diff --git a/.eslintrc b/.eslintrc
index 6b6f93a..49e3ae3 100644
--- a/.eslintrc
+++ b/.eslintrc
@@ -1,27 +1,35 @@
 {
-  "env": {
-    "node": true,
-    "mocha": true,
-    "es6": true
-  },
-  "extends": "eslint:recommended",
-  "rules": {
-    "indent": [
-      "error",
-      2,
-      { "VariableDeclarator": 2 }
-    ],
-    "linebreak-style": [
-      "error",
-      "unix"
-    ],
-    "quotes": [
-      "error",
-      "single"
-    ],
-    "semi": [
-      "error",
-      "always"
-    ]
-  }
-}
\ No newline at end of file
+    "env": {
+        "node": true,
+        "mocha": true
+    },
+
+    "rules": {
+        // Possible errors
+        "no-cond-assign": 0,
+        "no-console": 0,
+        "no-extra-parens": 2,
+
+        // Best practices
+        "block-scoped-var": 2,
+        "eqeqeq": [2, "smart"],
+        "no-else-return": 2,
+        "no-floating-decimal": 2,
+        "wrap-iife": [2, "inside"],
+
+        // Variables
+        "no-use-before-define": 1,
+
+        // Stylistic issues
+        "brace-style": 2,
+        "camelcase": 2,
+        "new-cap": 2,
+        "no-lonely-if": 2,
+        "no-underscore-dangle": 2,
+        "space-after-keywords": 2,
+        "space-in-brackets": 0,
+        "space-infix-ops": 2,
+        "one-var": 2,
+        "quotes": [2, "single"]
+    }
+}
diff --git a/.gitignore b/.gitignore
index 51af743..1ca9571 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1,6 +1,2 @@
-# Deps
-node_modules
-
-# Runtime
-*.log
-.DS_Store
+node_modules/
+npm-debug.log
diff --git a/.npmignore b/.npmignore
new file mode 100644
index 0000000..9e17589
--- /dev/null
+++ b/.npmignore
@@ -0,0 +1,10 @@
+.gitignore
+
+node_modules/
+
+test/
+.travis.yml
+
+gulpfile.js
+
+demo.gif
diff --git a/.travis.yml b/.travis.yml
index a6de395..ffb8b39 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -1,5 +1,6 @@
 sudo: false
 language: node_js
 node_js:
-  - 4
-  - 5
+  - iojs
+  - "0.12"
+  - "0.10"
diff --git a/CHANGELOG.md b/CHANGELOG.md
deleted file mode 100644
index 2ebc13b..0000000
--- a/CHANGELOG.md
+++ /dev/null
@@ -1,115 +0,0 @@
-# Change Log
-
-## [Unreleased](https://github.com/seaneking/postcss-responsive-type/tree/HEAD)
-
-[Full Changelog](https://github.com/seaneking/postcss-responsive-type/compare/v1.0.0...HEAD)
-
-**Closed issues:**
-
-- Publish v1.0.0 on npm registry [\#29](https://github.com/seaneking/postcss-responsive-type/issues/29)
-
-## [v1.0.0](https://github.com/seaneking/postcss-responsive-type/tree/v1.0.0) (2017-07-07)
-[Full Changelog](https://github.com/seaneking/postcss-responsive-type/compare/v0.6.0...v1.0.0)
-
-## [v0.6.0](https://github.com/seaneking/postcss-responsive-type/tree/v0.6.0) (2017-07-07)
-[Full Changelog](https://github.com/seaneking/postcss-responsive-type/compare/v0.5.1...v0.6.0)
-
-**Merged pull requests:**
-
-- Upgrade postcss and misc dependencies [\#28](https://github.com/seaneking/postcss-responsive-type/pull/28) ([perrin4869](https://github.com/perrin4869))
-
-## [v0.5.1](https://github.com/seaneking/postcss-responsive-type/tree/v0.5.1) (2017-02-13)
-[Full Changelog](https://github.com/seaneking/postcss-responsive-type/compare/v0.5.0...v0.5.1)
-
-**Closed issues:**
-
-- error in Chrome Develop Tool's mobile debug [\#25](https://github.com/seaneking/postcss-responsive-type/issues/25)
-
-**Merged pull requests:**
-
-- Adds support for negative values [\#26](https://github.com/seaneking/postcss-responsive-type/pull/26) ([toreholmberg](https://github.com/toreholmberg))
-
-## [v0.5.0](https://github.com/seaneking/postcss-responsive-type/tree/v0.5.0) (2016-11-25)
-[Full Changelog](https://github.com/seaneking/postcss-responsive-type/compare/v0.4.0...v0.5.0)
-
-**Closed issues:**
-
-- README example --- incorrect [\#21](https://github.com/seaneking/postcss-responsive-type/issues/21)
-- Support responsive line-height [\#18](https://github.com/seaneking/postcss-responsive-type/issues/18)
-
-**Merged pull requests:**
-
-- incorrect syntax -- fixes \#21  [\#22](https://github.com/seaneking/postcss-responsive-type/pull/22) ([artisin](https://github.com/artisin))
-
-## [v0.4.0](https://github.com/seaneking/postcss-responsive-type/tree/v0.4.0) (2016-06-17)
-[Full Changelog](https://github.com/seaneking/postcss-responsive-type/compare/v0.3.4...v0.4.0)
-
-**Merged pull requests:**
-
-- Add support for responsive line height + bonuses [\#20](https://github.com/seaneking/postcss-responsive-type/pull/20) ([perrin4869](https://github.com/perrin4869))
-
-## [v0.3.4](https://github.com/seaneking/postcss-responsive-type/tree/v0.3.4) (2016-06-11)
-[Full Changelog](https://github.com/seaneking/postcss-responsive-type/compare/v0.3.3...v0.3.4)
-
-**Closed issues:**
-
-- pixrem / cssnext incompatibility ? [\#16](https://github.com/seaneking/postcss-responsive-type/issues/16)
-- Use 'em' instead of 'px' for 'font-range' [\#13](https://github.com/seaneking/postcss-responsive-type/issues/13)
-- Fallback with media queries [\#12](https://github.com/seaneking/postcss-responsive-type/issues/12)
-- Responsive 'px' restriction is not working [\#10](https://github.com/seaneking/postcss-responsive-type/issues/10)
-
-**Merged pull requests:**
-
-- Add em related tests and explanation [\#19](https://github.com/seaneking/postcss-responsive-type/pull/19) ([perrin4869](https://github.com/perrin4869))
-
-## [v0.3.3](https://github.com/seaneking/postcss-responsive-type/tree/v0.3.3) (2016-02-18)
-[Full Changelog](https://github.com/seaneking/postcss-responsive-type/compare/v0.3.2...v0.3.3)
-
-**Merged pull requests:**
-
-- Fix regex for font-size matching [\#11](https://github.com/seaneking/postcss-responsive-type/pull/11) ([adam-beck](https://github.com/adam-beck))
-
-## [v0.3.2](https://github.com/seaneking/postcss-responsive-type/tree/v0.3.2) (2015-12-05)
-[Full Changelog](https://github.com/seaneking/postcss-responsive-type/compare/v0.3.1...v0.3.2)
-
-**Closed issues:**
-
-- Calc sizing not working in Chrome [\#8](https://github.com/seaneking/postcss-responsive-type/issues/8)
-
-**Merged pull requests:**
-
-- Removed space in rules.responsive to prevent breaking in chrome\(v47+\) [\#7](https://github.com/seaneking/postcss-responsive-type/pull/7) ([croesike](https://github.com/croesike))
-- Update docs so responsive-type gets executed [\#5](https://github.com/seaneking/postcss-responsive-type/pull/5) ([quintenvk](https://github.com/quintenvk))
-- Corrected the formula in the documentation [\#4](https://github.com/seaneking/postcss-responsive-type/pull/4) ([aeyoll](https://github.com/aeyoll))
-
-## [v0.3.1](https://github.com/seaneking/postcss-responsive-type/tree/v0.3.1) (2015-09-15)
-[Full Changelog](https://github.com/seaneking/postcss-responsive-type/compare/v0.3.0...v0.3.1)
-
-## [v0.3.0](https://github.com/seaneking/postcss-responsive-type/tree/v0.3.0) (2015-09-06)
-[Full Changelog](https://github.com/seaneking/postcss-responsive-type/compare/v0.2.1...v0.3.0)
-
-**Closed issues:**
-
-- Move to PostCSS 5.0 [\#2](https://github.com/seaneking/postcss-responsive-type/issues/2)
-
-## [v0.2.1](https://github.com/seaneking/postcss-responsive-type/tree/v0.2.1) (2015-08-27)
-[Full Changelog](https://github.com/seaneking/postcss-responsive-type/compare/v0.2.0...v0.2.1)
-
-**Fixed bugs:**
-
-- Regression in IE with new sizing logic [\#3](https://github.com/seaneking/postcss-responsive-type/issues/3)
-
-## [v0.2.0](https://github.com/seaneking/postcss-responsive-type/tree/v0.2.0) (2015-08-21)
-[Full Changelog](https://github.com/seaneking/postcss-responsive-type/compare/v0.1.1...v0.2.0)
-
-**Closed issues:**
-
-- Support rem units [\#1](https://github.com/seaneking/postcss-responsive-type/issues/1)
-
-## [v0.1.1](https://github.com/seaneking/postcss-responsive-type/tree/v0.1.1) (2015-07-26)
-[Full Changelog](https://github.com/seaneking/postcss-responsive-type/compare/v0.1.0...v0.1.1)
-
-## [v0.1.0](https://github.com/seaneking/postcss-responsive-type/tree/v0.1.0) (2015-07-26)
-
-
-\* *This Change Log was automatically generated by [github_changelog_generator](https://github.com/skywinder/Github-Changelog-Generator)*
\ No newline at end of file
diff --git a/README.md b/README.md
index 7946144..375a397 100644
--- a/README.md
+++ b/README.md
@@ -1,50 +1,25 @@
-# PostCSS Responsive Type
-[![NPM version][npm-badge]][npm-url] [![NPM downloads][downloads-badge]][npm-url] [![Build Status][travis-badge]][travis-url]
+# postcss-responsive-type
+[![NPM version][npm-image]][npm-url] [![Build Status][travis-image]][travis-url] [![Dependency Status][daviddm-image]][daviddm-url]
 
-Generate automagical fluid typography, with new `responsive` properties for `font-size`, `line-height`, and `letter-spacing`. Built on [PostCSS][postcss].
+[PostCSS] plugin for automagical responsive typography. Adds a `responsive` property to `font-size` that generates complex `calc` and `vw` unit based font sizes.
 
-![Responsive Type Demo][demo]
-
-Inspired by [this post][post].
-
-_Part of [Rucksack - CSS Superpowers](https://github.com/madeleineostoja/rucksack)_
-
-### Contents
-
-- [Usage](#usage)
-  - [Quick start](#quick-start)
-  - [Specify parameters](#specify-parameters)
-  - [Expanded syntax](#expanded-syntax)
-  - [Responsive `line-height` and `letter-spacing`](#responsive-line-height-and-letter-spacing)
-- [Defaults](#defaults)
-- [Browser Support](#browser-support)
+Inspired by [Typographic][typographic].
 
-## Usage
-
-#### Quick start
+![Responsive Type Demo][demo]
 
 ```css
+/* Quick start */
 html {
   font-size: responsive;
 }
-```
-
-> **Pro tip:** set a reaponsive font-size on `html` and use `rem` units throughout your project to make your whole UI fluid
-
-#### Specify parameters
 
-Units can be in px, rem, or em. When using em units, be sure that the `font-range` is specified in em as well.
-
-```css
+/* Specify parameters */
 html {
   font-size: responsive 12px 21px; /* min-size, max-size */
   font-range: 420px 1280px; /* viewport widths between which font-size is fluid */
 }
-```
 
-#### Expanded syntax
-
-```css
+/* Expanded syntax */
 html {
   font-size: responsive;
   min-font-size: 12px;
@@ -54,99 +29,84 @@ html {
 }
 ```
 
-#### Responsive `line-height` and `letter-spacing`
-
-PostCSS Responsive Type also allows you to set fluid sizes for the `line-height` and `letter-spacing` properties. They have the same syntax and work the same way as responsive font sizes.
-
 ```css
 html {
-  line-height: responsive 1.2em 1.8em;
-  line-height-range: 420px 1280px;
-
-  /* or extended syntax: */
-  line-height: responsive;
-  min-line-height: 1.2em;
-  max-line-height: 1.8em;
-  lower-line-height-range: 420px;
-  upper-line-height-range: 1280px;
+  font-size: calc(12px + 9 * ((100vw - 420px) / 860));
 }
-```
 
-```css
-html {
-  letter-spacing: responsive 0px 4px;
-  letter-spacing-range: 420px 1280px;
-
-  /* or extended syntax: */
-  letter-spacing: responsive;
-  min-letter-spacing: 0px;
-  max-letter-spacing: 4px;
-  lower-letter-spacing-range: 420px;
-  upper-letter-spacing-range: 1280px;
+@media screen and (max-width: 420px) {
+  html {
+    font-size: 12px;
+  }
 }
-```
-
-> **Note:** Unitless line heights are not supported.
-
-## Defaults
-To get started you only need to specify the `responsive` property, all other values have sane defaults.
-
-##### `font-size`
-
-- `min-font-size`: 14px
 
-- `max-font-size`: 21px
+@media screen and (min-width: 1280px) {
+  html {
+    font-size: 21px;
+  }
+}
+```
 
-- `lower-font-range`: 420px
+--
 
-- `upper-font-range`: 1280px
+### Defaults
+To get started you only need to specify `font-size: responsive;`, all other properties have sane defaults.
 
+`min-font-size`: 14px
 
-##### `line-height`
+`max-font-size`: 21px
 
-- `min-line-height`: 1.2em
+`lower-font-range`: 420px
 
-- `max-line-height`: 1.8em
+`upper-font-range`: 1280px
 
-- `lower-line-height-range`: 420px
+--
 
-- `upper-line-height-range`: 1280px
+### Browser Support
+`postcss-responsive-type` just uses `calc`, `vw` units, and media queries behind the scenes, so it works on all modern browsers (IE9+). Although Opera Mini is not supported.
 
+Legacy browsers will ignore the `responsive` font-size. You can quite easily provide a simple static fallback:
 
-##### `letter-spacing`
+```css
+.foo {
+  font-size: 16px;
+  font-size: responsive;
+}
+```
 
-- `min-letter-spacing`: 0px
+Alternatively, if you feel the need to fully support legacy browsers or Opera Mini, there are polyfills that can help!
 
-- `max-letter-spacing`: 4px
+- [respond][respond] for media query support.
 
-- `lower-letter-spacing-range`: 420px
+- [calc-polyfill][calc-polyfill] for `calc` support.
 
-- `upper-letter-spacing-range`: 1280px
+- [vminpoly][vminpoly] for `vw` unit support.
 
+--
 
-## Browser Support
+### Usage
 
-`postcss-responsive-type` just uses calc, vw units, and media queries behind the scenes, so it works on all modern browsers (IE9+). Although Opera Mini is not supported.
+```js
+postcss([ require('postcss-responsive-type') ])
+```
 
-Legacy browsers will ignore the output `responsive` font-size. You can easily provide a simple static fallback:
+See [PostCSS] docs for examples for your environment.
 
-```css
-.foo {
-  font-size: 16px;
-  font-size: responsive;
-}
-```
+--
 
-***
+### License
 
 MIT © [Sean King](https://twitter.com/seaneking)
 
-[npm-badge]: https://img.shields.io/npm/v/postcss-responsive-type.svg
+[npm-image]: https://badge.fury.io/js/postcss-responsive-type.svg
 [npm-url]: https://npmjs.org/package/postcss-responsive-type
-[downloads-badge]: https://img.shields.io/npm/dm/postcss-responsive-type.svg
-[travis-badge]: https://travis-ci.org/seaneking/postcss-responsive-type.svg?branch=master
+[travis-image]: https://travis-ci.org/seaneking/postcss-responsive-type.svg?branch=master
 [travis-url]: https://travis-ci.org/seaneking/postcss-responsive-type
+[daviddm-image]: https://david-dm.org/seaneking/postcss-responsive-type.svg?theme=shields.io
+[daviddm-url]: https://david-dm.org/seaneking/postcss-responsive-type
 [PostCSS]: https://github.com/postcss/postcss
 [demo]: /demo.gif?raw=true
-[post]: http://madebymike.com.au/writing/precise-control-responsive-typography/
-[poststylus]: https://github.com/seaneking/poststylus
+[typographic]: https://github.com/corysimmons/typographic
+[calc-polyfill]: https://github.com/closingtag/calc-polyfill
+[respond]: https://github.com/scottjehl/Respond
+[vminpoly]: https://github.com/saabi/vminpoly
diff --git a/gulpfile.js b/gulpfile.js
new file mode 100644
index 0000000..c5c98fd
--- /dev/null
+++ b/gulpfile.js
@@ -0,0 +1,23 @@
+'use strict';
+
+var gulp = require('gulp'),
+    eslint = require('gulp-eslint'),
+    mocha = require('gulp-mocha');
+
+gulp.task('lint', function () {
+  return gulp.src(['index.js', 'test/*.js', 'gulpfile.js'])
+    .pipe(eslint())
+    .pipe(eslint.format())
+    .pipe(eslint.failAfterError());
+});
+
+gulp.task('test', function () {
+  return gulp.src('test/*.js', { read: false }).pipe(mocha({reporter: 'nyan'}));
+});
+
+gulp.task('watch', function() {
+  gulp.watch('**/*.js', ['check'] );
+});
+
+gulp.task('check', ['lint', 'test']);
+gulp.task('default', ['check', 'watch']);
diff --git a/index.js b/index.js
index 6d127f5..3b7ee85 100644
--- a/index.js
+++ b/index.js
@@ -1,245 +1,155 @@
 'use strict';
 
-const postcss = require('postcss');
-
-const DEFAULT_PARAMS = {
-      'font-size': {
-        minSize: '12px',
-        maxSize: '21px',
-        minWidth: '420px',
-        maxWidth: '1280px'
-      },
-      'line-height': {
-        minSize: '1.2em',
-        maxSize: '1.8em',
-        minWidth: '420px',
-        maxWidth: '1280px'
-      },
-      'letter-spacing': {
-        minSize: '0px',
-        maxSize: '4px',
-        minWidth: '420px',
-        maxWidth: '1280px'
-      }
-    },
-    PARAM_RANGE = {
-      'font-size': 'font-range',
-      'line-height': 'line-height-range',
-      'letter-spacing': 'letter-spacing-range'
-    },
-    PARAM_DECLS = {
-      'font-size': {
-        minSize: 'min-font-size',
-        maxSize: 'max-font-size',
-        minWidth: 'lower-font-range',
-        maxWidth: 'upper-font-range'
-      },
-      'line-height': {
-        minSize: 'min-line-height',
-        maxSize: 'max-line-height',
-        minWidth: 'lower-line-height-range',
-        maxWidth: 'upper-line-height-range'
-      },
-      'letter-spacing': {
-        minSize: 'min-letter-spacing',
-        maxSize: 'max-letter-spacing',
-        minWidth: 'lower-letter-spacing-range',
-        maxWidth: 'upper-letter-spacing-range'
-      }
-    };
-
-// Assign default root size
-let rootSize = '16px';
-
-/**
- * Extract the unit from a string
- * @param  {String} value value to extract unit from
- * @return {String}       unit
- */
-function getUnit(value) {
-  var match = value.match(/px|rem|em/);
-
-  if (match) {
-    return match.toString();
-  }
-  return null;
-}
-
-/**
- * Px -> Rem converter
- * @param  {String} px pixel value
- * @return {String}    rem value
- */
-function pxToRem(px) {
-  return parseFloat(px) / parseFloat(rootSize) + 'rem';
-}
-
-function fetchResponsiveSizes(rule, declName, cb) {
-  rule.walkDecls(declName, decl => {
-
-    if (decl.value.indexOf('responsive') > -1) {
-      let vals = decl.value.match(/-?\d*\.?\d+(?:\w+)?/g);
-
-      if (vals) {
-        cb(vals[0], vals[1]);
+var postcss = require('postcss');
+
+module.exports = postcss.plugin('postcss-responsive-type', function () {
+
+  // Default parameters
+  var params = {
+    minSize: '12px',
+    maxSize: '21px',
+    minWidth: '420px',
+    maxWidth: '1280px',
+    rootSize: '16px'
+  };
+
+  // Map expanded declarations to params
+  var paramDecls = {
+    minSize: 'min-font-size',
+    maxSize: 'max-font-size',
+    minWidth: 'lower-font-range',
+    maxWidth: 'upper-font-range'
+  };
+
+  /**
+   * Fetch plugin parameters from css rules
+   * @param  {object} rule CSS rule to parse
+   */
+  var fetchParams = function(rule){
+
+    // Fetch params from shorthand font-size
+    rule.eachDecl('font-size', function(decl){
+
+      if (decl.value.indexOf('responsive') > -1) {
+        var vals = decl.value.match(/([0-9]+\w*)/g);
+
+        if (vals){
+          params.minSize = vals[0];
+          params.maxSize = vals[1];
+        }
       }
+
+    });
+
+    // Fetch params from shorthand font-range
+    rule.eachDecl('font-range', function(decl){
+      var vals = decl.value.split(/\s+/);
+      params.minWidth = vals[0];
+      params.maxWidth = vals[1];
+      decl.removeSelf();
+    });
+
+    // Fetch parameters from expanded properties
+    Object.keys(paramDecls).forEach(function(param){
+      rule.eachDecl(paramDecls[param], function(decl){
+        params[param] = decl.value;
+        decl.removeSelf();
+      });
+    });
+
+    // Check root font-size (for rem units)
+    if (rule.selector === 'html'){
+      rule.eachDecl('font-size', function(decl){
+        params.rootSize = decl.value;
+      });
     }
-  });
-}
-
-function fetchRangeSizes(rule, declName, cb) {
-  rule.walkDecls(declName, decl => {
-    let vals = decl.value.split(/\s+/);
-
-    cb(vals[0], vals[1]);
-    decl.remove();
-  });
-}
-
-function fetchParams(rule, declName) {
-  let params = Object.assign({}, DEFAULT_PARAMS[declName]),
-      rangeDecl;
-
-  // Fetch params from shorthand declName, i.e., font-size or line-height, etc
-  fetchResponsiveSizes(rule, declName, (minSize, maxSize) => {
-    params.minSize = minSize;
-    params.maxSize = maxSize;
-  });
-
-  // Fetch params from shorthand font-range or line-height-range
-  fetchRangeSizes(rule, PARAM_RANGE[declName], (minSize, maxSize) => {
-    params.minWidth = minSize;
-    params.maxWidth = maxSize;
-  });
-
-  // Fetch parameters from expanded properties
-  rangeDecl = PARAM_DECLS[declName];
-
-  Object.keys(rangeDecl).forEach(param => {
-    rule.walkDecls(rangeDecl[param], decl => {
-      params[param] = decl.value.trim();
-      decl.remove();
+
+  };
+
+  /**
+   * Build new responsive type rules
+   * @param  {object} rule     old CSS rule
+   * @param  {object} newRules object to store new CSS rules
+   * @return {object}          object of new CSS rules
+   */
+  var buildRules = function(rule, newRules) {
+
+    // Build the responsive decleration
+    var sizeDiff = parseFloat(params.maxSize) - parseFloat(params.minSize),
+        widthDiff = parseFloat(params.maxWidth) - parseFloat(params.minWidth);
+
+    newRules.responsive = 'calc(' + params.minSize + ' + ' + sizeDiff.toString() + ' * ((100vw - ' + params.minWidth + ') / ' + widthDiff.toString() + '))';
+
+    // Build the media queries
+    newRules.minMedia = postcss.atRule({
+      name: 'media',
+      params: 'screen and (max-width: ' + params.minWidth + ')',
+      before: '\n'
     });
-  });
-
-  return params;
-}
-
-/**
- * Build new responsive type rules
- * @param  {object} rule     old CSS rule
- * @return {object}          object of new CSS rules
- */
-function buildRules(rule, declName, params, result) {
-  let rules = {},
-      minSize = params.minSize,
-      maxSize = params.maxSize,
-      minWidth,
-      maxWidth,
-      sizeUnit = getUnit(params.minSize),
-      maxSizeUnit = getUnit(params.maxSize),
-      widthUnit = getUnit(params.minWidth),
-      maxWidthUnit = getUnit(params.maxWidth),
-      sizeDiff,
-      rangeDiff;
-
-  if (sizeUnit === null) {
-    throw rule.error('sizes with unitless values are not supported');
-  }
-
-  if (sizeUnit !== maxSizeUnit && widthUnit !== maxWidthUnit) {
-    rule.warn(result, 'min/max unit types must match');
-  }
-
-  if (sizeUnit === 'rem' && widthUnit === 'px') {
-    minWidth = pxToRem(params.minWidth);
-    maxWidth = pxToRem(params.maxWidth);
-  } else if (sizeUnit === widthUnit || sizeUnit === 'rem' && widthUnit === 'em') {
-    minWidth = params.minWidth;
-    maxWidth = params.maxWidth;
-  } else {
-    rule.warn(result, 'this combination of units is not supported');
-  }
-
-  // Build the responsive type decleration
-  sizeDiff = parseFloat(maxSize) - parseFloat(minSize);
-  rangeDiff = parseFloat(maxWidth) - parseFloat(minWidth);
-
-  rules.responsive = 'calc(' + minSize + ' + ' + sizeDiff + ' * ((100vw - ' + minWidth + ') / ' + rangeDiff + '))';
-
-  // Build the media queries
-  rules.minMedia = postcss.atRule({
-    name: 'media',
-    params: 'screen and (max-width: ' + params.minWidth + ')'
-  });
-
-  rules.maxMedia = postcss.atRule({
-    name: 'media',
-    params: 'screen and (min-width: ' + params.maxWidth + ')'
-  });
-
-  // Add the required content to new media queries
-  rules.minMedia.append({
-    selector: rule.selector
-  }).walkRules(selector => {
-    selector.append({
-      prop: declName,
-      value: params.minSize
+
+    newRules.maxMedia = postcss.atRule({
+      name: 'media',
+      params: 'screen and (min-width: ' + params.maxWidth + ')',
+      before: '\n'
     });
-  });
-
-  rules.maxMedia.append({
-    selector: rule.selector
-  }).walkRules(selector => {
-    selector.append({
-      prop: declName,
-      value: params.maxSize
+
+    // Add the required content to new media queries
+    newRules.minMedia.append({
+        selector: rule.selector
+    }).eachRule(function(selector){
+      selector.append({
+        prop: 'font-size',
+        value: params.minSize
+      });
+    });
+
+    newRules.maxMedia.append({
+      selector: rule.selector
+    }).eachRule(function(selector){
+      selector.append({
+        prop: 'font-size',
+        value: params.maxSize
+      });
     });
-  });
-
-  return rules;
-}
-
-const plugin = () => ({
-  postcssPlugin: 'postcss-responsive-type',
-  Once(root, { result }) {
-    root.walkRules(function (rule) {
-      let thisRule, newRules;
-
-      // Check root font-size (for rem units)
-      if (rule.selector.indexOf('html') > -1) {
-        rule.walkDecls('font-size', decl => {
-          if (decl.value.indexOf('px') > -1) {
-            rootSize = decl.value;
-          }
-        });
-      }
 
-      rule.walkDecls(/^(font-size|line-height|letter-spacing)$/, decl => {
-        let params;
+    return newRules;
+  };
 
-        // If decl doesn't contain responsve keyword, exit
-        if (decl.value.indexOf('responsive') === -1) {
+  // Do it!
+  return function (css) {
+    css.eachRule(function(rule){
+
+      var thisRule,
+          newRules = {};
+
+      rule.eachDecl('font-size', function(decl){
+
+        // If rule doesn't contain responsve keyword, exit
+        if (!decl.value.indexOf('responsive') > -1) {
           return;
         }
 
+        // Otherwise store the rul in a var
         thisRule = decl.parent;
-        params = fetchParams(thisRule, decl.prop);
-        newRules = buildRules(thisRule, decl.prop, params, result);
 
-        // Insert the base responsive decleration
+      });
+
+      fetchParams(rule);
+
+      buildRules(rule, newRules);
+
+      // Insert the base responsive decleration
+      rule.eachDecl('font-size', function(decl){
         if (decl.value.indexOf('responsive') > -1) {
-          decl.replaceWith({ prop: decl.prop, value: newRules.responsive });
+          decl.replaceWith({prop: decl.prop, value: newRules.responsive });
         }
-
-        // Insert the media queries
-        thisRule.parent.insertAfter(thisRule, newRules.minMedia);
-        thisRule.parent.insertAfter(thisRule, newRules.maxMedia);
       });
-    });
-  }
-});
 
-plugin.postcss = true;
+      // Insert the media queries
+      rule.parent.insertAfter(thisRule, newRules.minMedia);
+      rule.parent.insertAfter(newRules.minMedia, newRules.maxMedia);
+
+    });
+  };
 
-module.exports = plugin;
\ No newline at end of file
+});
diff --git a/package.json b/package.json
index 963a06c..75bec03 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "postcss-responsive-type",
-  "version": "1.0.0",
+  "version": "0.1.0",
   "description": "PostCSS plugin that adds responsive magic to font-size",
   "keywords": [
     "postcss",
@@ -25,17 +25,16 @@
     "url": "https://github.com/seaneking/postcss-responsive-type/issues"
   },
   "homepage": "https://github.com/seaneking/postcss-responsive-type",
-  "devDependencies": {
-    "chai": "^4.0.2",
-    "eslint": "^4.1.1",
-    "mocha": "^3.4.2",
-    "postcss": "^8.4.6"
+  "dependencies": {
+    "postcss": "^4.1.9"
   },
-  "peerDependencies": {
-    "postcss": "^8.4.6"
+  "devDependencies": {
+    "gulp-eslint": "^0.12.0",
+    "gulp-mocha": "^2.0.1",
+    "chai": "^2.3.0",
+    "gulp": "^3.8.11"
   },
   "scripts": {
-    "test": "mocha test",
-    "posttest": "eslint ."
+    "test": "gulp check"
   }
 }
diff --git a/test/fixtures/custom.expected.css b/test/fixtures/custom.expected.css
index e4569d0..c90cab6 100644
--- a/test/fixtures/custom.expected.css
+++ b/test/fixtures/custom.expected.css
@@ -1,13 +1,13 @@
-.foo {
-  font-size: calc(10px + 20 * ((100vw - 300px) / 600));
-}
-@media screen and (min-width: 900px) {
+
+@media screen and (max-width: 300px) {
   .foo {
-    font-size: 30px;
+    font-size: 10px;
   }
 }
-@media screen and (max-width: 300px) {
+@media screen and (min-width: 900px) {
   .foo {
-    font-size: 10px;
+    font-size: 30px;
   }
+}.foo {
+  font-size: calc(10px + 20 * ((100vw - 300px) / 600));
 }
diff --git a/test/fixtures/default.css b/test/fixtures/default.css
index a696588..16bfcf2 100644
--- a/test/fixtures/default.css
+++ b/test/fixtures/default.css
@@ -1,7 +1,3 @@
 .foo {
   font-size: responsive;
 }
-
-.bar {
-  foo: bar;
-}
diff --git a/test/fixtures/default.expected.css b/test/fixtures/default.expected.css
index ae59477..0158549 100644
--- a/test/fixtures/default.expected.css
+++ b/test/fixtures/default.expected.css
@@ -1,21 +1,13 @@
-.foo {
-  font-size: calc(12px + 9 * ((100vw - 420px) / 860));
-}
-
-@media screen and (min-width: 1280px) {
-
-  .foo {
-    font-size: 21px;
-  }
-}
 
 @media screen and (max-width: 420px) {
-
   .foo {
     font-size: 12px;
   }
 }
-
-.bar {
-  foo: bar;
+@media screen and (min-width: 1280px) {
+  .foo {
+    font-size: 21px;
+  }
+}.foo {
+  font-size: calc(12px + 9 * ((100vw - 420px) / 860));
 }
diff --git a/test/fixtures/em.css b/test/fixtures/em.css
deleted file mode 100644
index 57a4f60..0000000
--- a/test/fixtures/em.css
+++ /dev/null
@@ -1,4 +0,0 @@
-.foo {
-  font-size: responsive 1em 3em;
-  font-range: 20em 45em;
-}
diff --git a/test/fixtures/em.expected.css b/test/fixtures/em.expected.css
deleted file mode 100644
index 73e62f9..0000000
--- a/test/fixtures/em.expected.css
+++ /dev/null
@@ -1,13 +0,0 @@
-.foo {
-  font-size: calc(1em + 2 * ((100vw - 20em) / 25));
-}
-@media screen and (min-width: 45em) {
-  .foo {
-    font-size: 3em;
-  }
-}
-@media screen and (max-width: 20em) {
-  .foo {
-    font-size: 1em;
-  }
-}
diff --git a/test/fixtures/fallback.expected.css b/test/fixtures/fallback.expected.css
index 61d5a6a..4567af4 100644
--- a/test/fixtures/fallback.expected.css
+++ b/test/fixtures/fallback.expected.css
@@ -1,14 +1,14 @@
-.foo {
-  font-size: 16px;
-  font-size: calc(12px + 9 * ((100vw - 420px) / 860));
-}
-@media screen and (min-width: 1280px) {
+
+@media screen and (max-width: 420px) {
   .foo {
-    font-size: 21px;
+    font-size: 12px;
   }
 }
-@media screen and (max-width: 420px) {
+@media screen and (min-width: 1280px) {
   .foo {
-    font-size: 12px;
+    font-size: 21px;
   }
+}.foo {
+  font-size: 16px;
+  font-size: calc(12px + 9 * ((100vw - 420px) / 860));
 }
diff --git a/test/fixtures/formatting.css b/test/fixtures/formatting.css
deleted file mode 100644
index 104954b..0000000
--- a/test/fixtures/formatting.css
+++ /dev/null
@@ -1,5 +0,0 @@
-.foo {
-  font-size:responsive 10px  30px ;
-  lower-font-range:  300px ;
-  upper-font-range:900px;
-}
diff --git a/test/fixtures/formatting.expected.css b/test/fixtures/formatting.expected.css
deleted file mode 100644
index e4569d0..0000000
--- a/test/fixtures/formatting.expected.css
+++ /dev/null
@@ -1,13 +0,0 @@
-.foo {
-  font-size: calc(10px + 20 * ((100vw - 300px) / 600));
-}
-@media screen and (min-width: 900px) {
-  .foo {
-    font-size: 30px;
-  }
-}
-@media screen and (max-width: 300px) {
-  .foo {
-    font-size: 10px;
-  }
-}
diff --git a/test/fixtures/letterspacing.css b/test/fixtures/letterspacing.css
deleted file mode 100644
index 65118af..0000000
--- a/test/fixtures/letterspacing.css
+++ /dev/null
@@ -1,4 +0,0 @@
-.foo {
-  letter-spacing: responsive 10px 30px;
-  letter-spacing-range: 300px 900px;
-}
diff --git a/test/fixtures/letterspacing.expected.css b/test/fixtures/letterspacing.expected.css
deleted file mode 100644
index 7ce0127..0000000
--- a/test/fixtures/letterspacing.expected.css
+++ /dev/null
@@ -1,13 +0,0 @@
-.foo {
-  letter-spacing: calc(10px + 20 * ((100vw - 300px) / 600));
-}
-@media screen and (min-width: 900px) {
-  .foo {
-    letter-spacing: 30px;
-  }
-}
-@media screen and (max-width: 300px) {
-  .foo {
-    letter-spacing: 10px;
-  }
-}
diff --git a/test/fixtures/letterspacing_extended.css b/test/fixtures/letterspacing_extended.css
deleted file mode 100644
index 6b245ff..0000000
--- a/test/fixtures/letterspacing_extended.css
+++ /dev/null
@@ -1,6 +0,0 @@
-.foo {
-  letter-spacing: responsive;
-  min-letter-spacing: 10px;
-  max-letter-spacing: 30px;
-  letter-spacing-range: 300px 900px;
-}
diff --git a/test/fixtures/letterspacing_extended.expected.css b/test/fixtures/letterspacing_extended.expected.css
deleted file mode 100644
index 7ce0127..0000000
--- a/test/fixtures/letterspacing_extended.expected.css
+++ /dev/null
@@ -1,13 +0,0 @@
-.foo {
-  letter-spacing: calc(10px + 20 * ((100vw - 300px) / 600));
-}
-@media screen and (min-width: 900px) {
-  .foo {
-    letter-spacing: 30px;
-  }
-}
-@media screen and (max-width: 300px) {
-  .foo {
-    letter-spacing: 10px;
-  }
-}
diff --git a/test/fixtures/letterspacing_negative.css b/test/fixtures/letterspacing_negative.css
deleted file mode 100644
index bed90c6..0000000
--- a/test/fixtures/letterspacing_negative.css
+++ /dev/null
@@ -1,4 +0,0 @@
-.foo {
-  letter-spacing: responsive -10px -30px;
-  letter-spacing-range: 300px 900px;
-}
diff --git a/test/fixtures/letterspacing_negative.expected.css b/test/fixtures/letterspacing_negative.expected.css
deleted file mode 100644
index 9e3511b..0000000
--- a/test/fixtures/letterspacing_negative.expected.css
+++ /dev/null
@@ -1,13 +0,0 @@
-.foo {
-  letter-spacing: calc(-10px + -20 * ((100vw - 300px) / 600));
-}
-@media screen and (min-width: 900px) {
-  .foo {
-    letter-spacing: -30px;
-  }
-}
-@media screen and (max-width: 300px) {
-  .foo {
-    letter-spacing: -10px;
-  }
-}
diff --git a/test/fixtures/lineheight.css b/test/fixtures/lineheight.css
deleted file mode 100644
index 188376d..0000000
--- a/test/fixtures/lineheight.css
+++ /dev/null
@@ -1,4 +0,0 @@
-.foo {
-  line-height: responsive 10px 30px;
-  line-height-range: 300px 900px;
-}
diff --git a/test/fixtures/lineheight.expected.css b/test/fixtures/lineheight.expected.css
deleted file mode 100644
index 368dcb5..0000000
--- a/test/fixtures/lineheight.expected.css
+++ /dev/null
@@ -1,13 +0,0 @@
-.foo {
-  line-height: calc(10px + 20 * ((100vw - 300px) / 600));
-}
-@media screen and (min-width: 900px) {
-  .foo {
-    line-height: 30px;
-  }
-}
-@media screen and (max-width: 300px) {
-  .foo {
-    line-height: 10px;
-  }
-}
diff --git a/test/fixtures/lineheight_extended.css b/test/fixtures/lineheight_extended.css
deleted file mode 100644
index c87d2c2..0000000
--- a/test/fixtures/lineheight_extended.css
+++ /dev/null
@@ -1,6 +0,0 @@
-.foo {
-  line-height: responsive;
-  min-line-height: 10px;
-  max-line-height: 30px;
-  line-height-range: 300px 900px;
-}
diff --git a/test/fixtures/lineheight_extended.expected.css b/test/fixtures/lineheight_extended.expected.css
deleted file mode 100644
index 368dcb5..0000000
--- a/test/fixtures/lineheight_extended.expected.css
+++ /dev/null
@@ -1,13 +0,0 @@
-.foo {
-  line-height: calc(10px + 20 * ((100vw - 300px) / 600));
-}
-@media screen and (min-width: 900px) {
-  .foo {
-    line-height: 30px;
-  }
-}
-@media screen and (max-width: 300px) {
-  .foo {
-    line-height: 10px;
-  }
-}
diff --git a/test/fixtures/mixed.css b/test/fixtures/mixed.css
deleted file mode 100644
index 129c658..0000000
--- a/test/fixtures/mixed.css
+++ /dev/null
@@ -1,14 +0,0 @@
-.foo {
-  font-size: responsive 1rem 3rem;
-  font-range: 420px 1280px;
-}
-
-.bar {
-  font-size: responsive 1rem 3rem;
-  font-range: 20em 60em;
-}
-
-.baz {
-  font-size: responsive 1em 3em;
-  font-range: 420px 1280px;
-}
diff --git a/test/fixtures/mixed.expected.css b/test/fixtures/mixed.expected.css
deleted file mode 100644
index 97a2be7..0000000
--- a/test/fixtures/mixed.expected.css
+++ /dev/null
@@ -1,53 +0,0 @@
-.foo {
-  font-size: calc(1rem + 2 * ((100vw - 26.25rem) / 53.75));
-}
-
-@media screen and (min-width: 1280px) {
-
-  .foo {
-    font-size: 3rem;
-  }
-}
-
-@media screen and (max-width: 420px) {
-
-  .foo {
-    font-size: 1rem;
-  }
-}
-
-.bar {
-  font-size: calc(1rem + 2 * ((100vw - 20em) / 40));
-}
-
-@media screen and (min-width: 60em) {
-
-  .bar {
-    font-size: 3rem;
-  }
-}
-
-@media screen and (max-width: 20em) {
-
-  .bar {
-    font-size: 1rem;
-  }
-}
-
-.baz {
-  font-size: calc(1em + 2 * ((100vw - undefined) / NaN));
-}
-
-@media screen and (min-width: 1280px) {
-
-  .baz {
-    font-size: 3em;
-  }
-}
-
-@media screen and (max-width: 420px) {
-
-  .baz {
-    font-size: 1em;
-  }
-}
diff --git a/test/fixtures/rem.css b/test/fixtures/rem.css
new file mode 100644
index 0000000..048d9db
--- /dev/null
+++ b/test/fixtures/rem.css
@@ -0,0 +1,7 @@
+html {
+  font-size: 10px;
+}
+
+.foo {
+  font-size: responsive 1.2rem 2.1rem;
+}
diff --git a/test/fixtures/root.expected.css b/test/fixtures/rem.expected.css
similarity index 55%
rename from test/fixtures/root.expected.css
rename to test/fixtures/rem.expected.css
index e5cd1a8..8e2a7bb 100644
--- a/test/fixtures/root.expected.css
+++ b/test/fixtures/rem.expected.css
@@ -3,19 +3,17 @@ html {
 }
 
 .foo {
-  font-size: calc(1.6rem + 3.1999999999999997 * ((100vw - 42rem) / 86));
+  font-size: calc(1.2rem + 9 * ((100vw - 420px) / 860));
 }
 
-@media screen and (min-width: 1280px) {
-
+@media screen and (max-width: 420px) {
   .foo {
-    font-size: 4.8rem;
+    font-size: 1.2rem;
   }
 }
 
-@media screen and (max-width: 420px) {
-
+@media screen and (min-width: 1280px) {
   .foo {
-    font-size: 1.6rem;
+    font-size: 2.1rem;
   }
 }
diff --git a/test/fixtures/root.css b/test/fixtures/root.css
deleted file mode 100644
index 46569b4..0000000
--- a/test/fixtures/root.css
+++ /dev/null
@@ -1,8 +0,0 @@
-html {
-  font-size: 10px;
-}
-
-.foo {
-  font-size: responsive 1.6rem 4.8rem;
-  font-range: 420px 1280px;
-}
diff --git a/test/fixtures/shorthand.expected.css b/test/fixtures/shorthand.expected.css
index e4569d0..c90cab6 100644
--- a/test/fixtures/shorthand.expected.css
+++ b/test/fixtures/shorthand.expected.css
@@ -1,13 +1,13 @@
-.foo {
-  font-size: calc(10px + 20 * ((100vw - 300px) / 600));
-}
-@media screen and (min-width: 900px) {
+
+@media screen and (max-width: 300px) {
   .foo {
-    font-size: 30px;
+    font-size: 10px;
   }
 }
-@media screen and (max-width: 300px) {
+@media screen and (min-width: 900px) {
   .foo {
-    font-size: 10px;
+    font-size: 30px;
   }
+}.foo {
+  font-size: calc(10px + 20 * ((100vw - 300px) / 600));
 }
diff --git a/test/fixtures/unitless_lineheight.css b/test/fixtures/unitless_lineheight.css
deleted file mode 100644
index 2c958d0..0000000
--- a/test/fixtures/unitless_lineheight.css
+++ /dev/null
@@ -1,3 +0,0 @@
-.foo {
-  line-height: responsive 1.5 2;
-}
diff --git a/test/fixtures/unitless_lineheight.expected.css b/test/fixtures/unitless_lineheight.expected.css
deleted file mode 100644
index 8a84350..0000000
--- a/test/fixtures/unitless_lineheight.expected.css
+++ /dev/null
@@ -1,13 +0,0 @@
-.foo {
-  line-height: calc(1.5 + 0.5 * ((100vw - undefined) / NaN));
-}
-@media screen and (min-width: 1280px) {
-  .foo {
-    line-height: 2;
-  }
-}
-@media screen and (max-width: 420px) {
-  .foo {
-    line-height: 1.5;
-  }
-}
diff --git a/test/mocha.opts b/test/mocha.opts
deleted file mode 100644
index d9a95e8..0000000
--- a/test/mocha.opts
+++ /dev/null
@@ -1 +0,0 @@
---reporter nyan
diff --git a/test/test.js b/test/test.js
index 57087fa..89ceab5 100644
--- a/test/test.js
+++ b/test/test.js
@@ -1,17 +1,14 @@
+/*eslint no-unused-expressions: 0, block-scoped-var: 0, no-undef: 0*/
 'use strict';
 
-const postcss = require('postcss');
-const expect = require('chai').expect;
-const fs = require('fs');
-const path = require('path');
-const plugin = require('../');
+var postcss = require('postcss'),
+    expect = require('chai').expect,
+    fs = require('fs'),
+    path = require('path'),
+    plugin = require('../');
 
-function compareWarnings(warnings, expected) {
-  warnings.forEach((warning, i) => expect(warning).to.contain(expected[i]));
-}
-
-function test(fixture, opts, warnings, done) {
-  let input = fixture + '.css',
+var test = function (fixture, opts, done) {
+  var input = fixture + '.css',
       expected = fixture + '.expected.css';
 
   input = fs.readFileSync(path.join(__dirname, 'fixtures', input), 'utf8');
@@ -19,70 +16,36 @@ function test(fixture, opts, warnings, done) {
 
   postcss([ plugin(opts) ])
     .process(input)
-    .then(result => {
+    .then(function (result) {
       expect(result.css).to.eql(expected);
-
-      if (warnings.length > 0) {
-        compareWarnings(result.warnings(), warnings);
-      } else {
-        expect(result.warnings()).to.be.empty;
-      }
-
-      done();
-    }).catch(done);
-}
-
-describe('postcss-responsive-type', () => {
-
-  it('builds responsive type with defaults', done => test('default', {}, [], done));
-
-  it('applies custom parameters', done => test('custom', {}, [], done));
-
-  it('works with shorthand properties', done => test('shorthand', {}, [], done));
-
-  it('handles mixed units', done => {
-    test('mixed', {}, [{
-      type: 'warning',
-      text: 'this combination of units is not supported',
-      line: 11,
-      column: 1
-    }], done);
+      expect(result.warnings()).to.be.empty;
+    done();
+  }).catch(function (error) {
+    done(error);
   });
 
-  it('handles em units', done => test('em', {}, [], done));
+};
 
-  it('properly calculates rem from root font size', done => test('root', {}, [], done));
+describe('postcss-responsive-type', function () {
 
-  it('doesn\'t kill fallbacks/duplicate properties', done => test('fallback', {}, [], done));
-
-  it('sanitizes inputs', done => test('formatting', {}, [], done));
-
-  describe('line height', () => {
-    it('sets responsive line-height', done => test('lineheight', {}, [], done));
-
-    it('sets responsive line-height with extended syntax', done => test('lineheight_extended', {}, [], done));
-
-    it('warns about responsive unitless line-height', done => {
-      test('unitless_lineheight', {}, [], error => {
-        expect(error).to.contain({
-          name: 'CssSyntaxError',
-          reason: 'sizes with unitless values are not supported',
-          plugin: 'postcss-responsive-type',
-          source: '.foo {\n  line-height: responsive 1.5 2;\n}\n',
-          line: 1,
-          column: 1
-        });
+  it('builds responsive type with defaults', function (done) {
+   test('default', {}, done);
+  });
 
-        done();
-      });
-    });
+  it('applies custom parameters', function (done) {
+   test('custom', {}, done);
   });
 
-  describe('letterspacing', () => {
-    it('sets responsive letterspacing', done => test('letterspacing', {}, [], done));
+  it('works with shorthand properties', function (done) {
+   test('shorthand', {}, done);
+  });
 
-    it('sets responsive letterspacing with extended syntax', done => test('letterspacing_extended', {}, [], done));
+  it('doesn\'t kill fallbacks/duplicate properties', function (done) {
+   test('fallback', {}, done);
+  });
 
-    it('sets responsive letterspacing with negative values', done => test('letterspacing_negative', {}, [], done));
+  it('works with rem units', function (done) {
+   test('rem', {}, done);
   });
+
 });
diff --git a/yarn.lock b/yarn.lock
deleted file mode 100644
index eeb9c2a..0000000
--- a/yarn.lock
+++ /dev/null
@@ -1,972 +0,0 @@
-# THIS IS AN AUTOGENERATED FILE. DO NOT EDIT THIS FILE DIRECTLY.
-# yarn lockfile v1
-
-
-acorn-jsx@^3.0.0:
-  version "3.0.1"
-  resolved "https://registry.yarnpkg.com/acorn-jsx/-/acorn-jsx-3.0.1.tgz#afdf9488fb1ecefc8348f6fb22f464e32a58b36b"
-  dependencies:
-    acorn "^3.0.4"
-
-acorn@^3.0.4:
-  version "3.3.0"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-3.3.0.tgz#45e37fb39e8da3f25baee3ff5369e2bb5f22017a"
-
-acorn@^5.0.1:
-  version "5.1.1"
-  resolved "https://registry.yarnpkg.com/acorn/-/acorn-5.1.1.tgz#53fe161111f912ab999ee887a90a0bc52822fd75"
-
-ajv-keywords@^1.0.0:
-  version "1.5.1"
-  resolved "https://registry.yarnpkg.com/ajv-keywords/-/ajv-keywords-1.5.1.tgz#314dd0a4b3368fad3dfcdc54ede6171b886daf3c"
-
-ajv@^4.7.0:
-  version "4.11.8"
-  resolved "https://registry.yarnpkg.com/ajv/-/ajv-4.11.8.tgz#82ffb02b29e662ae53bdc20af15947706739c536"
-  dependencies:
-    co "^4.6.0"
-    json-stable-stringify "^1.0.1"
-
-ajv@^5.2.0:
-  version "5.2.2"
-  resolved "https://registry.yarnpkg.com/ajv/-/ajv-5.2.2.tgz#47c68d69e86f5d953103b0074a9430dc63da5e39"
-  dependencies:
-    co "^4.6.0"
-    fast-deep-equal "^1.0.0"
-    json-schema-traverse "^0.3.0"
-    json-stable-stringify "^1.0.1"
-
-ansi-escapes@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/ansi-escapes/-/ansi-escapes-2.0.0.tgz#5bae52be424878dd9783e8910e3fc2922e83c81b"
-
-ansi-regex@^2.0.0:
-  version "2.1.1"
-  resolved "https://registry.yarnpkg.com/ansi-regex/-/ansi-regex-2.1.1.tgz#c3b33ab5ee360d86e0e628f0468ae7ef27d654df"
-
-ansi-regex@^3.0.0:
-  version "3.0.0"
-  resolved "https://registry.yarnpkg.com/ansi-regex/-/ansi-regex-3.0.0.tgz#ed0317c322064f79466c02966bddb605ab37d998"
-
-ansi-styles@^2.2.1:
-  version "2.2.1"
-  resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-2.2.1.tgz#b432dd3358b634cf75e1e4664368240533c1ddbe"
-
-ansi-styles@^3.1.0:
-  version "3.2.0"
-  resolved "https://registry.yarnpkg.com/ansi-styles/-/ansi-styles-3.2.0.tgz#c159b8d5be0f9e5a6f346dab94f16ce022161b88"
-  dependencies:
-    color-convert "^1.9.0"
-
-argparse@^1.0.7:
-  version "1.0.9"
-  resolved "https://registry.yarnpkg.com/argparse/-/argparse-1.0.9.tgz#73d83bc263f86e97f8cc4f6bae1b0e90a7d22c86"
-  dependencies:
-    sprintf-js "~1.0.2"
-
-array-union@^1.0.1:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/array-union/-/array-union-1.0.2.tgz#9a34410e4f4e3da23dea375be5be70f24778ec39"
-  dependencies:
-    array-uniq "^1.0.1"
-
-array-uniq@^1.0.1:
-  version "1.0.3"
-  resolved "https://registry.yarnpkg.com/array-uniq/-/array-uniq-1.0.3.tgz#af6ac877a25cc7f74e058894753858dfdb24fdb6"
-
-arrify@^1.0.0:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/arrify/-/arrify-1.0.1.tgz#898508da2226f380df904728456849c1501a4b0d"
-
-assertion-error@^1.0.1:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/assertion-error/-/assertion-error-1.0.2.tgz#13ca515d86206da0bac66e834dd397d87581094c"
-
-babel-code-frame@^6.22.0:
-  version "6.22.0"
-  resolved "https://registry.yarnpkg.com/babel-code-frame/-/babel-code-frame-6.22.0.tgz#027620bee567a88c32561574e7fd0801d33118e4"
-  dependencies:
-    chalk "^1.1.0"
-    esutils "^2.0.2"
-    js-tokens "^3.0.0"
-
-balanced-match@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/balanced-match/-/balanced-match-1.0.0.tgz#89b4d199ab2bee49de164ea02b89ce462d71b767"
-
-brace-expansion@^1.1.7:
-  version "1.1.8"
-  resolved "https://registry.yarnpkg.com/brace-expansion/-/brace-expansion-1.1.8.tgz#c07b211c7c952ec1f8efd51a77ef0d1d3990a292"
-  dependencies:
-    balanced-match "^1.0.0"
-    concat-map "0.0.1"
-
-browser-stdout@1.3.0:
-  version "1.3.0"
-  resolved "https://registry.yarnpkg.com/browser-stdout/-/browser-stdout-1.3.0.tgz#f351d32969d32fa5d7a5567154263d928ae3bd1f"
-
-caller-path@^0.1.0:
-  version "0.1.0"
-  resolved "https://registry.yarnpkg.com/caller-path/-/caller-path-0.1.0.tgz#94085ef63581ecd3daa92444a8fe94e82577751f"
-  dependencies:
-    callsites "^0.2.0"
-
-callsites@^0.2.0:
-  version "0.2.0"
-  resolved "https://registry.yarnpkg.com/callsites/-/callsites-0.2.0.tgz#afab96262910a7f33c19a5775825c69f34e350ca"
-
-chai@^4.0.2:
-  version "4.1.1"
-  resolved "https://registry.yarnpkg.com/chai/-/chai-4.1.1.tgz#66e21279e6f3c6415ff8231878227900e2171b39"
-  dependencies:
-    assertion-error "^1.0.1"
-    check-error "^1.0.1"
-    deep-eql "^2.0.1"
-    get-func-name "^2.0.0"
-    pathval "^1.0.0"
-    type-detect "^4.0.0"
-
-chalk@^1.1.0, chalk@^1.1.1, chalk@^1.1.3:
-  version "1.1.3"
-  resolved "https://registry.yarnpkg.com/chalk/-/chalk-1.1.3.tgz#a8115c55e4a702fe4d150abd3872822a7e09fc98"
-  dependencies:
-    ansi-styles "^2.2.1"
-    escape-string-regexp "^1.0.2"
-    has-ansi "^2.0.0"
-    strip-ansi "^3.0.0"
-    supports-color "^2.0.0"
-
-chalk@^2.0.0:
-  version "2.0.1"
-  resolved "https://registry.yarnpkg.com/chalk/-/chalk-2.0.1.tgz#dbec49436d2ae15f536114e76d14656cdbc0f44d"
-  dependencies:
-    ansi-styles "^3.1.0"
-    escape-string-regexp "^1.0.5"
-    supports-color "^4.0.0"
-
-check-error@^1.0.1:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/check-error/-/check-error-1.0.2.tgz#574d312edd88bb5dd8912e9286dd6c0aed4aac82"
-
-circular-json@^0.3.1:
-  version "0.3.3"
-  resolved "https://registry.yarnpkg.com/circular-json/-/circular-json-0.3.3.tgz#815c99ea84f6809529d2f45791bdf82711352d66"
-
-cli-cursor@^2.1.0:
-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/cli-cursor/-/cli-cursor-2.1.0.tgz#b35dac376479facc3e94747d41d0d0f5238ffcb5"
-  dependencies:
-    restore-cursor "^2.0.0"
-
-cli-width@^2.0.0:
-  version "2.1.0"
-  resolved "https://registry.yarnpkg.com/cli-width/-/cli-width-2.1.0.tgz#b234ca209b29ef66fc518d9b98d5847b00edf00a"
-
-co@^4.6.0:
-  version "4.6.0"
-  resolved "https://registry.yarnpkg.com/co/-/co-4.6.0.tgz#6ea6bdf3d853ae54ccb8e47bfa0bf3f9031fb184"
-
-color-convert@^1.9.0:
-  version "1.9.0"
-  resolved "https://registry.yarnpkg.com/color-convert/-/color-convert-1.9.0.tgz#1accf97dd739b983bf994d56fec8f95853641b7a"
-  dependencies:
-    color-name "^1.1.1"
-
-color-name@^1.1.1:
-  version "1.1.3"
-  resolved "https://registry.yarnpkg.com/color-name/-/color-name-1.1.3.tgz#a7d0558bd89c42f795dd42328f740831ca53bc25"
-
-commander@2.9.0:
-  version "2.9.0"
-  resolved "https://registry.yarnpkg.com/commander/-/commander-2.9.0.tgz#9c99094176e12240cb22d6c5146098400fe0f7d4"
-  dependencies:
-    graceful-readlink ">= 1.0.0"
-
-concat-map@0.0.1:
-  version "0.0.1"
-  resolved "https://registry.yarnpkg.com/concat-map/-/concat-map-0.0.1.tgz#d8a96bd77fd68df7793a73036a3ba0d5405d477b"
-
-concat-stream@^1.6.0:
-  version "1.6.0"
-  resolved "https://registry.yarnpkg.com/concat-stream/-/concat-stream-1.6.0.tgz#0aac662fd52be78964d5532f694784e70110acf7"
-  dependencies:
-    inherits "^2.0.3"
-    readable-stream "^2.2.2"
-    typedarray "^0.0.6"
-
-core-util-is@~1.0.0:
-  version "1.0.2"
-  resolved "https://registry.yarnpkg.com/core-util-is/-/core-util-is-1.0.2.tgz#b5fd54220aa2bc5ab57aab7140c940754503c1a7"
-
-cross-spawn@^5.1.0:
-  version "5.1.0"
-  resolved "https://registry.yarnpkg.com/cross-spawn/-/cross-spawn-5.1.0.tgz#e8bd0efee58fcff6f8f94510a0a554bbfa235449"
-  dependencies:
-    lru-cache "^4.0.1"
-    shebang-command "^1.2.0"
-    which "^1.2.9"
-
-debug@2.6.8, debug@^2.6.8:
-  version "2.6.8"
-  resolved "https://registry.yarnpkg.com/debug/-/debug-2.6.8.tgz#e731531ca2ede27d188222427da17821d68ff4fc"
-  dependencies:
-    ms "2.0.0"
-
-deep-eql@^2.0.1:
-  version "2.0.2"
-  resolved "https://registry.yarnpkg.com/deep-eql/-/deep-eql-2.0.2.tgz#b1bac06e56f0a76777686d50c9feb75c2ed7679a"
-  dependencies:
-    type-detect "^3.0.0"
-
-deep-is@~0.1.3:
-  version "0.1.3"
-  resolved "https://registry.yarnpkg.com/deep-is/-/deep-is-0.1.3.tgz#b369d6fb5dbc13eecf524f91b070feedc357cf34"
-
-del@^2.0.2:
-  version "2.2.2"
-  resolved "https://registry.yarnpkg.com/del/-/del-2.2.2.tgz#c12c981d067846c84bcaf862cff930d907ffd1a8"
-  dependencies:
-    globby "^5.0.0"
-    is-path-cwd "^1.0.0"
-    is-path-in-cwd "^1.0.0"
-    object-assign "^4.0.1"
-    pify "^2.0.0"
-    pinkie-promise "^2.0.0"
-    rimraf "^2.2.8"
-
-diff@3.2.0:
-  version "3.2.0"
-  resolved "https://registry.yarnpkg.com/diff/-/diff-3.2.0.tgz#c9ce393a4b7cbd0b058a725c93df299027868ff9"
-
-doctrine@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/doctrine/-/doctrine-2.0.0.tgz#c73d8d2909d22291e1a007a395804da8b665fe63"
-  dependencies:
-    esutils "^2.0.2"
-    isarray "^1.0.0"
-
-escape-string-regexp@1.0.5, escape-string-regexp@^1.0.2, escape-string-regexp@^1.0.5:
-  version "1.0.5"
-  resolved "https://registry.yarnpkg.com/escape-string-regexp/-/escape-string-regexp-1.0.5.tgz#1b61c0562190a8dff6ae3bb2cf0200ca130b86d4"
-
-eslint-scope@^3.7.1:
-  version "3.7.1"
-  resolved "https://registry.yarnpkg.com/eslint-scope/-/eslint-scope-3.7.1.tgz#3d63c3edfda02e06e01a452ad88caacc7cdcb6e8"
-  dependencies:
-    esrecurse "^4.1.0"
-    estraverse "^4.1.1"
-
-eslint@^4.1.1:
-  version "4.3.0"
-  resolved "https://registry.yarnpkg.com/eslint/-/eslint-4.3.0.tgz#fcd7c96376bbf34c85ee67ed0012a299642b108f"
-  dependencies:
-    ajv "^5.2.0"
-    babel-code-frame "^6.22.0"
-    chalk "^1.1.3"
-    concat-stream "^1.6.0"
-    cross-spawn "^5.1.0"
-    debug "^2.6.8"
-    doctrine "^2.0.0"
-    eslint-scope "^3.7.1"
-    espree "^3.4.3"
-    esquery "^1.0.0"
-    estraverse "^4.2.0"
-    esutils "^2.0.2"
-    file-entry-cache "^2.0.0"
-    functional-red-black-tree "^1.0.1"
-    glob "^7.1.2"
-    globals "^9.17.0"
-    ignore "^3.3.3"
-    imurmurhash "^0.1.4"
-    inquirer "^3.0.6"
-    is-resolvable "^1.0.0"
-    js-yaml "^3.8.4"
-    json-stable-stringify "^1.0.1"
-    levn "^0.3.0"
-    lodash "^4.17.4"
-    minimatch "^3.0.2"
-    mkdirp "^0.5.1"
-    natural-compare "^1.4.0"
-    optionator "^0.8.2"
-    path-is-inside "^1.0.2"
-    pluralize "^4.0.0"
-    progress "^2.0.0"
-    require-uncached "^1.0.3"
-    semver "^5.3.0"
-    strip-json-comments "~2.0.1"
-    table "^4.0.1"
-    text-table "~0.2.0"
-
-espree@^3.4.3:
-  version "3.4.3"
-  resolved "https://registry.yarnpkg.com/espree/-/espree-3.4.3.tgz#2910b5ccd49ce893c2ffffaab4fd8b3a31b82374"
-  dependencies:
-    acorn "^5.0.1"
-    acorn-jsx "^3.0.0"
-
-esprima@^4.0.0:
-  version "4.0.0"
-  resolved "https://registry.yarnpkg.com/esprima/-/esprima-4.0.0.tgz#4499eddcd1110e0b218bacf2fa7f7f59f55ca804"
-
-esquery@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/esquery/-/esquery-1.0.0.tgz#cfba8b57d7fba93f17298a8a006a04cda13d80fa"
-  dependencies:
-    estraverse "^4.0.0"
-
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-  version "4.2.0"
-  resolved "https://registry.yarnpkg.com/esrecurse/-/esrecurse-4.2.0.tgz#fa9568d98d3823f9a41d91e902dcab9ea6e5b163"
-  dependencies:
-    estraverse "^4.1.0"
-    object-assign "^4.0.1"
-
-estraverse@^4.0.0, estraverse@^4.1.0, estraverse@^4.1.1, estraverse@^4.2.0:
-  version "4.2.0"
-  resolved "https://registry.yarnpkg.com/estraverse/-/estraverse-4.2.0.tgz#0dee3fed31fcd469618ce7342099fc1afa0bdb13"
-
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-  version "2.0.2"
-  resolved "https://registry.yarnpkg.com/esutils/-/esutils-2.0.2.tgz#0abf4f1caa5bcb1f7a9d8acc6dea4faaa04bac9b"
-
-external-editor@^2.0.4:
-  version "2.0.4"
-  resolved "https://registry.yarnpkg.com/external-editor/-/external-editor-2.0.4.tgz#1ed9199da9cbfe2ef2f7a31b2fde8b0d12368972"
-  dependencies:
-    iconv-lite "^0.4.17"
-    jschardet "^1.4.2"
-    tmp "^0.0.31"
-
-fast-deep-equal@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/fast-deep-equal/-/fast-deep-equal-1.0.0.tgz#96256a3bc975595eb36d82e9929d060d893439ff"
-
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-  version "2.0.6"
-  resolved "https://registry.yarnpkg.com/fast-levenshtein/-/fast-levenshtein-2.0.6.tgz#3d8a5c66883a16a30ca8643e851f19baa7797917"
-
-figures@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/figures/-/figures-2.0.0.tgz#3ab1a2d2a62c8bfb431a0c94cb797a2fce27c962"
-  dependencies:
-    escape-string-regexp "^1.0.5"
-
-file-entry-cache@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/file-entry-cache/-/file-entry-cache-2.0.0.tgz#c392990c3e684783d838b8c84a45d8a048458361"
-  dependencies:
-    flat-cache "^1.2.1"
-    object-assign "^4.0.1"
-
-flat-cache@^1.2.1:
-  version "1.2.2"
-  resolved "https://registry.yarnpkg.com/flat-cache/-/flat-cache-1.2.2.tgz#fa86714e72c21db88601761ecf2f555d1abc6b96"
-  dependencies:
-    circular-json "^0.3.1"
-    del "^2.0.2"
-    graceful-fs "^4.1.2"
-    write "^0.2.1"
-
-fs.realpath@^1.0.0:
-  version "1.0.0"
-  resolved "https://registry.yarnpkg.com/fs.realpath/-/fs.realpath-1.0.0.tgz#1504ad2523158caa40db4a2787cb01411994ea4f"
-
-functional-red-black-tree@^1.0.1:
-  version "1.0.1"
-  resolved "https://registry.yarnpkg.com/functional-red-black-tree/-/functional-red-black-tree-1.0.1.tgz#1b0ab3bd553b2a0d6399d29c0e3ea0b252078327"
-
-get-func-name@^2.0.0:
-  version "2.0.0"
-  resolved "https://registry.yarnpkg.com/get-func-name/-/get-func-name-2.0.0.tgz#ead774abee72e20409433a066366023dd6887a41"
-
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