From a8140efe58703ed77c6ebd4edf376f2134350989 Mon Sep 17 00:00:00 2001
From: Fathy Boundjadj <fathy.boundjadj@gmail.com>
Date: Fri, 1 Sep 2017 23:40:26 +0200
Subject: [PATCH] [TypeScript] Make createMuiTheme's ThemeOptions recursively
 partial (#7993)

---
 src/styles/createMuiTheme.d.ts  | 4 +++-
 test/typescript/styles.spec.tsx | 6 ++++++
 2 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/src/styles/createMuiTheme.d.ts b/src/styles/createMuiTheme.d.ts
index c91e70da63ae7f..ba939af4b35cbf 100644
--- a/src/styles/createMuiTheme.d.ts
+++ b/src/styles/createMuiTheme.d.ts
@@ -24,5 +24,7 @@ export type Theme<T = {}> = {
   T;
 
 export default function createMuiTheme<T = {}>(
-  options?: Partial<ThemeOptions> & T
+  options?: {
+    [K in keyof ThemeOptions]?: Partial<ThemeOptions[K]>
+  } & T
 ): Theme<T>;
diff --git a/test/typescript/styles.spec.tsx b/test/typescript/styles.spec.tsx
index aa4924b617b5ea..bdf290dd00bf10 100644
--- a/test/typescript/styles.spec.tsx
+++ b/test/typescript/styles.spec.tsx
@@ -70,6 +70,12 @@ const theme = createMuiTheme({
   },
 });
 
+const customTheme = createMuiTheme({
+  palette: {
+    type: 'dark'
+  }
+});
+
 function OverridesTheme() {
   return (
     <MuiThemeProvider theme={theme}>