feat: drop IE support

BREAKING CHANGE: an es5-specific build is included in the dist
closes #83

CHANGELOG.md

@@ -12,6 +12,7 @@ Change Log
 - removed the built-in dependency `$options`. You can no longer do `.resolve({ foo: 'someValue' })`
 - removed the built-in dependency `$resolve`
 - `precedence` option lets you determine if a factory should overwrite an existing factory or not
+- Support for IE11 has been dropped by default. If you want a fully ES5-compatible version, you can import `jpex/dist/es5.js`
 
 #### Breaking Changes
 - if you attempt to resolve a global like `Window` without registering it first, rather than throw an error, you will now get the global variable
@@ -22,6 +23,7 @@ Change Log
 - `Lifecycle` is now a type rather than an enum
 - wrapping a name in `__` will no longer make it optional, you must explicitly pass the optional flag
 - `$options` and `$resolve` functionality have been removed
+- If you want to support IE11 you will need to import `jpex/dist/es5.js` or create an alias for it
 
 ### 3.5.1
 - building with webpack was giving warnings about `require` being used which meant it couldn't make optimizations

babel.config.js

@@ -6,8 +6,7 @@ module.exports = {
       {
         targets: {
           browsers: [
-            'last 2 versions',
-            'safari >= 7',
+            '> 2%',
           ],
         },
         modules: false,

rollup.config.es5.js

@@ -0,0 +1,45 @@
+import babel from 'rollup-plugin-babel';
+import localResolve from 'rollup-plugin-node-resolve';
+import path from 'path';
+
+export default {
+  input: 'src/index.ts',
+  output: [
+    {
+      file: 'dist/es5.js',
+      format: 'cjs',
+      exports: 'named',
+    },
+  ],
+  plugins: [
+    localResolve({
+      extensions: [ '.js', '.ts' ],
+    }),
+    babel({
+      exclude: 'node_modules/**',
+      extensions: [ '.js', '.ts' ],
+      presets: [
+        [
+          '@babel/preset-env',
+          {
+            targets: {
+              browsers: [
+                'last 2 versions',
+                'safari >= 7',
+              ],
+            },
+            modules: false,
+            useBuiltIns: false,
+            loose: true,
+          },
+        ],
+      ],
+      plugins: [
+        [
+          path.resolve('./babel-plugin.js'),
+          { publicPath: true },
+        ],
+      ],
+    }),
+  ],
+};

rollup.config.js

@@ -1,7 +1,9 @@
 import plugin from './rollup.config.plugin';
 import src from './rollup.config.src';
+import es5 from './rollup.config.es5';
 
 export default [
   plugin,
   src,
+  es5,
 ];