scoped-class-helper This rule checks if scoped-class helper has one positional param of type StringLiteral. The following example shows the correct use of the helper: <SomeComponent @class={{scoped-class 'first-class second-class'}} /> Examples This rule forbids the following: Wrong number of positional params <SomeComponent @class={{scoped-class}} /> <SomeComponent @class={{scoped-class 'first-class' 'second-param'}} /> Dynamic properties <SomeComponet @class={{scoped-class this.myClass}} />