20180115

• :class="['mint-button--' + type, 'mint-button--' + size, { 'is-disabled': disabled, 'is-plain': plain }]"

• <some-element [ngClass]="stringExp|arrayExp|objExp">...

• <slot></slot>

• <ng-content></ng-content>

https://github.com/Microsoft/TypeScript/wiki/FAQ#why-am-i-getting-the-error-ts5055-cannot-write-file-xxxjs-because-it-would-overwrite-input-file-when-using-javascript-files