proxyMap
use a js Map with Valtio
This utility creates a proxy which mimics the native Map behavior. The API is the same as the Map API.
import { proxyMap } from 'valtio/utils'
const state = proxyMap()
state.size // ---> 0
state.set(1, 'hello')
state.size // ---> 1
state.delete(1)
state.size // ---> 0
Nesting
It can be used inside a proxy as well.
import { proxyMap } from 'valtio/utils'
const state = proxy({
count: 1,
map: proxyMap(),
})
When using an object as a key, you can wrap it with ref so it's not proxied. This is useful if you want to preserve the key equality
import { proxyMap } from 'valtio/utils'
// with ref
const key = ref({})
state.set(key, 'hello')
state.get(key) //hello
// without ref
const key = {}
state.set(key, 'value')
state.get(key) //undefined