Method addFeature

www/js/_hyperscript.js:1588–1592

(keyword, definition)

      }
    }
    addFeature(keyword, definition) {
      var featureGrammarType = keyword + "Feature";
      this.#grammar[featureGrammarType] = definition;
      this.#features[keyword] = definition;
    }
    /**
     * Register a parse element class based on its static metadata.
     * Commands need `static keyword`, expressions need `static grammarName`.