Add purgecss to remove unused css, purgecss config and build config

README.md

@@ -9,10 +9,10 @@ yarn install
 
 Then you can run the development mode with hot reload by:
 ```sh
-gatsby develop
+yarn run develop
 ```
 
 If you want to make a build, do instead:
 ```sh
-gatsby build
-```
+yarn run build
+```

package.json

@@ -8,25 +8,27 @@
     "gatsby-link": "^1.6.40",
     "gatsby-plugin-react-helmet": "^2.0.10",
     "gatsby-source-wordpress": "^2.0.93",
-    "react-helmet": "^5.2.0",
-    "tailwindcss": "^0.6.1"
+    "react-helmet": "^5.2.0"
   },
   "keywords": [
     "gatsby"
   ],
   "license": "MIT",
   "scripts": {
-    "build": "gatsby build",
+    "build": "npm run build:css && purgecss -c ./purgecss.config.js -o ./src/styles && gatsby build",
     "build:css": "tailwind build ./src/styles/index.tailwind.css -c ./tailwind.config.js -o ./src/styles/index.css",
     "develop": "npm run build:css && gatsby develop",
+    "develop:cleanstyles": "npm run build:css && purgecss -c ./purgecss.config.js -o ./src/styles && gatsby develop",
     "format": "prettier --write 'src/**/*.js'",
     "test": "echo \"Error: no test specified\" && exit 1"
   },
   "devDependencies": {
-    "prettier": "^1.12.0"
+    "prettier": "^1.12.0",
+    "purgecss": "^1.0.1",
+    "tailwindcss": "^0.6.1"
   },
   "repository": {
     "type": "git",
     "url": "https://github.com/gatsbyjs/gatsby-starter-default"
   }
-}
+}

purgecss.config.js

@@ -0,0 +1,15 @@
+module.exports = {
+  content: ['./public/**/*.html', './src/**/*.js'],
+  css: ['./src/styles/index.css'],
+  whitelist: ['body', 'html'],
+  extractors: [
+    {
+      extractor: class {
+        static extract(content) {
+          return content.match(/[A-z0-9-:\/]+/g)
+        }
+      },
+      extensions: ['html', 'js'],
+    },
+  ],
+}

yarn.lock

@@ -2,6 +2,82 @@
 # yarn lockfile v1
 
 
+"@babel/code-frame@7.0.0-beta.44":
+  version "7.0.0-beta.44"
+  resolved "https://registry.yarnpkg.com/@babel/code-frame/-/code-frame-7.0.0-beta.44.tgz#2a02643368de80916162be70865c97774f3adbd9"
+  dependencies:
+    "@babel/highlight" "7.0.0-beta.44"
+
+"@babel/generator@7.0.0-beta.44":
+  version "7.0.0-beta.44"
+  resolved "https://registry.yarnpkg.com/@babel/generator/-/generator-7.0.0-beta.44.tgz#c7e67b9b5284afcf69b309b50d7d37f3e5033d42"
+  dependencies:
+    "@babel/types" "7.0.0-beta.44"
+    jsesc "^2.5.1"
+    lodash "^4.2.0"
+    source-map "^0.5.0"
+    trim-right "^1.0.1"
+
+"@babel/helper-function-name@7.0.0-beta.44":
+  version "7.0.0-beta.44"
+  resolved "https://registry.yarnpkg.com/@babel/helper-function-name/-/helper-function-name-7.0.0-beta.44.tgz#e18552aaae2231100a6e485e03854bc3532d44dd"
+  dependencies:
+    "@babel/helper-get-function-arity" "7.0.0-beta.44"
+    "@babel/template" "7.0.0-beta.44"
+    "@babel/types" "7.0.0-beta.44"
+
+"@babel/helper-get-function-arity@7.0.0-beta.44":
+  version "7.0.0-beta.44"
+  resolved "https://registry.yarnpkg.com/@babel/helper-get-function-arity/-/helper-get-function-arity-7.0.0-beta.44.tgz#d03ca6dd2b9f7b0b1e6b32c56c72836140db3a15"
+  dependencies:
+    "@babel/types" "7.0.0-beta.44"
+
+"@babel/helper-split-export-declaration@7.0.0-beta.44":
+  version "7.0.0-beta.44"
+  resolved "https://registry.yarnpkg.com/@babel/helper-split-export-declaration/-/helper-split-export-declaration-7.0.0-beta.44.tgz#c0b351735e0fbcb3822c8ad8db4e583b05ebd9dc"
+  dependencies:
+    "@babel/types" "7.0.0-beta.44"
+
+"@babel/highlight@7.0.0-beta.44":
+  version "7.0.0-beta.44"
+  resolved "https://registry.yarnpkg.com/@babel/highlight/-/highlight-7.0.0-beta.44.tgz#18c94ce543916a80553edcdcf681890b200747d5"
+  dependencies:
+    chalk "^2.0.0"
+    esutils "^2.0.2"
+    js-tokens "^3.0.0"
+
+"@babel/template@7.0.0-beta.44":
+  version "7.0.0-beta.44"
+  resolved "https://registry.yarnpkg.com/@babel/template/-/template-7.0.0-beta.44.tgz#f8832f4fdcee5d59bf515e595fc5106c529b394f"
+  dependencies:
+    "@babel/code-frame" "7.0.0-beta.44"
+    "@babel/types" "7.0.0-beta.44"
+    babylon "7.0.0-beta.44"
+    lodash "^4.2.0"
+
+"@babel/traverse@7.0.0-beta.44":
+  version "7.0.0-beta.44"
+  resolved "https://registry.yarnpkg.com/@babel/traverse/-/traverse-7.0.0-beta.44.tgz#a970a2c45477ad18017e2e465a0606feee0d2966"
+  dependencies:
+    "@babel/code-frame" "7.0.0-beta.44"
+    "@babel/generator" "7.0.0-beta.44"
+    "@babel/helper-function-name" "7.0.0-beta.44"
+    "@babel/helper-split-export-declaration" "7.0.0-beta.44"
+    "@babel/types" "7.0.0-beta.44"
+    babylon "7.0.0-beta.44"
+    debug "^3.1.0"
+    globals "^11.1.0"
+    invariant "^2.2.0"
+    lodash "^4.2.0"
+
+"@babel/types@7.0.0-beta.44":
+  version "7.0.0-beta.44"
+  resolved "https://registry.yarnpkg.com/@babel/types/-/types-7.0.0-beta.44.tgz#6b1b164591f77dec0a0342aca995f2d046b3a757"
+  dependencies:
+    esutils "^2.0.2"
+    lodash "^4.2.0"
+    to-fast-properties "^2.0.0"
+
 "@types/configstore@^2.1.1":
   version "2.1.1"
   resolved "https://registry.yarnpkg.com/@types/configstore/-/configstore-2.1.1.tgz#cd1e8553633ad3185c3f2f239ecff5d2643e92b6"
@@ -415,6 +491,17 @@ babel-core@^6.24.1, babel-core@^6.26.0:
     slash "^1.0.0"
     source-map "^0.5.7"
 
+babel-eslint@^8.2.3:
+  version "8.2.5"
+  resolved "https://registry.yarnpkg.com/babel-eslint/-/babel-eslint-8.2.5.tgz#dc2331c259d36782aa189da510c43dedd5adc7a3"
+  dependencies:
+    "@babel/code-frame" "7.0.0-beta.44"
+    "@babel/traverse" "7.0.0-beta.44"
+    "@babel/types" "7.0.0-beta.44"
+    babylon "7.0.0-beta.44"
+    eslint-scope "~3.7.1"
+    eslint-visitor-keys "^1.0.0"
+
 babel-generator@^6.24.1, babel-generator@^6.26.0:
   version "6.26.1"
   resolved "https://registry.yarnpkg.com/babel-generator/-/babel-generator-6.26.1.tgz#1844408d3b8f0d35a404ea7ac180f087a601bd90"
@@ -1179,6 +1266,10 @@ babel-types@^6.19.0, babel-types@^6.24.1, babel-types@^6.26.0:
     lodash "^4.17.4"
     to-fast-properties "^1.0.3"
 
+babylon@7.0.0-beta.44:
+  version "7.0.0-beta.44"
+  resolved "https://registry.yarnpkg.com/babylon/-/babylon-7.0.0-beta.44.tgz#89159e15e6e30c5096e22d738d8c0af8a0e8ca1d"
+
 babylon@^6.17.3, babylon@^6.18.0:
   version "6.18.0"
   resolved "https://registry.yarnpkg.com/babylon/-/babylon-6.18.0.tgz#af2f3b88fa6f5c1e4c634d1a0f8eac4f55b395e3"
@@ -2125,6 +2216,10 @@ cssesc@^0.1.0:
   version "0.1.0"
   resolved "https://registry.yarnpkg.com/cssesc/-/cssesc-0.1.0.tgz#c814903e45623371a0477b40109aaafbeeaddbb4"
 
+cssesc@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/cssesc/-/cssesc-1.0.1.tgz#ef7bd8d0229ed6a3a7051ff7771265fe7330e0a8"
+
 "cssnano@>=2.6.1 <4":
   version "3.10.0"
   resolved "https://registry.yarnpkg.com/cssnano/-/cssnano-3.10.0.tgz#4f38f6cea2b9b17fa01490f23f1dc68ea65c1c38"
@@ -2653,6 +2748,17 @@ escape-string-regexp@1.0.5, escape-string-regexp@^1.0.2, escape-string-regexp@^1
   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-visitor-keys@^1.0.0:
+  version "1.0.0"
+  resolved "https://registry.yarnpkg.com/eslint-visitor-keys/-/eslint-visitor-keys-1.0.0.tgz#3f3180fb2e291017716acb4c9d6d5b5c34a6a81d"
+
 esniff@^1.1:
   version "1.1.0"
   resolved "https://registry.yarnpkg.com/esniff/-/esniff-1.1.0.tgz#c66849229f91464dede2e0d40201ed6abf65f2ac"
@@ -2668,6 +2774,16 @@ esprima@^4.0.0:
   version "4.0.0"
   resolved "https://registry.yarnpkg.com/esprima/-/esprima-4.0.0.tgz#4499eddcd1110e0b218bacf2fa7f7f59f55ca804"
 
+esrecurse@^4.1.0:
+  version "4.2.1"
+  resolved "https://registry.yarnpkg.com/esrecurse/-/esrecurse-4.2.1.tgz#007a3b9fdbc2b3bb87e4879ea19c92fdbd3942cf"
+  dependencies:
+    estraverse "^4.1.0"
+
+estraverse@^4.1.0, estraverse@^4.1.1:
+  version "4.2.0"
+  resolved "https://registry.yarnpkg.com/estraverse/-/estraverse-4.2.0.tgz#0dee3fed31fcd469618ce7342099fc1afa0bdb13"
+
 esutils@^2.0.2:
   version "2.0.2"
   resolved "https://registry.yarnpkg.com/esutils/-/esutils-2.0.2.tgz#0abf4f1caa5bcb1f7a9d8acc6dea4faaa04bac9b"
@@ -3550,6 +3666,10 @@ global@^4.3.0:
     min-document "^2.19.0"
     process "~0.5.1"
 
+globals@^11.1.0:
+  version "11.7.0"
+  resolved "https://registry.yarnpkg.com/globals/-/globals-11.7.0.tgz#a583faa43055b1aca771914bf68258e2fc125673"
+
 globals@^9.18.0:
   version "9.18.0"
   resolved "https://registry.yarnpkg.com/globals/-/globals-9.18.0.tgz#aa3896b3e69b487f17e31ed2143d69a8e30c2d8a"
@@ -4378,6 +4498,10 @@ jsesc@^1.3.0:
   version "1.3.0"
   resolved "https://registry.yarnpkg.com/jsesc/-/jsesc-1.3.0.tgz#46c3fec8c1892b12b0833db9bc7622176dbab34b"
 
+jsesc@^2.5.1:
+  version "2.5.1"
+  resolved "https://registry.yarnpkg.com/jsesc/-/jsesc-2.5.1.tgz#e421a2a8e20d6b0819df28908f782526b96dd1fe"
+
 jsesc@~0.5.0:
   version "0.5.0"
   resolved "https://registry.yarnpkg.com/jsesc/-/jsesc-0.5.0.tgz#e7dee66e35d6fc16f710fe91d5cf69f70f08911d"
@@ -6188,6 +6312,15 @@ postcss-selector-parser@^3.1.1:
     indexes-of "^1.0.1"
     uniq "^1.0.1"
 
+postcss-selector-parser@^5.0.0-rc.3:
+  version "5.0.0-rc.3"
+  resolved "https://registry.yarnpkg.com/postcss-selector-parser/-/postcss-selector-parser-5.0.0-rc.3.tgz#c4525dcc8eb90166c53dcbf0cb9317ceff5a15b5"
+  dependencies:
+    babel-eslint "^8.2.3"
+    cssesc "^1.0.1"
+    indexes-of "^1.0.1"
+    uniq "^1.0.1"
+
 postcss-svgo@^2.1.1:
   version "2.1.6"
   resolved "https://registry.yarnpkg.com/postcss-svgo/-/postcss-svgo-2.1.6.tgz#b6df18aa613b666e133f08adb5219c2684ac108d"
@@ -6226,7 +6359,7 @@ postcss@^5.0.0, postcss@^5.0.10, postcss@^5.0.11, postcss@^5.0.12, postcss@^5.0.
     source-map "^0.5.6"
     supports-color "^3.2.3"
 
-postcss@^6.0.1, postcss@^6.0.11, postcss@^6.0.14, postcss@^6.0.9:
+postcss@^6.0.1, postcss@^6.0.11, postcss@^6.0.14, postcss@^6.0.22, postcss@^6.0.9:
   version "6.0.23"
   resolved "https://registry.yarnpkg.com/postcss/-/postcss-6.0.23.tgz#61c82cc328ac60e677645f979054eb98bc0e3324"
   dependencies:
@@ -6345,6 +6478,15 @@ punycode@^1.2.4, punycode@^1.4.1:
   version "1.4.1"
   resolved "https://registry.yarnpkg.com/punycode/-/punycode-1.4.1.tgz#c0d5a63b2718800ad8e1eb0fa5269c84dd41845e"
 
+purgecss@^1.0.1:
+  version "1.0.1"
+  resolved "https://registry.yarnpkg.com/purgecss/-/purgecss-1.0.1.tgz#652e6b0958b6fd362591f401c406ed33d0cdb958"
+  dependencies:
+    glob "^7.1.2"
+    postcss "^6.0.22"
+    postcss-selector-parser "^5.0.0-rc.3"
+    yargs "^11.0.0"
+
 q@^1.1.2:
   version "1.5.1"
   resolved "https://registry.yarnpkg.com/q/-/q-1.5.1.tgz#7e32f75b41381291d04611f1bf14109ac00651d7"
@@ -7421,7 +7563,7 @@ source-map@^0.4.4, source-map@~0.4.1:
   dependencies:
     amdefine ">=0.0.4"
 
-source-map@^0.5.3, source-map@^0.5.6, source-map@^0.5.7, source-map@~0.5.1, source-map@~0.5.3:
+source-map@^0.5.0, source-map@^0.5.3, source-map@^0.5.6, source-map@^0.5.7, source-map@~0.5.1, source-map@~0.5.3:
   version "0.5.7"
   resolved "https://registry.yarnpkg.com/source-map/-/source-map-0.5.7.tgz#8a039d2d1021d22d1ea14c80d8ea468ba2ef3fcc"
 
@@ -7814,6 +7956,10 @@ to-fast-properties@^1.0.3:
   version "1.0.3"
   resolved "https://registry.yarnpkg.com/to-fast-properties/-/to-fast-properties-1.0.3.tgz#b83571fa4d8c25b82e231b06e3a3055de4ca1a47"
 
+to-fast-properties@^2.0.0:
+  version "2.0.0"
+  resolved "https://registry.yarnpkg.com/to-fast-properties/-/to-fast-properties-2.0.0.tgz#dc5e698cbd079265bc73e0377681a4e4e83f616e"
+
 to-object-path@^0.3.0:
   version "0.3.0"
   resolved "https://registry.yarnpkg.com/to-object-path/-/to-object-path-0.3.0.tgz#297588b7b0e7e0ac08e04e672f85c1f4999e17af"
@@ -8437,7 +8583,7 @@ yargs@4.7.1:
     y18n "^3.2.1"
     yargs-parser "^2.4.0"
 
-yargs@^11.1.0:
+yargs@^11.0.0, yargs@^11.1.0:
   version "11.1.0"
   resolved "https://registry.yarnpkg.com/yargs/-/yargs-11.1.0.tgz#90b869934ed6e871115ea2ff58b03f4724ed2d77"
   dependencies: