Угловой динамический класс
<button [ngClass]="type === 'mybutton' ? namespace + '-mybutton' : ''"></button>
Ham-Solo
<button [ngClass]="type === 'mybutton' ? namespace + '-mybutton' : ''"></button>
content_copy
<some-element [ngClass]="'first second'">...</some-element>
<some-element [ngClass]="['first', 'second']">...</some-element>
<some-element [ngClass]="{'first': true, 'second': true, 'third': false}">...</some-element>
<some-element [ngClass]="stringExp|arrayExp|objExp">...</some-element>
<some-element [ngClass]="{'class1 class2 class3' : true}">...</some-element>