bootstrap: do not expand process.argv[1] for snapshot entry points

In applications with entry points deserialized from snapshots,
they don't need an additional CLI argument for the entry point script
so process.argv[1] is going to be other user-defiend arguments.
We could consider copying process.argv[0] as process.argv[1] like
what we do for single executable applications, but for now just
don't exapnd it so it's easier to backport to previous releases.
PR-URL: #47466
Reviewed-By: Colin Ihrig <cjihrig@gmail.com>
Reviewed-By: Chengzhong Wu <legendecas@gmail.com>

Author: joyeecheung

lib/internal/v8/startup_snapshot.js

@@ -90,7 +90,8 @@ function setDeserializeMainFunction(callback, data) {
 
 // This should be in sync with run_main_module.js until we make that
 // a built-in main function.
-prepareMainThreadExecution(true);
+// TODO(joyeecheung): make a copy of argv[0] and insert it as argv[1].
+prepareMainThreadExecution(false);
 markBootstrapComplete();
 callback(data);
 });

test/parallel/test-snapshot-argv1.js

@@ -0,0 +1,58 @@
+'use strict';
+
+// This tests snapshot JS API using the example in the docs.
+
+require('../common');
+constassert=require('assert');
+const{ spawnSync }=require('child_process');
+consttmpdir=require('../common/tmpdir');
+constpath=require('path');
+constfs=require('fs');
+
+tmpdir.refresh();
+constblobPath=path.join(tmpdir.path,'snapshot.blob');
+constcode=`
+require('v8').startupSnapshot.setDeserializeMainFunction(() => {
+ console.log(JSON.stringify(process.argv));
+});
+`;
+{
+fs.writeFileSync(path.join(tmpdir.path,'entry.js'),code,'utf8');
+constchild=spawnSync(process.execPath,[
+'--snapshot-blob',
+blobPath,
+'--build-snapshot',
+'entry.js',
+],{
+cwd: tmpdir.path
+});
+if(child.status!==0){
+console.log(child.stderr.toString());
+console.log(child.stdout.toString());
+assert.strictEqual(child.status,0);
+}
+conststats=fs.statSync(path.join(tmpdir.path,'snapshot.blob'));
+assert(stats.isFile());
+}
+
+{
+constchild=spawnSync(process.execPath,[
+'--snapshot-blob',
+blobPath,
+'argv1',
+'argv2',
+],{
+cwd: tmpdir.path,
+env: {
+ ...process.env,
+}
+});
+
+conststdout=JSON.parse(child.stdout.toString().trim());
+assert.deepStrictEqual(stdout,[
+process.execPath,
+'argv1',
+'argv2',
+]);
+assert.strictEqual(child.status,0);
+}