postcss-combine-duplicated-selectors

Update badges in readme, update dev dependencies

Correct typings to do commonjs style export.
Previously typings incorrectly included a default export, which is only supported if esModuleInterop is enabled.

updates documentation comments for typescript typings

9.2.0 and 9.3.0 unintentionally included potentially breaking changes, this re-releases 9.1.0 as 9.4.0 to minimize impact to adopters using a minor (^9) version range in their package.json.

Breaking changes:

• postcss 8 is now required
• postcss is now a peer dependency, run npm install postcss or yarn add postcss to ensure it is in your project
• TypeScript typings are now provided, these typings build in postcss's own typings and require TypeScript 4 or higher

postcss-combine-duplicated-selectors now leverages the postcss single scan visitor API.
This has a few implications:

• With new API, all plugins can share a single scan of the CSS tree. It makes CSS processing up to 20% faster.
• Plugins will re-visit changed nodes to reduce compatibility issues between plugins. Now the order of plugins in your PostCSS config will be less important.

source: https://github.com/postcss/postcss/releases/tag/8.0.0

⚠️ this release unintentionally contains breaking changes, please upgrade directly to version 10, or hold at versio 9.1.0 if that is not possible ⚠️

postcss-combine-duplicated-selectors now leverages the postcss single scan visitor API.
This has a few implications:

• With new API, all plugins can share a single scan of the CSS tree. It makes CSS processing up to 20% faster.
• Plugins will re-visit changed nodes to reduce compatibility issues between plugins. Now the order of plugins in your PostCSS config will be less important.

source: https://github.com/postcss/postcss/releases/tag/8.0.0

For more information on the new tree walking API see: https://evilmartians.com/chronicles/postcss-8-plugin-migration#step-3-take-the-most-out-of-the-new-api and https://github.com/postcss/postcss/releases/tag/8.0.0

⚠️ this release unintentionally contains breaking changes, please upgrade directly to version 10, or hold at versio 9.1.0 if that is not possible ⚠️

postcss 8.1.0 renamed the visitor postcss-combine-duplicated-selectors depends on (Root to Once).
This release updates to the new visitor, and requires postcss 8.1.0 and above.

Note: postcss is now a peer dependency if it is not directly installed already, please run npm install postcss

A new option removeDuplicatedValues has been added. (#534 thanks @MoltenCoffee)

In order to limit this to only combining properties when the values are equal, set the removeDuplicatedValues option to true instead. This could clean up duplicated properties, but allow for conscious duplicates such as fallbacks for custom properties.

const postcss = require('postcss');
const combineSelectors = require('postcss-combine-duplicated-selectors');

postcss([combineSelectors({removeDuplicatedValues: true})]);

This will transform the following css

.a {
  height: 10px;
}

.a {
  width: 20px;
  background: var(--custom-color);
  background: rgba(255, 165, 0, 0.5);
}

into

.a {
  height: 10px;
  width: 20px;
  background: var(--custom-color);
  background: rgba(255, 165, 0, 0.5);
}

Node 8 may still work, but it is no longer a part of the CI tests and is not officially supported.
Node 14 is now officially supported.

https://github.com/postcss/postcss-selector-parser/blob/master/CHANGELOG.md#600

drops support for Node 6

https://github.com/postcss/postcss-selector-parser/blob/master/CHANGELOG.md#500

Groups of css selectors that are logically the same will now be combined (#247 thanks @r-wettstaedt!)

.one .two, .one .three {} .one .three, .one .two {}
/* becomes */
.one .two, .one .three {}

Remove Node.js 9 and Node.js 4 support
Remove IE and “dead” browsers support

https://github.com/postcss/postcss/blob/master/CHANGELOG.md#70-president-amy

Documentation has been updated to reflect new PostCSS command line usage. (#148 thanks to @ItsEddie)

When using postcss-combine-duplicated-selectors with postcss-nested selectors, @font-face now bubbles to the top level, changing how selectors will be combined.
See: https://github.com/postcss/postcss-nested/blob/master/CHANGELOG.md#30

No new features in postcss-combine-duplicated-selectors, just improvements in the underlying technology.

Explicit Node.js version 6 support has been re-added to package.json engines