From 9d6698167e4008b0c2ef19e65fbf370258826a4e Mon Sep 17 00:00:00 2001
From: xiejay97 <xiejay97@gmail.com>
Date: Fri, 22 Apr 2022 15:10:18 +0800
Subject: [PATCH] fix(web): optimized rollup output logic ISSUES CLOSED: #8475
 ISSUES CLOSED: #8505

---
 .../web/src/executors/rollup/rollup.impl.ts   | 23 ++++++++++++++++---
 1 file changed, 20 insertions(+), 3 deletions(-)

diff --git a/packages/web/src/executors/rollup/rollup.impl.ts b/packages/web/src/executors/rollup/rollup.impl.ts
index cc98fb42e1811..ab1fa72945098 100644
--- a/packages/web/src/executors/rollup/rollup.impl.ts
+++ b/packages/web/src/executors/rollup/rollup.impl.ts
@@ -305,9 +305,26 @@ function updatePackageJson(
     /\.[jt]sx?$/,
     '.d.ts'
   );
-  packageJson.main = entryFileTmpl.replace('<%= extension %>', 'umd');
-  packageJson.module = entryFileTmpl.replace('<%= extension %>', 'esm');
-  packageJson.typings = `./${typingsFile}`;
+
+  // Update main field
+  if (!packageJson.main) {
+    if (options.format.includes('cjs')) {
+      packageJson.main = entryFileTmpl.replace('<%= extension %>', 'cjs');
+    } else if (options.format.includes('umd')) {
+      packageJson.main = entryFileTmpl.replace('<%= extension %>', 'umd');
+    }
+  }
+
+  // Update module field
+  if (!packageJson.module && options.format.includes('esm')) {
+    packageJson.module = entryFileTmpl.replace('<%= extension %>', 'esm');
+  }
+
+  // Update typings field
+  if (!packageJson.typings) {
+    packageJson.typings = `./${typingsFile}`;
+  }
+
   writeJsonFile(`${options.outputPath}/package.json`, packageJson);
 
   if (