Initial commit, prouf of concept

.babelrc

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+{
+  "stage": 0
+}

.editorconfig

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+# http://editorconfig.org
+root = true
+
+[*]
+indent_style = space
+indent_size = 2
+end_of_line = lf
+charset = utf-8
+trim_trailing_whitespace = true
+insert_final_newline = true
+
+[*.md]
+trim_trailing_whitespace = false

.eslintrc

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+{
+  "extends": "airbnb"
+}

.gitignore

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+node_modules/
+npm-debug.log

.npmignore

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+.gitignore
+
+test/
+.travis.yml
+
+gulpfile.js
+
+.eslintrc

package.json

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+{
+  "name": "postcss-reset",
+  "version": "1.0.0",
+  "description": "PostCSS plugin for partial styles reset",
+  "main": "dist/index.js",
+  "scripts": {
+    "prepublish": "babel src --out-dir dist",
+    "lint": "eslint .",
+    "tape": "babel-tape-runner 'test/*.js' | tap-spec",
+    "test": "npm run lint && npm run tape"
+  },
+  "repository": {
+    "type": "git",
+    "url": "https://github.com/maximkoretskiy/postcss-reset.git"
+  },
+  "keywords": [
+    "postcss",
+    "postcss-plugin",
+    "css",
+    "reset",
+    "isolation"
+  ],
+  "author": "Maksim Koretskiy",
+  "license": "MIT",
+  "files": [
+    "dist",
+    "README.md"
+  ],
+  "bugs": {
+    "url": "https://github.com/maximkoretskiy/postcss-reset/issues"
+  },
+  "homepage": "https://github.com/maximkoretskiy/postcss-reset",
+  "devDependencies": {
+    "babel": "^5.8.21",
+    "babel-eslint": "^4.0.10",
+    "babel-tape-runner": "^1.2.0",
+    "eslint": "^1.2.1",
+    "tap-spec": "^4.1.0",
+    "tape": "^4.2.0"
+  },
+  "dependencies": {
+    "postcss": "^5.0.2"
+  }
+}

src/index.js

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+import postcss from 'postcss';
+
+export default postcss.plugin('postcss-autoreset', ()=> {
+  return (css) => {
+    css.walkRules( (rule)=> {
+      const firstNode = rule.nodes[0];
+      if (firstNode) {
+        firstNode.cloneAfter({prop: 'all', value: 'unset'});
+      }else {
+        rule.nodes.push(
+          postcss.decl({prop: 'all', value: 'unset'})
+        );
+      }
+    });
+  };
+});

test/fixtures/default.css

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+.selector-first {
+  padding: 1em;
+}
+
+
+.selector-second{
+}

test/fixtures/default.expected.css

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+.selector {
+  padding: 1em;
+  all: unset;
+}
+
+.selector-second{
+  all: reset;
+}

test/index.js

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+import fs from 'fs';
+import test from 'tape';
+import postcss from 'postcss';
+import plugin from '../src';
+
+function f(name) {
+  const fullName = 'test/fixtures/' + name + '.css';
+  return fs.readFileSync(fullName, 'utf8');
+}
+
+function makeCompareFn(t) {
+  return (input, output, opts = {}) => {
+    const css = postcss()
+      .use(plugin(opts))
+      .process(input).css;
+    t.equal(css, output);
+  };
+}
+
+test('postcss-autoreset', (t)=> {
+  const compare = makeCompareFn(t);
+
+  compare(
+    f('default'),
+    f('default.expected')
+    );
+  t.end();
+});