How to store the clustered values into file

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I have one question after cluster the values I want to store it in file.
after super cluster object initialize I am getting the following response
```
Supercluster {
options: { log: true, radius: 60, extent: 512, maxZoom: 16 },
trees:
[ KDBush {
nodeSize: 64,
points: [Array],
ids: [Uint16Array],
coords: [Float32Array] },
KDBush {
nodeSize: 64,
points: [Array],
ids: [Uint16Array],
coords: [Float32Array] },
points:
[ { type: 'Feature', properties: [Object], geometry: [Object] },
{ type: 'Feature', properties: [Object], geometry: [Object] },
{ type: 'Feature', properties: [Object], geometry: [Object] },
{ type: 'Feature', properties: [Object], geometry: [Object] },
{ type: 'Feature', properties: [Object], geometry: [Object] },
{ type: 'Feature', properties: [Object], geometry: [Object] },
{ type: 'Feature', properties: [Object], geometry: [Object] },
{ type: 'Feature', properties: [Object], geometry: [Object] },
{ type: 'Feature', properties: [Object], geometry: [Object] },
{ type: 'Feature', properties: [Object], geometry: [Object] },
{ type: 'Feature', properties: [Object], geometry: [Object] },
{ type: 'Feature', properties: [Object], geometry: [Object] },
{ type: 'Feature', properties: [Object], geometry: [Object] },
{ type: 'Feature', properties: [Object], geometry: [Object] },
{ type: 'Feature', properties: [Object], geometry: [Object] } ] }
```

When I convert and write into a file. Format is changing
I am using Node js. Before writing into file i am `JSON.stringify`
After that stringify I am getting response like this

```
{
"options": {
"log": true,
"radius": 60,
"extent": 512,
"maxZoom": 16
},
"trees": [
{
"nodeSize": 64,
"points": [
{
"x": 0.24396358761574075,
"y": 0.38899943574185264,
"zoom": null,
"id": 1,
"parentId": -1,
"numPoints": 12,
"properties": null
},
{
"x": 0.7360923611111111,
"y": 0.4629351025691785,
"zoom": null,
"id": 33,
"parentId": -1,
"numPoints": 2,
"properties": null
}etc
```

supercluster name and KDBUSH also missed in that.
Please suggest something

Start by reviewing the Supercluster and KDBush objects shown in the issue and check the library's documented entry points for persistence or reconstruction. The issue names no source file or test, so first determine whether serialization is intended to be supported; done should be a documented way to store and restore clustered values without relying on incidental object names.

Written by the indexing model from the issue text.