Update babel and webpack

Remove wildcard and require tests since the library has a default export and
that's what should be used for browser code.

Gruntfile.js

@@ -41,10 +41,16 @@ module.exports = function (grunt) {
     babel: {
       options: {
         sourceMaps: 'inline',
-        loose: ['es6.modules'],
-        auxiliaryCommentBefore: 'istanbul ignore next',
       },
       cjs: {
+        options: {
+          plugins: [
+            [
+              '@babel/plugin-transform-modules-commonjs',
+              { importInterop: 'none' },
+            ],
+          ],
+        },
         files: [
           {
             cwd: 'lib/',
@@ -57,11 +63,25 @@ module.exports = function (grunt) {
     },
     webpack: {
       options: {
+        mode: 'production',
+        optimization: { minimize: false },
+        target: 'web',
         context: __dirname,
+        module: {
+          rules: [
+            {
+              test: /\.js$/,
+              enforce: 'pre',
+              use: ['source-map-loader'],
+            },
+          ],
+        },
         output: {
-          path: 'dist/',
+          path: __dirname + '/dist/',
           library: 'Handlebars',
           libraryTarget: 'umd',
+          libraryExport: 'default',
+          globalObject: 'this',
         },
       },
       handlebars: {

lib/precompiler.js

@@ -1,12 +1,12 @@
 /* eslint-env node */
 /* eslint-disable no-console */
 import Async from 'neo-async';
-import fs from 'fs';
-import * as Handlebars from './handlebars';
+import * as fs from 'fs';
+import Handlebars from './handlebars';
 import { basename } from 'path';
 import { SourceMapConsumer, SourceNode } from 'source-map';
 
-module.exports.loadTemplates = function (opts, callback) {
+export function loadTemplates(opts, callback) {
   loadStrings(opts, function (err, strings) {
     if (err) {
       callback(err);
@@ -21,7 +21,7 @@ module.exports.loadTemplates = function (opts, callback) {
       });
     }
   });
-};
+}
 
 function loadStrings(opts, callback) {
   let strings = arrayCast(opts.string),
@@ -153,7 +153,7 @@ function loadFiles(opts, callback) {
   );
 }
 
-module.exports.cli = function (opts) {
+export function cli(opts) {
   if (opts.version) {
     console.log(Handlebars.VERSION);
     return;
@@ -300,7 +300,7 @@ module.exports.cli = function (opts) {
   } else {
     console.log(output);
   }
-};
+}
 
 function arrayCast(value) {
   value = value != null ? value : [];