cleaned up viewers

build_vtk_bundle/node_modules/d3-array/src/scan.js

@@ -0,0 +1,6 @@
+import leastIndex from "./leastIndex.js";
+
+export default function scan(values, compare) {
+  const index = leastIndex(values, compare);
+  return index < 0 ? undefined : index;
+}