All files / src/custom-element/mixins StylesMetadataInitializerMixin.ts

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import { CustomElementMetadata } from "../interfaces";
 
const StylesMetadataInitializerMixin = Base =>
 
    class StylesMetadataInitializer extends Base {
 
        /**
         * The styles to track in the class
         */
        static styles: () => string | string[];
 
        protected static initializeStyles(metadata: CustomElementMetadata): void {
 
            const {
                styles
            } = this;
 
            if (styles === undefined) {
 
                return;
            }
 
            metadata.styles = Array.isArray(styles) ?
                [...metadata.styles, ...styles] :
                [...metadata.styles, styles];
 
            // Do not inherit the styles of the base custom element by default             
        }
    }
 
export default StylesMetadataInitializerMixin;