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progressive-css\nThe future of loading CSS in React applications\n\nServe **only the CSS you need**, with **no runtime overhead** leveraging **HTTP2**. Because performance matters.\nMore info: https://jakearchibald.com/2016/link-in-body/\n\n[Slow connection demo]( https://jakearchibald-demos.herokuapp.com/progressive-css/) (thanks Jake Archibald)\nNotice how reloading is instant.\n\n### Install\n\n- Yarn: `yarn add progressive-css; yarn add -D filehound`\n- Npm: `npm i -S progressive-css; npm i -D filehound`\n\n(filehound is a peer dependency)\n\n### Example usage:\n\n###### Awesome.js\n```jsx\nimport React, { Component } from 'react';\nimport withCSS from 'progressive-css';\n\n// Must be named __CSS__ and cannot import its value\nconst __CSS__ = ['/styles/normalize.css', '/styles/Awesome.*.*.css'];\n\nclass Awesome extends Component {\n  render() {\n    return \u003cdiv className=\"hello\"\u003eHello World\u003c/div\u003e;\n  }\n}\n\nexport default withCSS(__CSS__)(Awesome);\n```\n\nAdd the babel plugin\n\n###### .babelrc\n```\n\"plugins\": [\n  // ... other plugins,\n  [\"progressive-css/babel-plugin\", { root: \"./\", isProd: process.env.NODE_ENV === 'production' }]\n]\n```\n\n###### Output (production):\n```html\n\u003clink rel=\"stylesheet\" href=\"/styles/normalize.css\" /\u003e\n\u003clink rel=\"stylesheet\" href=\"/styles/Awesome.h4sh3d.min.css\" /\u003e\n\u003cscript\u003e \u003c/script\u003e\n\u003cdiv class=\"hello\"\u003eHello World\u003c/div\u003e\n```\n\nDuring development it will point to /styles/Awesome.css instead.\n\n### API\n\n#### React\n`const __CSS__ = string[]` Paths to stylesheets, resolved as `\u003clink href=\"path\" /\u003e`\n**MUST** be named `__CSS__` if using the babel plugin, with a static value (not imported).\nA path can contain a glob but must be dot-delimited.\n\n\nwithCSS(**\\__CSS\\__**, **scriptBlock**: boolean = true, **persist**: boolean = false)(**Component**);  \n\n\nIf `scriptBlock` is false, then it won't inject empty script tags to work around Firefox Flash Of Unstyled Content\n  \n`persist` will keep those stylesheets in __CSS__ loaded in the document head even after the component unmounts\n\n\n##### Server-side rendering\n**flushCSS()**  \n\nIf you perform server-side rendering you must let progressive-css know when to flush its CSS chunks. This is usually every\ntime you call the reactDomServer methods (eg renderToString())\n\nExample\n```jsx\n// server-render.js\n\nimport React from 'react';\nimport { renderToString } from 'react-dom/server';\nimport { flushCSS } from 'progressive-css'\n\nconst getPage = (req, res) =\u003e {\n   const toRender = renderToString(\u003cApp /\u003e);\n   flushCSS();\n   \n   const result = `\n\u003c!DOCTYPE html\u003e\n\u003chtml lang=\"en\"\u003e\n  \u003chead\u003e\n    \u003cmeta charSet=\"utf-8\"\u003e\n    \u003ctitle\u003eExample\u003c/title\u003e\n  \u003c/head\u003e\n  \u003cbody\u003e\n    \u003cdiv id=\"root\"\u003e${toRender}\u003c/div\u003e\n  \u003c/body\u003e\n\u003c/html\u003e\n`;\n\n   res.status(200).send(result);\n}\n```\n\n**flushCSS()** returns an array of the loaded CSS paths **that were cleared**, which can optionally be used\nfor things like preloading.\n\n**getCSS()** returns an array of the currently loaded CSS paths **without clearing them** \n\n###### Example: preload the first 3 css chunks\n```jsx\nconst toRender = renderToString(\u003cApp /\u003e);\nconst cssChunks = flushCSS();\n\nconst result = `\n\u003c!DOCTYPE html\u003e\n\u003chtml lang=\"en\"\u003e\n  \u003chead\u003e\n    \u003cmeta charSet=\"utf-8\"\u003e\n    \u003ctitle\u003eExample\u003c/title\u003e\n    ${\n      cssChunks \u0026\u0026 cssChunks[0]\n        ? cssChunks\n            .slice(0, 3)\n            .map((href) =\u003e `\u003clink rel=\"preload\" href=\"${href}\" as=\"style\"\u003e`)\n            .join('\\n')\n        : ''\n    }\n  \u003c/head\u003e\n  \u003cbody\u003e\n    \u003cdiv id=\"root\"\u003e${toRender}\u003c/div\u003e\n  \u003c/body\u003e\n\u003c/html\u003e\n`;\n```\n\n#### Babel\n```javascript\nconst defaultOptions = {\n  root: './', // All CSS paths are resolved relative to this\n  isProd: false, // Enable to turn on file discovery and glob matching\n  replaceDir: undefined // [regexp|substr, newSubstr|function] Applies string.replace() to the directories\n}\n```\n\nShould be the last plugin. The css is resolved relative to `./` unless the `root` option specifies otherwise.\n**In production** you must specify `isProd: true`.  \n`replaceDir` is useful for separating your production CSS files. For example:\n\n\n`replaceDir: ['/styles/', '/dist/']` turns  \n`['/styles/normalize.css', '/styles/Awesome.*.*.css'];`  \ninto  \n`['/dist/normalize.css', '/dist/Awesome.*.*.css'];`\n\n\n### SSR\nServer-side rendering works out of the box using the provided babel plugin.\n","project_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fgekorm%2Fprogressive-css","html_url":"https://awesome.ecosyste.ms/projects/github.com%2Fgekorm%2Fprogressive-css","lists_url":"https://awesome.ecosyste.ms/api/v1/projects/github.com%2Fgekorm%2Fprogressive-css/lists"}