How to use the sprotty/lib/base.getBasicType function in sprotty

isChannelSchema(schema: SModelElementSchema): schema is ChannelSchema {
        return getBasicType(schema) === 'channel'
    }

isProcessorSchema(schema: SModelElementSchema): schema is ProcessorSchema {
        return getBasicType(schema) === 'processor'
    }

isCoreSchema(schema: SModelElementSchema): schema is CoreSchema {
        const basicType = getBasicType(schema)
        return basicType === 'core' || basicType === 'simplecore'
    }

isHtmlRootSchema(schema: SModelElementSchema): schema is HtmlRootSchema {
        return getBasicType(schema) === 'html'
    }

isCrossbarSchema(schema: SModelElementSchema): schema is CrossbarSchema {
        return getBasicType(schema) === 'crossbar'
    }

isPreRenderedSchema(schema: SModelElementSchema): schema is PreRenderedElementSchema {
        return getBasicType(schema) === 'pre-rendered'
    }
}