chore(deps): update dependency postcss to v7 by dev-mend-for-github-com[bot] · Pull Request #177 · amaybaum-dev/atom

We removed IE and “dead” browsers (without security updates) from Babel’s Browserslist. Don't worry, PostCSS still generate IE-compatible code. These changes affect websites which run PostCSS on client-side like CodePen.

last 2 version
not dead
not Explorer 11
not ExplorerMobile 11
node 10
node 8
node 6

New Features

@nikhilgaba added cute thing for plugin developers. If an error was happened in Container#walk() circle, PostCSS will show in stack trace CSS node, which causes this error:

TypeError: Cannot read property '0' of undefined
    at /home/ai/Dev/test/app.css:10:4
    at plugin (plugin.js:2:4)
    at runPostCSS (runner.js:2:1)

@igorkamyshev added finally method to LazyResult to make it compatible with the latest Promise API.

Other Changes

Client-side size was reduced by Size Limit feedback.
Add warning on calling PostCSS without plugins and syntax options.

`v6.0.23`

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Fix parsing nested at-rules without semicolon, params, and spaces.
Fix docs (by Kevin Schiffer and Pat Cavit).

`v6.0.22`

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Fix Node#prev and Node#next on missed parent.

`v6.0.21`

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Rename Chinese docs to fix yarnpkg.com issue.

`v6.0.20`

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Better error message on null as input CSS.

`v6.0.19`

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Fix TypeScript definitions for source maps (by Oleh Kuchuk).
Fix source field in TypeScript definitions (by Sylvain Pollet-Villard).

`v6.0.18`

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Use primitive object in TypeScript definitions (by Sylvain Pollet-Villard).

`v6.0.17`

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Fix parsing comment in selector between word tokens (by Oleh Kuchuk).

`v6.0.16`

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Fix warning text (by Michael Keller).

`v6.0.15`

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Add warning about missed from option on process().then() call.
Add IE 10 support.

`v6.0.14`

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Fix TypeScript definitions (by Jed Mao).

`v6.0.13`

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Fix TypeScript definitions for case of multiple PostCSS versions
in node_modules (by Chris Eppstein).
Use source-map 0.6.

`v6.0.12`

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Don’t copy * hack to declaration indent.

`v6.0.11`

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Add upper case !IMPORTANT support.

`v6.0.10`

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Reduce PostCSS size in webpack bundle.

`v6.0.9`

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Improve error message for plugin with old PostCSS (by Igor Adamenko).

`v6.0.8`

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Fix Node.js 4.2.2 support.

`v6.0.7`

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Fix base64 decoding for old Node.js and browser.

`v6.0.6`

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Fix end position in at-rule without semicolon (by Oleh Kuchuk).

`v6.0.5`

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Move Babel config from package.json for node_modules compiling cases.

`v6.0.4`

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Fix parsing ;; after rules.
Use Chalk 2.0.

`v6.0.3`

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Fix escape sequences parsing (by Oleh Kuchuk).
Added ability to force disable colors with an environment variable.
Improved color detection of some terminal apps.

`v6.0.2`

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Fix parsing nested at-rules without semicolon, params, and spaces.
Fix docs (by Kevin Schiffer and Pat Cavit).

`v6.0.1`

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Fix TypeScript definitions for source maps (by Oleh Kuchuk).
Fix source field in TypeScript definitions (by Sylvain Pollet-Villard).

`v6.0.0`: 6.0 “Marquis Orias”

PostCSS 6.0 drops support for Node.js 0.12, cleans the raws API, adds support for @apply, and uses less memory.

Breaking Changes

Node.js stopped 0.12 support in January 01. So PostCSS dropped Node.js 0.12 from all tests. Please update your Node.js version to 4.0 or 7.0.

In 6.0 we fixed our mistakes in API design. First, if node already had a parent, insert methods (append, insertAfter, etc) will not clone it anymore. In 6.0 inserts methods will remove inserted node from previous parent:

parent1.nodes.length //=> 3
parent2.append(parent1.nodes[0])
parent1.nodes.length //=> 2

Now, moveTo, moveAfter & moveBefore are deprecated because regular insert methods have this move behavior.

Also Node#clone now returns the exact copy of a node. In 6.0 it no longer cleans raws.

node.raws.before //=> "\n  "
const clone = node.clone()
clone.raws.before //=> "\n  "

Every PostCSS plugin has plugin.process shortcut. In 6.0 we split process and plugin options in this shortcut:

const plugin = postcss.plugin('postcss-awesome', colors => {
  …
})
plugin.process(css, { from: 'app.css' }, colors).css

In the new major release, we finally remove all deprecated methods from PostCSS 4.0. It should not be a big problem because we show deprecated warnings for them for 2 years. Most of the plugins updated their API.

New Methods and Properties

Since we removed deprecated methods from PostCSS 4.0, in 6.0 we were free to add before() and after() shortcuts, similar to DOM API methods.

node1.before(node2)
// is equal too
node1.parent.insertBefore(node1, node2)

Chrome 51 started to support “native CSS mixins” from @tabatkins spec under the flag:

:root {
  --clearfix: {
    display: table;
    clear: both;
    content: '';
  };
}

.box:after{
  @&#8203;apply --clearfix;
}

PostCSS 5.0 could parse it pretty well, but in some cases, it lost the semicolon after a mixin definition. In PostCSS 6.0 parser we covered this case, and node rules have Rule#raws.ownSemicolon for their own semicolon.

Stream Parser

In PostCSS 5.0 tokenizing and parsing were separated steps. As a result, we wrote all tokens into memory between steps. It worked well most of the time, but had a large memory usage when parsing really big CSS files (more than 25 MB).

In 6.0 @hzlmn rewrote parser, and now parser and tokenizer work together (stream parser). As a result, we put only a few of the latest tokens in memory. So 6.0 will use less memory.

Package Size

We care about node_modules size problem. So in 6.0 @lahmatiy and @h0tc0d3 removed js-base64 dependency to use native Node.js and Browsers ways to base64 encoding.

Also, PostCSS was moved to babel-preset-env. Instead of regular babel, it will compile only necessary parts of ES6. So build in npm packages will be cleaner. Current browserslist config for babel-preset-env is last 1 version and node 4.