Update types, partially fix `typecheck` (#3551)

* Update types

* Remove caret

25 files changed, 270 insertions, 199 deletions

diff --git a/packages/bun-types/assert.d.ts b/packages/bun-types/assert.d.ts
index ae3b54ff2..658e7df5b 100644
--- a/packages/bun-types/assert.d.ts
+++ b/packages/bun-types/assert.d.ts
@@ -931,7 +931,11 @@ declare module "assert" {
      * instance of an `Error` then it will be thrown instead of the `AssertionError`.
      */
     // FIXME: assert.doesNotMatch is typed, but not in the browserify polyfill?
-    // function doesNotMatch(value: string, regExp: RegExp, message?: string | Error): void;
+    function doesNotMatch(
+      value: string,
+      regExp: RegExp,
+      message?: string | Error,
+    ): void;
 
     const strict: Omit<
       typeof assert,
diff --git a/packages/bun-types/ffi.d.ts b/packages/bun-types/ffi.d.ts
index 3e7e91534..9705e810b 100644
--- a/packages/bun-types/ffi.d.ts
+++ b/packages/bun-types/ffi.d.ts
@@ -344,6 +344,7 @@ declare module "bun:ffi" {
      *
      */
     u64_fast = 16,
+    function = 17,
   }
 
   type UNTYPED = never;
diff --git a/packages/bun-types/fs.d.ts b/packages/bun-types/fs.d.ts
index 5dfb2c7f2..379e0ef25 100644
--- a/packages/bun-types/fs.d.ts
+++ b/packages/bun-types/fs.d.ts
@@ -3932,100 +3932,141 @@ declare module "fs" {
   }
 
   export interface FSWatcher extends EventEmitter {
-      /**
-       * Stop watching for changes on the given `fs.FSWatcher`. Once stopped, the `fs.FSWatcher` object is no longer usable.
-       * @since v0.6.8
-       */
-      close(): void;
-
-      /**
-       * When called, requests that the Node.js event loop not exit so long as the <fs.FSWatcher> is active. Calling watcher.ref() multiple times will have no effect.
-       */
-      ref(): void;
-
-      /**
-       * When called, the active <fs.FSWatcher> object will not require the Node.js event loop to remain active. If there is no other activity keeping the event loop running, the process may exit before the <fs.FSWatcher> object's callback is invoked. Calling watcher.unref() multiple times will have no effect.
-       */
-      unref(): void;
-  
-      /**
-       * events.EventEmitter
-       *   1. change
-       *   2. error
-       */
-      addListener(event: string, listener: (...args: any[]) => void): this;
-      addListener(event: 'change', listener: (eventType: string, filename: string | Buffer) => void): this;
-      addListener(event: 'error', listener: (error: Error) => void): this;
-      addListener(event: 'close', listener: () => void): this;
-      on(event: string, listener: (...args: any[]) => void): this;
-      on(event: 'change', listener: (eventType: string, filename: string | Buffer) => void): this;
-      on(event: 'error', listener: (error: Error) => void): this;
-      on(event: 'close', listener: () => void): this;
-      once(event: string, listener: (...args: any[]) => void): this;
-      once(event: 'change', listener: (eventType: string, filename: string | Buffer) => void): this;
-      once(event: 'error', listener: (error: Error) => void): this;
-      once(event: 'close', listener: () => void): this;
-      prependListener(event: string, listener: (...args: any[]) => void): this;
-      prependListener(event: 'change', listener: (eventType: string, filename: string | Buffer) => void): this;
-      prependListener(event: 'error', listener: (error: Error) => void): this;
-      prependListener(event: 'close', listener: () => void): this;
-      prependOnceListener(event: string, listener: (...args: any[]) => void): this;
-      prependOnceListener(event: 'change', listener: (eventType: string, filename: string | Buffer) => void): this;
-      prependOnceListener(event: 'error', listener: (error: Error) => void): this;
-      prependOnceListener(event: 'close', listener: () => void): this;
-  }
-  /**
-     * Watch for changes on `filename`, where `filename` is either a file or a
-     * directory.
-     *
-     * The second argument is optional. If `options` is provided as a string, it
-     * specifies the `encoding`. Otherwise `options` should be passed as an object.
-     *
-     * The listener callback gets two arguments `(eventType, filename)`. `eventType`is either `'rename'` or `'change'`, and `filename` is the name of the file
-     * which triggered the event.
-     *
-     * On most platforms, `'rename'` is emitted whenever a filename appears or
-     * disappears in the directory.
-     *
-     * The listener callback is attached to the `'change'` event fired by `fs.FSWatcher`, but it is not the same thing as the `'change'` value of`eventType`.
-     *
-     * If a `signal` is passed, aborting the corresponding AbortController will close
-     * the returned `fs.FSWatcher`.
+    /**
+     * Stop watching for changes on the given `fs.FSWatcher`. Once stopped, the `fs.FSWatcher` object is no longer usable.
      * @since v0.6.8
-     * @param listener
      */
-      export function watch(
-        filename: PathLike,
-        options:
-            | (WatchOptions & {
-                  encoding: 'buffer';
-              })
-            | 'buffer',
-        listener?: WatchListener<Buffer>
-    ): FSWatcher;
+    close(): void;
+
     /**
-     * Watch for changes on `filename`, where `filename` is either a file or a directory, returning an `FSWatcher`.
-     * @param filename A path to a file or directory. If a URL is provided, it must use the `file:` protocol.
-     * @param options Either the encoding for the filename provided to the listener, or an object optionally specifying encoding, persistent, and recursive options.
-     * If `encoding` is not supplied, the default of `'utf8'` is used.
-     * If `persistent` is not supplied, the default of `true` is used.
-     * If `recursive` is not supplied, the default of `false` is used.
+     * When called, requests that the Node.js event loop not exit so long as the <fs.FSWatcher> is active. Calling watcher.ref() multiple times will have no effect.
      */
-    export function watch(filename: PathLike, options?: WatchOptions | BufferEncoding | null, listener?: WatchListener<string>): FSWatcher;
+    ref(): void;
+
     /**
-     * Watch for changes on `filename`, where `filename` is either a file or a directory, returning an `FSWatcher`.
-     * @param filename A path to a file or directory. If a URL is provided, it must use the `file:` protocol.
-     * @param options Either the encoding for the filename provided to the listener, or an object optionally specifying encoding, persistent, and recursive options.
-     * If `encoding` is not supplied, the default of `'utf8'` is used.
-     * If `persistent` is not supplied, the default of `true` is used.
-     * If `recursive` is not supplied, the default of `false` is used.
+     * When called, the active <fs.FSWatcher> object will not require the Node.js event loop to remain active. If there is no other activity keeping the event loop running, the process may exit before the <fs.FSWatcher> object's callback is invoked. Calling watcher.unref() multiple times will have no effect.
      */
-    export function watch(filename: PathLike, options: WatchOptions | string, listener?: WatchListener<string | Buffer>): FSWatcher;
+    unref(): void;
+
     /**
-     * Watch for changes on `filename`, where `filename` is either a file or a directory, returning an `FSWatcher`.
-     * @param filename A path to a file or directory. If a URL is provided, it must use the `file:` protocol.
+     * events.EventEmitter
+     *   1. change
+     *   2. error
      */
-    export function watch(filename: PathLike, listener?: WatchListener<string>): FSWatcher;
+    addListener(event: string, listener: (...args: any[]) => void): this;
+    addListener(
+      event: "change",
+      listener: (eventType: string, filename: string | Buffer) => void,
+    ): this;
+    addListener(event: "error", listener: (error: Error) => void): this;
+    addListener(event: "close", listener: () => void): this;
+    on(event: string, listener: (...args: any[]) => void): this;
+    on(
+      event: "change",
+      listener: (eventType: string, filename: string | Buffer) => void,
+    ): this;
+    on(event: "error", listener: (error: Error) => void): this;
+    on(event: "close", listener: () => void): this;
+    once(event: string, listener: (...args: any[]) => void): this;
+    once(
+      event: "change",
+      listener: (eventType: string, filename: string | Buffer) => void,
+    ): this;
+    once(event: "error", listener: (error: Error) => void): this;
+    once(event: "close", listener: () => void): this;
+    prependListener(event: string, listener: (...args: any[]) => void): this;
+    prependListener(
+      event: "change",
+      listener: (eventType: string, filename: string | Buffer) => void,
+    ): this;
+    prependListener(event: "error", listener: (error: Error) => void): this;
+    prependListener(event: "close", listener: () => void): this;
+    prependOnceListener(
+      event: string,
+      listener: (...args: any[]) => void,
+    ): this;
+    prependOnceListener(
+      event: "change",
+      listener: (eventType: string, filename: string | Buffer) => void,
+    ): this;
+    prependOnceListener(event: "error", listener: (error: Error) => void): this;
+    prependOnceListener(event: "close", listener: () => void): this;
+  }
+
+  type WatchOptions = {
+    encoding?: BufferEncoding;
+    persistent?: boolean;
+    recursive?: boolean;
+    signal?: AbortSignal;
+  };
+  type WatchEventType = "rename" | "change" | "error" | "close";
+  type WatchListener<T> = (
+    event: WatchEventType,
+    filename: T | Error | undefined,
+  ) => void;
+  /**
+   * Watch for changes on `filename`, where `filename` is either a file or a
+   * directory.
+   *
+   * The second argument is optional. If `options` is provided as a string, it
+   * specifies the `encoding`. Otherwise `options` should be passed as an object.
+   *
+   * The listener callback gets two arguments `(eventType, filename)`. `eventType`is either `'rename'` or `'change'`, and `filename` is the name of the file
+   * which triggered the event.
+   *
+   * On most platforms, `'rename'` is emitted whenever a filename appears or
+   * disappears in the directory.
+   *
+   * The listener callback is attached to the `'change'` event fired by `fs.FSWatcher`, but it is not the same thing as the `'change'` value of`eventType`.
+   *
+   * If a `signal` is passed, aborting the corresponding AbortController will close
+   * the returned `fs.FSWatcher`.
+   * @since v0.6.8
+   * @param listener
+   */
+  export function watch(
+    filename: PathLike,
+    options:
+      | (WatchOptions & {
+          encoding: "buffer";
+        })
+      | "buffer",
+    listener?: WatchListener<Buffer>,
+  ): FSWatcher;
+  /**
+   * Watch for changes on `filename`, where `filename` is either a file or a directory, returning an `FSWatcher`.
+   * @param filename A path to a file or directory. If a URL is provided, it must use the `file:` protocol.
+   * @param options Either the encoding for the filename provided to the listener, or an object optionally specifying encoding, persistent, and recursive options.
+   * If `encoding` is not supplied, the default of `'utf8'` is used.
+   * If `persistent` is not supplied, the default of `true` is used.
+   * If `recursive` is not supplied, the default of `false` is used.
+   */
+  export function watch(
+    filename: PathLike,
+    options?: WatchOptions | BufferEncoding | null,
+    listener?: WatchListener<string>,
+  ): FSWatcher;
+  /**
+   * Watch for changes on `filename`, where `filename` is either a file or a directory, returning an `FSWatcher`.
+   * @param filename A path to a file or directory. If a URL is provided, it must use the `file:` protocol.
+   * @param options Either the encoding for the filename provided to the listener, or an object optionally specifying encoding, persistent, and recursive options.
+   * If `encoding` is not supplied, the default of `'utf8'` is used.
+   * If `persistent` is not supplied, the default of `true` is used.
+   * If `recursive` is not supplied, the default of `false` is used.
+   */
+  export function watch(
+    filename: PathLike,
+    options: WatchOptions | string,
+    listener?: WatchListener<string | Buffer>,
+  ): FSWatcher;
+  /**
+   * Watch for changes on `filename`, where `filename` is either a file or a directory, returning an `FSWatcher`.
+   * @param filename A path to a file or directory. If a URL is provided, it must use the `file:` protocol.
+   */
+  export function watch(
+    filename: PathLike,
+    listener?: WatchListener<string>,
+  ): FSWatcher;
 }
 
 declare module "node:fs" {
diff --git a/packages/bun-types/globals.d.ts b/packages/bun-types/globals.d.ts
index 5784f91c2..da412b211 100644
--- a/packages/bun-types/globals.d.ts
+++ b/packages/bun-types/globals.d.ts
@@ -1401,34 +1401,33 @@ declare function clearTimeout(id?: number | Timer): void;
 declare function clearImmediate(id?: number | Timer): void;
 // declare function createImageBitmap(image: ImageBitmapSource, options?: ImageBitmapOptions): Promise<ImageBitmap>;
 // declare function createImageBitmap(image: ImageBitmapSource, sx: number, sy: number, sw: number, sh: number, options?: ImageBitmapOptions): Promise<ImageBitmap>;
+
 /**
  * Send a HTTP(s) request
  *
- * @param url URL string
+ * @param request Request object
  * @param init A structured value that contains settings for the fetch() request.
  *
  * @returns A promise that resolves to {@link Response} object.
  *
  *
  */
-
-declare function fetch(
-  url: string | URL | Request,
-  init?: FetchRequestInit,
-): Promise<Response>;
-
+// tslint:disable-next-line:unified-signatures
+declare function fetch(request: Request, init?: RequestInit): Promise<Response>;
 /**
  * Send a HTTP(s) request
  *
- * @param request Request object
+ * @param url URL string
  * @param init A structured value that contains settings for the fetch() request.
  *
  * @returns A promise that resolves to {@link Response} object.
  *
  *
  */
-// tslint:disable-next-line:unified-signatures
-declare function fetch(request: Request, init?: RequestInit): Promise<Response>;
+declare function fetch(
+  url: string | URL | Request,
+  init?: FetchRequestInit,
+): Promise<Response>;
 
 declare function queueMicrotask(callback: (...args: any[]) => void): void;
 /**
@@ -1951,7 +1950,7 @@ interface URLSearchParams {
   ): void;
   /** Returns a string containing a query string suitable for use in a URL. Does not include the question mark. */
   toString(): string;
-  [Symbol.iterator](): IterableIterator<[string, FormDataEntryValue]>;
+  [Symbol.iterator](): IterableIterator<[string, string]>;
 }
 
 declare var URLSearchParams: {
diff --git a/packages/bun-types/http.d.ts b/packages/bun-types/http.d.ts
index 710fea4f4..118cf7ac1 100644
--- a/packages/bun-types/http.d.ts
+++ b/packages/bun-types/http.d.ts
@@ -1785,6 +1785,24 @@ declare module "http" {
     callback?: (res: IncomingMessage) => void,
   ): ClientRequest;
 
+  /**
+   * Performs the low-level validations on the provided name that are done when `res.setHeader(name, value)` is called.
+   * Passing illegal value as name will result in a TypeError being thrown, identified by `code: 'ERR_INVALID_HTTP_TOKEN'`.
+   * @param name Header name
+   * @since v14.3.0
+   */
+  function validateHeaderName(name: string): void;
+  /**
+   * Performs the low-level validations on the provided value that are done when `res.setHeader(name, value)` is called.
+   * Passing illegal value as value will result in a TypeError being thrown.
+   * - Undefined value error is identified by `code: 'ERR_HTTP_INVALID_HEADER_VALUE'`.
+   * - Invalid value character error is identified by `code: 'ERR_INVALID_CHAR'`.
+   * @param name Header name
+   * @param value Header value
+   * @since v14.3.0
+   */
+  function validateHeaderValue(name: string, value: string): void;
+
   let globalAgent: Agent;
 
   /**
diff --git a/packages/bun-types/tests/fs.test-d.ts b/packages/bun-types/tests/fs.test-d.ts
index 1ef14a2f8..3acfafa76 100644
--- a/packages/bun-types/tests/fs.test-d.ts
+++ b/packages/bun-types/tests/fs.test-d.ts
@@ -1,6 +1,15 @@
+import { watch } from "node:fs";
 import * as tsd from "tsd";
 import * as fs from "fs";
 import { exists } from "fs/promises";
 
 tsd.expectType<Promise<boolean>>(exists("/etc/passwd"));
 tsd.expectType<Promise<boolean>>(fs.promises.exists("/etc/passwd"));
+
+// file path
+watch(".", (eventType, filename) => {
+  console.log(`event type = ${eventType}`);
+  if (filename) {
+    console.log(`filename = ${filename}`);
+  }
+});
diff --git a/src/js/builtins/ReadableStreamDefaultReader.ts b/src/js/builtins/ReadableStreamDefaultReader.ts
index 70c6df8c3..a5654d834 100644
--- a/src/js/builtins/ReadableStreamDefaultReader.ts
+++ b/src/js/builtins/ReadableStreamDefaultReader.ts
@@ -75,7 +75,7 @@ export function readMany(this: ReadableStreamDefaultReader): ReadableStreamDefau
   var length = values.length;
 
   if (length > 0) {
-    var outValues = $newArrayWithSize<T>(length);
+    var outValues = $newArrayWithSize(length);
     if ($isReadableByteStreamController(controller)) {
       {
         const buf = values[0];
@@ -150,7 +150,7 @@ export function readMany(this: ReadableStreamDefaultReader): ReadableStreamDefau
 
   var pullResult = controller.$pull(controller);
   if (pullResult && $isPromise(pullResult)) {
-    return pullResult.$then(onPullMany);
+    return pullResult.$then(onPullMany) as any;
   }
 
   return onPullMany(pullResult);
diff --git a/src/js/builtins/ReadableStreamInternals.ts b/src/js/builtins/ReadableStreamInternals.ts
index 0c4e816f4..a9d67aa06 100644
--- a/src/js/builtins/ReadableStreamInternals.ts
+++ b/src/js/builtins/ReadableStreamInternals.ts
@@ -1,3 +1,4 @@
+// @ts-nocheck
 /*
  * Copyright (C) 2015 Canon Inc. All rights reserved.
  * Copyright (C) 2015 Igalia.
diff --git a/src/js/builtins/StreamInternals.ts b/src/js/builtins/StreamInternals.ts
index b42dc2f57..7bb262951 100644
--- a/src/js/builtins/StreamInternals.ts
+++ b/src/js/builtins/StreamInternals.ts
@@ -184,7 +184,7 @@ export function createFIFO() {
       this._capacityMask = (this._capacityMask << 1) | 1;
     }
 
-    shrinkArray() {
+    _shrinkArray() {
       this._list.length >>>= 1;
       this._capacityMask >>>= 1;
     }
diff --git a/src/js/builtins/TransformStream.ts b/src/js/builtins/TransformStream.ts
index 54467db39..2a124d4e1 100644
--- a/src/js/builtins/TransformStream.ts
+++ b/src/js/builtins/TransformStream.ts
@@ -1,3 +1,4 @@
+// @ts-nocheck
 /*
  * Copyright (C) 2020 Apple Inc. All rights reserved.
  *
diff --git a/src/js/builtins/TransformStreamInternals.ts b/src/js/builtins/TransformStreamInternals.ts
index 9994d1282..9da403e71 100644
--- a/src/js/builtins/TransformStreamInternals.ts
+++ b/src/js/builtins/TransformStreamInternals.ts
@@ -1,3 +1,4 @@
+// @ts-nocheck
 /*
  * Copyright (C) 2020 Apple Inc. All rights reserved.
  *
diff --git a/src/js/builtins/WritableStreamDefaultWriter.ts b/src/js/builtins/WritableStreamDefaultWriter.ts
index 795b43892..50b2cd13f 100644
--- a/src/js/builtins/WritableStreamDefaultWriter.ts
+++ b/src/js/builtins/WritableStreamDefaultWriter.ts
@@ -1,3 +1,4 @@
+// @ts-nocheck
 /*
  * Copyright (C) 2020 Apple Inc. All rights reserved.
  *
diff --git a/src/js/builtins/WritableStreamInternals.ts b/src/js/builtins/WritableStreamInternals.ts
index f436a285e..2008dab1c 100644
--- a/src/js/builtins/WritableStreamInternals.ts
+++ b/src/js/builtins/WritableStreamInternals.ts
@@ -610,16 +610,17 @@ export function setUpWritableStreamDefaultControllerFromUnderlyingSink(
   highWaterMark,
   sizeAlgorithm,
 ) {
+  // @ts-ignore
   const controller = new $WritableStreamDefaultController();
 
-  let startAlgorithm = () => {};
-  let writeAlgorithm = () => {
+  let startAlgorithm: (...args: any[]) => any = () => {};
+  let writeAlgorithm: (...args: any[]) => any = () => {
     return Promise.$resolve();
   };
-  let closeAlgorithm = () => {
+  let closeAlgorithm: (...args: any[]) => any = () => {
     return Promise.$resolve();
   };
-  let abortAlgorithm = () => {
+  let abortAlgorithm: (...args: any[]) => any = () => {
     return Promise.$resolve();
   };
 
diff --git a/src/js/builtins/builtins.d.ts b/src/js/builtins/builtins.d.ts
index 2de8d8206..9b32ea45e 100644
--- a/src/js/builtins/builtins.d.ts
+++ b/src/js/builtins/builtins.d.ts
@@ -57,6 +57,9 @@ declare function $getPromiseInternalField<K extends PromiseFieldType, V>(
   promise: Promise<V>,
   key: K,
 ): PromiseFieldToValue<K, V>;
+declare function $fulfillPromise(...args: any[]): TODO;
+declare function $evaluateCommonJSModule(...args: any[]): TODO;
+declare function $loadCJS2ESM(...args: any[]): TODO;
 declare function $getGeneratorInternalField(): TODO;
 declare function $getAsyncGeneratorInternalField(): TODO;
 declare function $getAbstractModuleRecordInternalField(): TODO;
@@ -229,7 +232,7 @@ declare function $createFIFO(): TODO;
 declare function $createNativeReadableStream(): TODO;
 declare function $createReadableStream(): TODO;
 declare function $createUninitializedArrayBuffer(size: number): ArrayBuffer;
-declare function $createWritableStreamFromInternal(): TODO;
+declare function $createWritableStreamFromInternal(...args: any[]): TODO;
 declare function $cwd(): TODO;
 declare function $data(): TODO;
 declare function $dataView(): TODO;
@@ -330,6 +333,7 @@ declare function $read(): TODO;
 declare function $readIntoRequests(): TODO;
 declare function $readRequests(): TODO;
 declare function $readable(): TODO;
+declare function $readableByteStreamControllerGetDesiredSize(...args: any): TODO;
 declare function $readableStreamController(): TODO;
 declare function $readableStreamToArray(): TODO;
 declare function $reader(): TODO;
diff --git a/src/js/bun/ffi.ts b/src/js/bun/ffi.ts
index 7abfe5078..1272e7450 100644
--- a/src/js/bun/ffi.ts
+++ b/src/js/bun/ffi.ts
@@ -239,7 +239,7 @@ ffiWrappers[FFIType.function] = function functionType(val) {
 };
 
 function FFIBuilder(params, returnType, functionToCall, name) {
-  const hasReturnType = typeof FFIType[returnType] === "number" && FFIType[returnType] !== FFIType.void;
+  const hasReturnType = typeof FFIType[returnType] === "number" && FFIType[returnType as string] !== FFIType.void;
   var paramNames = new Array(params.length);
   var args = new Array(params.length);
   for (let i = 0; i < params.length; i++) {
@@ -255,7 +255,7 @@ function FFIBuilder(params, returnType, functionToCall, name) {
 
   var code = `functionToCall(${args.join(", ")})`;
   if (hasReturnType) {
-    if (FFIType[returnType] === FFIType.cstring) {
+    if (FFIType[returnType as string] === FFIType.cstring) {
       code = `return (${cstringReturnType.toString()})(${code})`;
     } else {
       code = `return ${code}`;
@@ -328,7 +328,7 @@ export function dlopen(path, options) {
 
   for (let key in result.symbols) {
     var symbol = result.symbols[key];
-    if (options[key]?.args?.length || FFIType[options[key]?.returns] === FFIType.cstring) {
+    if (options[key]?.args?.length || FFIType[options[key]?.returns as string] === FFIType.cstring) {
       result.symbols[key] = FFIBuilder(
         options[key].args ?? [],
         options[key].returns ?? FFIType.void,
@@ -354,7 +354,7 @@ export function linkSymbols(options) {
 
   for (let key in result.symbols) {
     var symbol = result.symbols[key];
-    if (options[key]?.args?.length || FFIType[options[key]?.returns] === FFIType.cstring) {
+    if (options[key]?.args?.length || FFIType[options[key]?.returns as string] === FFIType.cstring) {
       result.symbols[key] = FFIBuilder(options[key].args ?? [], options[key].returns ?? FFIType.void, symbol, key);
     } else {
       // consistentcy
diff --git a/src/js/node/trace_events.ts b/src/js/node/trace_events.ts
index 789c41222..7edcc57d0 100644
--- a/src/js/node/trace_events.ts
+++ b/src/js/node/trace_events.ts
@@ -13,10 +13,12 @@ function ERR_INVALID_ARG_TYPE(name, type, value) {
 
 function createTracing(opts) {
   if (typeof opts !== "object" || opts == null) {
+    // @ts-ignore
     throw new ERR_INVALID_ARG_TYPE("options", "Object", opts);
   }
 
   // TODO: validate categories
+  // @ts-ignore
   return new Tracing(opts);
 }
 
diff --git a/src/js/private.d.ts b/src/js/private.d.ts
index 500048dd7..d59c6aad8 100644
--- a/src/js/private.d.ts
+++ b/src/js/private.d.ts
@@ -7,9 +7,8 @@
 declare function $bundleError(error: string);
 
 type BunFSWatchOptions = { encoding?: BufferEncoding; persistent?: boolean; recursive?: boolean; signal?: AbortSignal };
-
 type BunWatchEventType = "rename" | "change" | "error" | "close";
-type BunWatchListener<T> = (event: WatchEventType, filename: T | Error | undefined) => void;
+type BunWatchListener<T> = (event: WatchEventType, filename: T | undefined) => void;
 
 interface BunFSWatcher {
   /**
diff --git a/test/bun.lockb b/test/bun.lockb
index c35182d46..01afbfa4e 100755
--- a/test/bun.lockb
+++ b/test/bun.lockb
diff --git a/test/js/node/watch/fs.watch.test.js b/test/js/node/watch/fs.watch.test.ts
index faf6a8546..aa7959bed 100644
--- a/test/js/node/watch/fs.watch.test.js
+++ b/test/js/node/watch/fs.watch.test.ts
@@ -1,4 +1,4 @@
-import fs from "fs";
+import fs, { FSWatcher } from "node:fs";
 import path from "path";
 import { tempDirWithFiles, bunRun, bunRunAsScript } from "harness";
 import { pathToFileURL } from "bun";
@@ -7,7 +7,7 @@ import { describe, expect, test } from "bun:test";
 // Because macOS (and possibly other operating systems) can return a watcher
 // before it is actually watching, we need to repeat the operation to avoid
 // a race condition.
-function repeat(fn) {
+function repeat(fn: any) {
   const interval = setInterval(fn, 20);
   return interval;
 }
@@ -30,7 +30,7 @@ describe("fs.watch", () => {
       // https://github.com/joyent/node/issues/2293 - non-persistent watcher should not block the event loop
       bunRun(path.join(import.meta.dir, "fixtures", "persistent.js"));
       done();
-    } catch (e) {
+    } catch (e: any) {
       done(e);
     }
   });
@@ -39,7 +39,7 @@ describe("fs.watch", () => {
     try {
       bunRun(path.join(import.meta.dir, "fixtures", "close.js"));
       done();
-    } catch (e) {
+    } catch (e: any) {
       done(e);
     }
   });
@@ -48,7 +48,7 @@ describe("fs.watch", () => {
     try {
       bunRun(path.join(import.meta.dir, "fixtures", "unref.js"));
       done();
-    } catch (e) {
+    } catch (e: any) {
       done(e);
     }
   });
@@ -57,7 +57,7 @@ describe("fs.watch", () => {
     try {
       bunRunAsScript(testDir, path.join(import.meta.dir, "fixtures", "relative.js"));
       done();
-    } catch (e) {
+    } catch (e: any) {
       done(e);
     }
   });
@@ -68,7 +68,7 @@ describe("fs.watch", () => {
     try {
       fs.mkdirSync(root);
     } catch {}
-    let err = undefined;
+    let err: Error | undefined = undefined;
     const watcher = fs.watch(root, { signal: AbortSignal.timeout(3000) });
     watcher.on("change", (event, filename) => {
       count++;
@@ -78,7 +78,7 @@ describe("fs.watch", () => {
         if (count >= 2) {
           watcher.close();
         }
-      } catch (e) {
+      } catch (e: any) {
         err = e;
         watcher.close();
       }
@@ -106,9 +106,9 @@ describe("fs.watch", () => {
     const subfolder = path.join(root, "subfolder");
     fs.mkdirSync(subfolder);
     const watcher = fs.watch(root, { recursive: true, signal: AbortSignal.timeout(3000) });
-    let err = undefined;
+    let err: Error | undefined = undefined;
     watcher.on("change", (event, filename) => {
-      const basename = path.basename(filename);
+      const basename = path.basename(filename as string);
 
       if (basename === "subfolder") return;
       count++;
@@ -118,7 +118,7 @@ describe("fs.watch", () => {
         if (count >= 2) {
           watcher.close();
         }
-      } catch (e) {
+      } catch (e: any) {
         err = e;
         watcher.close();
       }
@@ -141,12 +141,12 @@ describe("fs.watch", () => {
       "deleted.txt": "hello",
     });
     const filepath = path.join(testsubdir, "deleted.txt");
-    let err = undefined;
+    let err: Error | undefined = undefined;
     const watcher = fs.watch(testsubdir, function (event, filename) {
       try {
         expect(event).toBe("rename");
         expect(filename).toBe("deleted.txt");
-      } catch (e) {
+      } catch (e: any) {
         err = e;
       } finally {
         clearInterval(interval);
@@ -169,12 +169,12 @@ describe("fs.watch", () => {
     const filepath = path.join(testDir, "watch.txt");
 
     const watcher = fs.watch(filepath);
-    let err = undefined;
+    let err: Error | undefined = undefined;
     watcher.on("change", function (event, filename) {
       try {
         expect(event).toBe("change");
         expect(filename).toBe("watch.txt");
-      } catch (e) {
+      } catch (e: any) {
         err = e;
       } finally {
         clearInterval(interval);
@@ -195,7 +195,7 @@ describe("fs.watch", () => {
     try {
       fs.watch(path.join(testDir, "404.txt"));
       done(new Error("should not reach here"));
-    } catch (err) {
+    } catch (err: any) {
       expect(err).toBeInstanceOf(Error);
       expect(err.code).toBe("ENOENT");
       expect(err.syscall).toBe("watch");
@@ -203,13 +203,13 @@ describe("fs.watch", () => {
     }
   });
 
-  const encodings = ["utf8", "buffer", "hex", "ascii", "base64", "utf16le", "ucs2", "latin1", "binary"];
+  const encodings = ["utf8", "buffer", "hex", "ascii", "base64", "utf16le", "ucs2", "latin1", "binary"] as const;
 
   test(`should work with encodings ${encodings.join(", ")}`, async () => {
-    const watchers = [];
+    const watchers: FSWatcher[] = [];
     const filepath = path.join(testDir, encodingFileName);
 
-    const promises = [];
+    const promises: Promise<any>[] = [];
     encodings.forEach(name => {
       const encoded_filename =
         name !== "buffer" ? Buffer.from(encodingFileName, "utf8").toString(name) : Buffer.from(encodingFileName);
@@ -225,11 +225,11 @@ describe("fs.watch", () => {
                   expect(filename).toBe(encoded_filename);
                 } else {
                   expect(filename).toBeInstanceOf(Buffer);
-                  expect(filename.toString("utf8")).toBe(encodingFileName);
+                  expect((filename as any as Buffer)!.toString("utf8")).toBe(encodingFileName);
                 }
 
-                resolve();
-              } catch (e) {
+                resolve(undefined);
+              } catch (e: any) {
                 reject(e);
               }
             }),
@@ -254,12 +254,12 @@ describe("fs.watch", () => {
     const filepath = path.join(testDir, "url.txt");
     try {
       const watcher = fs.watch(pathToFileURL(filepath));
-      let err = undefined;
+      let err: Error | undefined = undefined;
       watcher.on("change", function (event, filename) {
         try {
           expect(event).toBe("change");
           expect(filename).toBe("url.txt");
-        } catch (e) {
+        } catch (e: any) {
           err = e;
         } finally {
           clearInterval(interval);
@@ -274,7 +274,7 @@ describe("fs.watch", () => {
       const interval = repeat(() => {
         fs.writeFileSync(filepath, "world");
       });
-    } catch (e) {
+    } catch (e: any) {
       done(e);
     }
   });
@@ -288,12 +288,12 @@ describe("fs.watch", () => {
         try {
           watcher.close();
           done();
-        } catch (e) {
+        } catch (e: any) {
           done("Should not error when calling close from error event");
         }
       });
       ac.abort();
-    } catch (e) {
+    } catch (e: any) {
       done(e);
     }
   });
@@ -308,13 +308,13 @@ describe("fs.watch", () => {
         try {
           watcher.close();
           done();
-        } catch (e) {
+        } catch (e: any) {
           done("Should not error when calling close from close event");
         }
       });
 
       ac.abort();
-    } catch (e) {
+    } catch (e: any) {
       done(e);
     }
   });
@@ -325,7 +325,7 @@ describe("fs.watch", () => {
     const ac = new AbortController();
     const promise = new Promise((resolve, reject) => {
       const watcher = fs.watch(filepath, { signal: ac.signal });
-      watcher.once("error", err => (err.message === "The operation was aborted." ? resolve() : reject(err)));
+      watcher.once("error", err => (err.message === "The operation was aborted." ? resolve(undefined) : reject(err)));
       watcher.once("close", () => reject());
     });
     await Bun.sleep(10);
@@ -339,7 +339,7 @@ describe("fs.watch", () => {
     const signal = AbortSignal.abort();
     await new Promise((resolve, reject) => {
       const watcher = fs.watch(filepath, { signal });
-      watcher.once("error", err => (err.message === "The operation was aborted." ? resolve() : reject(err)));
+      watcher.once("error", err => (err.message === "The operation was aborted." ? resolve(undefined) : reject(err)));
       watcher.once("close", () => reject());
     });
   });
@@ -353,13 +353,13 @@ describe("fs.watch", () => {
     });
 
     const promise = new Promise((resolve, reject) => {
-      let timeout = null;
+      let timeout: any = null;
       const watcher = fs.watch(filepath, event => {
         clearTimeout(timeout);
         clearInterval(interval);
         try {
           resolve(event);
-        } catch (e) {
+        } catch (e: any) {
           reject(e);
         } finally {
           watcher.close();
@@ -383,7 +383,7 @@ describe("fs.promises.watch", () => {
       fs.mkdirSync(root);
     } catch {}
     let success = false;
-    let err = undefined;
+    let err: Error | undefined = undefined;
     try {
       const ac = new AbortController();
       const watcher = fs.promises.watch(root, { signal: ac.signal });
@@ -405,13 +405,13 @@ describe("fs.promises.watch", () => {
             clearInterval(interval);
             ac.abort();
           }
-        } catch (e) {
+        } catch (e: any) {
           err = e;
           clearInterval(interval);
           ac.abort();
         }
       }
-    } catch (e) {
+    } catch (e: any) {
       if (!success) {
         throw err || e;
       }
@@ -427,7 +427,7 @@ describe("fs.promises.watch", () => {
     const subfolder = path.join(root, "subfolder");
     fs.mkdirSync(subfolder);
     let success = false;
-    let err = undefined;
+    let err: Error | undefined = undefined;
 
     try {
       const ac = new AbortController();
@@ -439,7 +439,7 @@ describe("fs.promises.watch", () => {
         fs.rmdirSync(path.join(subfolder, "new-folder.txt"));
       });
       for await (const event of watcher) {
-        const basename = path.basename(event.filename);
+        const basename = path.basename(event.filename!);
         if (basename === "subfolder") continue;
 
         count++;
@@ -452,13 +452,13 @@ describe("fs.promises.watch", () => {
             clearInterval(interval);
             ac.abort();
           }
-        } catch (e) {
+        } catch (e: any) {
           err = e;
           clearInterval(interval);
           ac.abort();
         }
       }
-    } catch (e) {
+    } catch (e: any) {
       if (!success) {
         throw err || e;
       }
@@ -474,7 +474,7 @@ describe("fs.promises.watch", () => {
     const promise = (async () => {
       try {
         for await (const _ of watcher);
-      } catch (e) {
+      } catch (e: any) {
         expect(e.message).toBe("The operation was aborted.");
       }
     })();
@@ -491,7 +491,7 @@ describe("fs.promises.watch", () => {
     await (async () => {
       try {
         for await (const _ of watcher);
-      } catch (e) {
+      } catch (e: any) {
         expect(e.message).toBe("The operation was aborted.");
       }
     })();
@@ -511,7 +511,7 @@ describe("fs.promises.watch", () => {
         for await (const event of watcher) {
           return event.eventType;
         }
-      } catch (e) {
+      } catch (e: any) {
         expect("unreacheable").toBe(false);
       } finally {
         clearInterval(interval);
diff --git a/test/js/third_party/socket.io/support/util.ts b/test/js/third_party/socket.io/support/util.ts
index 597b40d65..b5f515568 100644
--- a/test/js/third_party/socket.io/support/util.ts
+++ b/test/js/third_party/socket.io/support/util.ts
@@ -1,3 +1,4 @@
+// @ts-nocheck
 import type { Server } from "socket.io";
 import request from "supertest";
 
diff --git a/test/js/web/html/FormData.test.ts b/test/js/web/html/FormData.test.ts
index cbaf5aaa7..45b4f2f5a 100644
--- a/test/js/web/html/FormData.test.ts
+++ b/test/js/web/html/FormData.test.ts
@@ -301,17 +301,18 @@ describe("FormData", () => {
     expect(await (body.get("foo") as Blob).text()).toBe("baz");
     server.stop(true);
   });
-
+  type FetchReqArgs = [request: Request, init?: RequestInit];
+  type FetchURLArgs = [url: string | URL | Request, init?: FetchRequestInit];
   for (let useRequestConstructor of [true, false]) {
     describe(useRequestConstructor ? "Request constructor" : "fetch()", () => {
-      function send(args: Parameters<typeof fetch>) {
+      function send(args: FetchReqArgs | FetchURLArgs) {
         if (useRequestConstructor) {
-          return fetch(new Request(...args));
+          return fetch(new Request(...(args as FetchReqArgs)));
         } else {
-          return fetch(...args);
+          return fetch(...(args as FetchURLArgs));
         }
       }
-      for (let headers of [{}, undefined, { headers: { X: "Y" } }]) {
+      for (let headers of [{} as {}, undefined, { headers: { X: "Y" } }]) {
         describe("headers: " + Bun.inspect(headers).replaceAll(/([\n ])/gim, ""), () => {
           it("send on HTTP server with FormData & Blob (roundtrip)", async () => {
             let contentType = "";
@@ -330,11 +331,10 @@ describe("FormData", () => {
             form.append("bar", "baz");
 
             // @ts-ignore
-            const reqBody = [
+            const reqBody: FetchURLArgs = [
               `http://${server.hostname}:${server.port}`,
               {
                 body: form,
-
                 headers,
                 method: "POST",
               },
@@ -364,7 +364,6 @@ describe("FormData", () => {
             form.append("foo", file);
             form.append("bar", "baz");
 
-            // @ts-ignore
             const reqBody = [
               `http://${server.hostname}:${server.port}`,
               {
@@ -374,7 +373,7 @@ describe("FormData", () => {
                 method: "POST",
               },
             ];
-            const res = await send(reqBody);
+            const res = await send(reqBody as FetchURLArgs);
             const body = await res.formData();
             expect(await (body.get("foo") as Blob).text()).toBe(text);
             expect(contentType).toContain("multipart/form-data");
@@ -410,7 +409,7 @@ describe("FormData", () => {
                 method: "POST",
               },
             ];
-            const res = await send(reqBody);
+            const res = await send(reqBody as FetchURLArgs);
             const body = await res.formData();
             expect(contentType).toContain("multipart/form-data");
             expect(body.get("foo")).toBe("boop");
diff --git a/test/js/web/html/URLSearchParams.test.ts b/test/js/web/html/URLSearchParams.test.ts
index 120bb2321..41c42c25d 100644
--- a/test/js/web/html/URLSearchParams.test.ts
+++ b/test/js/web/html/URLSearchParams.test.ts
@@ -7,15 +7,20 @@ describe("URLSearchParams", () => {
       params.append("foo", "bar");
       params.append("foo", "boop");
       params.append("bar", "baz");
+      // @ts-ignore
       expect(params.length).toBe(3);
       params.delete("foo");
+      // @ts-ignore
       expect(params.length).toBe(1);
       params.append("foo", "bar");
+      // @ts-ignore
       expect(params.length).toBe(2);
       params.delete("foo");
       params.delete("foo");
+      // @ts-ignore
       expect(params.length).toBe(1);
       params.delete("bar");
+      // @ts-ignore
       expect(params.length).toBe(0);
     });
 
diff --git a/test/package.json b/test/package.json
index 5529d3f20..75f8d35e3 100644
--- a/test/package.json
+++ b/test/package.json
@@ -8,6 +8,7 @@
     "@swc/core": "1.3.38",
     "@types/react": "18.0.28",
     "@types/react-dom": "18.0.11",
+    "@types/supertest": "2.0.12",
     "bktree-fast": "0.0.7",
     "body-parser": "1.20.2",
     "dedent": "0.7.0",
@@ -17,6 +18,9 @@
     "jest-extended": "4.0.0",
     "lodash": "4.17.21",
     "nodemailer": "6.9.3",
+    "pg": "8.11.1",
+    "pg-connection-string": "2.6.1",
+    "postgres": "3.3.5",
     "prisma": "4.15.0",
     "socket.io": "4.7.1",
     "socket.io-client": "4.7.1",
@@ -26,10 +30,7 @@
     "undici": "5.20.0",
     "vitest": "0.32.2",
     "webpack": "5.88.0",
-    "webpack-cli": "4.7.2",
-    "pg": "8.11.1", 
-    "postgres": "3.3.5",
-    "pg-connection-string": "2.6.1"
+    "webpack-cli": "4.7.2"
   },
   "private": true,
   "scripts": {
diff --git a/test/tsconfig.json b/test/tsconfig.json
index 67f706cdf..a5e77bf59 100644
--- a/test/tsconfig.json
+++ b/test/tsconfig.json
@@ -1,13 +1,8 @@
 {
-  "include": [
-    ".",
-    "../packages/bun-types/index.d.ts"
-  ],
+  "include": [".", "../packages/bun-types/index.d.ts"],
   "compilerOptions": {
     "noEmit": true,
-    "lib": [
-      "ESNext"
-    ],
+    "lib": ["ESNext"],
     "module": "ESNext",
     "target": "ESNext",
     "moduleResolution": "bundler",
@@ -23,25 +18,14 @@
     "resolveJsonModule": true,
     "baseUrl": ".",
     "paths": {
-      "harness": [
-        "harness.ts"
-      ],
-      "mkfifo": [
-        "mkfifo.ts"
-      ],
-      "node-harness": [
-        "js/node/harness.ts"
-      ],
-      "deno:harness": [
-        "js/deno/harness.ts"
-      ],
-      "foo/bar": [
-        "js/bun/resolve/baz.js"
-      ],
-      "@faasjs/*": [
-        "js/bun/resolve/*.js"
-      ]
+      "harness": ["harness.ts"],
+      "mkfifo": ["mkfifo.ts"],
+      "node-harness": ["js/node/harness.ts"],
+      "deno:harness": ["js/deno/harness.ts"],
+      "foo/bar": ["js/bun/resolve/baz.js"],
+      "@faasjs/*": ["js/bun/resolve/*.js"]
     }
   },
+
   "exclude": ["bundler/fixtures", "snapshots", "js/deno"]
 }
diff --git a/tsconfig.json b/tsconfig.json
index 0ee640ea0..d8be0da03 100644
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -6,12 +6,10 @@
     // "skipLibCheck": true,
     "allowJs": true
   },
-  "include": [
-    ".",
-    "packages/bun-types/index.d.ts"
-  ],
+  "include": [".", "packages/bun-types/index.d.ts"],
   "exclude": [
     "src/test",
+    // "src/js/builtins",
     "packages",
     "bench",
     "examples/*/*",
@@ -21,5 +19,6 @@
     "src/bun.js/WebKit",
     "src/api/demo",
     "node_modules"
-  ]
+  ],
+  "files": ["src/js/builtins/builtins.d.ts"]
 }