feat(server): get webpack stats using fs

feat(server): get webpack stats using `fs` and `setTimeout` (on first
run)

src/server/ssr/stats.js

@@ -0,0 +1,37 @@
+// @flow
+import fs from 'fs'
+
+let cache = {}
+
+async function getFile (path) {
+	// Cache file forever
+	if (cache[path]) {
+		console.log('from cache')
+		return Promise.resolve(cache[path])
+	}
+
+	return new Promise((resolve, reject) => {
+		// Give Webpack some time on first stats generation
+		setTimeout(() => {
+			fs.readFile(path, 'utf8', (err, data) => {
+				if (err) {
+					throw err
+				}
+				const json = JSON.parse(data)
+				cache[path] = json
+				resolve(json)
+			})
+		}, 4000)
+	})
+}
+
+export default async function () {
+	const basePath = process.env.CLIENT_DIST_PATH
+	const assets = await getFile(`${basePath}/webpack-assets.json`)
+	const faviconsAssets = await getFile(`${basePath}/favicons-stats.json`)
+
+	return {
+		assets,
+		faviconsAssets
+	}
+}