### What does this PR do?
Currently bundling and running projects with cyclic async module
dependencies will hang due to module promises never resolving. This PR
unblocks these projects by outputting `await Promise.all` with these
dependencies.
Before (will hang with bun, or error with unsettled top level await with
node):
```js
var __esm = (fn, res) => () => (fn && (res = fn((fn = 0))), res);
var init_mod3 = __esm(async () => {
await init_mod1();
});
var init_mod2 = __esm(async () => {
await init_mod1();
});
var init_mod1 = __esm(async () => {
await init_mod2();
await init_mod3();
});
await init_mod1();
```
After:
```js
var __esm = (fn, res) => () => (fn && (res = fn((fn = 0))), res);
var __promiseAll = Promise.all.bind(Promise);
var init_mod3 = __esm(async () => {
await init_mod1();
});
var init_mod2 = __esm(async () => {
await init_mod1();
});
var init_mod1 = __esm(async () => {
await __promiseAll([init_mod2(), init_mod3()]);
});
await init_mod1();
```
### How did you verify your code works?
Manually and tests
---------
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: Jarred Sumner <jarred@jarredsumner.com>
## Summary
- Removes unused function and class expression names when
`--minify-syntax` is enabled during bundling
- Adds `--keep-names` flag to preserve original names when minifying
- Matches esbuild's minification behavior
## Problem
When minifying with `--minify-syntax`, Bun was keeping function and
class expression names even when they were never referenced, resulting
in larger bundle sizes compared to esbuild.
**Before:**
```js
export var AB = function A() { };
// Bun output: var AB = function A() {};
// esbuild output: var AB = function() {};
```
## Solution
This PR adds logic to remove unused function and class expression names
during minification, matching esbuild's behavior. Names are only removed
when:
- `--minify-syntax` is enabled
- Bundling is enabled (not transform-only mode)
- The scope doesn't contain direct eval (which could reference the name
dynamically)
- The symbol's usage count is 0
Additionally, a `--keep-names` flag has been added to preserve original
names when desired (useful for debugging or runtime reflection).
## Testing
- Updated existing test in `bundler_minify.test.ts`
- All transpiler tests pass
- Manually verified output matches esbuild for various cases
## Examples
```bash
# Without --keep-names (names removed)
bun build --minify-syntax input.js
# var AB = function() {}
# With --keep-names (names preserved)
bun build --minify-syntax --keep-names input.js
# var AB = function A() {}
```
🤖 Generated with [Claude Code](https://claude.ai/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>
Co-authored-by: Dylan Conway <dylan.conway567@gmail.com>
* spawn sync investigation, pipe closed before uv_read_start is called
* oopsie
* win rusage
* oopsie
* Fix some things
* readable stream now works without FIFO like solution
* blob, ArrayBuffer, Buffer stdin now works
* remove unused
* add UVStreamSink
* update headers.j
* more bindings
* now works yay
* fix rusage on windows
* oops
* fix rare data
* win getUserName
* [autofix.ci] apply automated fixes
* fix build
* oopsie
* fix linux/macos
* exit code fix
* fix kill for win
* disable Bun__crashReportDumpStackTrace on Windows
* remove windows stack dump in report.zig and increase windows test timeout
* condition instead of assertion
* remove IPC again
* fix blob writer when not using TTY
* bump windows tests time again
* bump time again so we see how much we need (this is probably too much)
---------
Co-authored-by: cirospaciari <ciro.spaciai@gmail.com>
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: cirospaciari <ciro.spaciari@gmail.com>
* port 'initial support for using declarations'
1:1 port of this commit:
56a3e01244
* port 'initial support for await using declarations'
1:1 port of this commit:
1634a0b5ad
* fix cmake config for local jsc
* add global defines for symbols
* begin porting lowering implementation
based off of
https://github.com/evanw/esbuild/pull/3192
* [autofix.ci] apply automated fixes
* add some fun webkit scripts
* fix the minification bug
* refactor runtime_js, etc
* rename test file
* finished yapping
* silly silyl
* Update src/bundler.zig
* ok
* a
* Fix crash
---------
Co-authored-by: autofix-ci[bot] <114827586+autofix-ci[bot]@users.noreply.github.com>
Co-authored-by: Jarred Sumner <jarred@jarredsumner.com>
Co-authored-by: Jarred Sumner <709451+Jarred-Sumner@users.noreply.github.com>
* chore: upgrade zig to 0.12.0-dev.1828+225fe6ddb
* open as iterable
* fix building identifier cache
* fix windows build
* fix linux build
* fix linux build
* some progess
* needs more tests
* make tests easier to debug
* get metadata for constructor arg decorators
* fix some things
* merge `emitDecoratorMetadata` option
* remove `^`
* bundler tests and get option from tsconfig earlier
* remove spaces
* fix tests
* Natively support CommonJS at runtime
* cleanup how getters are handled, add fast path
* more consistent with node
* use * As
* Remove thrown modules on exception
* Handle exception better
---------
Co-authored-by: Jarred Sumner <709451+Jarred-Sumner@users.noreply.github.com>
* Add LIEF
* Compile LIEF
* Implement support for embedding files on macOS
* proof of concept
* Add zstd
* Implement runtime support
* Move some code around
* Update .gitmodules
* Upgrade zig
https://github.com/ziglang/zig/pull/15278
* leftover
* leftover
* delete dead code
* Fix extname
* Revert "Upgrade zig"
This reverts commit dd968f30bf.
* Revert "leftover"
This reverts commit 7664de7686.
* Revert "leftover"
This reverts commit 498005be06.
* various fixes
* it works!
* leftover
* Make `zig build` a little faster
* give up on code signing support
* Support Linux & macOS
* Finish removing LIEF
* few more
* Add zstd to list of deps
* make it pretty
---------
Co-authored-by: Jarred Sumner <709451+Jarred-Sumner@users.noreply.github.com>
* minify
* Update renamer.zig
* --minify-whitespace
* Speed up minification a little
* handle private names
* 5% faster minification
* use helper function
* fix nested scope slots
* `bun build --minify` gets another +8% faster
* print semicolons afterwards
* print semicolon after checking error
* after all error checking
* Delete code for generating legacy bundes
* remove extra whitespace around if statements
* print space before import identifier
* Use `@constCast`
* Make `S.Local#decls` use `BabyList(Decl)`
* Add `fromSlice` helper to `BabyList`
* Remove unnecessary optional chains
* minify `undefined, true, false`
* Another @constCast
* Implement merge adjacent local var
* Support --minify in `bun build --transform`
* skip comments when counting character frequencies
* Don't wrap commonjs with --transform on (unless targeting bun)
* Support --minify in the runtime
* Fix edgecase with import * as
* don't infinite loop
* --trnasform shouldn't mess with require
* Only track comments when minifying
---------
Co-authored-by: Jarred Sumner <709451+Jarred-Sumner@users.noreply.github.com>
