add fastlane commands to generate source maps for bugsnag

Author: hawkrives

fastlane/lib/util.rb

@@ -64,6 +64,70 @@ def propagate_version(**args)
   end
 end
 
+# Generate argument values for the generate_sourcemap and upload_sourcemap_to_bugsnag lanes
+def get_sourcemap_args
+  # The cwd is /fastlane. I don't know why entry_file doesn't need to be ../, but
+  # I believe that watchman finds the project root and automatically looks there
+  case lane_context[:PLATFORM_NAME]
+  when :android
+    platform = 'android'
+    entry_file = 'index.android.js'
+    bundle_output = '../android-release.bundle'
+    sourcemap_output = '../android-release.bundle.map'
+    bundle_url = 'index.android.bundle'
+  when :ios
+    platform = 'ios'
+    entry_file = 'index.ios.js'
+    bundle_output = '../ios-release.bundle'
+    sourcemap_output = '../ios-release.bundle.map'
+    bundle_url = 'main.jsbundle'
+  end
+
+  {
+    platform: platform,
+    entry_file: entry_file,
+    bundle_output: bundle_output,
+    sourcemap_output: sourcemap_output,
+    bundle_url: bundle_url,
+  }
+end
+
+# Use react-native cli to generate the source map
+def generate_sourcemap
+  args = get_sourcemap_args
+
+  cmd = [
+    'npx react-native bundle',
+    '--dev false',
+    "--platform '#{args[:platform]}'",
+    "--entry-file '#{args[:entry_file]}'",
+    "--bundle-output '#{args[:bundle_output]}'",
+    "--sourcemap-output '#{args[:sourcemap_output]}'",
+  ].join ' '
+
+  FastlaneCore::CommandExecutor.execute(command: cmd,
+                                        print_all: true,
+                                        print_command: true)
+end
+
+# Upload source map to Bugsnag
+def upload_sourcemap_to_bugsnag
+  args = get_sourcemap_args
+
+  cmd = [
+    'npx bugsnag-sourcemaps upload',
+    "--api-key '#{ENV['BUGSNAG_KEY']}'",
+    "--minified-file '#{args[:bundle_output]}'",
+    "--source-map '#{args[:sourcemap_output]}'",
+    "--minified-url '#{args[:bundle_url]}'",
+    '--upload-sources',
+  ].join ' '
+
+  FastlaneCore::CommandExecutor.execute(command: cmd,
+                                        print_all: true,
+                                        print_command: true)
+end
+
 # last_git_tag returns the most recent tag, chronologically.
 # newest_tag returns the most recent tag *on this branch*.
 def newest_tag

fastlane/platforms/android.rb

@@ -39,6 +39,11 @@
     submit(track: 'alpha')
   end
 
+  desc 'Bundle an Android sourcemap'
+  lane :sourcemap do
+    generate_sourcemap
+  end
+
   desc 'Run the appropriate action on CI'
   lane :'ci-run' do
     # prepare for the bright future with signed android betas

fastlane/platforms/ios.rb

@@ -49,6 +49,11 @@
     end
   end
 
+  desc 'Bundle an iOS sourcemap'
+  lane :sourcemap do
+    generate_sourcemap
+  end
+
   desc 'Upload dYSM symbols to Bugsnag from Apple'
   lane :refresh_dsyms do
     download_dsyms