diff --git a/src/config/Options/data/axis.ts b/src/config/Options/data/axis.ts
index b6179f08e..343bd3bea 100644
--- a/src/config/Options/data/axis.ts
+++ b/src/config/Options/data/axis.ts
@@ -6,20 +6,6 @@
  * Axis based chart data config options
  */
 export default {
-	/**
-	 * Specify the key of x values in the data.<br><br>
-	 * We can show the data with non-index x values by this option. This option is required when the type of x axis is timeseries. If this option is set on category axis, the values of the data on the key will be used for category names.
-	 * @name data․x
-	 * @memberof Options
-	 * @type {string}
-	 * @default undefined
-	 * @example
-	 * data: {
-	 *   x: "date"
-	 * }
-	 */
-	data_x: <string|undefined> undefined,
-
 	/**
 	 * Specify the keys of the x values for each data.<br><br>
 	 * This option can be used if we want to show the data that has different x values.
diff --git a/src/config/Options/data/data.ts b/src/config/Options/data/data.ts
index 02286fc7f..0c032f455 100644
--- a/src/config/Options/data/data.ts
+++ b/src/config/Options/data/data.ts
@@ -8,6 +8,20 @@ import {ChartTypes} from "../../../../types/types";
  * data config options
  */
 export default {
+	/**
+	 * Specify the key of x values in the data.<br><br>
+	 * We can show the data with non-index x values by this option. This option is required when the type of x axis is timeseries. If this option is set on category axis, the values of the data on the key will be used for category names.
+	 * @name data․x
+	 * @memberof Options
+	 * @type {string}
+	 * @default undefined
+	 * @example
+	 * data: {
+	 *   x: "date"
+	 * }
+	 */
+	data_x: <string|undefined> undefined,
+
 	/**
 	 * Converts data id value
 	 * @name data․idConverter
diff --git a/test/esm/radar-spec.ts b/test/esm/radar-spec.ts
new file mode 100644
index 000000000..c65713e00
--- /dev/null
+++ b/test/esm/radar-spec.ts
@@ -0,0 +1,52 @@
+/**
+ * Copyright (c) 2017 ~ present NAVER Corp.
+ * billboard.js project is licensed under the MIT license
+ */
+/* eslint-disable */
+/* global describe, beforeEach, it, expect */
+import {expect} from "chai";
+import bb, {radar} from "../../src/index.esm";
+import CLASS from "../../src/config/classes";
+
+describe("ESM radar", function() {
+    let chart;
+
+    const args: any = {
+        data: {
+            x: "x",
+            columns: [
+                ["x", "Data A", "Data B", "Data C", "Data D", "Data E"],
+                ["data1", 330, 350, 200, 380, 150],
+                ["data2", 130, 100, 30, 200, 80],
+                ["data3", 230, 153, 85, 300, 250]
+            ],
+            type: radar(),
+            labels: true
+        },
+        radar: {
+            axis: {
+                max: 400
+            },
+            level: {
+                depth: 4
+            },
+            direction: {
+                clockwise: true
+            }
+        }
+    };
+    
+	beforeEach(() => {
+		chart = bb.generate(args);
+	});
+
+    it("should correctly render radar chart", () => {
+        const categories = chart.internal.config.axis_x_categories;
+
+        expect(categories.length === args.data.columns[0].length - 1).to.be.true;
+
+        chart.$.main.selectAll(`.${CLASS.axis} text`).each(function(d, i) {
+            expect(this.textContent).to.be.equal(categories[i]);
+        });
+    });
+});
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