hello.component.ts

import { Component, Input } from '@angular/core';
import { Value, isBool, isNotNull } from '@trademe/ensure';

@Component({
    selector: 'hello'
    // ...
})
export class HelloComponent  {
    private _primary: boolean;
    @Input()
    public get primary (): boolean {
        let val = this._primary;
        val = isNotNull(val, 'primary');
        return val;
    }
    public set primary (value: boolean) {
        let val = value;
        val = isBool(val, 'primary');
        this._primary = val;
    }
}