无法导入@material-ui/core/styles/MuiThemeProvider

Question

我正在开发一个 React 项目，使用 Material UI React 组件。我想像这样在src/index.js 中导入MuiThemeProvider import MuiThemeProvider from "@material-ui/core/styles/MuiThemeProvider"; .

但我明白了

找不到模块：无法解析“@material-ui/core/styles/MuiThemeProvider”

检查/node_modules/@material-ui/styles 没有MuiThemeProvider。我不明白。在另一台计算机上新安装项目，/node_modules/@material-ui/styles 包含MuiThemeProvider。我删除了node_modules 文件夹并使用yarn install 重新安装，但这并没有做任何事情。 当我在另一台计算机上新安装项目时，它工作正常。

这些是来自package.json的依赖项

"dependencies": {
    "@material-ui/core": "^4.5.0",
    "@material-ui/icons": "^3.0.2",
    "@turf/turf": "^5.1.6",
    "axios": "^0.18.0",
    "epsg-index": "^0.27.0",
    "immutable": "^3.8.2",
    "immutable-prop-types": "^0.0.3",
    "lodash": "^4.17.11",
    "mapbox-gl": "^1.2.0",
    "moment": "^2.22.2",
    "particles.js": "^2.0.0",
    "phoenix": "^1.4.8",
    "proj4": "^2.5.0",
    "prop-types": "^15.7.2",
    "rc-tooltip": "^3.7.3",
    "react": "^16.4.2",
    "react-dom": "^16.9.0",
    "react-loader-spinner": "^2.3.0",
    "react-redux": "^5.0.7",
    "react-router-dom": "^5.0.0",
    "react-slick": "^0.23.2",
    "react-stripe-elements": "^4.0.0",
    "react-test-renderer": "^16.8.1",
    "redux": "^4.0.0",
    "redux-actions": "^2.6.1",
    "redux-auth-wrapper": "^2.1.0",
    "redux-devtools-extension": "^2.13.5",
    "redux-immutable": "^4.0.0",
    "redux-logger": "^3.0.6",
    "redux-thunk": "^2.3.0"
  },
  "devDependencies": {
    "babel-preset-env": "^1.7.0",
    "enzyme": "^3.8.0",
    "enzyme-adapter-react-16": "^1.9.1",
    "enzyme-to-json": "^3.3.5",
    "jsdom": "^13.2.0",
    "jsdom-global": "^3.0.2",
    "react-scripts": "2.1.8",
    "redux-mock-store": "^1.5.3"
  },
  "resolutions": {
    "**/**/fsevents": "^1.2.9"
  },

为什么它会在两台机器上安装不同？！

Answer 1

不需要明确拉入 @material-ui/styles（如 Davin 的回答所示）。事实上，在你的package.jsoncan lead to problems 中明确包含该包，因为它不止一次地被拉入你的包中。

来自https://material-ui.com/blog/september-2019-update/：

从 v4.5.1 开始，文档尽可能地提到了@material-ui/core/styles。

此更改无需直接安装 @material-ui/styles 包。它可以防止 @material-ui/styles 在包中重复并避免混淆。

另见https://material-ui.com/styles/basics/#material-ui-core-styles-vs-material-ui-styles

您的导入问题在于：

import MuiThemeProvider from "@material-ui/core/styles/MuiThemeProvider";

代替：

import {MuiThemeProvider} from "@material-ui/core/styles";

只有当MuiThemeProvider 是@material-ui/core/styles 中的单独文件或目录时，第一个才有效，但事实并非如此。第二种语法用于从@material-ui/core/styles 命名导出，即what it is。

Answer 2

看起来你需要引入另一个包：@material-ui/styles。然后，您可以使用ThemeProvider 组件来设置主题as described here。

import { createMuiTheme } from '@material-ui/core/styles';
import { ThemeProvider } from '@material-ui/styles';

const theme = createMuiTheme({
    ...
})

...
    <ThemeProvider theme={theme}>
      <MyChild />
    </ThemeProvider>
...

Answer 3

您应该使用新库：@mui/material/ 是的，v5 已经发布！ 检查：Migration from v4 to v5

例如，这是我的应用程序

import { ThemeProvider, createTheme } from '@mui/material/styles'

const theme = createTheme({
  palette: {
    primary: {
      main: '#1476A3',
    },
    secondary: {
      main: '#292977',
    },
  },
  typography: {
    fontFamily: ['Roboto', 'sans-serif'].join(','),
  },
  components: {
    MuiPaper: {
      styleOverrides: {
        rounded: {
          borderRadius: '12px',
        },
      },
    },
    MuiButton: {
      styleOverrides: {
        root: {
          borderRadius: '8px',
        },
      },
    },
  },
})

const App = ({ children }) => (
  <main>
    <ThemeProvider theme={theme}>{children}</ThemeProvider>
  </main>
)

export default App