How to update a variable in class of Object In Typescript?

I have a class of object

Class file (consumption.ts)

export class ConsumptionDetails {
Id: string;
Status: string;
Description: string;
Quantity: number;
}

Function 1: (consumption.component.ts)

this.lineItems$.subscribe((result: BindingState<ConsumptionDetails>) => {
 if(result){
   this.tempObj = result;
 }
}

Function 2: (consumption.component.ts)

this.tempObj.Status = 'Submitted';
console.log(this.tempObj);

Here 'Submitted' status not updated with 'tempObj.Status', Instead of I am getting error

ERROR TypeError: Cannot add property Status, object is not extensible