chore: update to postcss 8 (#41)

* chore: bump minimum Node version to v12

* chore: declare postcss as peer dependency

* chore: update dev env to Node 16

* chore: update escape-string-regexp to v4

* chore: engines set to node >= 10

* chore: use github actions

* test: run prettier in CI

* refactor: use postcss 8 api

* chore: update github actions deps

.editorconfig

@@ -2,11 +2,8 @@ root = true
 
 [*]
 indent_style = space
-indent_size = 4
+indent_size = 2
 end_of_line = lf
 charset = utf-8
 trim_trailing_whitespace = true
 insert_final_newline = true
-
-[*.{json,yml}]
-indent_size = 2

.github/ISSUE_TEMPLATE.md

@@ -1,7 +1,9 @@
-### Do you want to request a *feature* or report a *bug*?
+### Do you want to request a _feature_ or report a _bug_?
+
 ...
 
 ### What is the current behaviour?
+
 ...
 
 ### What is the expected behaviour?
@@ -10,12 +12,12 @@
 
 ### Steps to Reproduce the Problem
 
-  1. ...
-  2. ...
-  3. ...
+1. ...
+2. ...
+3. ...
 
 ### Specifications
 
-  - Version:
-  - Platform:
-  - Subsystem:
+- Version:
+- Platform:
+- Subsystem:

.github/PULL_REQUEST_TEMPLATE.md

@@ -1,19 +1,22 @@
-### What kind of change does this PR introduce? *(Bug fix, feature, docs update, ...)*
+### What kind of change does this PR introduce? _(Bug fix, feature, docs update, ...)_
+
 ...
 
-### What is the current behaviour? *(You can also link to an open issue here)*
+### What is the current behaviour? _(You can also link to an open issue here)_
+
 ...
 
 ### What is the new behaviour?
-...
 
-### Does this PR introduce a breaking change? *(What changes might users need to make in their application due to this PR?)*
 ...
 
+### Does this PR introduce a breaking change? _(What changes might users need to make in their application due to this PR?)_
 
-### Other information:
+...
 
+### Other information:
 
 ### Please check if the PR fulfills these requirements:
+
 - [ ] Tests for the changes have been added
 - [ ] Docs have been added / updated

.github/workflows/ci.yml

@@ -0,0 +1,26 @@
+---
+name: CI
+on:
+  push:
+    branches:
+      - master
+  pull_request:
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Use Node.js 16.15
+        uses: actions/setup-node@v3
+        with:
+          node-version: '16.15'
+
+      - run: npm ci
+
+      - name: Upload code coverage
+        uses: coverallsapp/github-action@master
+        with:
+          github-token: ${{ secrets.GITHUB_TOKEN }}

.gitignore

@@ -1,2 +1,4 @@
 node_modules/
 npm-debug.log
+.nyc_output
+coverage

.nvmrc

@@ -0,0 +1 @@
+16.15

.prettierignore

@@ -0,0 +1,5 @@
+.git/
+package.json
+package-lock.json
+.nyc_output
+coverage

.prettierrc

@@ -0,0 +1,4 @@
+{
+  "singleQuote": true,
+  "trailingComma": "es5"
+}

CHANGELOG.md

@@ -1,22 +1,34 @@
+## 3.0.0
+
+Breaking Changes
+
+- Use `PostCSS` 8
+- Node supported version >=12
+
 ## 2.0.0
+
 - Consider `rule` nodes only when when building ancestor selectors
 - Use `PostCSS` 6
 - Restrict support to `node.js` >= 4
 - Remove `object-assign` dependency
 
 ## 1.0.0
+
 - Solve complex nesting scenarios scenarios externalizing parent selectors resolution to [postcss-resolve-nested-selector](https://github.com/davidtheclark/)
 - Refactor bootstrap function using `walkRules` and `walkDecls` PostCSS methods
 - `replaceDeclarations` option will replace declaration values only
 
 ## 0.1.0
+
 - Add experimental `replaceDeclarations` option, to process declaration props and values, too
 - Cast warning when nestingLevel >= parentsStack.length
 - Move `spacesAndAmpersandRegex` regex into a reusable regex
 - Add a failing test case documenting issues when complex nesting
 
 ## 0.0.1
+
 - Fix `levelSymbol` and `parentSymbol` options not being used
 
 ## 0.0.0
+
 - Initial release