Bar graph added.

node_modules/canvas/browser.js

@@ -0,0 +1,35 @@
+/* globals document, ImageData */
+
+const parseFont = require('./lib/parse-font')
+
+exports.parseFont = parseFont
+
+exports.createCanvas = function (width, height) {
+  return Object.assign(document.createElement('canvas'), { width: width, height: height })
+}
+
+exports.createImageData = function (array, width, height) {
+  // Browser implementation of ImageData looks at the number of arguments passed
+  switch (arguments.length) {
+    case 0: return new ImageData()
+    case 1: return new ImageData(array)
+    case 2: return new ImageData(array, width)
+    default: return new ImageData(array, width, height)
+  }
+}
+
+exports.loadImage = function (src, options) {
+  return new Promise(function (resolve, reject) {
+    const image = Object.assign(document.createElement('img'), options)
+
+    function cleanup () {
+      image.onload = null
+      image.onerror = null
+    }
+
+    image.onload = function () { cleanup(); resolve(image) }
+    image.onerror = function () { cleanup(); reject(new Error('Failed to load the image "' + src + '"')) }
+
+    image.src = src
+  })
+}