complete styling

lib/Node.ts

@@ -27,10 +27,19 @@ export class Node extends Element {
 
   // eslint-disable-next-line @typescript-eslint/naming-convention
   public toString (): string {
+    const attributes = [];
+    if (this.style)
+      attributes.push ({ name: 'style', value: this.style.toString () });
+    if (this.color)
+      attributes.push ({ name: 'color', value: this.color.toString () });
+
+    const attrs = attributes.map ((v) => `${v.name}="${v.value}"`)
+      .join (',');
+
     if (this.is_table || typeof this.label !== 'undefined') {
       return `${this.full_name} [label=<${this.is_table
         ? this.serialized_table
-        : this.label}>]`;
+        : this.label}>${attributes.length > 0 ? `,${attrs}` : ''}]`;
     }
     return `${this.full_name}`;
   }

lib/Styles.ts

@@ -16,7 +16,8 @@ enum NodeStyles {
   diagonals='diagonals',
   filled='filled',
   striped='striped',
-  wedged='wedged'
+  wedged='wedged',
+  invisible='invis'
 }
 
 enum GraphStyles {

test/Node.ts

@@ -22,7 +22,7 @@ test ('serialize simple', (t) => {
 test ('serialize table', (t) => {
   const g = new Node ('foo', 'bar', 'baz');
   g.color = Color.green;
-  g.style = NodeStyles.dashed;
+  g.style = NodeStyles.invisible;
 
   g.table_contents = [
     [