Zustand

This plugin allows you to capture Zustand mutations/state and inspect them later on while replaying session recordings. This is very useful for understanding and fixing issues.

Installation

npm i @openreplay/tracker-zustand

Usage

Initialize the @openreplay/tracker package as usual and load the plugin into it. Call the plugin and to set up the store name, this will return a named store tracker instance which you can call with your store exemplar as an argument to enable tracking of this store.

If your website is a Single Page Application (SPA)

import Tracker from '@openreplay/tracker';
import trackerZustand from '@openreplay/tracker-zustand';

If your web app is Server-Side-Rendered (SSR)

import Tracker from '@openreplay/tracker/cjs';
import trackerZustand from '@openreplay/tracker-zustand/cjs';

Tracking the Zustand Store

import create from "zustand";
import Tracker from '@openreplay/tracker';
import trackerZustand, { StateLogger } from '@openreplay/tracker-zustand';


const tracker = new Tracker({
  projectKey: YOUR_PROJECT_KEY,
});

// as per https://docs.pmnd.rs/zustand/guides/typescript#middleware-that-doesn't-change-the-store-type
// cast type to new one
// but this seems to not be required and everything is working as is
const zustandPlugin = tracker.use(trackerZustand()) as unknown as StateLogger


const useBearStore = create(
  zustandPlugin((set: any) => ({
    bears: 0,
    increasePopulation: () => set((state: any) => ({ bears: state.bears + 1 })),
    removeAllBears: () => set({ bears: 0 }),
  }),
    // store name is optional
    // and is randomly generated if undefined
  'bear_store'
  )
)

Options

You can customize the plugin behavior with options to sanitize your data. They are similar to the ones from the standard createLogger plugin.

trackerZustand({
  filter (mutation, state) {
    // returns `true` if a mutation should be logged
    // `mutation` is a `{ type, payload }`
    return mutation.type !== "aBlacklistedMutation";
  },
  transformer (state) {
    // transform the state before logging it.
    // for example return only a specific sub-tree
    return state.subTree;
  },
  mutationTransformer (mutation) {
    // mutations are logged in the format of `{ type, payload }`
    // we can format it any way we want.
    return mutation.type;
  },
})

Have questions?

Having trouble setting up this plugin? please connect to our Slack or check out our Forum and get help from our community.