update: use PostCSS 8 API. (#125)

* BREAKING CHANGE: require PostCSS 8 and Node >= 10..
* Move postcss to peer dependencies.

Author: ludofischer

.travis.yml

@@ -2,6 +2,5 @@ language: node_js
 cache: yarn
 node_js:
   - node
+  - "12"
   - "10"
-  - "8"
-  - "6"

package.json

@@ -45,13 +45,16 @@
     "eslint-config-i-am-meticulous": "^11.0.0",
     "eslint-plugin-babel": "^5.2.1",
     "eslint-plugin-import": "^2.14.0",
-    "jison-gho": "^0.6.1-215"
+    "jison-gho": "^0.6.1-215",
+    "postcss": "^8.2.2"
   },
   "dependencies": {
-    "postcss": "^7.0.27",
     "postcss-selector-parser": "^6.0.2",
     "postcss-value-parser": "^4.0.2"
   },
+  "peerDependencies": {
+    "postcss": "^8.2.2"
+  },
   "ava": {
     "require": [
       "@babel/register",

src/index.js

@@ -1,8 +1,6 @@
-import {plugin} from 'postcss';
-
 import transform from './lib/transform';
 
-export default plugin('postcss-calc', (opts) => {
+function pluginCreator(opts) {
   const options = Object.assign({
     precision: 5,
     preserve: false,
@@ -11,21 +9,28 @@ export default plugin('postcss-calc', (opts) => {
     selectors: false
   }, opts);
 
-  return (css, result) => {
-    css.walk(node => {
-      const { type } = node;
+  return {
+    postcssPlugin: 'postcss-calc',
+    OnceExit(css, { result }) {
+      css.walk(node => {
+        const { type } = node;
+
+        if (type === 'decl') {
+          transform(node, "value", options, result);
+        }
+        
+        if (type === 'atrule' && options.mediaQueries) {
+          transform(node, "params", options, result);
+        }
 
-      if (type === 'decl') {
-        transform(node, "value", options, result);
-      }
+        if (type === 'rule' && options.selectors) {
+          transform(node, "selector", options, result);
+        }
+      });
+    }
+  }
+}
 
-      if (type === 'atrule' && options.mediaQueries) {
-        transform(node, "params", options, result);
-      }
+pluginCreator.postcss = true;
 
-      if (type === 'rule' && options.selectors) {
-        transform(node, "selector", options, result);
-      }
-    });
-  };
-});
+export default pluginCreator;

yarn.lock

@@ -1349,6 +1349,11 @@ [email protected]:
   resolved "https://registry.yarnpkg.com/color-name/-/color-name-1.1.3.tgz#a7d0558bd89c42f795dd42328f740831ca53bc25"
   integrity sha1-p9BVi9icQveV3UIyj3QIMcpTvCU=
 
+colorette@^1.2.1:
+  version "1.2.1"
+  resolved "https://registry.yarnpkg.com/colorette/-/colorette-1.2.1.tgz#4d0b921325c14faf92633086a536db6e89564b1b"
+  integrity sha512-puCDz0CzydiSYOrnXpz/PKd69zRrribezjtE9yd4zvytoRc8+RY/KJPvtPFKZS3E3wP6neGyMe0vOTlHO5L3Pw==
+
 commander@^2.8.1:
   version "2.20.0"
   resolved "https://registry.yarnpkg.com/commander/-/commander-2.20.0.tgz#d58bb2b5c1ee8f87b0d340027e9e94e222c5a422"
@@ -3141,6 +3146,11 @@ nan@^2.9.2:
   resolved "https://registry.yarnpkg.com/nan/-/nan-2.13.2.tgz#f51dc7ae66ba7d5d55e1e6d4d8092e802c9aefe7"
   integrity sha512-TghvYc72wlMGMVMluVo9WRJc0mB8KxxF/gZ4YYFy7V2ZQX9l7rgbPg7vjS9mt6U5HXODVFVI2bOduCzwOMv/lw==
 
+nanoid@^3.1.20:
+  version "3.1.20"
+  resolved "https://registry.yarnpkg.com/nanoid/-/nanoid-3.1.20.tgz#badc263c6b1dcf14b71efaa85f6ab4c1d6cfc788"
+  integrity sha512-a1cQNyczgKbLX9jwbS/+d7W8fX/RfgYR7lVWwWOGIPNgK2m0MWvrGF6/m4kk6U3QcFMnZf3RIhL0v2Jgh/0Uxw==
+
 nanomatch@^1.2.9:
   version "1.2.13"
   resolved "https://registry.yarnpkg.com/nanomatch/-/nanomatch-1.2.13.tgz#b87a8aa4fc0de8fe6be88895b38983ff265bd119"
@@ -3627,14 +3637,14 @@ postcss-value-parser@^4.0.2:
   resolved "https://registry.yarnpkg.com/postcss-value-parser/-/postcss-value-parser-4.0.3.tgz#651ff4593aa9eda8d5d0d66593a2417aeaeb325d"
   integrity sha512-N7h4pG+Nnu5BEIzyeaaIYWs0LI5XC40OrRh5L60z0QjFsqGWcHcbkBvpe1WYpcIS9yQ8sOi/vIPt1ejQCrMVrg==
 
-postcss@^7.0.27:
-  version "7.0.27"
-  resolved "https://registry.yarnpkg.com/postcss/-/postcss-7.0.27.tgz#cc67cdc6b0daa375105b7c424a85567345fc54d9"
-  integrity sha512-WuQETPMcW9Uf1/22HWUWP9lgsIC+KEHg2kozMflKjbeUtw9ujvFX6QmIfozaErDkmLWS9WEnEdEe6Uo9/BNTdQ==
+postcss@^8.2.2:
+  version "8.2.2"
+  resolved "https://registry.yarnpkg.com/postcss/-/postcss-8.2.2.tgz#60613b62297005084fd21024a68637798864fe26"
+  integrity sha512-HM1NDNWLgglJPQQMNwvLxgH2KcrKZklKLi/xXYIOaqQB57p/pDWEJNS83PVICYsn1Dg/9C26TiejNr422/ePaQ==
   dependencies:
-    chalk "^2.4.2"
+    colorette "^1.2.1"
+    nanoid "^3.1.20"
     source-map "^0.6.1"
-    supports-color "^6.1.0"
 
 prelude-ls@~1.1.2:
   version "1.1.2"