Method addFeatures

www/js/_hyperscript.esm.js:1575–1585

(...featureClasses)

    }
  }
  addFeatures(...featureClasses) {
    for (const FeatureClass of featureClasses) {
      if (!FeatureClass.keyword) {
        throw new Error(`Feature class ${FeatureClass.name} must have a static 'keyword' property`);
      }
      if (!FeatureClass.parse) {
        throw new Error(`Feature class ${FeatureClass.name} must have a static 'parse' method`);
      }
      this.addFeature(FeatureClass.keyword, FeatureClass.parse);
    }
  }
  addFeature(keyword, definition) {
    var featureGrammarType = keyword + "Feature";
    this.#grammar[featureGrammarType] = definition;