Add gatsby-compression-plugin.

packages/gatsby-compression-plugin/.gitignore

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+*.DS_Store
+node_modules/

packages/gatsby-compression-plugin/.npmignore

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+src
+.gitignore

packages/gatsby-compression-plugin/LICENSE

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+Copyright 2017 Harrison C Bowden, Minneapolis, Minnesota
+
+Permission to use, copy, modify, and/or distribute this software for any purpose with or without fee is hereby granted, provided that the above copyright notice and this permission notice appear in all copies.
+
+THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.

packages/gatsby-compression-plugin/README.md

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+# Gatsby plugin compression
+
+First install `gatsby-plugin-compression`.
+
+```bash
+
+npm install gatsby-plugin-compression --save
+
+```
+
+Then add `gatsby-plugin-compression` to your app's `gatsby-config.js`.
+
+```javascript
+
+module.exports = {
+  plugins: [
+    `gatsby-plugin-compression`,
+  ],
+}
+
+```
+
+That's it, when you build your app you will have gzipped versions of your files.
+
+# Nginx
+
+If your using nginx you can use `gzip_static on;` to serve your gzipped assets, here's a full example.
+
+```bash
+
+#user  nobody;
+worker_processes  1;
+
+events {
+    worker_connections  1024;
+}
+
+pid /usr/local/nginx/logs/nginx.pid;
+
+server {
+    listen       80;
+    server_name  localhost;
+
+    #access_log  logs/host.access.log  main;
+
+    location / {
+        gzip_static on;
+        root   Users/nah/Desktop/web;
+        index  index.html index.htm;
+    }
+}
+
+```

packages/gatsby-compression-plugin/package.json

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+{
+  "name": "gatsby-plugin-compression",
+  "version": "0.0.1",
+  "description": "Gatsby plugin for compressing assets.",
+  "main": "gatsby-node.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "keywords": [
+    "gatsby",
+    "plugin",
+    "compression"
+  ],
+  "author": "Harrison Bowden",
+  "license": "ISC",
+  "dependencies": {
+    "compression-webpack-plugin": "^1.0.1"
+  }
+}

packages/gatsby-compression-plugin/src/gatsby-node.js

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+const CompressionPlugin = require(`compression-webpack-plugin`)
+
+exports.modifyWebpackConfig = ({ config, stage }, options) => {
+  switch (stage) {
+    case `build-html`:
+    case `build-javascript`:
+    case `build-css`: {
+      config.plugin(`compression`,
+        CompressionPlugin,
+        [{ asset: `[path].gz[query]`, algorithm: `gzip` }]
+      )
+      return config
+    }
+    default: {
+      return config
+    }
+  }
+}