Signals — TC39

Install

yarn add @umpire/core @umpire/signals signal-polyfill

Usage

import { tc39Adapter } from '@umpire/signals/tc39'
import { reactiveUmp } from '@umpire/signals'

const reactive = reactiveUmp(myUmp, tc39Adapter)

Example

import { tc39Adapter } from '@umpire/signals/tc39'
import { reactiveUmp } from '@umpire/signals'

const reactive = reactiveUmp(myUmp, tc39Adapter)

reactive.set('accountType', 'business')
console.log(reactive.field('companyName').enabled) // true

Fouls

The TC39 proposal does not include effect(). Fouls tracking is not available with this adapter — reading reactive.fouls or calling reactive.foul() will throw.

Field availability works normally.

When to use this

The TC39 adapter is useful for environments targeting the eventual native signal API, or for server-side availability checks where fouls tracking isn’t needed. For full functionality including fouls, use the Preact or alien-signals adapter instead.