Install scripts, build app with rollup & configurable mirror app id

app/rollup/no-memcpy-plugin.js

@@ -0,0 +1,34 @@
+import MagicString from 'magic-string';
+
+const MEMCPY_REQUIRE_STRING = 'require("memcpy")';
+const REPLACEMENT_STRING = 'null';
+
+// We're doing this because memcpy is an optional dependency of ByteBufferNB,
+// but Rollup doesn't understand optional dependencies and tries to use it.
+// We can't simply use memcpy, because it has native code for older versions of
+// Node and no longer builds!
+export default (variant) => {
+    let mainId = null;
+
+    return {
+        name: 'no-memcpy-plugin'
+      , transform: (code, id) => {
+            if (id.endsWith('ByteBufferNB.js')) {
+                const start = code.indexOf(MEMCPY_REQUIRE_STRING);
+
+                if (start >= 0) {
+                    const magicString = new MagicString(code);
+                    const end = start + MEMCPY_REQUIRE_STRING.length;
+                    magicString.overwrite(start, end, REPLACEMENT_STRING);
+
+                    return {
+                        code: magicString.toString()
+                      , map: magicString.generateMap()
+                    };
+                }
+            }
+
+            return null;
+        }
+    }
+}

app/rollup/rollup.config.js

@@ -0,0 +1,56 @@
+import { resolve } from 'path'
+
+import babel from 'rollup-plugin-babel'
+import builtins from 'rollup-plugin-node-builtins'
+import commonjs from 'rollup-plugin-commonjs'
+import json from 'rollup-plugin-json'
+import nodeResolve from 'rollup-plugin-node-resolve'
+
+import noMemcpy from './no-memcpy-plugin'
+
+export default options => {
+    // TODO: Enabling this option presently doesn't work because castv2 proto
+    // files aren't bundled, can be fixed with a couple of plugins
+    const external = options.dependencies ? () => false : (id, parentId) => {
+        if (!parentId) {
+            return true;
+        }
+
+        return !!id.match(/^[^./].+$/)
+            || resolve(parentId, '..', id).includes('/node_modules/');
+    };
+
+    return {
+        external
+      , input: './src/js/main.js'
+      , plugins: [
+            noMemcpy()
+          , babel({
+                exclude: [
+                    'node_modules/**'
+                ]
+              , runtimeHelpers: true
+            })
+          , json()
+          , builtins()
+          , nodeResolve({
+                module: true
+              , jsnext: true
+              , main: true
+              , browser: false
+            })
+          , commonjs({
+                // Protobuf detects itself running in Node by attempting to
+				// require fs, so we better allow it...
+                ignore: ['fs']
+            })
+        ]
+      , output: [
+            {
+                file: resolve(__dirname, '../../dist/app/app.js')
+              , format: 'cjs'
+              , sourcemap: options.sourcemap || false
+            }
+        ]
+    };
+}