From 77b051fbac5a4d46933e4f069317949a07f5d5c3 Mon Sep 17 00:00:00 2001
From: Alan Agius <alanagius@google.com>
Date: Tue, 7 May 2024 07:37:15 +0000
Subject: [PATCH] build: switch from rollup and terser to esbuild for creating
 contract bundle

This commit implements the replacement of rollup and terser with esbuild for generating the contract_bundle binary. The transition is facilitated by optimizations aimed at reducing the bundle size.
---
 packages/core/BUILD.bazel                     |  2 +-
 .../primitives/event-dispatch/BUILD.bazel     | 25 +++++++++----------
 .../event-dispatch/terser.config.json         | 20 ---------------
 3 files changed, 13 insertions(+), 34 deletions(-)
 delete mode 100644 packages/core/primitives/event-dispatch/terser.config.json

diff --git a/packages/core/BUILD.bazel b/packages/core/BUILD.bazel
index b0773b32d031c..5ab8f6df2e30e 100644
--- a/packages/core/BUILD.bazel
+++ b/packages/core/BUILD.bazel
@@ -148,5 +148,5 @@ genrule(
     name = "event_dispatch_contract_binary",
     srcs = ["//packages/core/primitives/event-dispatch:contract_bundle_min"],
     outs = ["event-dispatch-contract.min.js"],
-    cmd = "cat $< >> $@",
+    cmd = "cp $< $@",
 )
diff --git a/packages/core/primitives/event-dispatch/BUILD.bazel b/packages/core/primitives/event-dispatch/BUILD.bazel
index 7144eff9951d6..238067290fb70 100644
--- a/packages/core/primitives/event-dispatch/BUILD.bazel
+++ b/packages/core/primitives/event-dispatch/BUILD.bazel
@@ -1,6 +1,4 @@
-load("//tools:defaults.bzl", "ts_library", "tsec_test")
-load("@npm//@bazel/rollup:index.bzl", "rollup_bundle")
-load("@npm//@bazel/terser:index.bzl", "terser_minified")
+load("//tools:defaults.bzl", "esbuild", "ts_library", "tsec_test")
 
 package(default_visibility = ["//visibility:public"])
 
@@ -29,17 +27,18 @@ filegroup(
     visibility = ["//visibility:public"],
 )
 
-rollup_bundle(
-    name = "contract_bundle",
-    args = ["--no-sourcemap"],
+esbuild(
+    name = "contract_bundle_min",
+    args = {
+        "sourcemap": False,
+        "resolveExtensions": [
+            ".mjs",
+        ],
+        "legalComments": "none",
+    },
     entry_point = ":contract_binary.ts",
     format = "iife",
+    minify = True,
+    sourcemap = "inline",
     deps = [":event-dispatch"],
 )
-
-terser_minified(
-    name = "contract_bundle_min",
-    src = ":contract_bundle",
-    config_file = ":terser.config.json",
-    sourcemap = False,
-)
diff --git a/packages/core/primitives/event-dispatch/terser.config.json b/packages/core/primitives/event-dispatch/terser.config.json
deleted file mode 100644
index c722de7ad8e0f..0000000000000
--- a/packages/core/primitives/event-dispatch/terser.config.json
+++ /dev/null
@@ -1,20 +0,0 @@
-{
-    "ecma": "es2020",
-    "compress": {
-      "toplevel": true,
-      "passes": 2,
-      "pure_getters": true
-    },
-    "mangle": {
-      "toplevel": true,
-      "properties": false,
-      "keep_classnames": false,
-      "keep_fnames": false
-    },
-    "format": {
-      "ecma": "es2020",
-      "ascii_only": true,
-      "wrap_func_args": false,
-      "comments": false
-    }
-  }
\ No newline at end of file