split build process

Summary: Moving a couple of build function from `build-release` to `build-utils` so they can be shared between the desktop build process and the headless build process.

Reviewed By: passy

Differential Revision: D13786575

fbshipit-source-id: df0a0da6d9a643e3e1c65470e1e96254e8966dd9

scripts/build-utils.js

@@ -0,0 +1,96 @@
+/**
+ * Copyright 2018-present Facebook.
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ * @format
+ */
+
+const Metro = require('../static/node_modules/metro');
+const compilePlugins = require('../static/compilePlugins');
+const tmp = require('tmp');
+const path = require('path');
+const fs = require('fs-extra');
+
+function die(err) {
+  console.error(err.stack);
+  process.exit(1);
+}
+
+function compileDefaultPlugins(buildFolder) {
+  const defaultPluginFolder = 'defaultPlugins';
+  const defaultPluginDir = path.join(buildFolder, defaultPluginFolder);
+  return compilePlugins(
+    null,
+    [
+      path.join(__dirname, '..', 'src', 'plugins'),
+      path.join(__dirname, '..', 'src', 'fb', 'plugins'),
+    ],
+    defaultPluginDir,
+    {force: true, failSilently: false},
+  )
+    .then(defaultPlugins =>
+      fs.writeFileSync(
+        path.join(defaultPluginDir, 'index.json'),
+        JSON.stringify(
+          defaultPlugins.map(plugin => ({
+            ...plugin,
+            out: path.join(defaultPluginFolder, path.parse(plugin.out).base),
+          })),
+        ),
+      ),
+    )
+    .catch(die);
+}
+
+function compile(buildFolder, entry) {
+  // eslint-disable-next-line no-console
+  console.log('Building main bundle', entry);
+
+  const projectRoots = path.join(__dirname, '..');
+  return Metro.runBuild(
+    {
+      reporter: {update: () => {}},
+      projectRoot: projectRoots,
+      watchFolders: [projectRoots],
+      serializer: {},
+      transformer: {
+        babelTransformerPath: path.join(
+          __dirname,
+          '..',
+          'static',
+          'transforms',
+          'index.js',
+        ),
+      },
+    },
+    {
+      dev: false,
+      minify: false,
+      resetCache: true,
+      sourceMap: true,
+      entry,
+      out: path.join(buildFolder, 'bundle.js'),
+    },
+  ).catch(die);
+}
+
+function buildFolder() {
+  // eslint-disable-next-line no-console
+  console.log('Creating build directory');
+  return new Promise((resolve, reject) => {
+    tmp.dir((err, buildFolder) => {
+      if (err) {
+        reject(err);
+      } else {
+        resolve(buildFolder);
+      }
+    });
+  }).catch(die);
+}
+
+module.exports = {
+  buildFolder,
+  compile,
+  die,
+  compileDefaultPlugins,
+};