Merge branch 'develop' into develop

Author: remcoder

src/indexers.ts

@@ -11,7 +11,7 @@ export class NonApplicableIndexer extends Error {}
  * @remarks
  * Indexers organize paths into different structures (layers, tools, etc.)
  */
-export class Indexer {
+export abstract class Indexer {
   /** The indexes being managed by this indexer */
   protected indexes: unknown;
 
@@ -28,10 +28,7 @@ export class Indexer {
    * @param path - Path to sort
    * @throws Error if not implemented in subclass
    */
-  sortIn(path: Path): void {
-    path;
-    throw new Error('Method not implemented.');
-  }
+  abstract sortIn(path: Path): void;
 }
 
 /**
@@ -162,7 +159,6 @@ export class ToolIndexer extends Indexer {
    */
   sortIn(path: Path): void {
     if (path.travelType === PathType.Extrusion) {
-      this.indexes;
       this.indexes[path.tool] = this.indexes[path.tool] || [];
       if (this.indexes[path.tool] === undefined) {
         this.indexes[path.tool] = [];