Support `bun run --if-present` (#6248)

* Support --if-present
Closes #5670

* More robust tests, handle more cases

2 files changed, 11 insertions, 0 deletions

diff --git a/src/cli.zig b/src/cli.zig
index 9982e5e7f..a05fb3768 100644
--- a/src/cli.zig
+++ b/src/cli.zig
@@ -196,6 +196,7 @@ pub const Arguments = struct {
         clap.parseParam("--inspect <STR>?                  Activate Bun's Debugger") catch unreachable,
         clap.parseParam("--inspect-wait <STR>?             Activate Bun's Debugger, wait for a connection before executing") catch unreachable,
         clap.parseParam("--inspect-brk <STR>?              Activate Bun's Debugger, set breakpoint on first line of code and wait") catch unreachable,
+        clap.parseParam("--if-present                      Exit if the entrypoint does not exist") catch unreachable,
         clap.parseParam("<POS>...                          ") catch unreachable,
     };
 
@@ -538,6 +539,7 @@ pub const Arguments = struct {
                 ctx.preloads = preloads;
             }
 
+            ctx.runtime_options.if_present = args.flag("--if-present");
             ctx.runtime_options.smol = args.flag("--smol");
             if (args.option("--inspect")) |inspect_flag| {
                 ctx.runtime_options.debugger = if (inspect_flag.len == 0)
@@ -1022,6 +1024,7 @@ pub const Command = struct {
     pub const RuntimeOptions = struct {
         smol: bool = false,
         debugger: Debugger = .{ .unspecified = {} },
+        if_present: bool = false,
     };
 
     pub const Context = struct {
@@ -1666,6 +1669,10 @@ pub const Command = struct {
                     Global.exit(1);
                 }
 
+                if (ctx.runtime_options.if_present) {
+                    return;
+                }
+
                 if (was_js_like) {
                     Output.prettyErrorln("<r><red>error<r><d>:<r> module not found \"<b>{s}<r>\"", .{
                         ctx.positionals[0],
diff --git a/src/cli/run_command.zig b/src/cli/run_command.zig
index 1ef1342c0..19046e292 100644
--- a/src/cli/run_command.zig
+++ b/src/cli/run_command.zig
@@ -1160,6 +1160,10 @@ pub const RunCommand = struct {
             }
         }
 
+        if (ctx.runtime_options.if_present) {
+            return true;
+        }
+
         if (comptime log_errors) {
             Output.prettyError("<r><red>error<r><d>:<r> missing script \"<b>{s}<r>\"\n", .{script_name_to_search});
             Global.exit(1);