useUnit Hook

Using the ActiveJS is similar to RxJS Observables and other observable and subscription-based libraries.

However, if you don't want to create a useState and useEffect binding every time you use a Unit, you can create a custom Hook for using ActiveJS Units, and pass the Unit to useUnit Hook to bind the Unit with your React component.

useUnit Hook:

import { useState, useEffect } from "react";
import { UnitBase } from "@activejs/core";

const bind = <T extends Function>(method: T, thisArg: any): T =>

export type UnitValueType<T> = T extends UnitBase<infer X> ? X : never

export function useUnit<U extends UnitBase<any>>(unit: U) {
  type T = UnitValueType<U>
  const [value, setValue] = useState<T>()

  useEffect(() => {
    const subscription = unit.subscribe(setValue);
    return () => subscription.unsubscribe();
  }, [])

  return {
    dispatch: bind(unit.dispatch, unit),
    resetValue: bind(unit.resetValue, unit)


  • See this for basic usage.

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