fix: do not pass --watch for non-worker mode

packages/typescript/internal/ts_project.bzl

@@ -79,7 +79,7 @@ def _ts_project_impl(ctx):
         arguments.use_param_file("@%s", use_always = True)
         arguments.set_param_file_format("multiline")
         execution_requirements["supports-workers"] = "1"
-        execution_requirements["worker-key-mnemonic"] = "TsProjectMnemonic"
+        execution_requirements["worker-key-mnemonic"] = "TsProject"
         progress_prefix = "Compiling TypeScript project (worker mode)"
 
     generated_srcs = False
@@ -618,7 +618,6 @@ def ts_project_macro(
                 "--outDir",
                 "$(RULEDIR)",
                 # FIXME: what about other settings like declaration_dir, root_dir, etc
-                "--watch",
             ],
         )
 

packages/typescript/internal/worker/worker_adapter.js

@@ -1,16 +1,14 @@
 const child_process = require('child_process');
-
+const MNEMONIC = 'TsProject';
 const worker = require('./worker');
 
 const workerArg = process.argv.indexOf('--persistent_worker')
 if (workerArg > 0) {
-  process.argv.splice(workerArg, 1)
+  process.argv.splice(workerArg, 1, '--watch')
 
   if (process.platform !== 'linux' && process.platform !== 'darwin') {
     throw new Error('Worker mode is only supported on unix type systems.');
   }
-
-  worker.runWorkerLoop(awaitOneBuild);
 }
 
 const [tscBin, ...tscArgs] = process.argv.slice(2);
@@ -20,7 +18,6 @@ const child = child_process.spawn(
     tscArgs,
     {stdio: 'pipe'},
 );
-
 function awaitOneBuild() {
   child.kill('SIGCONT')
 
@@ -49,4 +46,25 @@ function awaitOneBuild() {
     };
     child.stdout.on('data', awaitBuild);
   });
+}
+
+async function main() {
+  // Bazel will pass a special argument to the program when it's running us as a worker
+  if (workerArg > 0) {
+    worker.log(`Running ${MNEMONIC} as a Bazel worker`);
+
+    worker.runWorkerLoop(awaitOneBuild);
+  } else {
+    // Running standalone so stdout is available as usual
+    console.log(`Running ${MNEMONIC} as a standalone process`);
+    console.error(
+        `Started a new process to perform this action. Your build might be misconfigured, try
+      --strategy=${MNEMONIC}=worker`);
+
+    child.on('exit', code => process.exit(code));
+  }
+}
+
+if (require.main === module) {
+  main();
 }