immutator

a redux-inspired state mutator.

npm install immutator

be aware: immutator uses Proxy. see node support and browser support.

example

const immutator = require('immutator')
 
const state = immutator({ count: 0 })
 
try {
  state.count++
} catch (err) {
  console.log('Error: state cannot be mutated directly. please define a mutator.')
}
 
console.log(state) // { count: 0 }
 
// define mutator `increment`
state.increment = state => state.count++
 
// call mutator
state.increment() 
 
console.log(state) // { count: 1 }

state is a proxy whose target can only be mutated by defining and calling a mutator.

functions defined on the immutator are mutators. mutators are passed a mutable copy of state as their first argument when they are called. while they share the same namespace, defining a mutator does not affect state.

api

const immutable_state = immutator(initial_state={})

immutable_state[mutation_type] = mutator(mutable_state, ...mutation_data)

immutable_state[mutation_type](...mutation_data)