Add Purgecss to with-tailwindcss example #9145

taylorbryant · 2019-10-21T03:34:46Z

By default, Tailwind CSS generates a stylesheet that’s 477.6kb. To combat the large file size, Tailwind CSS recommends using Purgecss.

This PR:

Closes add purge css in tailwind css example #9142
Pulls in @fullhuman/postcss-purgecss as a dependency
Adds Purgecss to the list of PostCSS plugins and incorporates an extractor that's compatible with Tailwind CSS
Wraps the Tailwind CSS base styles in a comment to prevent purging
Improves the README and addresses limitations caused by Purgecss
Adds cssnano to the list of PostCSS plugins; it's in the package.json, but it wasn't being used

ijjk · 2019-10-21T03:40:53Z

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Serverless Mode

General

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Commit: eccadd6

Timer · 2019-10-21T14:44:07Z

How does this work for HTML classes that are dynamically composed?

taylorbryant · 2019-10-21T15:36:28Z

How does this work for HTML classes that are dynamically composed?

It won't work with dynamically composed classes. Purgecss is "dumb" and simply looks for a matching string.

Here's what the docs say about that issue:
https://tailwindcss.com/docs/controlling-file-size/#writing-purgeable-html

What do you think the best path forward is? Should I create a separate example that uses Purgecss instead of baking it into this example?

Timer · 2019-10-21T15:49:30Z

I'm OK with it being in the example as long as we explicitly call out this restriction.

examples/with-tailwindcss/README.md

Timer

Thanks!

examples/with-tailwindcss/postcss.config.js

justsee · 2019-10-24T03:52:52Z

Hi @taylorbryant, thanks for the example and PR!

One issue having just used it in familiarising myself with tailwindcss - the dependency on purgecss in development breaks auto-reloading of styles.

The docs themselves recommend only depending on it in production, (and adding it as the last dependency, though not sure why this is important): https://tailwindcss.com/docs/controlling-file-size/

// postcss.config.js
const purgecss = require('@fullhuman/postcss-purgecss')({

  // Specify the paths to all of the template files in your project 
  content: [
    './src/**/*.html',
    './src/**/*.vue',
    './src/**/*.jsx',
    // etc.
  ],

  // Include any special characters you're using in this regular expression
  defaultExtractor: content => content.match(/[\w-/:]+(?<!:)/g) || []
})

module.exports = {
  plugins: [
    require('tailwindcss'),
    require('autoprefixer'),
    ...process.env.NODE_ENV === 'production'
      ? [purgecss]
      : []
  ]
}

Is it possible to push a commit to this PR to merge again, or create a new one?

justsee · 2019-10-24T03:56:12Z

I've just modified your example postcss.config.js as follows:

module.exports = ({ env }) => ({
  plugins: [
    require('postcss-easy-import'),
    require('tailwindcss'),
    require('autoprefixer'),
    require('cssnano'),
    env === 'production'
      ? require('@fullhuman/postcss-purgecss')({
        content: ['./pages/**/*.js', './components/**/*.js'],
        defaultExtractor: content => content.match(/[A-Za-z0-9-_:/]+/g) || []
      })
      : false
  ]
})

Add Purgecss

eccadd6

taylorbryant requested review from lfades and Timer as code owners October 21, 2019 03:34

taylorbryant mentioned this pull request Oct 21, 2019

add purge css in tailwind css example #9142

Closed

Remove trailing comma

e1814c2

Fix linting errors

5839ffe

Merge branch 'canary' into canary

462b2f0

bk3c mentioned this pull request Oct 21, 2019

Add purgecss bloom-housing/bloom#78

Closed

Update README.md

aa1e171

taylorbryant commented Oct 23, 2019

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taylorbryant commented Oct 23, 2019

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Timer approved these changes Oct 23, 2019

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Add cssnano to PostCSS plugins

be6aba0

Timer added this to the 9.1.2 milestone Oct 23, 2019

Timer added ready to land examples Issue/PR related to examples labels Oct 23, 2019

taylorbryant added 2 commits October 22, 2019 21:42

Use single quotes

55149f4

Merge branch 'canary' into canary

a721f75

taylorbryant commented Oct 23, 2019

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Timer merged commit b96f1ae into vercel:canary Oct 23, 2019

This was referenced Nov 19, 2019

[Snyk] Upgrade next from 9.1.2 to 9.1.3 ndom91/newtelco-next-maintenance-mgmt#10

Merged

[Snyk] Upgrade next from 9.0.4 to 9.1.3 ajesse11x/now-examples#17

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Add Purgecss to with-tailwindcss example #9145

Add Purgecss to with-tailwindcss example #9145

taylorbryant commented Oct 21, 2019 •

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Timer commented Oct 21, 2019

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justsee commented Oct 24, 2019

justsee commented Oct 24, 2019

Add Purgecss to with-tailwindcss example #9145

Add Purgecss to with-tailwindcss example #9145

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ijjk commented Oct 21, 2019

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