From bb3a8aafd9a9c590f26db9b6002c9154b1f4e30b Mon Sep 17 00:00:00 2001
From: Sebastian Silbermann <silbermann.sebastian@gmail.com>
Date: Wed, 15 Jan 2020 20:31:28 +0100
Subject: [PATCH] [types] Remove CoerceEmptyInterface (#19259)

---
 packages/material-ui-styles/src/withStyles/withStyles.d.ts | 6 ++----
 packages/material-ui-types/index.d.ts                      | 5 -----
 packages/material-ui/src/styles/withStyles.d.ts            | 7 ++-----
 3 files changed, 4 insertions(+), 14 deletions(-)

diff --git a/packages/material-ui-styles/src/withStyles/withStyles.d.ts b/packages/material-ui-styles/src/withStyles/withStyles.d.ts
index 1df7d1cfbf74fe..b3610bd3857969 100644
--- a/packages/material-ui-styles/src/withStyles/withStyles.d.ts
+++ b/packages/material-ui-styles/src/withStyles/withStyles.d.ts
@@ -1,5 +1,5 @@
 import * as React from 'react';
-import { PropInjector, CoerceEmptyInterface, IsEmptyInterface } from '@material-ui/types';
+import { PropInjector, IsEmptyInterface } from '@material-ui/types';
 import * as CSS from 'csstype';
 import * as JSS from 'jss';
 import { DefaultTheme } from '../defaultTheme';
@@ -83,9 +83,7 @@ export type ClassKeyOfStyles<StylesOrClassKey> = StylesOrClassKey extends string
 /**
  * infers the type of the props used in the styles
  */
-export type PropsOfStyles<StylesType> = StylesType extends Styles<any, infer Props>
-  ? CoerceEmptyInterface<Props>
-  : {};
+export type PropsOfStyles<StylesType> = StylesType extends Styles<any, infer Props> ? Props : {};
 
 /**
  * infers the type of the theme used in the styles
diff --git a/packages/material-ui-types/index.d.ts b/packages/material-ui-types/index.d.ts
index 1e0957d8ba1852..4dea0a07d4d61f 100644
--- a/packages/material-ui-types/index.d.ts
+++ b/packages/material-ui-types/index.d.ts
@@ -51,11 +51,6 @@ export type Overwrite<T, U> = Omit<T, keyof U> & U;
 // https://stackoverflow.com/a/49928360/3406963 without generic branch types
 export type IsAny<T> = 0 extends (1 & T) ? true : false;
 
-/**
- * Returns an empty object type if T is any, otherwise returns T
- */
-export type CoerceEmptyInterface<T> = IsAny<T> extends true ? {} : T;
-
 export type Or<A, B, C = false> = A extends true
   ? true
   : B extends true
diff --git a/packages/material-ui/src/styles/withStyles.d.ts b/packages/material-ui/src/styles/withStyles.d.ts
index 81784bd62a372e..af3dac2f00e73a 100644
--- a/packages/material-ui/src/styles/withStyles.d.ts
+++ b/packages/material-ui/src/styles/withStyles.d.ts
@@ -1,4 +1,4 @@
-import { PropInjector, CoerceEmptyInterface } from '@material-ui/types';
+import { PropInjector } from '@material-ui/types';
 import { Theme } from './createMuiTheme';
 import {
   CreateCSSProperties,
@@ -49,7 +49,4 @@ export default function withStyles<
 >(
   style: Styles<Theme, Props, ClassKey>,
   options?: Options,
-): PropInjector<
-  WithStyles<ClassKey, Options['withTheme']>,
-  StyledComponentProps<ClassKey> & CoerceEmptyInterface<Props>
->;
+): PropInjector<WithStyles<ClassKey, Options['withTheme']>, StyledComponentProps<ClassKey> & Props>;