apply config/fastboot.js the same way that ember-cli-fastboot does

index.js

@@ -1,11 +1,17 @@
 'use strict';
 
 const premberConfig = require('./lib/config');
+const path = require('path');
+const fs = require('fs');
 
 module.exports = {
   name: require('./package').name,
   premberConfig,
 
+  included(app) {
+    this.fastbootOptions = fastbootOptionsFor(app.env, app.project);
+  },
+
   postprocessTree(type, tree) {
     if (type !== 'all') {
       return tree;
@@ -39,6 +45,8 @@ module.exports = {
       return tree;
     }
 
+    config.fastbootOptions = this.fastbootOptions;
+
     let Prerender = require('./lib/prerender');
     let BroccoliDebug = require('broccoli-debug');
     let Merge = require('broccoli-merge-trees');
@@ -96,3 +104,15 @@ function loadPremberPlugins(context) {
       return premberPlugin;
     });
 }
+
+function fastbootOptionsFor(environment, project) {
+  const configPath = path.join(
+    path.dirname(project.configPath()),
+    'fastboot.js'
+  );
+
+  if (fs.existsSync(configPath)) {
+    return require(configPath)(environment);
+  }
+  return {};
+}

lib/prerender.js

@@ -15,7 +15,7 @@ const port = 7784;
 class Prerender extends Plugin {
   constructor(
     builtAppTree,
-    { urls, indexFile, emptyFile },
+    { urls, indexFile, emptyFile, fastbootOptions },
     ui,
     plugins,
     rootURL
@@ -30,6 +30,7 @@ class Prerender extends Plugin {
     this.protocol = protocol;
     this.port = port;
     this.host = `localhost:${port}`;
+    this.fastbootOptions = fastbootOptions || {};
   }
 
   async listUrls(app, protocol, host) {
@@ -108,9 +109,11 @@ class Prerender extends Plugin {
       JSON.stringify(pkg)
     );
 
-    let app = new FastBoot({
-      distPath: this.inputPaths[0],
-    });
+    let app = new FastBoot(
+      Object.assign({}, this.fastbootOptions, {
+        distPath: this.inputPaths[0],
+      })
+    );
 
     let expressServer = express()
       .use(this.rootURL, express.static(this.inputPaths[0]))