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Doc: Add explanation of how migrations work #1369

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Doc: Add explanation of how migrations work #1369

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7 changes: 6 additions & 1 deletion docs/migrations.md
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# Redux Persist Migration Example

Redux Persist takes all functions from `migrations` above the inbound persisted store version and runs them in ascending order (by version key) to return the final state

It's mean every time you update your state schema and want to support users with persisted data -- you have to create migration and increase a `version` in [config object](https://github.com/rt2zz/redux-persist/blob/master/types/types.d.ts#L27)

## Redux Persist Migration Example

### Example with createMigrate
```js
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