add mui lint rule

Signed-off-by: Juan Pablo Garcia Ripa <sarabadu@gmail.com>

.changeset/swift-moles-shave.md

@@ -0,0 +1,5 @@
+---
+'@backstage/dev-utils': patch
+---
+
+add @backstage/no-top-level-material-ui-4-imports lint rule

packages/dev-utils/.eslintrc.js

@@ -1 +1,5 @@
-module.exports = require('@backstage/cli/config/eslint-factory')(__dirname);
+module.exports = require('@backstage/cli/config/eslint-factory')(__dirname, {
+  rules: {
+    '@backstage/no-top-level-material-ui-4-imports': 'error',
+  },
+});

packages/dev-utils/api-report.md

@@ -10,7 +10,7 @@ import { AppTheme } from '@backstage/core-plugin-api';
 import { BackstagePlugin } from '@backstage/core-plugin-api';
 import { ComponentType } from 'react';
 import { Entity } from '@backstage/catalog-model';
-import { GridProps } from '@material-ui/core';
+import { GridProps } from '@material-ui/core/Grid';
 import { IconComponent } from '@backstage/core-plugin-api';
 import { PropsWithChildren } from 'react';
 import { ReactNode } from 'react';

packages/dev-utils/src/components/EntityGridItem/EntityGridItem.tsx

@@ -16,7 +16,8 @@
 
 import { Entity } from '@backstage/catalog-model';
 import { EntityProvider } from '@backstage/plugin-catalog-react';
-import { Grid, GridProps, Theme, makeStyles } from '@material-ui/core';
+import Grid, { GridProps } from '@material-ui/core/Grid';
+import { Theme, makeStyles } from '@material-ui/core/styles';
 import React from 'react';
 
 const useStyles = makeStyles<Theme, { entity: Entity }>(theme => ({

packages/dev-utils/src/devApp/SidebarThemeSwitcher.tsx

@@ -15,7 +15,10 @@
  */
 import { SidebarItem } from '@backstage/core-components';
 import { appThemeApiRef, useApi } from '@backstage/core-plugin-api';
-import { ListItemIcon, ListItemText, Menu, MenuItem } from '@material-ui/core';
+import ListItemIcon from '@material-ui/core/ListItemIcon';
+import ListItemText from '@material-ui/core/ListItemText';
+import Menu from '@material-ui/core/Menu';
+import MenuItem from '@material-ui/core/MenuItem';
 import AutoIcon from '@material-ui/icons/BrightnessAuto';
 import React, { cloneElement, useCallback, useState } from 'react';
 import useObservable from 'react-use/esm/useObservable';

packages/dev-utils/src/devApp/render.tsx

@@ -42,7 +42,7 @@ import {
   ScmIntegrationsApi,
   scmIntegrationsApiRef,
 } from '@backstage/integration-react';
-import { Box } from '@material-ui/core';
+import Box from '@material-ui/core/Box';
 import BookmarkIcon from '@material-ui/icons/Bookmark';
 import React, { ComponentType, ReactNode, PropsWithChildren } from 'react';
 import { createRoutesFromChildren, Route } from 'react-router-dom';