Add reducerPath to extractRehydrationInfo

[msutkowski]

• Adds the ability for a consumer to have a little safety when setting up for SSR:

extractRehydrationInfo: (action, { reducerPath }) => {
    if (action.type === HYDRATE) {
      return action.payload[reducerPath];
    }
  },

In favor of #1643

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size-limit report 📦

Path	Size
1. entry point: @reduxjs/toolkit (cjs.production.min.js)	12.28 KB (0%)
1. entry point: @reduxjs/toolkit (esm.js)	10.27 KB (0%)
1. entry point: @reduxjs/toolkit/query (cjs.production.min.js)	21.01 KB (+0.06% 🔺)
1. entry point: @reduxjs/toolkit/query (esm.js)	18.04 KB (+0.14% 🔺)
1. entry point: @reduxjs/toolkit/query/react (cjs.production.min.js)	23.09 KB (+0.05% 🔺)
1. entry point: @reduxjs/toolkit/query/react (esm.js)	20.71 KB (+0.13% 🔺)
2. entry point: @reduxjs/toolkit (without dependencies) (cjs.production.min.js)	5.6 KB (0%)
2. entry point: @reduxjs/toolkit (without dependencies) (esm.js)	5.58 KB (0%)
2. entry point: @reduxjs/toolkit/query (without dependencies) (cjs.production.min.js)	9.8 KB (+0.13% 🔺)
2. entry point: @reduxjs/toolkit/query (without dependencies) (esm.js)	10.23 KB (+0.17% 🔺)
2. entry point: @reduxjs/toolkit/query/react (without dependencies) (cjs.production.min.js)	2.63 KB (0%)
2. entry point: @reduxjs/toolkit/query/react (without dependencies) (esm.js)	2.47 KB (0%)
3. createSlice (esm.js)	5.16 KB (0%)
3. createEntityAdapter (esm.js)	5.83 KB (0%)
3. configureStore (esm.js)	5.83 KB (0%)
3. createApi (esm.js)	16.34 KB (+0.17% 🔺)
3. createApi (react) (esm.js)	18.97 KB (+0.12% 🔺)
3. fetchBaseQuery (esm.js)	10.98 KB (0%)
3. setupListeners (esm.js)	9.86 KB (0%)
3. ApiProvider (esm.js)	17.8 KB (+0.13% 🔺)

[msutkowski]

This could also be done with:

type ReducerPathFromCreateApiOptions<
  Options extends CreateApiOptions<any, any, any, any>
> = Options extends CreateApiOptions<any, any, infer RP, any> ? RP : unknown

reducerPath: (options.reducerPath ?? 'api') as ReducerPathFromCreateApiOptions<typeof options>,

But I don't think there is any need to do that.

[phryneas]

let's reaaaally not do that ^^