app-state-utils/index.d.ts

A set of utilities for state management in web apps, integrates well with front-end state management libraries like redux and vuex, and can be used on server side as well. It defines methods for mutating keys and values in a conventional javascript object

type MutationHelperMethod = ((state: object) => object) | ((state: any) => any)

interface MutationHelperMethods {
    createEntry: MutationHelperMethod
    updateValue: MutationHelperMethod
    clearValue: MutationHelperMethod
    deleteEntry: MutationHelperMethod
    logState: MutationHelperMethod
}

declare function MutationHelper (state: object): MutationHelperMethods;