Allow saving source maps during build

Summary: This makes it possible to save source maps to a separate folder so we can upload them from CI.

Reviewed By: nikoant

Differential Revision: D29521599

fbshipit-source-id: a137659092b7648858b97ecf5b5c60c88889517a

desktop/scripts/build-release.ts

@@ -26,6 +26,7 @@ import {
   getVersionNumber,
   genMercurialRevision,
   prepareDefaultPlugins,
+  moveSourceMaps,
 } from './build-utils';
 import fetch from '@adobe/node-fetch-retry';
 import {getIcons, buildLocalIconPath, getIconURL} from '../app/src/utils/icons';
@@ -93,6 +94,11 @@ const argv = yargs
         'Directory with prepared list of default plugins which will be included into the Flipper distribution as "defaultPlugins" dir',
       type: 'string',
     },
+    'source-map-dir': {
+      describe:
+        'Directory to write the main.bundle.map and bundle.map files for the main and render bundle sourcemaps, respectively',
+      type: 'string',
+    },
   })
   .help()
   .strict()
@@ -360,6 +366,7 @@ function downloadIcons(buildFolder: string) {
   await copyStaticFolder(dir);
   await downloadIcons(dir);
   await compileRenderer(dir);
+  await moveSourceMaps(dir, argv['source-map-dir']);
   const versionNumber = getVersionNumber(argv.version);
   const hgRevision = await genMercurialRevision();
   await modifyPackageManifest(dir, versionNumber, hgRevision, argv.channel);