feat(core): Add build target for jsaction contract binary. (#55319)

Right now this binary sits at 9.5kb. Additional changes to the library will
be done to reduce the binary size, such as converting event_type from
an enum to an object, and other code size reductions.

PR Close #55319

packages/core/primitives/event-dispatch/BUILD.bazel

@@ -1,4 +1,6 @@
 load("//tools:defaults.bzl", "ts_library", "tsec_test")
+load("@npm//@bazel/rollup:index.bzl", "rollup_bundle")
+load("@npm//@bazel/terser:index.bzl", "terser_minified")
 
 package(default_visibility = ["//visibility:public"])
 
@@ -26,3 +28,16 @@ filegroup(
     ]),
     visibility = ["//visibility:public"],
 )
+
+rollup_bundle(
+    name = "bundled_contract_binary_tmp",
+    entry_point = ":contract_binary.ts",
+    format = "esm",
+    deps = [":event-dispatch"],
+)
+
+terser_minified(
+    name = "bundle",
+    src = ":bundled_contract_binary_tmp",
+    config_file = ":terser.config.json",
+)

packages/core/primitives/event-dispatch/contract_binary.ts

@@ -0,0 +1,12 @@
+/**
+ * @license
+ * Copyright Google LLC All Rights Reserved.
+ *
+ * Use of this source code is governed by an MIT-style license that can be
+ * found in the LICENSE file at https://angular.io/license
+ */
+
+
+import {bootstrapEventContract} from './src/register_events';
+
+(window as any)['__jsaction_bootstrap'] = bootstrapEventContract;

packages/core/primitives/event-dispatch/terser.config.json

@@ -0,0 +1,20 @@
+{
+    "ecma": "es2020",
+    "compress": {
+      "toplevel": true,
+      "passes": 2,
+      "pure_getters": true
+    },
+    "mangle": {
+      "toplevel": true,
+      "properties": true,
+      "keep_classnames": false,
+      "keep_fnames": false
+    },
+    "format": {
+      "ecma": "es2020",
+      "ascii_only": true,
+      "wrap_func_args": false,
+      "comments": false
+    }
+  }