feat: add Gatsby plugin

Author: gregberge

packages/gatsby-plugin/README.md

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+# @bundle-analyzer/gatsby-plugin
+
+Official Gatsby plugin for with [Bundle Analyzer service](https://www.bundle-analyzer.com).
+
+## Install
+
+```
+npm install --save-dev @bundle-analyzer/gatsby-plugin
+```
+
+## Usage
+
+**gatsby-config.js**
+
+```js
+plugins: [
+  {
+    resolve: '@bundle-analyzer/gatsby-plugin',
+    options: { token: '<repository-token>' },
+  },
+]
+```
+
+## Options
+
+### token
+
+You can specify the token using options or environment variable `BUNDLE_ANALYZER_TOKEN`.
+
+### configFile
+
+You can specify a custom configuration file.
+
+## Complete documentation
+
+👉 [See full documentation](https://docs.bundle-analyzer.com/)
+
+## License
+
+MIT

packages/gatsby-plugin/gatsby-node.js

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+// eslint-disable-next-line import/no-unresolved
+module.exports = require('./lib/gatsby-node')

packages/gatsby-plugin/index.js

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+// noop

packages/gatsby-plugin/package.json

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+{
+  "name": "@bundle-analyzer/gatsby-plugin",
+  "description": "Bundle Analyzer Gatsby plugin.",
+  "version": "0.3.1",
+  "main": "index.js",
+  "repository": "https://github.com/smooth-code/bundle-analyzer-javascript/tree/master/packages/gatsby-plugin",
+  "author": "Greg Bergé <berge.greg@gmail.com>",
+  "publishConfig": {
+    "access": "public"
+  },
+  "keywords": [
+    "gatsby",
+    "gatsby-plugin",
+    "bundle-analyzer",
+    "bundlesize"
+  ],
+  "engines": {
+    "node": ">=8"
+  },
+  "license": "MIT",
+  "scripts": {
+    "prebuild": "rm -rf lib/",
+    "build": "babel --config-file ../../babel.config.js -d lib --ignore \"**/*.test.js\" src",
+    "prepublishOnly": "yarn run build"
+  },
+  "dependencies": {
+    "@bundle-analyzer/webpack-plugin": "^0.3.1"
+  }
+}

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

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+import BundleAnalyzerPlugin from '@bundle-analyzer/webpack-plugin'
+
+exports.onCreateWebpackConfig = ({ actions }, options) => {
+  actions.setWebpackConfig({
+    plugins: [new BundleAnalyzerPlugin(options)],
+  })
+}