fix: platform agnostic react-renderer build process

src/main/js/react-renderer/build.js

@@ -0,0 +1,46 @@
+const fs = require('fs');
+const babel = require('babel-core');
+
+if (!fs.existsSync('./build')) {
+  fs.mkdirSync('./build');
+}
+
+if (!fs.existsSync('../../app/build/asset-manifest.json')) {
+  return console.log('../../app/build/asset-manifest.json does not exist - has the build run?')
+}
+
+fs.writeFile('./build/renderer.js','// polyfill.js\n\n', function(err) {
+  if (err) { return console.log(err); }
+  fs.readFile('./polyfill.js', 'utf-8', function(err, data) {
+    if (err) { return console.log(err); }
+    // Running this through Babel breaks one of the polyfills. Until I work
+    // that out, merge it in manually.
+    fs.appendFile('./build/renderer.js', data, function (err) {
+      if (err) { return console.log(err); }
+      fs.appendFile('./build/renderer.js', '\n// asset-manifest.json\nvar assetManifest = \n', function (err) {
+        if (err) { return console.log(err); }
+        fs.readFile('../../app/build/asset-manifest.json', 'utf-8', function(err, data) {
+          if (err) { return console.log(err); }
+          // It's unreasonably difficult to load this file from the classpath at
+          // runtime, so I'm just adding it in at build time.
+          fs.appendFile('./build/renderer.js', data, function (err) {
+            if (err) { return console.log(err); }
+            fs.appendFile('./build/renderer.js', ';\n\n\n// renderer.js\n\n', function (err) {
+              if (err) { return console.log(err); }
+              fs.readFile('./renderer.js', 'utf-8', function(err, data) {
+                if (err) { return console.log(err); }
+                const transformedRendererJs = babel.transform(data, {
+                  "presets": ["es2015"],
+                  "plugins": ["transform-object-rest-spread"]
+                });
+                fs.appendFile('./build/renderer.js',transformedRendererJs.code, function (err) {
+                  if (err) { return console.log(err); }
+                });
+              });
+            });
+          });
+        });
+      });
+    });
+  });
+});

src/main/js/react-renderer/build.sh

@@ -1,4 +1,5 @@
 #!/bin/bash
+# !!!! Converted to build.js in the spirit of being platform agnostic !!!!
 
 set -eo pipefail
 

src/main/js/react-renderer/package.json

@@ -10,7 +10,7 @@
     "eslint": "^4.6.1"
   },
   "scripts": {
-    "build": "./build.sh",
+    "build": "node build.js",
     "lint": "eslint --ext .js ."
   }
 }