simpler

Author: Fil

src/interactions/brush.js

@@ -117,14 +117,11 @@ export class Brush extends Mark {
       return;
     }
     const {x1, x2, y1, y2, fx, fy} = value;
-    const node =
-      this._brushNodes.length === 1
-        ? this._brushNodes[0]
-        : this._brushNodes.find((n) => {
-            const d = n.__data__;
-            return d && (fx === undefined || d.x === fx) && (fy === undefined || d.y === fy);
-          });
-    if (!node) throw new Error("No brush node found for the specified facet");
+    const node = this._brushNodes.find((n) => {
+      const d = n.__data__;
+      return (fx === undefined || d?.x === fx) && (fy === undefined || d?.y === fy);
+    });
+    if (!node) throw new Error(fx === undefined && fy === undefined ? "No brush node found" : "No brush node found for the specified facet");
     const px1 = this._applyX(x1);
     const px2 = this._applyX(x2);
     const py1 = this._applyY(y1);