webpack - 使用 PostCSS 8 的 Gatsby - 尝试导入错误 : 'component.module.css' does not contain a default export (imported as 'styles' )

Question

我有一个基于入门项目的 Gatsby and Sanity 网站。到目前为止一切都很好，但是我今天在我的 package.json 文件中更新了我所有的包和插件，以摆脱所有 npm 警告。这包括更新到 Gatsby 3.0.3 和 PostCss 8(我现在也在使用 gatsby-plugin-postcss 4.0.0)。
我设法解决了一些初始错误，但现在我遇到了无法识别我的 CSS 模块的问题。我收到每个组件文件的错误:
尝试导入错误:“[componentName].module.css”不包含默认导出(导入为“样式”)
当我在 react 组件中导入css文件时

import styles from './[componentName].module.css'

样式对象返回未定义。我需要降级到其中一些软件包的旧版本吗？
这是我的 package.json:

  "dependencies": {
    "@cloudflare/wrangler": "^1.15.0",
    "@fontsource/montserrat": "^4.2.2",
    "@fontsource/raleway": "^4.2.2",
    "@sanity/block-content-to-react": "^2.0.7",
    "@sanity/client": "^2.2.6",
    "@sanity/image-url": "^0.140.22",
    "date-fns": "^2.19.0",
    "dotenv": "^8.2.0",
    "gatsby": "^3.0.3",
    "gatsby-plugin-anchor-links": "^1.2.1",
    "gatsby-plugin-manifest": "^3.0.0",
    "gatsby-plugin-react-helmet": "^4.0.0",
    "gatsby-source-sanity": "^6.0.5",
    "get-youtube-id": "^1.0.1",
    "postcss-import": "^14.0.0",
    "postcss-preset-env": "^6.7.0",
    "react": "^17.0.1",
    "react-autosize-textarea": "^7.1.0",
    "react-dom": "^17.0.1",
    "react-helmet": "^6.1.0",
    "react-hook-form": "^6.15.4",
    "react-icons": "^4.2.0",
    "react-script": "^2.0.5",
    "react-youtube": "^7.13.1"
  },
  "devDependencies": {
    "eslint": "^7.21.0",
    "eslint-config-standard": "^16.0.2",
    "eslint-config-standard-react": "^11.0.1",
    "eslint-plugin-import": "^2.22.1",
    "eslint-plugin-node": "^11.1.0",
    "eslint-plugin-promise": "^4.3.1",
    "eslint-plugin-react": "^7.22.0",
    "eslint-plugin-standard": "^4.1.0",
    "gatsby-plugin-postcss": "^4.0.0",
    "postcss": "^8.2.7",
    "prettier-eslint-cli": "^5.0.1",
    "prop-types": "^15.7.2"
  }

Answer 1

从 Gatsby v3 开始，您需要将模块作为 ES 模块导入:

import * from './[componentName].module.css'

在你的情况下:

import * as styles from './[componentName].module.css'

请记住，一次导入所有样式不会让 webpack 对您的样式进行 treeshake。首选方法是单独导入模块，例如:

import { style1, style2 } from './mystyles.module.css

您可以关注此 GitHub thread 中讨论的堆栈跟踪。 .