/* IMPORT */

import { frozen } from '~/objects/callable'

/* MAIN */
const DIRTY_NO: number = 0 // The observer is not dirty, for sure
const DIRTY_MAYBE_NO: number = 1 // The observer is not dirty, possibly
const DIRTY_MAYBE_YES: number = 2 // The observer is dirty, possibly
const DIRTY_YES: number = 3 // The observer is dirty, for sure

const OBSERVABLE_FALSE = frozen(false)
const OBSERVABLE_TRUE = frozen(true)

const UNAVAILABLE: any = new Proxy({}, new Proxy({}, { get() { throw new Error('Unavailable value') } })) //TSC
const UNINITIALIZED: any = function () { } //TSC

/* EXPORT */

export { DIRTY_NO, DIRTY_MAYBE_NO, DIRTY_MAYBE_YES, DIRTY_YES }
export { OBSERVABLE_FALSE, OBSERVABLE_TRUE }
export { UNAVAILABLE, UNINITIALIZED }