fix(lint): resolve no-unused-expressions errors (#23127)

## Summary

Fixes all oxlint `no-unused-expressions` violations across the codebase
by:
- Adding an oxlint override to disable the rule for
`src/js/builtins/**`, where special syntax markers like `$getter`,
`$constructor`, etc. are intentionally used as standalone expressions
- Converting short-circuit expressions (`condition && fn()`) to proper
if statements for improved code clarity
- Wrapping intentional property access side effects (e.g.,
`this.stdio;`, `err.stack;`) with the `void` operator
- Converting ternary expressions used for control flow to if/else
statements

## Test plan

- [x] `bun lint` passes with no errors

🤖 Generated with [Claude Code](https://claude.com/claude-code)

---------

Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>

oxlint.json

@@ -78,6 +78,12 @@
         "no-empty-file": "off",
         "no-unnecessary-await": "off"
       }
+    },
+    {
+      "files": ["src/js/builtins/**"],
+      "rules": {
+        "no-unused-expressions": "off"
+      }
     }
   ]
 }

src/js/bun/sqlite.ts

@@ -299,9 +299,11 @@ class Statement {
 
     var arg0 = args[0];
 
-    !isArray(arg0) && (!arg0 || typeof arg0 !== "object" || isTypedArray(arg0))
-      ? this.#raw.run(internalFieldTuple, args)
-      : this.#raw.run(internalFieldTuple, ...args);
+    if (!isArray(arg0) && (!arg0 || typeof arg0 !== "object" || isTypedArray(arg0))) {
+      this.#raw.run(internalFieldTuple, args);
+    } else {
+      this.#raw.run(internalFieldTuple, ...args);
+    }
 
     return createChangesObject();
   }
@@ -516,9 +518,11 @@ class Database implements SqliteTypes.Database {
     }
 
     var arg0 = params[0];
-    !isArray(arg0) && (!arg0 || typeof arg0 !== "object" || isTypedArray(arg0))
-      ? SQL.run(this.#handle, this.#internalFlags, internalFieldTuple, query, params)
-      : SQL.run(this.#handle, this.#internalFlags, internalFieldTuple, query, ...params);
+    if (!isArray(arg0) && (!arg0 || typeof arg0 !== "object" || isTypedArray(arg0))) {
+      SQL.run(this.#handle, this.#internalFlags, internalFieldTuple, query, params);
+    } else {
+      SQL.run(this.#handle, this.#internalFlags, internalFieldTuple, query, ...params);
+    }
 
     return createChangesObject();
   }

src/js/internal/util/inspect.js

@@ -339,7 +339,7 @@ const codes = {}; // exported from errors.js
     ErrorCaptureStackTrace(err);
     Error.stackTraceLimit = userStackTraceLimit; // Reset the limit
     err.name = `${TypeError.name} [${sym}]`; // Add the error code to the name to include it in the stack trace.
-    err.stack; // Access the stack to generate the error message including the error code from the name.
+    void err.stack; // Access the stack to generate the error message including the error code from the name.
     delete err.name; // Reset the name to the actual name.
     error.code = sym;
     return error;
@@ -987,7 +987,7 @@ function initializeWellKnownPrototypes() {
 function getConstructorName(obj, ctx, recurseTimes, protoProps) {
   let firstProto;
   const tmp = obj;
-  wellKnownPrototypes ?? initializeWellKnownPrototypes();
+  if (!wellKnownPrototypes) initializeWellKnownPrototypes();
   while (obj || isUndetectableObject(obj)) {
     const wellKnownPrototypeNameAndConstructor = wellKnownPrototypes.get(obj);
     if (wellKnownPrototypeNameAndConstructor != null) {

src/js/node/_http_incoming.ts

@@ -393,12 +393,12 @@ const IncomingMessagePrototype = {
     // noop
   },
   setTimeout(msecs, callback) {
-    this.take;
+    void this.take;
     const req = this[kHandle] || this[webRequestOrResponse];
 
     if (req) {
       setRequestTimeout(req, Math.ceil(msecs / 1000));
-      typeof callback === "function" && this.once("timeout", callback);
+      if (typeof callback === "function") this.once("timeout", callback);
     }
     return this;
   },

src/js/node/_http_server.ts

@@ -589,7 +589,7 @@ Server.prototype[kRealListen] = function (tls, port, host, socketPath, reusePort
         }
         function onClose() {
           didFinish = true;
-          resolveFunction && resolveFunction();
+          if (resolveFunction) resolveFunction();
         }
 
         setCloseCallback(http_res, onClose);
@@ -732,7 +732,7 @@ Server.prototype.setTimeout = function (msecs, callback) {
   const server = this[serverSymbol];
   if (server) {
     setServerIdleTimeout(server, Math.ceil(msecs / 1000));
-    typeof callback === "function" && this.once("timeout", callback);
+    if (typeof callback === "function") this.once("timeout", callback);
   } else {
     (this[kDeferredTimeouts] ??= []).push({ msecs, callback });
   }
@@ -905,7 +905,7 @@ const NodeHTTPServerSocket = class Socket extends Duplex {
   }
   #onCloseForDestroy(closeCallback) {
     this.#onClose();
-    $isCallable(closeCallback) && closeCallback();
+    if ($isCallable(closeCallback)) closeCallback();
   }
 
   _onTimeout() {
@@ -937,7 +937,7 @@ const NodeHTTPServerSocket = class Socket extends Duplex {
   _destroy(err, callback) {
     const handle = this[kHandle];
     if (!handle) {
-      $isCallable(callback) && callback(err);
+      if ($isCallable(callback)) callback(err);
       return;
     }
     handle.ondata = undefined;
@@ -947,7 +947,7 @@ const NodeHTTPServerSocket = class Socket extends Duplex {
       if ($isCallable(onclose)) {
         onclose.$call(handle);
       }
-      $isCallable(callback) && callback(err);
+      if ($isCallable(callback)) callback(err);
       return;
     }
 
@@ -1081,7 +1081,8 @@ const NodeHTTPServerSocket = class Socket extends Duplex {
     } catch (e) {
       err = e;
     }
-    err ? _callback(err) : _callback();
+    if (err) _callback(err);
+    else _callback();
   }
 
   pause() {
@@ -1510,7 +1511,7 @@ ServerResponse.prototype._finish = function () {
 
 ServerResponse.prototype.detachSocket = function (socket) {
   if (socket._httpMessage === this) {
-    socket[kCloseCallback] && (socket[kCloseCallback] = undefined);
+    if (socket[kCloseCallback]) socket[kCloseCallback] = undefined;
     socket.removeListener("close", onServerResponseClose);
     socket._httpMessage = null;
   }

src/js/node/child_process.ts

@@ -1340,7 +1340,7 @@ class ChildProcess extends EventEmitter {
 
           if (hasSocketsToEagerlyLoad) {
             process.nextTick(() => {
-              this.stdio;
+              void this.stdio;
               $debug("ChildProcess: onExit", exitCode, signalCode, err, this.pid);
             });
           }

src/js/node/fs.ts

@@ -731,10 +731,11 @@ const realpathSync: typeof import("node:fs").realpathSync =
         if (options) {
           if (typeof options === "string") encoding = options;
           else encoding = options?.encoding;
-          encoding &&
+          if (encoding) {
             (assertEncodingForWindows ?? $newZigFunction("bun.js/node/types.zig", "jsAssertEncodingValid", 1))(
               encoding,
             );
+          }
         }
         // This function is ported 1:1 from node.js, to emulate how it is unable to
         // resolve subst drives to their underlying location. The native call is
@@ -852,10 +853,11 @@ const realpath: typeof import("node:fs").realpath =
         if (options) {
           if (typeof options === "string") encoding = options;
           else encoding = options?.encoding;
-          encoding &&
+          if (encoding) {
             (assertEncodingForWindows ?? $newZigFunction("bun.js/node/types.zig", "jsAssertEncodingValid", 1))(
               encoding,
             );
+          }
         }
         if (p instanceof URL) {
           if (p.pathname.indexOf("%00") != -1) {

src/js/node/tls.ts

@@ -504,7 +504,7 @@ function TLSSocket(socket?, options?) {
   this._SNICallback = undefined;
   this.servername = undefined;
   this.authorized = false;
-  this.authorizationError;
+  void this.authorizationError;
   this[krenegotiationDisabled] = undefined;
   this.encrypted = true;
 
@@ -582,7 +582,7 @@ TLSSocket.prototype.renegotiate = function renegotiate(options, callback) {
   if (this[krenegotiationDisabled]) {
     // if renegotiation is disabled should emit error event in nextTick for nodejs compatibility
     const error = $ERR_TLS_RENEGOTIATION_DISABLED();
-    typeof callback === "function" && process.nextTick(callback, error);
+    if (typeof callback === "function") process.nextTick(callback, error);
     return false;
   }
 
@@ -606,11 +606,11 @@ TLSSocket.prototype.renegotiate = function renegotiate(options, callback) {
   try {
     socket.renegotiate?.();
     // if renegotiate is successful should emit secure event when done
-    typeof callback === "function" && this.once("secure", () => callback(null));
+    if (typeof callback === "function") this.once("secure", () => callback(null));
     return true;
   } catch (err) {
     // if renegotiate fails should emit error event in nextTick for nodejs compatibility
-    typeof callback === "function" && process.nextTick(callback, err);
+    if (typeof callback === "function") process.nextTick(callback, err);
     return false;
   }
 };

src/js/node/url.ts

@@ -871,7 +871,6 @@ Url.prototype.parseHost = function parseHost() {
   if (host) this.hostname = host;
 };
 
-"".charCodeAt;
 // function fileURLToPath(...args) {
 //   // Since we use WTF::URL::fileSystemPath directly in Bun.fileURLToPath, we don't get invalid windows
 //   // path checking. We patch this in to `node:url` for compatibility. Note that

src/js/thirdparty/node-fetch.ts

@@ -69,25 +69,25 @@ class Response extends WebResponse {
 
   async arrayBuffer() {
     // load the getter
-    this.body;
+    void this.body;
     return await super.arrayBuffer();
   }
 
   async blob() {
     // load the getter
-    this.body;
+    void this.body;
     return await super.blob();
   }
 
   async formData() {
     // load the getter
-    this.body;
+    void this.body;
     return await super.formData();
   }
 
   async json() {
     // load the getter
-    this.body;
+    void this.body;
     return await super.json();
   }
 
@@ -95,13 +95,13 @@ class Response extends WebResponse {
   // but is still used by some libraries and frameworks (like Astro)
   async buffer() {
     // load the getter
-    this.body;
+    void this.body;
     return new $Buffer(await super.arrayBuffer());
   }
 
   async text() {
     // load the getter
-    this.body;
+    void this.body;
     return await super.text();
   }
 

src/js/thirdparty/ws.js

@@ -262,12 +262,12 @@ class BunWebSocket extends EventEmitter {
       this.#ws.send(normalizeData(data, opts), opts?.compress);
     } catch (error) {
       // Node.js APIs expect callback arguments to be called after the current stack pops
-      typeof cb === "function" && process.nextTick(cb, error);
+      if (typeof cb === "function") process.nextTick(cb, error);
       return;
     }
     // deviation: this should be called once the data is written, not immediately
     // Node.js APIs expect callback arguments to be called after the current stack pops
-    typeof cb === "function" && process.nextTick(cb, null);
+    if (typeof cb === "function") process.nextTick(cb, null);
   }
 
   close(code, reason) {
@@ -393,7 +393,7 @@ class BunWebSocket extends EventEmitter {
       return;
     }
 
-    typeof cb === "function" && cb();
+    if (typeof cb === "function") cb();
   }
 
   pong(data, mask, cb) {
@@ -422,7 +422,7 @@ class BunWebSocket extends EventEmitter {
       return;
     }
 
-    typeof cb === "function" && cb();
+    if (typeof cb === "function") cb();
   }
 
   pause() {
@@ -792,7 +792,7 @@ class BunWebSocketMocked extends EventEmitter {
       this.#bufferedAmount -= chunk.length;
       this.#enquedMessages.shift();
 
-      typeof cb === "function" && queueMicrotask(cb);
+      if (typeof cb === "function") queueMicrotask(cb);
     }
   }
 
@@ -814,11 +814,11 @@ class BunWebSocketMocked extends EventEmitter {
     try {
       this.#ws.ping(data);
     } catch (error) {
-      typeof cb === "function" && cb(error);
+      if (typeof cb === "function") cb(error);
       return;
     }
 
-    typeof cb === "function" && cb();
+    if (typeof cb === "function") cb();
   }
 
   pong(data, mask, cb) {
@@ -839,11 +839,11 @@ class BunWebSocketMocked extends EventEmitter {
     try {
       this.#ws.pong(data);
     } catch (error) {
-      typeof cb === "function" && cb(error);
+      if (typeof cb === "function") cb(error);
       return;
     }
 
-    typeof cb === "function" && cb();
+    if (typeof cb === "function") cb();
   }
 
   send(data, opts, cb) {
@@ -868,7 +868,7 @@ class BunWebSocketMocked extends EventEmitter {
         return;
       }
 
-      typeof cb === "function" && process.nextTick(cb);
+      if (typeof cb === "function") process.nextTick(cb);
     } else if (this.#state === ReadyState_CONNECTING) {
       // not connected yet
       this.#enquedMessages.push([data, opts?.compress, cb]);