Duplicate: root.test.dup]"
  },
  "self": "[Duplicate: root]"
}