Hacking.

Author: davidmorgan

build_runner/bin/src/commands/generate_build_script.dart

@@ -36,7 +36,9 @@ class GenerateBuildScript extends Command<int> {
       ..writeAsStringSync(buildScript.script);
     File(scriptDepsPath)
       ..createSync(recursive: true)
-      ..writeAsStringSync(buildScript.dependencyPaths.join('\n'));
+      ..writeAsStringSync(
+        '$scriptLocation: ${buildScript.dependencyPaths.join(' ')}',
+      );
     print(p.absolute(scriptLocation));
     return 0;
   }

build_runner/lib/src/build_script_generate/bootstrap.dart

@@ -78,7 +78,9 @@ Future<int> _generateAndRun(
           ..writeAsStringSync(newContents.script);
         File(scriptDepsPath)
           ..createSync(recursive: true)
-          ..writeAsStringSync(newContents.dependencyPaths.join('\n'));
+          ..writeAsStringSync(
+            '$scriptLocation: ${newContents.dependencyPaths.join(' ')}',
+          );
         // Delete the kernel file so it will be rebuilt.
         final kernelFile = File(scriptKernelLocation);
         if (kernelFile.existsSync()) {