[styles] Overload function signature instead of conditional

packages/material-ui-styles/src/makeStyles/makeStyles.d.ts

@@ -1,47 +1,27 @@
 import {
-  ClassKeyOfStyles,
   ClassNameMap,
   PropsOfStyles,
   Styles,
   WithStylesOptions,
 } from '@material-ui/styles/withStyles';
-import { Omit, IsAny, Or, IsEmptyInterface } from '@material-ui/types';
+import { Omit } from '@material-ui/types';
 import { DefaultTheme } from '../defaultTheme';
 
 /**
- * @internal
- *
- * If a style callback is given with `theme => stylesOfTheme` then typescript
- * infers `Props` to `any`.
- * If a static object is given with { ...members } then typescript infers `Props`
- * to `{}`.
- *
- * So we require no props in `useStyles` if `Props` in `makeStyles(styles)` is
- * inferred to either `any` or `{}`
+ * `makeStyles` where the passed `styles` do not depend on props
  */
-export type StylesRequireProps<S> = Or<
-  IsAny<PropsOfStyles<S>>,
-  IsEmptyInterface<PropsOfStyles<S>>
-> extends true
-  ? false
-  : true;
-
+export default function makeStyles<Theme = DefaultTheme, ClassKey extends string = string>(
+  style: Styles<Theme, {}, ClassKey>,
+  options?: Omit<WithStylesOptions<Theme>, 'withTheme'>,
+): (props?: any) => ClassNameMap<ClassKey>;
 /**
- * @internal
- *
- * `Props` are `any` either by explicit annotation or if there are no callbacks
- * from which the typechecker could infer a type so it falls back to `any`.
- * See the test cases for examples and implications of explicit `any` annotation
+ * `makeStyles` where the passed `styles` do depend on props
  */
-export type StylesHook<S extends Styles<any, any>> = StylesRequireProps<S> extends false
-  ? (props?: any) => ClassNameMap<ClassKeyOfStyles<S>>
-  : (props: PropsOfStyles<S>) => ClassNameMap<ClassKeyOfStyles<S>>;
-
 export default function makeStyles<
   Theme = DefaultTheme,
   Props extends {} = {},
   ClassKey extends string = string
 >(
   styles: Styles<Theme, Props, ClassKey>,
   options?: Omit<WithStylesOptions<Theme>, 'withTheme'>,
-): StylesHook<Styles<Theme, Props, ClassKey>>;
+): (props: Props) => ClassNameMap<ClassKey>;

packages/material-ui-styles/test/index.spec.tsx → packages/material-ui-styles/src/makeStyles/makeStyles.spec.tsx

@@ -2,7 +2,6 @@ import * as React from 'react';
 import { Theme } from '@material-ui/core';
 import { AppBarProps } from '@material-ui/core/AppBar';
 import { createStyles, makeStyles } from '@material-ui/styles';
-import styled, { StyledProps } from '@material-ui/styles/styled';
 
 // makeStyles
 {
@@ -136,50 +135,3 @@ import styled, { StyledProps } from '@material-ui/styles/styled';
     classes.other;
   }
 }
-
-// styled
-{
-  const StyledButton = styled('button')({
-    background: 'linear-gradient(45deg, #FE6B8B 30%, #FF8E53 90%)',
-    borderRadius: 3,
-    border: 0,
-    color: 'white',
-    height: 48,
-    padding: '0 30px',
-    boxShadow: '0 3px 5px 2px rgba(255, 105, 135, .3)',
-  });
-  const renderedStyledButton = <StyledButton classes={{ root: 'additional-root-class' }} />;
-  // $ExpectError
-  const nonExistingClassKey = <StyledButton classes={{ notRoot: 'additional-root-class' }} />;
-
-  interface MyTheme {
-    fontFamily: string;
-  }
-  const MyThemeInstance: MyTheme = {
-    fontFamily: 'monospace',
-  };
-  // tslint:disable-next-line: no-empty-interface
-  interface MyComponentProps extends StyledProps {
-    defaulted: string;
-  }
-  class MyComponent extends React.Component<MyComponentProps> {
-    static defaultProps = {
-      defaulted: 'Hello, World!',
-    };
-    render() {
-      const { className, defaulted } = this.props;
-      return <div className={className}>Greeted?: {defaulted.startsWith('Hello')}</div>;
-    }
-  }
-  const StyledMyComponent = styled<typeof MyComponent>(MyComponent)(
-    ({ theme }: { theme: MyTheme }) => ({
-      fontFamily: theme.fontFamily,
-    }),
-  );
-  const renderedMyComponent = (
-    <React.Fragment>
-      <MyComponent className="test" />
-      <StyledMyComponent theme={MyThemeInstance} />
-    </React.Fragment>
-  );
-}

packages/material-ui-styles/src/styled/styled.d.spec.tsx → packages/material-ui-styles/src/styled/styled.spec.tsx

@@ -1,7 +1,7 @@
 import * as React from 'react';
-import { styled } from '@material-ui/styles';
+import { styled, StyledProps } from '@material-ui/styles';
 
-function styledTest() {
+function themeTest() {
   const style = (props: { value: number }) => ({});
   const styleWithTheme = (props: {
     value: number;
@@ -46,3 +46,49 @@ function styledTest() {
   // error: property 'zIndex' is missing in type ...
   <ComponentWithOptionalThemeStyledWithTheme value={1} theme={{ palette: { primary: '#333' } }} />; // $ExpectError
 }
+
+function acceptanceTest() {
+  const StyledButton = styled('button')({
+    background: 'linear-gradient(45deg, #FE6B8B 30%, #FF8E53 90%)',
+    borderRadius: 3,
+    border: 0,
+    color: 'white',
+    height: 48,
+    padding: '0 30px',
+    boxShadow: '0 3px 5px 2px rgba(255, 105, 135, .3)',
+  });
+  const renderedStyledButton = <StyledButton classes={{ root: 'additional-root-class' }} />;
+  // $ExpectError
+  const nonExistingClassKey = <StyledButton classes={{ notRoot: 'additional-root-class' }} />;
+
+  interface MyTheme {
+    fontFamily: string;
+  }
+  const MyThemeInstance: MyTheme = {
+    fontFamily: 'monospace',
+  };
+  // tslint:disable-next-line: no-empty-interface
+  interface MyComponentProps extends StyledProps {
+    defaulted: string;
+  }
+  class MyComponent extends React.Component<MyComponentProps> {
+    static defaultProps = {
+      defaulted: 'Hello, World!',
+    };
+    render() {
+      const { className, defaulted } = this.props;
+      return <div className={className}>Greeted?: {defaulted.startsWith('Hello')}</div>;
+    }
+  }
+  const StyledMyComponent = styled<typeof MyComponent>(MyComponent)(
+    ({ theme }: { theme: MyTheme }) => ({
+      fontFamily: theme.fontFamily,
+    }),
+  );
+  const renderedMyComponent = (
+    <React.Fragment>
+      <MyComponent className="test" />
+      <StyledMyComponent theme={MyThemeInstance} />
+    </React.Fragment>
+  );
+}

packages/material-ui-types/index.d.ts

@@ -44,41 +44,3 @@ export type Omit<T, K extends keyof any> = T extends any ? Pick<T, Exclude<keyof
  * @internal
  */
 export type Overwrite<T, U> = Omit<T, keyof U> & U;
-
-/**
- * Returns true if T is any, otherwise false
- */
-// https://stackoverflow.com/a/49928360/3406963 without generic branch types
-export type IsAny<T> = 0 extends (1 & T) ? true : false;
-
-export type Or<A, B, C = false> = A extends true
-  ? true
-  : B extends true
-  ? true
-  : C extends true
-  ? true
-  : false;
-
-export type And<A, B, C = true> = A extends true
-  ? B extends true
-    ? C extends true
-      ? true
-      : false
-    : false
-  : false;
-
-/**
- * @internal
- *
- * check if a type is `{}`
- *
- * 1. false if the given type has any members
- * 2. false if the type is `object` which is the only other type with no members
- *  {} is a top type so e.g. `string extends {}` but not `string extends object`
- * 3. false if the given type is `unknown`
- */
-export type IsEmptyInterface<T> = And<
-  keyof T extends never ? true : false,
-  string extends T ? true : false,
-  unknown extends T ? false : true
->;

packages/material-ui/src/styles/index.d.ts

@@ -7,7 +7,7 @@ export {
 } from './createPalette';
 export { default as createStyles } from './createStyles';
 export { TypographyStyle } from './createTypography';
-export { default as makeStyles, StylesHook } from './makeStyles';
+export { default as makeStyles } from './makeStyles';
 export { default as responsiveFontSizes } from './responsiveFontSizes';
 export { ComponentsPropsList } from './props';
 export * from './transitions';

packages/material-ui/src/styles/makeStyles.d.ts

@@ -1,15 +1,23 @@
 import { Theme as DefaultTheme } from './createMuiTheme';
-import { Styles, WithStylesOptions } from '@material-ui/styles/withStyles';
-import { StylesHook } from '@material-ui/styles/makeStyles';
+import { ClassNameMap, Styles, WithStylesOptions } from '@material-ui/styles/withStyles';
+
 import { Omit } from '@material-ui/types';
 
+/**
+ * `makeStyles` where the passed `styles` do not depend on props
+ */
+export default function makeStyles<Theme = DefaultTheme, ClassKey extends string = string>(
+  style: Styles<Theme, {}, ClassKey>,
+  options?: Omit<WithStylesOptions<Theme>, 'withTheme'>,
+): (props?: any) => ClassNameMap<ClassKey>;
+/**
+ * `makeStyles` where the passed `styles` do depend on props
+ */
 export default function makeStyles<
   Theme = DefaultTheme,
   Props extends {} = {},
   ClassKey extends string = string
 >(
   styles: Styles<Theme, Props, ClassKey>,
   options?: Omit<WithStylesOptions<Theme>, 'withTheme'>,
-): StylesHook<Styles<Theme, Props, ClassKey>>;
-
-export { StylesHook };
+): (props: Props) => ClassNameMap<ClassKey>;