Use ES5 for Chart.bundle.js - fixes #563

.gitignore

@@ -3,7 +3,7 @@
 .bundle
 .config
 .yardoc
-Gemfile.lock
+*.lock
 InstalledFiles
 _yardoc
 coverage
@@ -15,3 +15,4 @@ spec/reports
 test/tmp
 test/version_tmp
 tmp
+node_modules

build/index.js

@@ -0,0 +1,4 @@
+import Chart from "chart.js/auto"
+import "chartjs-adapter-date-fns"
+
+export default Chart

build/package.json

@@ -0,0 +1,20 @@
+{
+  "name": "build",
+  "private": true,
+  "scripts": {
+    "build": "rollup -c"
+  },
+  "devDependencies": {
+    "@babel/cli": "^7.13.14",
+    "@babel/core": "^7.13.14",
+    "@babel/preset-env": "^7.13.12",
+    "@rollup/plugin-babel": "^5.3.0",
+    "@rollup/plugin-node-resolve": "^11.2.1",
+    "rollup": "^2.44.0"
+  },
+  "dependencies": {
+    "chart.js": "3.0.2",
+    "chartjs-adapter-date-fns": "2.0.0",
+    "date-fns": "2.19.0"
+  }
+}

build/rollup.config.js

@@ -0,0 +1,43 @@
+import babel from "@rollup/plugin-babel";
+import resolve from "@rollup/plugin-node-resolve";
+
+// use same banner as projects
+// 1. https://unpkg.com/[email protected]
+// 2. https://unpkg.com/[email protected]
+// 3. https://unpkg.com/[email protected] (no banner)
+const banner = `/*!
+ * Chart.js v3.0.2
+ * https://www.chartjs.org
+ * (c) 2021 Chart.js Contributors
+ * Released under the MIT License
+ *
+ * chartjs-adapter-date-fns v2.0.0
+ * https://www.chartjs.org
+ * (c) 2021 chartjs-adapter-date-fns Contributors
+ * Released under the MIT license
+ *
+ * date-fns v2.0.19
+ * https://date-fns.org
+ * (c) 2020 Sasha Koss and Lesha Koss
+ * Released under the MIT License
+ */
+`;
+
+export default [
+  {
+    input: "index.js",
+    output: {
+      name: "Chart",
+      file: "../vendor/assets/javascripts/Chart.bundle.js",
+      format: "umd",
+      banner: banner
+    },
+    plugins: [
+      resolve(),
+      babel({
+        babelHelpers: 'bundled',
+        presets: [['@babel/preset-env', {targets: 'defaults'}]]
+      })
+    ]
+  }
+];