From 0a2732a2b0be45121b772f8de5e271439e3bd888 Mon Sep 17 00:00:00 2001
From: "Lyu, Wei-Da" <36730922+jasonlyu123@users.noreply.github.com>
Date: Thu, 6 Jul 2023 17:38:24 +0800
Subject: [PATCH] fix: generate type definition with nullable types (#8924)

This results in `undefined` and `null` being added explicitly in places which is crucial in some situations
---
 .changeset/funny-bags-occur.md          | 5 +++++
 packages/svelte/scripts/generate-dts.js | 3 +++
 2 files changed, 8 insertions(+)
 create mode 100644 .changeset/funny-bags-occur.md

diff --git a/.changeset/funny-bags-occur.md b/.changeset/funny-bags-occur.md
new file mode 100644
index 000000000000..81f89bcd0f5d
--- /dev/null
+++ b/.changeset/funny-bags-occur.md
@@ -0,0 +1,5 @@
+---
+'svelte': patch
+---
+
+fix: generate type definition with nullable types
diff --git a/packages/svelte/scripts/generate-dts.js b/packages/svelte/scripts/generate-dts.js
index fe4b70e09a61..0ecf7127dfd2 100644
--- a/packages/svelte/scripts/generate-dts.js
+++ b/packages/svelte/scripts/generate-dts.js
@@ -16,6 +16,9 @@ fs.writeFileSync('./types/compiler/interfaces.d.ts', `import '../index.js';`);
 
 await createBundle({
 	output: 'types/index.d.ts',
+	compilerOptions: {
+		strict: true
+	},
 	modules: {
 		svelte: 'src/runtime/public.d.ts',
 		'svelte/compiler': 'src/compiler/public.d.ts',