Add --out-file option

src/Asset.js

@@ -171,11 +171,23 @@ class Asset {
 
   generateBundleName() {
     // Resolve the main file of the package.json
-    let main =
+    const main =
       this.package && this.package.main
         ? path.resolve(path.dirname(this.package.pkgfile), this.package.main)
         : null;
-    let ext = '.' + this.type;
+    const ext = '.' + this.type;
+
+    const isEntryPoint = this.name === this.options.mainFile;
+
+    // If this is the entry point of the root bundle, use outFile filename if provided
+    if (isEntryPoint && this.options.outFile) {
+      return (
+        path.basename(
+          this.options.outFile,
+          path.extname(this.options.outFile)
+        ) + ext
+      );
+    }
 
     // If this asset is main file of the package, use the sanitized package name
     if (this.name === main) {
@@ -186,7 +198,7 @@ class Asset {
     }
 
     // If this is the entry point of the root bundle, use the original filename
-    if (this.name === this.options.mainFile) {
+    if (isEntryPoint) {
       return path.basename(this.name, path.extname(this.name)) + ext;
     }
 

src/Bundler.js

@@ -70,6 +70,7 @@ class Bundler extends EventEmitter {
     const target = options.target || 'browser';
     return {
       outDir: Path.resolve(options.outDir || 'dist'),
+      outFile: options.outFile || '',
       publicURL: publicURL,
       watch: watch,
       cache: typeof options.cache === 'boolean' ? options.cache : true,

src/cli.js

@@ -23,11 +23,15 @@ program
     'set the hostname of HMR websockets, defaults to location.hostname of current window'
   )
   .option('--https', 'serves files over HTTPS')
-  .option('-o, --open', 'automatically open in default browser')
+  .option('--open', 'automatically open in default browser')
   .option(
     '-d, --out-dir <path>',
     'set the output directory. defaults to "dist"'
   )
+  .option(
+    '-o, --out-file <filename>',
+    'set the output filename for the application entry point.'
+  )
   .option(
     '--public-url <url>',
     'set the public URL to serve on. defaults to the same as the --out-dir option'
@@ -50,6 +54,10 @@ program
     '-d, --out-dir <path>',
     'set the output directory. defaults to "dist"'
   )
+  .option(
+    '-o, --out-file <filename>',
+    'set the output filename for the application entry point.'
+  )
   .option(
     '--public-url <url>',
     'set the public URL to serve on. defaults to the same as the --out-dir option'
@@ -71,6 +79,10 @@ program
     '-d, --out-dir <path>',
     'set the output directory. defaults to "dist"'
   )
+  .option(
+    '-o, --out-file <filename>',
+    'set the output filename for the application entry point.'
+  )
   .option(
     '--public-url <url>',
     'set the public URL to serve on. defaults to the same as the --out-dir option'

test/asset.js

@@ -1,5 +1,7 @@
 const assert = require('assert');
+const fs = require('fs');
 const Asset = require('../src/Asset');
+const {bundle} = require('./utils');
 
 describe('Asset', () => {
   it('should include default implementations', async () => {
@@ -19,6 +21,15 @@ describe('Asset', () => {
     assert.equal(a.generateErrorMessage(err), err);
   });
 
+  it('should support overriding the filename of the root bundle', async function() {
+    const outFile = 'custom-out-file.html';
+    await bundle(__dirname + '/integration/html/index.html', {
+      outFile
+    });
+
+    assert(fs.existsSync(__dirname, `/dist/${outFile}`));
+  });
+
   describe('addURLDependency', () => {
     const bundleName = 'xyz';
     const options = {