MAPJC is simple usage helper to coercing json to object.

 npm i mapjc

 NOTE: "experimentalDecorators": true in tsconfig.json

 import MAPJC from 'mapjc';
 
 or

 import { Model, Prop, PropArr, sinCoerce, multiCoerce }  from 'mapjc';

 enum ACCESS_TYPE {
      FULL = 'FULL',
      LIMITED = 'LIMITED'
 }

 @Model
 class Role {
      @Prop(Number)
      id: number = -1;

      @Prop(String)
      name: string = "";

      @Prop(ACCESS_TYPE)
      type: ACCESS_TYPE = ACCESS_TYPE.LIMITED;

      // your other codes
 }

 @Model
 class User {
      @Prop(Number)
      id!: number;

      @Prop(String)
      name!: string;

      @Prop(Boolean)
      isActive!: boolean;

      @Prop(String, { optional: true })
      act?: string;

      @PropArr(Role, { optional: true, from: 'userRoles' })
      roles!: Role[] = [];

      // your other codes
 }

 @Model
 class GuestUser extends User {
      @Prop(Date)
      joinTime!: Date;

      @Prop(Date)
      expiryTime!: Date;

      @Prop(Role)
      role!: Role;

      // your other codes

      // exaample
      toString() {
           const line = `
                ${this.id}\n
                ${this.name}\n
                ${this.isActive}\n
                ${this.act}\n
                ${this.expiryTime}\n
                ${this.role}\n
           `;

           console.log(line);
      }

      public isAcessExiperd(): boolean {
           const now = Date.now();
           const isExpired = Boolean(now > this.expiryTime.getTime());
           return isExpired;
      }
 }

 const allRoles = [
      { id: 1, name: "Admin", type: "FULL" },
      { id: 3, name: 'Guest', type: "LIMITED" },
 ]

 const nomUser = {
      id: 0,
      name: 'User',
      isActive: true,
      userRoles: [],
 }

 const gueUser = {
      id: 1,
      name: 'Guest',
      isActive: true,
      joinTime: "2021-04-21T19:02:51.521Z",
      expiryTime: "2021-04-23T19:02:51.521Z",
      role: {
           id: 3,
           name: 'Guest',
           type: "LIMITED"
      }
 }

 const roles: Role[] = MAPJC.multiCoerce(Role, allRoles);
 const user: User = MAPJC.sinCoerce(User, nomUser);
 const guestUser: GuestUser = MAPJC.sinCoerce(GuestUser, gueUser);

 @Model
 class NodeGrp {
      @Prop(Number)
      level!: number;

      @Prop(String)
      name!: string;

      // self referencing
      @Prop(() => NodeGrp, { optional: true })
      node?: NodeGrp;

      // your other codes
 }

 const nodeGrp = {
      level: 1,
      name: 'Item - 1',
      node: {
           level: 2,
           name: 'Item - 1.1',
           node: {
                level: 3,
                name: 'Item - 1.1.1',
           }
      }
 }

 const grpNode: NodeGrp = MAPJC.sinCoerce(NodeGrp, nodeGrp);

 @Model
 class Menu {
      @Prop(Number)
      id!: number;

      @Prop(String)
      label!: string;

      // self referencing
      @PropArr(() => Menu, { optional: true })
      chidren: Menu[] = [];

      // your other codes
 }

 const _menu = [
      {
           id: 1,
           label: 'Node 1',
           chidren: [
                {
                     id: 2,
                     label: 'Node 1.1'
                },
                {
                     id: 3,
                     label: 'Node 1.2'
                }
           ]
      },
      {
           id: 4,
           label: 'Node 2'
      }
 ]

 const menu: Menu = MAPJC.multiCoerce(Menu, _menu);

CHANGE LOG Repository change