Use buble and polyfills to support ES5 in bundles

build/es5.js

@@ -0,0 +1,6 @@
+require('core-js/fn/string/code-point-at')
+require('core-js/fn/string/from-code-point')
+
+const JSON5 = require('../lib')
+
+module.exports = JSON5

package.json

@@ -50,6 +50,7 @@
     "minimist": "^1.2.0"
   },
   "devDependencies": {
+    "core-js": "^2.5.7",
     "eslint": "^5.3.0",
     "eslint-config-standard": "^11.0.0",
     "eslint-plugin-import": "^2.14.0",
@@ -58,6 +59,7 @@
     "eslint-plugin-standard": "^3.1.0",
     "regenerate": "^1.4.0",
     "rollup": "^0.64.1",
+    "rollup-plugin-buble": "^0.19.2",
     "rollup-plugin-commonjs": "^9.1.5",
     "rollup-plugin-node-resolve": "^3.3.0",
     "rollup-plugin-terser": "^1.0.1",

rollup.config.js

@@ -1,12 +1,13 @@
 const resolve = require('rollup-plugin-node-resolve')
 const commonjs = require('rollup-plugin-commonjs')
+const buble = require('rollup-plugin-buble')
 const terser = require('rollup-plugin-terser').terser
 const pkg = require('./package.json')
 
 module.exports = [
     // Non-minified
     {
-        input: 'lib/index.js',
+        input: 'build/es5.js',
         output: {
             file: pkg.browser,
             format: 'umd',
@@ -15,11 +16,12 @@ module.exports = [
         plugins: [
             resolve(),
             commonjs(),
+            buble({transforms: {dangerousForOf: true}}),
         ],
     },
     // Minified
     {
-        input: 'lib/index.js',
+        input: 'build/es5.js',
         output: {
             file: pkg.browser.replace(/\.js$/, '.min.js'),
             format: 'umd',
@@ -28,6 +30,7 @@ module.exports = [
         plugins: [
             resolve(),
             commonjs(),
+            buble({transforms: {dangerousForOf: true}}),
             terser(),
         ],
     },