diff --git a/packages/mermaid/src/diagrams/pie/pieRenderer.js b/packages/mermaid/src/diagrams/pie/pieRenderer.js
index 721c61e521b..649715d1b9b 100644
--- a/packages/mermaid/src/diagrams/pie/pieRenderer.js
+++ b/packages/mermaid/src/diagrams/pie/pieRenderer.js
@@ -1,17 +1,12 @@
 /** Created by AshishJ on 11-09-2019. */
 import { select, scaleOrdinal, pie as d3pie, arc } from 'd3';
-import { log } from '../../logger';
-import { configureSvgSize } from '../../setupGraphViewbox';
-import * as configApi from '../../config';
-import { parseFontSize } from '../../utils';
+import { log } from '../../logger.js';
+import { configureSvgSize } from '../../setupGraphViewbox.js';
+import * as configApi from '../../config.js';
+import { parseFontSize } from '../../utils.js';
+import { getTextWidth } from '../../rendering-util/getTextWidth';
 
 let conf = configApi.getConfig();
-// https://stackoverflow.com/a/35373030/3469145
-const getTextWidth = (function () {
-  const canvas = document.createElement('canvas')
-  const context = canvas.getContext('2d')
-  return text => context.measureText(text).width * window.devicePixelRatio
-})();
 
 /**
  * Draws a Pie Chart with the data given in text.
@@ -79,15 +74,14 @@ export const draw = (txt, id, _version, diagObj) => {
       sum += data[key];
     });
 
-    const legendShowData = diagObj.db.getShowData() || conf.showData || conf.pie.showData;
+    const legendShowData = diagObj.db.getShowData() || conf.showData || conf.pie.showData || false;
     const legendTexts = Object.keys(data).map(key => {
       if (!legendShowData) {
         return key;
       }
-      return key + ' [' + data[key] + ']';
+      return `${key} [${data[key]}]`;
     })
-    const legendTextWidths = legendTexts.map(v => getTextWidth(v)).sort((a, b) => a - b);
-    const longestTextWidth = parseInt(legendTextWidths.pop());
+    const longestTextWidth = Math.max(legendTexts.map(v => getTextWidth(v)));
     const newWidth = width + margin + legendRectSize + legendSpacing + longestTextWidth;
     elem.setAttribute("viewBox", "0 0 " + newWidth + " " + height);
 
diff --git a/packages/mermaid/src/rendering-util/getTextWidth.ts b/packages/mermaid/src/rendering-util/getTextWidth.ts
new file mode 100644
index 00000000000..da44f2a3fb3
--- /dev/null
+++ b/packages/mermaid/src/rendering-util/getTextWidth.ts
@@ -0,0 +1,7 @@
+// https://stackoverflow.com/a/35373030/3469145
+const canvas = document.createElement('canvas');
+const context = canvas.getContext('2d') as CanvasRenderingContext2D;
+
+const getTextWidth = (text: string) => context.measureText(text).width * window.devicePixelRatio;
+
+export { getTextWidth };