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1 | import { Injectable } from '@angular/core'; | |
2 | ||
3 | export type InternalStateType = { | |
4 | [key: string]: any | |
5 | }; | |
6 | ||
7 | @Injectable() | |
8 | export class AppState { | |
9 | ||
10 | public _state: InternalStateType = { }; | |
11 | ||
12 | // already return a clone of the current state | |
13 | public get state() { | |
14 | return this._state = this._clone(this._state); | |
15 | } | |
16 | // never allow mutation | |
17 | public set state(value) { | |
18 | throw new Error('do not mutate the `.state` directly'); | |
19 | } | |
20 | ||
21 | public get(prop?: any) { | |
22 | // use our state getter for the clone | |
23 | const state = this.state; | |
24 | return state.hasOwnProperty(prop) ? state[prop] : state; | |
25 | } | |
26 | ||
27 | public set(prop: string, value: any) { | |
28 | // internally mutate our state | |
29 | return this._state[prop] = value; | |
30 | } | |
31 | ||
32 | private _clone(object: InternalStateType) { | |
33 | // simple object clone | |
34 | return JSON.parse(JSON.stringify( object )); | |
35 | } | |
36 | } |