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7fb2b7a12dc8fba480e482444d15cd3eb0ed342c
bun.sh/src
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Claude Bot 7fb2b7a12d Implement typeof evaluation for defined globals at build time 
Major improvement: typeof expressions for defined globals like Bun are now
evaluated at build time, enabling much better dead code elimination.

Changes:
- typeof Bun evaluates to "object" for --target=bun, "undefined" for --target=browser
- typeof globalThis.Bun also evaluates at build time
- Const expressions like `const isBun = typeof Bun !== 'undefined'` now become
  `var isBun = !0` (true) or `var isBun = !1` (false) at build time

This enables automatic DCE for patterns like:
- if (typeof Bun === "object") { /* bun code */ }
- if (typeof Bun !== "undefined") { /* bun code */ }

The implementation checks for defined identifiers and dot expressions in the
typeof operator and replaces them with the appropriate string literal based on
the define configuration.

Note: While typeof is now evaluated, full constant propagation for local
variables is not yet implemented, so patterns like:
`const isBun = typeof Bun !== 'undefined'; if (isBun) { ... }`
still require the if statement optimization separately.

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

Co-Authored-By: Claude <noreply@anthropic.com>
2025-09-09 23:34:07 +00:00
..
allocators
Static allocator polymorphism (#22227)
2025-09-03 15:40:44 -07:00
analytics
Refactor Zig imports and file structure (part 1) (#21270)
2025-07-22 17:51:38 -07:00
api
Implement jsxSideEffects option for JSX dead code elimination control (#22298)
2025-09-01 02:35:55 -07:00
ast
Implement typeof evaluation for defined globals at build time
2025-09-09 23:34:07 +00:00
async
Rename disabled parameter in Output.scoped (#21769)
2025-08-11 20:19:34 -07:00
bake
Static allocator polymorphism (#22227)
2025-09-03 15:40:44 -07:00
base64
Refactor Zig imports and file structure (part 1) (#21270)
2025-07-22 17:51:38 -07:00
bun.js
Add src/bun.js/bindings/v8/CLAUDE.md
2025-09-07 00:08:43 -07:00
bundler
Fix Windows compilation issues with embedded resources and relative paths (#22365)
2025-09-04 18:17:14 -07:00
cli
feat: add --workspaces support for bun run (#22415)
2025-09-06 13:57:47 -07:00
codegen
Fix structuredClone pointer advancement and File name preservation for Blob/File objects (#22282)
2025-08-31 13:52:43 -07:00
collections
Static allocator polymorphism (#22227)
2025-09-03 15:40:44 -07:00
create
Replace catch bun.outOfMemory() with safer alternatives (#22141)
2025-08-26 12:50:25 -07:00
css
Replace catch bun.outOfMemory() with safer alternatives (#22141)
2025-08-26 12:50:25 -07:00
deps
node:_http_server: implement Server.prototype.closeIdleConnections (#22234)
2025-09-04 15:18:31 -07:00
errno
Sort imports in all files (#21119)
2025-07-21 13:26:47 -07:00
fs
Refactor Zig imports and file structure (part 1) (#21270)
2025-07-22 17:51:38 -07:00
glob
Make BoundedArray more compact, shrink Data in sql from 32 bytes to 24 bytes (#22210)
2025-08-28 17:34:35 -07:00
http
fix(fetch) handle 101 (#22390)
2025-09-04 18:06:47 -07:00
init
bun bake templates: --source-map -> --sourcemap (#21130)
2025-07-17 03:13:48 -07:00
install
fix: handle empty chunked gzip responses correctly (#22360)
2025-09-03 18:57:39 -07:00
interchange
fix(yaml): parsing strings that look like numbers (#22102)
2025-08-24 14:06:39 -07:00
io
Replace catch bun.outOfMemory() with safer alternatives (#22141)
2025-08-26 12:50:25 -07:00
js
Fix request body streaming in node-fetch wrapper. (#22458)
2025-09-06 22:40:41 -07:00
js_lexer
Sort imports in all files (#21119)
2025-07-21 13:26:47 -07:00
libarchive
Refactor Zig imports and file structure (part 1) (#21270)
2025-07-22 17:51:38 -07:00
napi
Replace catch bun.outOfMemory() with safer alternatives (#22141)
2025-08-26 12:50:25 -07:00
node-fallbacks
node-fallbacks:buffer: fix numberIsNaN ReferenceError (#21527)
2025-07-31 22:07:17 -07:00
paths
Rename disabled parameter in Output.scoped (#21769)
2025-08-11 20:19:34 -07:00
ptr
Fix assertion failure in JSTranspiler (#22409)
2025-09-04 19:45:05 -07:00
resolver
Implement jsxSideEffects option for JSX dead code elimination control (#22298)
2025-09-01 02:35:55 -07:00
s3
Make BoundedArray more compact, shrink Data in sql from 32 bytes to 24 bytes (#22210)
2025-08-28 17:34:35 -07:00
safety
Static allocator polymorphism (#22227)
2025-09-03 15:40:44 -07:00
semver
zig: delete deprecated some bun.jsc apis (#21309)
2025-07-23 17:10:58 -07:00
shell
Static allocator polymorphism (#22227)
2025-09-03 15:40:44 -07:00
sourcemap
Replace catch bun.outOfMemory() with safer alternatives (#22141)
2025-08-26 12:50:25 -07:00
sql
fix(Bun.SQL) fix SSLRequest (#22378)
2025-09-03 18:59:15 -07:00
string
Static allocator polymorphism (#22227)
2025-09-03 15:40:44 -07:00
sys
Replace catch bun.outOfMemory() with safer alternatives (#22141)
2025-08-26 12:50:25 -07:00
test
Sort imports in all files (#21119)
2025-07-21 13:26:47 -07:00
threading
Static allocator polymorphism (#22227)
2025-09-03 15:40:44 -07:00
valkey
(#19041): Enable connecting to different databases within Redis (#22385)
2025-09-04 14:25:22 -07:00
vm
Add support for node:vm.SyntheticModule (#19878)
2025-06-04 19:41:26 -07:00
watcher
Rename disabled parameter in Output.scoped (#21769)
2025-08-11 20:19:34 -07:00
.clang-format
…
allocators.zig
Static allocator polymorphism (#22227)
2025-09-03 15:40:44 -07:00
analytics.zig
Add Bun.YAML.parse and YAML imports (#22073)
2025-08-23 06:55:30 -07:00
asan-config.c
Fix Linux ASan debug builds (#19657)
2025-05-14 18:42:42 -07:00
asan.zig
Add asan checks to HiveArray (#21449)
2025-07-29 19:35:46 -07:00
ast.zig
Refactor Zig imports and file structure (part 1) (#21270)
2025-07-22 17:51:38 -07:00
bake.bind.ts
Refactor Zig imports and file structure (part 1) (#21270)
2025-07-22 17:51:38 -07:00
bake.zig
Replace catch bun.outOfMemory() with safer alternatives (#22141)
2025-08-26 12:50:25 -07:00
bits.zig
remove all usingnamespace in css (#19067)
2025-04-17 14:17:08 -07:00
boringssl.zig
Refactor Zig imports and file structure (part 1) (#21270)
2025-07-22 17:51:38 -07:00
brotli.zig
fix: handle empty chunked gzip responses correctly (#22360)
2025-09-03 18:57:39 -07:00
btjs.zig
Refactor Zig imports and file structure (part 1) (#21270)
2025-07-22 17:51:38 -07:00
bun.exe.manifest
Enable Windows long path support (#21244)
2025-07-20 23:04:17 -07:00
bun.ico
…
bun.js.zig
internal: Remove unnecessary destruct_main_thread_on_exit flag in favor of method (#22294)
2025-09-01 01:12:11 -07:00
bun.zig
Static allocator polymorphism (#22227)
2025-09-03 15:40:44 -07:00
bunfig.zig
Replace catch bun.outOfMemory() with safer alternatives (#22141)
2025-08-26 12:50:25 -07:00
c-headers-for-zig.h
node:zlib: add zstd (#20313)
2025-06-12 14:20:28 -07:00
cache.zig
Rename disabled parameter in Output.scoped (#21769)
2025-08-11 20:19:34 -07:00
ci_info.zig
Sort imports in all files (#21119)
2025-07-21 13:26:47 -07:00
cli.zig
Detect bun bd
2025-09-07 00:46:36 -07:00
collections.zig
Make BoundedArray more compact, shrink Data in sql from 32 bytes to 24 bytes (#22210)
2025-08-28 17:34:35 -07:00
compile_target.zig
fix: handle empty chunked gzip responses correctly (#22360)
2025-09-03 18:57:39 -07:00
comptime_string_map.zig
Delete incorrect assertion in ComptimeStringMap (#21504)
2025-07-31 00:56:50 -07:00
copy_file.zig
Rename disabled parameter in Output.scoped (#21769)
2025-08-11 20:19:34 -07:00
crash_handler.zig
Fix stack traces in crash handler (#22414)
2025-09-04 18:14:47 -07:00
csrf.zig
Refactor Zig imports and file structure (part 1) (#21270)
2025-07-22 17:51:38 -07:00
darwin.zig
Sort imports in all files (#21119)
2025-07-21 13:26:47 -07:00
defines-table.zig
Refactor Zig imports and file structure (part 1) (#21270)
2025-07-22 17:51:38 -07:00
defines.zig
initial attempt
2025-09-09 13:42:10 +00:00
dir.zig
Sort imports in all files (#21119)
2025-07-21 13:26:47 -07:00
dns.zig
Refactor Zig imports and file structure (part 1) (#21270)
2025-07-22 17:51:38 -07:00
env_loader.zig
Fix env loader buffer overflow by using stack fallback allocator (#21416)
2025-07-28 00:13:17 -07:00
env.zig
Dev server refactoring, part 1 (mainly IncrementalGraph) (#22010)
2025-08-22 23:04:58 -07:00
fallback-backend.html
Fix formatters not running in CI + delete unnecessary files (#19433)
2025-05-08 23:22:16 -07:00
fallback.html
Fix formatters not running in CI + delete unnecessary files (#19433)
2025-05-08 23:22:16 -07:00
fallback.ts
…
favicon.png
…
fd.zig
Fix pipeline stack errors on Windows (#21800)
2025-08-14 18:03:26 -07:00
feature_flags.zig
Unskip some tests (#22116)
2025-08-27 06:39:11 -07:00
fixtures_example.com.html
Fix formatters not running in CI + delete unnecessary files (#19433)
2025-05-08 23:22:16 -07:00
fmt.bind.ts
…
fmt.zig
feat(MYSQL) Bun.SQL mysql support (#21968)
2025-08-21 15:28:15 -07:00
fs.zig
Fix ESM <> CJS dual-package hazard determinism bug (#22231)
2025-08-30 02:50:35 -07:00
generated_perf_trace_events.zig
Add Bun.YAML.parse and YAML imports (#22073)
2025-08-23 06:55:30 -07:00
generated_versions_list.zig
…
glob.zig
Revert "add support for "workspaces.nohoist" and "workspaces.hoistingLimits" (#20124)"
2025-06-03 23:51:03 -07:00
Global.zig
Fix mimalloc memory usage regression (#21550)
2025-08-01 23:38:34 -07:00
handle_oom.zig
Replace catch bun.outOfMemory() with safer alternatives (#22141)
2025-08-26 12:50:25 -07:00
heap_breakdown.zig
Static allocator polymorphism (#22227)
2025-09-03 15:40:44 -07:00
highway.zig
Refactor Zig imports and file structure (part 1) (#21270)
2025-07-22 17:51:38 -07:00
hmac.zig
Refactor Zig imports and file structure (part 1) (#21270)
2025-07-22 17:51:38 -07:00
HTMLScanner.zig
Make BoundedArray more compact, shrink Data in sql from 32 bytes to 24 bytes (#22210)
2025-08-28 17:34:35 -07:00
http.zig
fix(fetch) handle 101 (#22390)
2025-09-04 18:06:47 -07:00
identity_context.zig
implement "nodeLinker": "isolated" in bun install (#20440)
2025-07-09 00:19:57 -07:00
import_record.zig
Refactor Zig imports and file structure (part 1) (#21270)
2025-07-22 17:51:38 -07:00
ini.zig
Refactor Zig imports and file structure (part 1) (#21270)
2025-07-22 17:51:38 -07:00
interchange.zig
Add Bun.YAML.parse and YAML imports (#22073)
2025-08-23 06:55:30 -07:00
js_lexer_tables.zig
Refactor Zig imports and file structure (part 1) (#21270)
2025-07-22 17:51:38 -07:00
js_lexer.zig
Replace catch bun.outOfMemory() with safer alternatives (#22141)
2025-08-26 12:50:25 -07:00
js_parser.zig
Clean up DCE implementation and document const pattern limitation
2025-09-09 14:30:18 +00:00
js_printer.zig
Avoid emitting DCE annotations at runtime (#22300)
2025-09-01 02:56:59 -07:00
jsc_stub.zig
…
linear_fifo.zig
Sort imports in all files (#21119)
2025-07-21 13:26:47 -07:00
linker.lds
Better error message for NAPI modules which access unsupported libuv functions (#18503)
2025-03-26 23:57:10 -07:00
linker.zig
Refactor Zig imports and file structure (part 1) (#21270)
2025-07-22 17:51:38 -07:00
linux.zig
Refactor Zig imports and file structure (part 1) (#21270)
2025-07-22 17:51:38 -07:00
logger.zig
fix logger.zig from negative value error (#21876)
2025-08-14 21:12:22 -07:00
logo.svg
…
macho.zig
Sort imports in all files (#21119)
2025-07-21 13:26:47 -07:00
main_test.zig
Refactor Zig imports and file structure (part 1) (#21270)
2025-07-22 17:51:38 -07:00
main_wasm.zig
Replace catch bun.outOfMemory() with safer alternatives (#22141)
2025-08-26 12:50:25 -07:00
main.zig
Refactor Zig imports and file structure (part 1) (#21270)
2025-07-22 17:51:38 -07:00
memory.zig
Static allocator polymorphism (#22227)
2025-09-03 15:40:44 -07:00
meta.zig
Static allocator polymorphism (#22227)
2025-09-03 15:40:44 -07:00
node_fallbacks.zig
Refactor Zig imports and file structure (part 1) (#21270)
2025-07-22 17:51:38 -07:00
open.zig
Refactor Zig imports and file structure (part 1) (#21270)
2025-07-22 17:51:38 -07:00
options.zig
Improve DCE for --target=browser with Bun-specific optimizations
2025-09-09 15:33:11 +00:00
output.zig
Fix flickering in bun updated --interactive (#21964)
2025-08-18 20:02:08 -07:00
OutputFile.zig
Refactor Zig imports and file structure (part 1) (#21270)
2025-07-22 17:51:38 -07:00
patch.zig
Replace catch bun.outOfMemory() with safer alternatives (#22141)
2025-08-26 12:50:25 -07:00
paths.zig
Sort imports in all files (#21119)
2025-07-21 13:26:47 -07:00
pe.zig
Sort imports in all files (#21119)
2025-07-21 13:26:47 -07:00
perf.zig
Sort imports in all files (#21119)
2025-07-21 13:26:47 -07:00
pool.zig
Sort imports in all files (#21119)
2025-07-21 13:26:47 -07:00
Progress.zig
Sort imports in all files (#21119)
2025-07-21 13:26:47 -07:00
ptr.zig
Static allocator polymorphism (#22227)
2025-09-03 15:40:44 -07:00
renamer.zig
Refactor Zig imports and file structure (part 1) (#21270)
2025-07-22 17:51:38 -07:00
result.zig
…
router.zig
Replace catch bun.outOfMemory() with safer alternatives (#22141)
2025-08-26 12:50:25 -07:00
runtime.bun.js
…
runtime.js
Fix NODE_PATH for bun build (#20576)
2025-06-22 20:51:45 -07:00
runtime.zig
Refactor Zig imports and file structure (part 1) (#21270)
2025-07-22 17:51:38 -07:00
safety.zig
Static allocator polymorphism (#22227)
2025-09-03 15:40:44 -07:00
semver.zig
…
sha.zig
Sort imports in all files (#21119)
2025-07-21 13:26:47 -07:00
StandaloneModuleGraph.zig
Fix Windows compilation issues with embedded resources and relative paths (#22365)
2025-09-04 18:17:14 -07:00
StaticHashMap.zig
Sort imports in all files (#21119)
2025-07-21 13:26:47 -07:00
string.zig
Implement Bun.YAML.stringify (#22183)
2025-08-31 18:27:51 -07:00
symbols.def
Implement more v8::Array::New overloads, v8::Object::{Get,Set}, v8::Value::StrictEquals, v8::Array::Iterate (#20737)
2025-07-13 04:27:43 -07:00
symbols.dyn
Implement more v8::Array::New overloads, v8::Object::{Get,Set}, v8::Value::StrictEquals, v8::Array::Iterate (#20737)
2025-07-13 04:27:43 -07:00
symbols.txt
Implement more v8::Array::New overloads, v8::Object::{Get,Set}, v8::Value::StrictEquals, v8::Array::Iterate (#20737)
2025-07-13 04:27:43 -07:00
sys_uv.zig
zig: delete deprecated bun.jsc.Maybe (#21327)
2025-07-25 12:38:06 -07:00
sys.zig
Fix Windows compilation issues with embedded resources and relative paths (#22365)
2025-09-04 18:17:14 -07:00
system_timer.zig
Sort imports in all files (#21119)
2025-07-21 13:26:47 -07:00
threading.zig
Static allocator polymorphism (#22227)
2025-09-03 15:40:44 -07:00
tmp.zig
zig: delete deprecated bun.jsc.Maybe (#21327)
2025-07-25 12:38:06 -07:00
tracy.zig
Sort imports in all files (#21119)
2025-07-21 13:26:47 -07:00
trait.zig
…
transpiler.zig
Replace catch bun.outOfMemory() with safer alternatives (#22141)
2025-08-26 12:50:25 -07:00
tsconfig.json
Fix formatters not running in CI + delete unnecessary files (#19433)
2025-05-08 23:22:16 -07:00
unit_test.zig
Sort imports in all files (#21119)
2025-07-21 13:26:47 -07:00
url.zig
Rename disabled parameter in Output.scoped (#21769)
2025-08-11 20:19:34 -07:00
util.zig
Sort imports in all files (#21119)
2025-07-21 13:26:47 -07:00
walker_skippable.zig
Replace catch bun.outOfMemory() with safer alternatives (#22141)
2025-08-26 12:50:25 -07:00
Watcher.zig
Replace catch bun.outOfMemory() with safer alternatives (#22141)
2025-08-26 12:50:25 -07:00
which_npm_client.zig
Refactor Zig imports and file structure (part 1) (#21270)
2025-07-22 17:51:38 -07:00
which.zig
Rename disabled parameter in Output.scoped (#21769)
2025-08-11 20:19:34 -07:00
windows-app-info.rc
Enable Windows long path support (#21244)
2025-07-20 23:04:17 -07:00
windows.zig
Add Bun.YAML.parse and YAML imports (#22073)
2025-08-23 06:55:30 -07:00
work_pool.zig
Sort imports in all files (#21119)
2025-07-21 13:26:47 -07:00
workaround_missing_symbols.zig
Refactor Zig imports and file structure (part 1) (#21270)
2025-07-22 17:51:38 -07:00
wyhash.zig
Sort imports in all files (#21119)
2025-07-21 13:26:47 -07:00
zlib.test.gz
…
zlib.test.txt
…
zlib.zig
fix: handle empty chunked gzip responses correctly (#22360)
2025-09-03 18:57:39 -07:00