theme: explicit type imports from MUI v4

Signed-off-by: Patrik Oldsberg <poldsberg@gmail.com>

packages/theme/src/unified/UnifiedTheme.tsx

@@ -14,12 +14,12 @@
  * limitations under the License.
  */
 
-import {
+import { createTheme as createV4Theme } from '@material-ui/core/styles';
+import type {
   Theme as Mui4Theme,
-  createTheme as createV4Theme,
   ThemeOptions as ThemeOptionsV4,
 } from '@material-ui/core/styles';
-import { PaletteOptions as PaletteOptionsV4 } from '@material-ui/core/styles/createPalette';
+import type { PaletteOptions as PaletteOptionsV4 } from '@material-ui/core/styles/createPalette';
 import { PaletteOptions as PaletteOptionsV5 } from '@mui/material/styles/createPalette';
 import {
   adaptV4Theme,

packages/theme/src/unified/UnifiedThemeProvider.tsx

@@ -17,9 +17,9 @@
 import React, { ReactNode } from 'react';
 import {
   StylesProvider as Mui4StylesProvider,
-  Theme as Mui4Theme,
   ThemeProvider as Mui4Provider,
 } from '@material-ui/core/styles';
+import type { Theme as Mui4Theme } from '@material-ui/core/styles';
 import {
   StyledEngineProvider,
   Theme as Mui5Theme,

packages/theme/src/unified/overrides.ts

@@ -14,8 +14,8 @@
  * limitations under the License.
  */
 
-import { Overrides } from '@material-ui/core/styles/overrides';
-import { ComponentsProps } from '@material-ui/core/styles/props';
+import type { Overrides } from '@material-ui/core/styles/overrides';
+import type { ComponentsProps } from '@material-ui/core/styles/props';
 import { ComponentsOverrides, Theme, ThemeOptions } from '@mui/material/styles';
 import { CSSProperties } from 'react';
 

packages/theme/src/v4/baseTheme.ts

@@ -16,7 +16,12 @@
 
 import { Theme as Mui5Theme } from '@mui/material/styles';
 import { createTheme as createMuiTheme } from '@material-ui/core/styles';
-import { GridProps, SwitchProps, Theme, ThemeOptions } from '@material-ui/core';
+import type {
+  GridProps,
+  SwitchProps,
+  Theme,
+  ThemeOptions,
+} from '@material-ui/core';
 import { Overrides } from '@material-ui/core/styles/overrides';
 import { SimpleThemeOptions } from './types';
 import { createBaseThemeOptions } from '../base';

packages/theme/src/v4/types.ts

@@ -14,10 +14,13 @@
  * limitations under the License.
  */
 
-import { Theme, ThemeOptions } from '@material-ui/core';
-import {
-  PaletteOptions,
-  Palette,
+import type {
+  Theme as MuiTheme,
+  ThemeOptions as MuiThemeOptions,
+} from '@material-ui/core';
+import type {
+  PaletteOptions as MuiPaletteOptions,
+  Palette as MuiPalette,
 } from '@material-ui/core/styles/createPalette';
 import {
   BackstagePaletteAdditions,
@@ -32,7 +35,7 @@ import {
  * @public
  * @deprecated This type is deprecated, the MUI Palette type is now always extended instead.
  */
-export type BackstagePalette = Palette & BackstagePaletteAdditions;
+export type BackstagePalette = MuiPalette & BackstagePaletteAdditions;
 
 /**
  * The full Backstage palette options.
@@ -40,7 +43,7 @@ export type BackstagePalette = Palette & BackstagePaletteAdditions;
  * @public
  * @deprecated This type is deprecated, the MUI PaletteOptions type is now always extended instead.
  */
-export type BackstagePaletteOptions = PaletteOptions &
+export type BackstagePaletteOptions = MuiPaletteOptions &
   BackstagePaletteAdditions;
 
 /**
@@ -55,7 +58,7 @@ export type BackstagePaletteOptions = PaletteOptions &
  * {@link BackstageTheme}.
  *
  */
-export interface BackstageThemeOptions extends ThemeOptions {
+export interface BackstageThemeOptions extends MuiThemeOptions {
   palette: BackstagePaletteOptions;
   page: PageTheme;
   getPageTheme: (selector: PageThemeSelector) => PageTheme;
@@ -67,7 +70,7 @@ export interface BackstageThemeOptions extends ThemeOptions {
  * @public
  * @deprecated This type is deprecated, the MUI Theme type is now always extended instead.
  */
-export interface BackstageTheme extends Theme {
+export interface BackstageTheme extends MuiTheme {
   palette: BackstagePalette;
   page: PageTheme;
   getPageTheme: (selector: PageThemeSelector) => PageTheme;
@@ -81,7 +84,7 @@ export interface BackstageTheme extends Theme {
  * @deprecated Use {@link BaseThemeOptionsInput} instead.
  */
 export type SimpleThemeOptions = {
-  palette: PaletteOptions;
+  palette: MuiPaletteOptions;
   defaultPageTheme?: string;
   pageTheme?: Record<string, PageTheme>;
   fontFamily?: string;