Add box mark to auto

src/marks/auto.d.ts

@@ -92,7 +92,7 @@ export interface AutoOptions {
    * should usually suffice, and setting an explicit mark type may lead to a
    * nonsensical plot (especially if you change other options).
    */
-  mark?: "area" | "bar" | "dot" | "line" | "rule";
+  mark?: "area" | "bar" | "dot" | "line" | "rule" | "box" | "voronoi";
 }
 
 /**

src/marks/auto.js

@@ -11,6 +11,7 @@ import {frame} from "./frame.js";
 import {line, lineX, lineY} from "./line.js";
 import {rect, rectX, rectY} from "./rect.js";
 import {ruleX, ruleY} from "./rule.js";
+import {boxX, boxY} from "./box.js";
 
 export function autoSpec(data, options) {
   options = normalizeOptions(options);
@@ -141,6 +142,10 @@ export function autoSpec(data, options) {
           : cell;
       colorMode = "fill";
       break;
+    case "box":
+      markImpl = X && isOrdinal(X) ? boxY : boxX;
+      colorMode = "fill";
+      break;
     default:
       throw new Error(`invalid mark: ${mark}`);
   }
@@ -359,6 +364,8 @@ const impls = {
   rectX,
   rectY,
   cell,
+  boxX,
+  boxY,
   bin,
   binX,
   binY,