We have released a new major version of cssnano.

Major changes in cssnano 5​

• cssnano 5 requires Node.js >= 10.13
• PostCSS 8 API, so cssnano 5 does not emit warnings when running under PostCSS 8
• updates to SVGO 2, fixing many SVG minification bugs
• updates css-value-parser and css-selector-parser, fixing many bugs

How to Upgrade​

Update the PostCSS dependency​

Add postcss to your package.json dependencies field, if your package manager does not install peer dependencies automatically.

JavaScript API changes​

If you use the cssnano JavaScript API, change your code:

• replace cssnano.process() with cssnano().process() (notice the () after cssnano)

• pass cssnano options to cssnano() instead of process()

cssnano(cssnanoOptions).process(postcssOptions)

Bug fixes​

• fix improperly discarding @font-face declarations #726
• partially fix some isues where cssnano did not combine rules when used together with postcss-nested #1004
• fix translate3d() minification #920
• fix minification of values starting with e #589, #984
• fix minification of percentage vaalues #962, #957
• fix minification of aspect-ratio #963
• fix merging of @supports rules #974
• fix sorting of longhand and shorthand properties #535
• remove vulnerable dependency and always warn with bad SVG input #1034