ngClass in host property of component decorator does not work

ngClass is a directive and can’t be used in host bindings. Host bindings only supports

• property '[propName]':'expr'
• attribute '[attr.attrName]':'expr'
• event (event)="someFunction(event);otherExpr",
• style [style.width]="booleanExpr"
• class [class.className]="booleanExpr" binding.
• class [class]="expr" where expr is a string with space separated classes