From 29393b884e889c5c2d33b3894d5a3653a6e19f27 Mon Sep 17 00:00:00 2001
From: michael <michael@scripthungry.com>
Date: Sun, 7 Dec 2025 16:25:30 +0000
Subject: [PATCH 1/2] Port :erlang.exit/1 to JS

---
 assets/js/erlang/erlang.mjs                   |  8 +++++
 assets/js/errors/exit_error.mjs               | 11 +++++++
 .../ex_js_consistency/erlang/erlang_test.exs  | 29 +++++++++++++++++++
 test/javascript/erlang/erlang_test.mjs        | 21 ++++++++++++++
 4 files changed, 69 insertions(+)
 create mode 100644 assets/js/errors/exit_error.mjs

diff --git a/assets/js/erlang/erlang.mjs b/assets/js/erlang/erlang.mjs
index 4530d1a45a..8423a89f21 100644
--- a/assets/js/erlang/erlang.mjs
+++ b/assets/js/erlang/erlang.mjs
@@ -2,6 +2,7 @@
 
 import Bitstring from "../bitstring.mjs";
 import HologramBoxedError from "../errors/boxed_error.mjs";
+import HologramExitError from "../errors/exit_error.mjs";
 import HologramInterpreterError from "../errors/interpreter_error.mjs";
 import Interpreter from "../interpreter.mjs";
 import Type from "../type.mjs";
@@ -584,6 +585,13 @@ const Erlang = {
   // End error/2
   // Deps: []
 
+  // Start exit/1
+  "exit/1": (reason) => {
+    throw new HologramExitError(reason);
+  },
+  // End exit/1
+  // Deps: []
+
   // Start float/1
   "float/1": (number) => {
     if (Type.isInteger(number)) {
diff --git a/assets/js/errors/exit_error.mjs b/assets/js/errors/exit_error.mjs
new file mode 100644
index 0000000000..76681bbecb
--- /dev/null
+++ b/assets/js/errors/exit_error.mjs
@@ -0,0 +1,11 @@
+"use strict";
+
+export default class HologramExitError extends Error {
+  constructor(reason) {
+    super("");
+
+    this.name = "HologramExitError";
+    this.reason = reason;
+    this.message = `exit with reason: ${JSON.stringify(reason)}`;
+  }
+}
diff --git a/test/elixir/hologram/ex_js_consistency/erlang/erlang_test.exs b/test/elixir/hologram/ex_js_consistency/erlang/erlang_test.exs
index 635145c6c5..7aba4d5966 100644
--- a/test/elixir/hologram/ex_js_consistency/erlang/erlang_test.exs
+++ b/test/elixir/hologram/ex_js_consistency/erlang/erlang_test.exs
@@ -1907,6 +1907,35 @@ defmodule Hologram.ExJsConsistency.Erlang.ErlangTest do
     end
   end
 
+  describe "exit/1" do
+    test "raises with atom reason" do
+      try do
+        :erlang.exit(:normal)
+        flunk("expected exit to be raised")
+      catch
+        :exit, reason -> assert reason == :normal
+      end
+    end
+
+    test "raises with tuple reason" do
+      try do
+        :erlang.exit({:error, :reason})
+        flunk("expected exit to be raised")
+      catch
+        :exit, reason -> assert reason == {:error, :reason}
+      end
+    end
+
+    test "raises with integer reason" do
+      try do
+        :erlang.exit(1)
+        flunk("expected exit to be raised")
+      catch
+        :exit, reason -> assert reason == 1
+      end
+    end
+  end
+
   describe "float/1" do
     test "converts integer to float" do
       assert :erlang.float(1) == 1.0
diff --git a/test/javascript/erlang/erlang_test.mjs b/test/javascript/erlang/erlang_test.mjs
index ba4c1dd941..985421decf 100644
--- a/test/javascript/erlang/erlang_test.mjs
+++ b/test/javascript/erlang/erlang_test.mjs
@@ -12,6 +12,7 @@ import {
 
 import Bitstring from "../../../assets/js/bitstring.mjs";
 import Erlang from "../../../assets/js/erlang/erlang.mjs";
+import HologramExitError from "../../../assets/js/errors/exit_error.mjs";
 import HologramInterpreterError from "../../../assets/js/errors/interpreter_error.mjs";
 import Interpreter from "../../../assets/js/interpreter.mjs";
 import Type from "../../../assets/js/type.mjs";
@@ -2628,6 +2629,26 @@ describe("Erlang", () => {
     assertBoxedError(() => error(reason, args), "MyError", "my message");
   });
 
+  it("exit/1", () => {
+    const exit = Erlang["exit/1"];
+    const reason = Type.atom("normal");
+
+    assert.throws(
+      () => exit(reason),
+      HologramExitError,
+    );
+  });
+
+  it("exit/1 with tuple reason", () => {
+    const exit = Erlang["exit/1"];
+    const reason = Type.tuple([Type.atom("error"), Type.atom("reason")]);
+
+    assert.throws(
+      () => exit(reason),
+      HologramExitError,
+    );
+  });
+
   describe("float/1", () => {
     const float = Erlang["float/1"];
 

From 221fcd5055d07dc0f2bed93049cfb1ffc36ec3ce Mon Sep 17 00:00:00 2001
From: Michael Ward <michael@scripthungry.com>
Date: Sun, 7 Dec 2025 17:17:56 +0000
Subject: [PATCH 2/2] Fix: Format erlang_test.mjs

---
 test/javascript/erlang/erlang_test.mjs | 10 ++--------
 1 file changed, 2 insertions(+), 8 deletions(-)

diff --git a/test/javascript/erlang/erlang_test.mjs b/test/javascript/erlang/erlang_test.mjs
index 985421decf..c9fb3df163 100644
--- a/test/javascript/erlang/erlang_test.mjs
+++ b/test/javascript/erlang/erlang_test.mjs
@@ -2633,20 +2633,14 @@ describe("Erlang", () => {
     const exit = Erlang["exit/1"];
     const reason = Type.atom("normal");
 
-    assert.throws(
-      () => exit(reason),
-      HologramExitError,
-    );
+    assert.throws(() => exit(reason), HologramExitError);
   });
 
   it("exit/1 with tuple reason", () => {
     const exit = Erlang["exit/1"];
     const reason = Type.tuple([Type.atom("error"), Type.atom("reason")]);
 
-    assert.throws(
-      () => exit(reason),
-      HologramExitError,
-    );
+    assert.throws(() => exit(reason), HologramExitError);
   });
 
   describe("float/1", () => {