Add test that checks JIT is enabled for JavaScriptCore and crashes if it isn't

integration/apps/bun-create-next.sh

@@ -1,12 +1,14 @@
 #!/bin/bash
 
+# The important part of this test: make sure that Bun.js successfully loads
+# The most likely reason for this test to fail is that something broke in the JavaScriptCore <> Bun integration
 killall -9 $(basename $BUN_BIN) || echo "";
 
 rm -rf /tmp/next-app;
 mkdir -p /tmp/next-app;
 $BUN_BIN create next /tmp/next-app;
 cd /tmp/next-app;
-$BUN_BIN --port 8087 &
+BUN_CRASH_WITHOUT_JIT=1 $BUN_BIN --port 8087 &
 sleep 0.005
 
 curl --fail http://localhost:8087/ && killall -9 $(basename $BUN_BIN) && echo "✅ bun create next passed."

integration/apps/bun-create-react.sh

@@ -6,7 +6,7 @@ rm -rf /tmp/react-app;
 mkdir -p /tmp/react-app;
 $BUN_BIN create react /tmp/react-app;
 cd /tmp/react-app;
-$BUN_BIN --port 8087 &
+BUN_CRASH_WITHOUT_JIT=1 $BUN_BIN --port 8087 &
 sleep 0.005
 
 curl --fail http://localhost:8087/ && killall -9 $(basename $BUN_BIN) && echo "✅ bun create react passed."

src/http.zig

@@ -1205,6 +1205,9 @@ pub const RequestContext = struct {
             var module_map = ZigGlobalObject.getModuleRegistryMap(vm.global);
             if (!VM.isJITEnabled()) {
                 Output.prettyErrorln("<red><r>warn:<r> JIT is disabled,,,this is a bug in Bun and/or a permissions problem. JS will run slower.", .{});
+                if (vm.bundler.env.map.get("BUN_CRASH_WITHOUT_JIT") != null) {
+                    Global.crash();
+                }
             }
 
             while (true) {