Add `--smol` flag

6 files changed, 14 insertions, 1 deletions

diff --git a/src/bun.js/javascript.zig b/src/bun.js/javascript.zig
index 3534a5316..cfa791d63 100644
--- a/src/bun.js/javascript.zig
+++ b/src/bun.js/javascript.zig
@@ -908,6 +908,7 @@ pub const VirtualMachine = struct {
         _log: ?*logger.Log,
         env_loader: ?*DotEnv.Loader,
         store_fd: bool,
+        smol: bool,
     ) !*VirtualMachine {
         var log: *logger.Log = undefined;
         if (_log) |__log| {
@@ -987,7 +988,7 @@ pub const VirtualMachine = struct {
             @intCast(i32, global_classes.len),
             vm.console,
             -1,
-            false,
+            smol,
         );
         vm.regular_event_loop.global = vm.global;
         vm.regular_event_loop.virtual_machine = vm;
diff --git a/src/bun_js.zig b/src/bun_js.zig
index 72b7f8de9..79f1c2596 100644
--- a/src/bun_js.zig
+++ b/src/bun_js.zig
@@ -151,6 +151,7 @@ pub const Run = struct {
                 ctx.log,
                 null,
                 ctx.debug.hot_reload != .none,
+                ctx.runtime_options.smol,
             ),
             .arena = arena,
             .ctx = ctx,
diff --git a/src/cli.zig b/src/cli.zig
index f0cc47918..0c093681a 100644
--- a/src/cli.zig
+++ b/src/cli.zig
@@ -153,6 +153,7 @@ pub const Arguments = struct {
         clap.parseParam("-l, --loader <STR>...             Parse files with .ext:loader, e.g. --loader .js:jsx. Valid loaders: js, jsx, ts, tsx, json, toml, text, file, wasm, napi") catch unreachable,
         clap.parseParam("-u, --origin <STR>                Rewrite import URLs to start with --origin. Default: \"\"") catch unreachable,
         clap.parseParam("-p, --port <STR>                  Port to serve bun's dev server on. Default: \"3000\"") catch unreachable,
+        clap.parseParam("--smol                            Use less memory, but run garbage collection more often") catch unreachable,
         clap.parseParam("--minify                          Minify (experimental)") catch unreachable,
         clap.parseParam("--minify-syntax                   Minify syntax and inline data (experimental)") catch unreachable,
         clap.parseParam("--minify-whitespace               Minify whitespace (experimental)") catch unreachable,
@@ -479,6 +480,8 @@ pub const Arguments = struct {
             } else if (preloads.len > 0) {
                 ctx.preloads = preloads;
             }
+
+            ctx.runtime_options.smol = args.flag("--smol");
         }
 
         if (opts.port != null and opts.origin == null) {
@@ -960,10 +963,15 @@ pub const Command = struct {
         debug: DebugOptions = DebugOptions{},
         test_options: TestOptions = TestOptions{},
         bundler_options: BundlerOptions = BundlerOptions{},
+        runtime_options: RuntimeOptions = RuntimeOptions{},
 
         preloads: []const string = &[_]string{},
         has_loaded_global_config: bool = false,
 
+        pub const RuntimeOptions = struct {
+            smol: bool = false,
+        };
+
         pub const BundlerOptions = struct {
             compile: bool = false,
 
diff --git a/src/cli/test_command.zig b/src/cli/test_command.zig
index 3c6db7fc2..5314c6e52 100644
--- a/src/cli/test_command.zig
+++ b/src/cli/test_command.zig
@@ -493,6 +493,7 @@ pub const TestCommand = struct {
             // in the future we should investigate if refactoring this to not
             // rely on the dir fd yields a performance improvement
             true,
+            ctx.runtime_options.smol,
         );
         vm.argv = ctx.passthrough;
         vm.preload = ctx.preloads;
diff --git a/src/http.zig b/src/http.zig
index b1d97c382..ff67d8ce5 100644
--- a/src/http.zig
+++ b/src/http.zig
@@ -1472,6 +1472,7 @@ pub const RequestContext = struct {
                 handler.log,
                 handler.env_loader,
                 true,
+                false,
             ) catch |err| {
                 handler.handleJSError(.create_vm, err) catch {};
                 javascript_disabled = true;
diff --git a/src/js_ast.zig b/src/js_ast.zig
index 0007cf2ad..357f11223 100644
--- a/src/js_ast.zig
+++ b/src/js_ast.zig
@@ -9627,6 +9627,7 @@ pub const Macro = struct {
                 log,
                 env,
                 false,
+                false,
             );
 
             _vm.enableMacroMode();