Move rollup configuration to front_end/rollup.config.js

This makes it easier to change the rollup configuration and allows
us to introduce the terser minification plugin.

R=jacktfranklin@chromium.org,aerotwist@chromium.org

Bug: 1084578
Change-Id: Ie9c3447913a9d6ca59905267472a8bad328642b2
Reviewed-on: https://chromium-review.googlesource.com/c/devtools/devtools-frontend/+/2208134
Reviewed-by: Jack Franklin <jacktfranklin@chromium.org>
Reviewed-by: Paul Lewis <aerotwist@chromium.org>
Commit-Queue: Tim van der Lippe <tvanderlippe@chromium.org>

front_end/rollup.config.js

@@ -0,0 +1,20 @@
+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import * as fs from 'fs';
+import * as path from 'path';
+
+const external = fs.readdirSync(__dirname, {withFileTypes: true})
+                     .filter(dirent => dirent.isDirectory())
+                     .map(dirent => path.join(__dirname, dirent.name, dirent.name + '.js'));
+
+// eslint-disable-next-line import/no-default-export
+export default {
+  external,
+  treeshake: false,
+  context: 'self',
+  output: {
+    format: 'esm',
+  },
+};

scripts/build/build_release_applications.py

@@ -40,17 +40,6 @@ finally:
 
 FRONT_END_DIRECTORY = path.join(os.path.dirname(path.abspath(__file__)), '..', '..', 'front_end')
 
-MODULE_LIST = [
-    path.join(FRONT_END_DIRECTORY, subfolder, subfolder + '.js')
-    for subfolder in os.listdir(FRONT_END_DIRECTORY)
-    if path.isdir(os.path.join(FRONT_END_DIRECTORY, subfolder))
-]
-
-ROLLUP_ARGS = [
-    '--no-treeshake', '--format', 'esm', '--context', 'self', '--external',
-    ','.join([path.abspath(module) for module in MODULE_LIST])
-]
-
 
 def main(argv):
     try:
@@ -221,10 +210,14 @@ class ReleaseBuilder(object):
         js_entrypoint = join(self.application_dir, module_name, module_name + '.js')
         out = ''
         if self.use_rollup:
-            rollup_process = subprocess.Popen(
-                [devtools_paths.node_path(), devtools_paths.rollup_path()] + ROLLUP_ARGS + ['--input', js_entrypoint],
-                stdout=subprocess.PIPE,
-                stderr=subprocess.PIPE)
+            rollup_process = subprocess.Popen([
+                devtools_paths.node_path(),
+                devtools_paths.rollup_path(), '--config',
+                join(FRONT_END_DIRECTORY, 'rollup.config.js'), '--input',
+                js_entrypoint
+            ],
+                                              stdout=subprocess.PIPE,
+                                              stderr=subprocess.PIPE)
             out, error = rollup_process.communicate()
         else:
             out = read_file(js_entrypoint)