From f4a56ed21a17457dbfc6ba4da3f539ace4bfb9af Mon Sep 17 00:00:00 2001
From: EGOIST <hi@egoist.sh>
Date: Thu, 5 May 2022 21:46:00 +0800
Subject: [PATCH] fix: define a build-time constant called `TSUP_FORMAT`

---
 src/esbuild/index.ts | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/esbuild/index.ts b/src/esbuild/index.ts
index 20ee6000..2d3550b8 100644
--- a/src/esbuild/index.ts
+++ b/src/esbuild/index.ts
@@ -174,6 +174,7 @@ export async function runEsbuild(
           : ['browser', 'module', 'main'],
       plugins: esbuildPlugins.filter(truthy),
       define: {
+        TSUP_FORMAT: JSON.stringify(format),
         ...(format === 'cjs' && injectShims
           ? {
               'import.meta.url': 'importMetaUrl',