Can't set the $pristine on constructor

Let's say you are using a directive that has problem with pristine, i.e., on first load the aForm is already dirty:

<form name="c.aForm">
<someDirectiveWithBugHere></someDirectiveWithBugHere>
</form>

<div>{{c.aForm.$pristine}}</div>

You can't set the aForm to pristine on constructor, as aForm is not yet defined while on constructor:

module App.UserEdit
{
    export class MainController
    {
        aForm: ng.IFormController;

        constructor(public Resources: InhouseLib.Resources)
        {
             this.aForm.$setPristine();

        }
    }
}

Setting the form to pristine while on constructor would give this result:

TypeError: Cannot read property '$setPristine' of undefined
    at new MainController

A work-around is to set the pristine state after the form is loaded, and by calling the expression (that will set the pristine to clean) on ng-init:

<form name="c.aForm">
<someDirectiveWithBugHere></someDirectiveWithBugHere>
</form>
<div ng-init="c.setClean()"></div>

<div>{{c.aForm.$pristine}}</div>

Remove the $setPristine from the controller and move it to setClean:

module App.UserEdit
{
    export class MainController
    {

        aForm: ng.IFormController;

        constructor(public Resources: InhouseLib.Resources)
        {
        }
    
        setClean(): void
        {
            this.aForm.$setPristine();
        }
    }
}

Or if you don't want the controller to have concerns on those stuff, you can initialize the form's state directly on html.

<div ng-init="c.aForm.$setPristine();"></div>

<div>{{c.aForm.$pristine}}</div>