### What does this PR do?
- removes the `Unimplemented in Bun` comment on `CompressionStream` and
`DecompressionStream`
- updates the types for `CompressionStream` and `DecompressionStream` to
add a new internal `CompressionFormat` type to the constructor, which
adds `brotli` and `zstd` to the union
- adds tests for brotli and zstd usage
- adds lib.dom.d.ts exclusions for brotli and zstd as these don't exist
in the DOM version of CompressionFormat
fixes#25367
### How did you verify your code works?
typechecks and tests
## Summary
- When a URL object is passed as the proxy option, or when a proxy
object lacks a "url" property, ignore it instead of throwing an error
- This fixes a regression introduced in 1.3.4 where libraries like taze
that pass URL objects as proxy values would fail
## Test plan
- Added test: "proxy as URL object should be ignored (no url property)"
- passes a URL object directly as proxy
- Updated test: "proxy object without url is ignored (regression
#25413)" - proxy object with headers but no url
- Updated test: "proxy object with null url is ignored (regression
#25413)" - proxy object where url is null
- All 29 proxy tests pass
Fixes#25413🤖 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: Jarred Sumner <jarred@jarredsumner.com>
### What does this PR do?
- Add `contentDisposition` option to S3 file uploads to control the
`Content-Disposition` HTTP header
- Support passing `contentDisposition` through all S3 upload paths
(simple uploads, multipart uploads, and streaming uploads)
- Add TypeScript types for the new option
Fixes https://github.com/oven-sh/bun/issues/25362
### How did you verify your code works?
Test
## Summary
- Expanded documentation for embedding files in single-file executables
with `with { type: "file" }`
- Added clear explanation of how the import attribute works and path
transformation at build time
- Added examples for reading embedded files with both `Bun.file()` and
Node.js `fs` APIs
- Added practical examples: JSON configs, HTTP static assets, templates,
binary files (WASM, fonts)
- Improved `Bun.embeddedFiles` section with a dynamic asset server
example
## Test plan
- [x] Verified all code examples compile and run correctly with `bun
build --compile`
- [x] Tested `Bun.file()` reads embedded files correctly
- [x] Tested `node:fs` APIs (`readFileSync`, `promises.readFile`,
`stat`) work with embedded files
- [x] Tested `Bun.embeddedFiles` returns correct blob array
- [x] Tested `--asset-naming` flag removes content hashes
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Fixes#25398
### What does this PR do?
Fixes a bug where object expressions with spread properties and nullish
coalescing to empty objects (e.g., `k?.x ?? {}`) would produce invalid
JavaScript output like `k?.x ?? ` (missing `{}`).
### Root Cause
In `src/ast/SideEffects.zig`, the `simplifyUnusedExpr` function handles
unused object expressions with spread properties. When simplifying
property values:
1. The code creates a mutable copy `prop` from the original `prop_`
2. When a property value is simplified (e.g., `k?.x ?? {}` → `k?.x`), it
updates `prop.value`
3. **Bug:** The code then wrote back `prop_` (the original) instead of
`prop` (the modified copy)
Because `simplifyUnusedExpr` mutates the AST in place when handling
nullish coalescing (setting `bin.right` to empty), the original `prop_`
now contained an expression with `bin.right` as an empty/missing
expression, resulting in invalid output.
### How did you verify your code works?
- Added regression test in `test/regression/issue/25398.test.ts`
- Verified the original reproduction case passes
- Verified existing CommonJS tests continue to pass
- Verified test fails with system bun and passes with the fix
## Summary
- Document new default behavior in v1.3.4: `tsconfig.json` and
`package.json` loading is now disabled by default for standalone
executables
- Add documentation for `--compile-autoload-tsconfig` and
`--compile-autoload-package-json` CLI flags
- Document all four JavaScript API options: `autoloadTsconfig`,
`autoloadPackageJson`, `autoloadDotenv`, `autoloadBunfig`
- Note that `.env` and `bunfig.toml` may also be disabled by default in
a future version
## Test plan
- [ ] Review rendered documentation for accuracy and formatting
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## Summary
- Fix `mock.mock.args` to `mock.mock.calls` in mock-functions.mdx (the
`.args` property doesn't exist)
- Fix mock.restore example to use module methods instead of spy
functions (calling spy functions after restore returns `undefined`)
- Add missing `vi` import in Vitest compatibility example
## Test plan
- [x] Verified each code block works by running tests against the debug
build
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## Summary
- Change the size header in embedded Mach-O and PE sections from `u32`
(4 bytes) to `u64` (8 bytes)
- Ensures the data payload starts at an 8-byte aligned offset, which is
required for the bytecode cache
## Test plan
- [x] Test standalone compilation on macOS
- [ ] Test standalone compilation on Windows
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---------
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## Summary
- Fix `napi_typeof` to return `napi_object` for boxed String objects
(`new String("hello")`) instead of incorrectly returning `napi_string`
- Add regression test for boxed primitive objects (String, Number,
Boolean)
The issue was that `StringObjectType` and `DerivedStringObjectType` JSC
cell types were falling through to return `napi_string`, but these
represent object wrappers around strings, not primitive strings.
## Test plan
- [x] `bun bd test test/napi/napi.test.ts -t "napi_typeof"` passes
- [x] Test fails with `USE_SYSTEM_BUN=1` (confirming the bug exists in
released version)
Fixes#25351🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude Bot <claude-bot@bun.sh>
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This reverts commit b4c8379447.
### What does this PR do?
### How did you verify your code works?
---------
Co-authored-by: Claude Bot <claude-bot@bun.sh>
Co-authored-by: Claude <noreply@anthropic.com>
## Summary
By default, standalone executables no longer load `tsconfig.json` and
`package.json` at runtime. This improves startup performance and
prevents unexpected behavior from config files in the runtime
environment.
- Added `--compile-autoload-tsconfig` / `--no-compile-autoload-tsconfig`
CLI flags (default: false)
- Added `--compile-autoload-package-json` /
`--no-compile-autoload-package-json` CLI flags (default: false)
- Added `autoloadTsconfig` and `autoloadPackageJson` options to the
`Bun.build()` compile config
- Flags are stored in `StandaloneModuleGraph.Flags` and applied at
runtime boot
This follows the same pattern as the existing
`--compile-autoload-dotenv` and `--compile-autoload-bunfig` flags.
## Test plan
- [x] Added tests in `test/bundler/bundler_compile_autoload.test.ts`
- [x] Verified standalone executables work correctly with runtime config
files that differ from compile-time configs
- [x] Verified the new CLI flags are properly parsed and applied
- [x] Verified the JS API options work correctly
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Fixes ENG-21288
TODO: Test with `@testing-library/react` `waitFor`
---------
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This fixes a critical bug where `http.Agent` with `keepAlive: true` was
not reusing connections, causing a 66% performance degradation compared
to Node.js. Every request was establishing a new TCP/TLS connection
instead of reusing existing ones.
**Root Cause:**
Three independent bugs were causing the connection pool to fail:
1. **TypeScript layer** (`src/js/node/_http_client.ts:271`)
- Reading wrong property: `keepalive` instead of `keepAlive`
- User's `keepAlive: true` setting was being ignored
2. **Request header handling** (`src/http.zig:591`)
- Only handled `Connection: close`, ignored `Connection: keep-alive`
- Missing explicit flag update for keep-alive header
3. **Response header handling** (`src/http.zig:2240`)
- Used compile-time function `eqlComptime` at runtime (always failed)
- Inverted logic: disabled pool when NOT "keep-alive"
- Ignored case-sensitivity (should use `eqlIgnoreCase` per RFC 7230)
**Performance Impact:**
- **Before**: All requests ~940ms, stddev 33ms (0% improvement) ❌
- **After**: First request ~930ms, subsequent ~320ms (65.9% improvement)
✅
- Performance now matches Node.js (65.9% vs 66.5% improvement)
- QPS increased from 4.2 to 12.2 req/s (190% improvement)
**Files Changed:**
- `src/js/node/_http_client.ts` - Fix property name (1 line)
- `src/http.zig` - Fix request/response header handling (5 lines)
Fixes#12053
### What does this PR do?
This PR fixes the HTTP connection pool by correcting three bugs:
1. **Fixes TypeScript property name**: Changes `this[kAgent]?.keepalive`
to `this[kAgent]?.keepAlive` to properly read the user's keepAlive
setting from http.Agent
2. **Adds keep-alive request header handling**: Explicitly sets
`disable_keepalive = false` when receiving `Connection: keep-alive`
header
3. **Fixes response header parsing**:
- Replaces compile-time `strings.eqlComptime()` with runtime
`std.ascii.eqlIgnoreCase()`
- Corrects inverted logic to properly enable connection pool on
`Connection: keep-alive`
- Makes header comparison case-insensitive per RFC 7230
All three bugs must be fixed together - any single bug would cause the
connection pool to fail.
### How did you verify your code works?
**Test 1: Minimal reproduction with 10 sequential HTTPS requests**
```typescript
const agent = new https.Agent({ keepAlive: true });
// Make 10 requests to https://api.example.com
```
Results:
- First request: 930ms (cold start with TCP/TLS handshake)
- Subsequent requests: ~320ms average (connection reused)
- **Improvement: 65.9%** (matches Node.js 66.5%)
- Verified across 3 repeated test runs for stability
**Test 2: Response header validation**
- Confirmed server returns `Connection: Keep-Alive`
- Verified Bun correctly parses and applies the header
**Test 3: Performance comparison**
| Runtime | First Request | Subsequent Avg | Improvement | QPS |
|---------|--------------|----------------|-------------|-----|
| Node.js v20.18.0 | 938ms | 314ms | **66.5%** | 12.2 |
| Bun v1.3.1 (broken) | 935ms | 942ms | -0.7% ❌ | 4.2 |
| Bun v1.3.2 (fixed) | 930ms | 317ms | **65.9%** ✅ | 12.2 |
Bun now performs identically to Node.js, confirming the connection pool
works correctly.
## Summary
- Fix regression where `new Bun.FFI.CString(ptr)` throws "function is
not a constructor"
- Pass the same function as both call and constructor callbacks for
CString
## Root Cause
PR #24910 replaced `jsc.createCallback` with `jsc.JSFunction.create` for
all FFI functions. However, `JSFunction.create` doesn't allow
constructor calls by default (it uses `callHostFunctionAsConstructor`
which throws). The old `createCallback` used `JSFFIFunction` which
allowed the same function to be called with `new`.
## Fix
Pass the same function as both the `implementation` and `constructor`
option to `JSFunction.create` for CString specifically. This allows `new
CString(ptr)` to work while keeping the refactoring from #24910.
Additionally, the `bun:ffi` module now replaces `Bun.FFI.CString` with
the proper JS CString class after loading, so users get the full class
with `.ptr`, `.byteOffset`, etc. properties.
## Test plan
- [x] Added regression test `test/regression/issue/25231.test.ts`
- [x] Test fails with `USE_SYSTEM_BUN=1` (v1.3.3), passes with fix
- [x] Verified reproduction case from issue works
Fixes#25231🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude Bot <claude-bot@bun.sh>
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This PR addresses several issues opened for the docs:
- Add callout for SQLite caching behavior between prepare() and query()
- Fix SQLite types and fix deprecated exec to run
- Fix Secrets API example
- Update SolidStart guide
- Add bun upgrade guide
- Prefer `process.versions.bun` over `typeof Bun` for detection
- Document complete `bunx` flags
- Improve Nitro preset documentation for Nuxt
Fixes#23165, #24424, #24294, #25175, #18433, #16804, #22967, #22527,
#10560, #14744
## Summary
- Added null check for `sourceOrigin` before accessing its URL in
`jest.mock()`
- When `callerSourceOrigin()` returns null (e.g., when called with
invalid arguments), the code now safely returns early instead of
crashing
## Test plan
- [x] Added regression test `test/regression/issue/ENG-24434.test.ts`
- [x] `bun bd test test/regression/issue/ENG-24434.test.ts` passes
Fixes ENG-24434
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## Summary
- Fix typo where `GetConsoleOutputCP()` was called twice instead of
calling `GetConsoleCP()` for the input codepage
- Add missing `GetConsoleCP()` extern declaration in windows.zig
The code was saving the output codepage twice, meaning the input
codepage was never properly saved and thus couldn't be correctly
restored.
## Note
This fix corrects a bug in the codepage save/restore logic, but **may
not fully resolve the garbled text issue** in #25151. The garbled text
problem occurs when `bunx` (without `--bun`) runs a package via Node.js,
and that package tries to spawn `bun`. The error message from cmd.exe
gets garbled on non-English Windows systems.
Further investigation may be needed to determine if additional codepage
handling is required when spawning processes.
Related to #25151🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-authored-by: Claude <claude-bot@bun.sh>
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Co-authored-by: Jarred Sumner <jarred@jarredsumner.com>
## Summary
Fixes `TLSSocket.isSessionReused()` to use BoringSSL's
`SSL_session_reused()` API instead of incorrectly checking if a session
was set.
The previous implementation returned `!!this[ksession]` which would
return `true` if `setSession()` was called, even if the session wasn't
actually reused by the SSL layer. This fix correctly uses the native SSL
API like Node.js does.
## Changes
- Added native `isSessionReused` function in Zig that calls
`SSL_session_reused()`
- Updated `TLSSocket.prototype.isSessionReused` to use the native
implementation
- Added regression tests
## Test plan
- [x] `bun bd test test/regression/issue/25190.test.ts` passes
- [x] `bun bd test test/js/node/tls/node-tls-connect.test.ts` passes
Fixes#25190🤖 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>
## Summary
- Fixes `assert.deepStrictEqual()` to properly compare Number and
Boolean wrapper objects
- Previously, `new Number(1)` and `new Number(2)` were incorrectly
considered equal because they have no enumerable properties
- Now correctly extracts and compares internal values using
`JSC::sameValue()`, then falls through to check own properties
## Test plan
- [x] Run `bun bd test test/regression/issue/24045.test.ts` - all 6
tests pass
- [x] Verify tests fail with system Bun (`USE_SYSTEM_BUN=1`) to confirm
fix validity
- [x] Verified behavior matches Node.js exactly (see table below)
## Node.js Compatibility
| Test Case | Node.js | Bun |
|-----------|---------|-----|
| Different Number values (`new Number(1)` vs `new Number(2)`) | throws
| throws |
| Same Number values (`new Number(1)` vs `new Number(1)`) | equal |
equal |
| 0 vs -0 (`new Number(0)` vs `new Number(-0)`) | throws | throws |
| NaN equals NaN (`new Number(NaN)` vs `new Number(NaN)`) | equal |
equal |
| Different Boolean values (`new Boolean(true)` vs `new Boolean(false)`)
| throws | throws |
| Same Boolean values | equal | equal |
| Number wrapper vs primitive (`new Number(1)` vs `1`) | throws | throws
|
| Number vs Boolean wrapper | throws | throws |
| Same value, different own properties | throws | throws |
| Same value, same own properties | equal | equal |
| Different own property values | throws | throws |
## Example
Before (bug):
```javascript
assert.deepStrictEqual(new Number(1), new Number(2)); // passes incorrectly
```
After (fixed):
```javascript
assert.deepStrictEqual(new Number(1), new Number(2)); // throws AssertionError
```
Closes#24045🤖 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: Jarred Sumner <jarred@jarredsumner.com>
### What does this PR do?
Ensures `ptr` is either a number or heap big int before converting to a
number.
also fixes ENG-24039
### How did you verify your code works?
Added a test
### What does this PR do?
Fixes checking for exceptions when creating empty or used readable
streams
also fixes ENG-24038
### How did you verify your code works?
Added a test for creating empty streams
## Summary
- Implements the `%j` format specifier for `console.log` and related
console methods
- `%j` outputs the JSON stringified representation of the value
- Previously, `%j` was not recognized and was left as literal text in
the output
## Test plan
- [x] Run `bun bd test test/regression/issue/24234.test.ts` - all 5
tests pass
- [x] Verify tests fail with system Bun (`USE_SYSTEM_BUN=1`) to confirm
fix validity
- [x] Manual verification: `console.log('%j', {foo: 'bar'})` outputs
`{"foo":"bar"}`
## Example
Before (bug):
```
$ bun -e "console.log('%j %s', {foo: 'bar'}, 'hello')"
%j [object Object] hello
```
After (fixed):
```
$ bun -e "console.log('%j %s', {foo: 'bar'}, 'hello')"
{"foo":"bar"} hello
```
Closes#24234🤖 Generated with [Claude Code](https://claude.com/claude-code)
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## Summary
- Add proper bounds checking for encoding operations that produce larger
output than input
- Handle allocation failures gracefully by returning appropriate errors
- Add defensive checks in string initialization functions
## Test plan
- Added test case for encoding operations with large buffers
- Verified existing buffer tests still pass
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## Summary
Implements the [URLPattern Web
API](https://developer.mozilla.org/en-US/docs/Web/API/URLPattern) based
on WebKit's implementation. URLPattern provides declarative pattern
matching for URLs, similar to how regular expressions work for strings.
### Features
- **Constructor**: Create patterns from strings or `URLPatternInit`
dictionaries
- **`test()`**: Check if a URL matches the pattern (returns boolean)
- **`exec()`**: Extract matched groups from a URL (returns
`URLPatternResult` or null)
- **Pattern properties**: `protocol`, `username`, `password`,
`hostname`, `port`, `pathname`, `search`, `hash`
- **`hasRegExpGroups`**: Detect if the pattern uses custom regular
expressions
### Example Usage
```js
// Match URLs with a user ID parameter
const pattern = new URLPattern({ pathname: '/users/:id' });
pattern.test('https://example.com/users/123'); // true
pattern.test('https://example.com/posts/456'); // false
const result = pattern.exec('https://example.com/users/123');
console.log(result.pathname.groups.id); // "123"
// Wildcard matching
const filesPattern = new URLPattern({ pathname: '/files/*' });
const match = filesPattern.exec('https://example.com/files/image.png');
console.log(match.pathname.groups[0]); // "image.png"
```
## Implementation Notes
- Adapted from WebKit's URLPattern implementation
- Modified JS bindings to work with Bun's infrastructure (simpler
`convertDictionary` patterns, WTF::Variant handling)
- Added IsoSubspaces for proper GC integration
## Test Plan
- [x] 408 tests from Web Platform Tests pass
- [x] Tests fail with system Bun (URLPattern not defined), pass with
debug build
- [x] Manual testing of basic functionality
Fixes https://github.com/oven-sh/bun/issues/2286🤖 Generated with [Claude Code](https://claude.com/claude-code)
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