@tanstack/react-store/src/index.ts

Framework agnostic type-safe store w/ reactive framework adapters

export * from '@tanstack/store'

export { useStore } from './useStore'

export function shallow<T>(objA: T, objB: T) {
  if (Object.is(objA, objB)) {
    return true
  }

  if (
    typeof objA !== 'object' ||
    objA === null ||
    typeof objB !== 'object' ||
    objB === null
  ) {
    return false
  }

  if (objA instanceof Map && objB instanceof Map) {
    if (objA.size !== objB.size) return false
    for (const [k, v] of objA) {
      if (!objB.has(k) || !Object.is(v, objB.get(k))) return false
    }
    return true
  }

  if (objA instanceof Set && objB instanceof Set) {
    if (objA.size !== objB.size) return false
    for (const v of objA) {
      if (!objB.has(v)) return false
    }
    return true
  }

  if (objA instanceof Date && objB instanceof Date) {
    if (objA.getTime() !== objB.getTime()) return false
    return true
  }

  const keysA = getOwnKeys(objA)
  if (keysA.length !== getOwnKeys(objB).length) {
    return false
  }

  // eslint-disable-next-line @typescript-eslint/prefer-for-of
  for (let i = 0; i < keysA.length; i++) {
    if (
      !Object.prototype.hasOwnProperty.call(objB, keysA[i] as string) ||
      !Object.is(objA[keysA[i] as keyof T], objB[keysA[i] as keyof T])
    ) {
      return false
    }
  }
  return true
}

function getOwnKeys(obj: object): Array<string | symbol> {
  return (Object.keys(obj) as Array<string | symbol>).concat(
    Object.getOwnPropertySymbols(obj),
  )
}