From f1da577ba325bc995d1ef4b4b1223abfa7b78877 Mon Sep 17 00:00:00 2001
From: Jake Archibald <jaffathecake@gmail.com>
Date: Thu, 12 Nov 2020 12:28:34 +0000
Subject: [PATCH] Avoid double builds

---
 rollup.config.js | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/rollup.config.js b/rollup.config.js
index 94e2f311..47d060ee 100644
--- a/rollup.config.js
+++ b/rollup.config.js
@@ -93,8 +93,15 @@ export default async function ({ watch }) {
       assetFileNames: staticPath,
       exports: 'named',
     },
-    // Don't watch the ts files. Instead we watch the output from the ts compiler.
-    watch: { clearScreen: false, exclude: ['**/*.ts', '**/*.tsx'] },
+    watch: {
+      clearScreen: false,
+      // Don't watch the ts files. Instead we watch the output from the ts compiler.
+      exclude: ['**/*.ts', '**/*.tsx'],
+      // Sometimes TypeScript does its thing a little slowly, which causes
+      // Rollup to build twice on each change. This delay seems to fix it,
+      // although we may need to change this number over time.
+      buildDelay: 250,
+    },
     preserveModules: true,
     plugins: [
       { resolveFileUrl, resolveImportMeta },