[Home](./index.md) > [@empathyco/x-components](./x-components.md) > [MutationsTree](./x-components.mutationstree.md) ## MutationsTree type Type-safe mutations definition type. An object with this type is what it is needed to define [Vuex](https://vuex.vuejs.org/) mutations. **Signature:** ```typescript export type MutationsTree> = { [Key in keyof Mutations]: (state: State, payload: ExtractPayload) => void; }; ``` **References:** [MutationsDictionary](./x-components.mutationsdictionary.md), [ExtractPayload](./x-components.extractpayload.md)