tslint complaining "statements must be filtered with an if statement" when using switch

Lets say I have the following method:

getErrorMessage(state: any, thingName?: string) {
    const thing: string = state.path || thingName;
    const messages: string[] = [];
    if (state.errors) {
        for (const errorName in state.errors) {
            switch (errorName) {
                case 'required':
                    messages.push(`You must enter a ${thing}`);
                    break;
                case 'minlength':
                    messages.push(`A ${thing} must be at least ${state.errors['minlength'].requiredLength}characters`);
                    break;
                case 'pattern':
                    messages.push(`The ${thing} contains illegal characters`);
                    break;
                case 'validateCardNumberWithAlgo':
                    messages.push(`Card doesnt pass algo`);
                    break;
            }
        }
    }
    return messages;
}

when I run

ng lint

I get the following error :

for (... in ...) statements must be filtered with an if statement

Having a look at similar question I don't think that answer would be applicable to my situation. After all switch statement sits in the category of if-else-if ladder.

tslint should consider switch statement as form of if statement but it doesn't?!