STCLI-224 Add transpile command (#295)

* Add transpile command

* Cleanup

* Add ability to analyze output

* Cleanup

lib/commands/transpile.js

@@ -0,0 +1,60 @@
+const importLazy = require('import-lazy')(require);
+
+const { contextMiddleware } = importLazy('../cli/context-middleware');
+const StripesCore = importLazy('../cli/stripes-core');
+const StripesPlatform = importLazy('../platform/stripes-platform');
+const { stripesConfigFile } = importLazy('./common-options');
+const { processError, processStats } = importLazy('../webpack-common');
+
+let _stripesPlatform;
+let _stripesCore;
+
+// stripesPlatform and stripesCore overrides primarily used as injection for unit tests
+function stripesOverrides(stripesPlatform, stripesCore) {
+  _stripesPlatform = stripesPlatform;
+  _stripesCore = stripesCore;
+}
+
+function transpileCommand(argv) {
+  const context = argv.context;
+  // Default transpile command to production env
+  if (!process.env.NODE_ENV) {
+    process.env.NODE_ENV = 'production';
+  }
+
+  const platform = _stripesPlatform || new StripesPlatform(argv.stripesConfig, context, argv);
+  const webpackOverrides = [];
+
+  if (argv.analyze) {
+    const BundleAnalyzerPlugin = require('webpack-bundle-analyzer').BundleAnalyzerPlugin; // eslint-disable-line
+    webpackOverrides.push((config) => {
+      config.plugins.push(new BundleAnalyzerPlugin());
+      return config;
+    });
+  }
+
+  console.info('Transpiling...');
+  const stripes = _stripesCore || new StripesCore(context, platform.aliases);
+  stripes.api.transpile(Object.assign({}, argv, { webpackOverrides }))
+    .then(processStats)
+    .catch(processError);
+}
+
+module.exports = {
+  command: 'transpile',
+  describe: 'Transpile single module',
+  builder: (yargs) => {
+    yargs
+      .middleware([
+        contextMiddleware(),
+      ])
+      .positional('configFile', stripesConfigFile.configFile)
+      .option('analyze', {
+        describe: 'Run the Webpack Bundle Analyzer after build (launches in browser)',
+        type: 'boolean',
+      })
+      .example('$0 transpile', 'Transpile a module');
+  },
+  handler: transpileCommand,
+  stripesOverrides,
+};