From 63f2bc2021518178d8d020457142ac41d89cf4bb Mon Sep 17 00:00:00 2001
From: fisker Cheung <lionkay@gmail.com>
Date: Wed, 24 Sep 2025 04:20:44 +0800
Subject: [PATCH] Add `"sideEffects": false` to package.json (#17949)

---
 package.json                                | 3 ++-
 packages/plugin-hermes/package.json         | 3 ++-
 packages/plugin-oxc/package.json            | 3 ++-
 scripts/build/build-dependencies-license.js | 3 +--
 scripts/build/build-package-json.js         | 1 +
 5 files changed, 8 insertions(+), 5 deletions(-)

diff --git a/package.json b/package.json
index b00624c43..8e78da269 100644
--- a/package.json
+++ b/package.json
@@ -220,5 +220,6 @@
     "not op_mini all"
   ],
   "preferUnplugged": true,
-  "packageManager": "yarn@4.9.2"
+  "packageManager": "yarn@4.10.3",
+  "sideEffects": false
 }
diff --git a/packages/plugin-hermes/package.json b/packages/plugin-hermes/package.json
index 1d844f59a..3a9eb850b 100644
--- a/packages/plugin-hermes/package.json
+++ b/packages/plugin-hermes/package.json
@@ -18,5 +18,6 @@
   "funding": "https://github.com/prettier/prettier?sponsor=1",
   "homepage": "https://github.com/prettier/prettier/tree/main/packages/plugin-hermes",
   "author": "fisker Cheung <lionkay@gmail.com>",
-  "license": "MIT"
+  "license": "MIT",
+  "sideEffects": false
 }
diff --git a/packages/plugin-oxc/package.json b/packages/plugin-oxc/package.json
index 0ea20ac77..f4c6eeb03 100644
--- a/packages/plugin-oxc/package.json
+++ b/packages/plugin-oxc/package.json
@@ -18,5 +18,6 @@
   "funding": "https://github.com/prettier/prettier?sponsor=1",
   "homepage": "https://github.com/prettier/prettier/tree/main/packages/plugin-oxc",
   "author": "fisker Cheung <lionkay@gmail.com>",
-  "license": "MIT"
+  "license": "MIT",
+  "sideEffects": false
 }
diff --git a/scripts/build/build-dependencies-license.js b/scripts/build/build-dependencies-license.js
index 1a98edd2c..d75d8e589 100644
--- a/scripts/build/build-dependencies-license.js
+++ b/scripts/build/build-dependencies-license.js
@@ -134,8 +134,7 @@ async function buildDependenciesLicense({
     throw new Error(`${fileName} should be last file to build.`);
   }
 
-  const shouldBuildLicense =
-    !cliOptions.files && typeof cliOptions.minify !== "boolean";
+  const shouldBuildLicense = !cliOptions.files;
 
   if (!shouldBuildLicense) {
     return { skipped: true };
diff --git a/scripts/build/build-package-json.js b/scripts/build/build-package-json.js
index d8b6186e3..e9f7f7fe6 100644
--- a/scripts/build/build-package-json.js
+++ b/scripts/build/build-package-json.js
@@ -23,6 +23,7 @@ const keysToKeep = [
   "engines",
   "files",
   "preferUnplugged",
+  "sideEffects",
 ];
 
 const publishConfig = {