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…ions to the url polyfill The url polyfill left fileURLToPath, pathToFileURL, domainToASCII, domainToUnicode and urlToHttpOptions commented out of its exports, so in a `bun build --target=browser` bundle `fileURLToPath(...)` threw "fileURLToPath is not a function". URLPattern was missing too. Add them, following lib/internal/url.js in Node.js: - fileURLToPath: the posix and `windows: true` forms, including UNC hosts and the ERR_INVALID_URL_SCHEME, ERR_INVALID_FILE_URL_HOST and ERR_INVALID_FILE_URL_PATH errors. - pathToFileURL: posix, percent-encoding the same code points as Node.js. `windows: true` needs path.win32.resolve, which the posix-only path polyfill does not have, so it throws ERR_FEATURE_UNAVAILABLE_ON_PLATFORM rather than returning a wrong URL. - domainToASCII: Node.js runs the WHATWG hostname setter on `ws://x`, which is why "a/b" gives "a" and "a:80" gives "". The same setter is used here, from two starting hosts, because it ignores a rejected input instead of throwing. - domainToUnicode: that host with its xn-- labels decoded (RFC 3492). - urlToHttpOptions: unchanged from Node.js, null prototype included. - URLPattern: globalThis.URLPattern, like URL and URLSearchParams. The punycode decoder and posix resolve are written out rather than imported from the sibling polyfills, because build-fallbacks.ts strips a leading `import` from each built polyfill. fileURLToPathBuffer is left out: it returns a Buffer, which would need that import.
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Navigate logical layers of code changes, visualize relationships, and explore their blast radius. WalkthroughThe browser URL fallback now implements Node.js URL helpers for domain conversion, HTTP options, and file path conversion. The helpers are exported through named and default exports. A bundler test validates outputs and error codes. ChangesURL fallback APIs
Suggested reviewers: Priority: ➖ Normal Merge Risk: 🔵 Low · up to Fix the narrow compatibility mismatch and update the test string construction before merging. 🚥 Pre-merge checks | ✅ 4✅ Passed checks (4 passed)
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Inline comments:
In `@src/node-fallbacks/url.js`:
- Line 885: Update each ERR_INVALID_FILE_URL_PATH throw in the URL parsing flow,
including the sites around the existing throws, so the resulting error has its
input property set to the parsed URL before being thrown. Apply this
consistently at all corresponding throw sites while preserving the existing
error code and message.
In `@test/bundler/bundler_browser.test.ts`:
- Around line 121-143: Update the NodeUrlFileAndDomain test to import and
exercise URLPattern both as a named export and through the default node:url
export, adding assertions that validate each binding while preserving the
existing checks for the five URL utilities.
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…'s error text - ERR_INVALID_FILE_URL_PATH carries the parsed URL as `input`, as in Node.js, at all three throw sites. ERR_INVALID_FILE_URL_HOST does not, and still does not. - ERR_INVALID_FILE_URL_HOST names process.platform when there is one, and "browser" otherwise. The process polyfill has no platform, so copying Node's template would print "undefined". - pathToFileURL's non-string error names "path", as Node.js v24 does. - Strings in an ERR_INVALID_ARG_TYPE message are quoted, as in Node.js. - The bundler test also checks `input` and both URLPattern bindings. Addresses the CodeRabbit review.
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Inline comments:
In `@src/node-fallbacks/url.js`:
- Around line 759-760: Update describeReceived to truncate string values before
quoting: preserve up to 28 raw characters, or use the first 25 followed by an
ellipsis, then quote with JSON.stringify when the truncated value contains an
apostrophe and single quotes otherwise. Keep non-string formatting unchanged,
including bigint suffixes and type reporting.
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Truncate a string to 25 characters before quoting it, use double quotes when it contains an apostrophe, and print -0 and large bigints in full.
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In `@src/node-fallbacks/url.js`:
- Line 764: Update the value-display logic immediately before the return in the
relevant formatter to truncate symbol descriptions longer than 28 characters to
the first 25 characters followed by an ellipsis, while preserving existing
bigint, negative-zero, and other value formatting.
In `@test/bundler/bundler_browser.test.ts`:
- Line 140: In the test expression using message, replace both repetitive string
constructions based on "a".repeat(...) with Buffer.alloc(count, "a").toString(),
preserving the existing counts, array contents, and output formatting.
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…ent.cpp (#45764) ### Problem - 29 lines in 6 files have no user. - `source_file`, `compare_types` and `symbol_to_string` in the `queries!` list of `src/lint/types/mod.rs` have no caller. The list generates the only call of the `Services` functions of the same names in `bun_sema`. The trait is `pub`, so rustc does not check it. - `BunProcess.cpp` declares five `using X = JSC::X;` aliases that it never names. `DirEntType` in `NodeDirent.cpp` has three enumerators that nothing names. ### Fix - Delete the three list lines with their `Services` functions (21 lines), the five aliases and the three enumerators. - Correct because a word search over the sources, the tests and the generated code finds no user, and the workspace compiles for 12 targets. - Verified: `bun bd`, `bun run rust:check-all`, `cargo check --workspace --all-targets`, 8 test files (Notes). - Self-reviewed: 41 concerns raised, 33 addressed. Rejected: a `pub(crate)` narrowing of `Queries` (`resolve_name` needs a caller first), and a hold until earlier sweeps merge. ### Background - `queries!` lists each question that a lint handle (`Type`, `TsSymbol`) can ask the type checker. One line generates a `Queries` method and a forwarding call to `Services` in `bun_sema`. - `BunProcess.cpp` compiles as its own unit with `using namespace JSC;`, so the aliases change no name lookup. - A deletion of unreferenced code has one possible place, so no other design was weighed. ### Downsides - A later lint handle that needs one of the three queries must restore it. - None found for users. Checked: the heads of all 5,559 open pull requests, 12 targets, the tests in Notes. Behaviour change: none <details><summary>Notes</summary> **Removed** - `src/lint/types/mod.rs`: the `queries!` lines `source_file`, `compare_types` and `symbol_to_string`. No call of these names has a `Queries` receiver. The calls that exist go to other functions: `Checker::compare_types` and `Checker::symbol_to_string` in `bun_sema`, a private `compare_types` in `prefer_optional_chain.rs`, and the parser's `source_file`. With `Queries` made crate-private in a scratch edit, rustc reports `resolve_name` as the only query left that is never used. - `src/sema/check/services.rs`, `services/types.rs`, `services/symbols.rs`: `Services::source_file`, `Services::compare_types`, `Services::symbol_to_string`. The generated forwarding call was the only user. What they call (`Files::by_path`, `Checker::compare_types`, `Checker::symbol_to_string`, `Checker::prop_to_string`) keeps other callers. - `src/jsc/bindings/BunProcess.cpp`: the aliases `Exception`, `JSModuleLoader`, `JSModuleRecord`, `SourceOrigin`, `JSNonFinalObject`. None of the names appears in the rest of the file. The same block in `Path.cpp` and `ZigGlobalObject.cpp` is left to #43378 and #42431. - `src/jsc/bindings/NodeDirent.cpp`: the enumerators `Whiteout`, `Door` and `EventPort` of `DirEntType`, all equal to `Unknown`. No C or C++ file names them. **Open pull requests** - Compared at 2026-10-17 16:40 UTC on main 017b243 with the heads of all 5,559 open pull requests, drafts and every author included. - 156 of them touch a file of this diff (151 touch `BunProcess.cpp`). A trial merge of each with main and with this branch (`git merge-tree`) shows that the branch adds a conflict to none. - None deletes one of these lines. None adds a use of a removed name: the added lines were searched for the three query names, the five alias names in `BunProcess.cpp`, and the three enumerators. **Found dead in this run, and left alone** - Already gone on main: three lines in `JSSQLStatement.cpp` and `NodeSqlite.cpp` (#45304). - Another open pull request deletes or rewrites them: 13 commented-out lines in uSockets, uWS, `JSEventTargetCustom.cpp` and `src/node-fallbacks/url.js` (#45709, and #43730 for `url.js`), two typedefs in `InspectorHTTPServerAgent.cpp` (#45725), the `BUN_WEBKIT_VERSION` fallback in `BunProcess.cpp` (#41729), a commented-out line in `src/js/internal/html.ts` (#45682). - An open pull request uses them: `Event::currentTargetIsInShadowTree()` and the `MediaTime` overload of `JSConverter<IDLUnrestrictedDouble>` (#45415). - Held by an earlier sweep for a reason that still holds: the QUIC setters `scid_len` and `delay_onclose` (#43976, and #40220 changes the line above them). - `resolve_name`, the fourth query with no caller. tsgolint's `prefer-readonly` calls `ResolveName` and Bun's port does not, which gives a wrong autofix for a global enum. The fix is handed off and needs the query. After it, `Queries` can become `pub(crate)`, and rustc then guards the list. - Mirrors of typescript-eslint and tsgolint: the write-only fields `ThenCall::on_fulfilled`, `FinallyCall::on_finally`, `BaseTypeOfClassMember::base_type` and `heritage_token`, `TargetElement::is_shorthand`, with `TsNode::token` (as #45402 held them). Also 33 functions from macro lists in `src/lint/types/` that nothing calls, and `File::expr_tags_in_tree`. - Debugging aids: 25 hand-written `Debug` impls in `bun_lint`, 5 in `bun_format`, and `Display` for `Difference`, `FilePoll` and `Part`. - Handed off: the plugin `target` value that nothing reads (`BundlerPlugin::target`, three more members, a parameter of `JSBundlerPlugin__create`, and the Rust enum). Its removal changes an FFI signature. - Needs a decision: `PerformanceResourceTiming` cannot be constructed, so `ResourceTiming.cpp`, `NetworkLoadMetrics.cpp` and `ServerTiming.h` are reachable only from its getters. **How the candidates were found** - Ten text searches, one for each area: `src/js`, the C++ bindings (three parts), uSockets and uWS, the build scripts, the side packages, the three new crates, and commented-out code. - A relink of the debug build with `-Wl,--gc-sections`, with each dropped function mapped to its source line by `llvm-nm -l`: 517 C++ functions and 607 Rust function lines. Almost all are Windows or macOS code, release-only code, or are deleted by an open pull request. - For `bun_sema`: `pub` narrowed to `pub(crate)` on each item that no other crate names, in a scratch tree. rustc reported nothing new. - For 39 trait impls that the linker drops: delete all, compile for linux, windows and darwin and with `--all-targets`, put back each impl that an error names. What stayed deleted is a debugging aid. **Tests, debug build of this branch** (with `--timeout 600000`, because the lint and check tests need more than the default with a debug build) - `test/cli/lint/conformance.test.ts`: 3 pass. - `test/cli/lint/rules.test.ts`: 16 pass. - `test/cli/lint/native-rules.test.ts`: 166 pass. - `test/cli/lint/bun-rules.test.ts`: 100 pass. - `test/cli/check/check.test.ts`: 599 pass, 42 skip. - `test/js/node/process/process.test.js`: 188 pass, 5 skip. - `test/js/node/fs/dir.test.ts`: 23 pass. - `test/regression/issue/24129.test.ts`: 2 pass. </details> <!-- robobun:evidence:begin --> --- **no test proof** · iteration 0 · the description declares no behaviour change, so there is no failing test to prove; the existing suite in CI is the check <!-- robobun:evidence:end -->
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What does this PR do?
The url polyfill has
fileURLToPath,pathToFileURL,domainToASCIIanddomainToUnicodecommented out of its exports, and has nourlToHttpOptionsorURLPattern. So in abun build --target=browserbundle:This adds all six, following
lib/internal/url.jsin Node.js.fileURLToPath: the posix and{ windows: true }forms, UNC hosts included (anxn--host is decoded, as in Node.js), with the sameERR_INVALID_URL_SCHEME,ERR_INVALID_FILE_URL_HOST,ERR_INVALID_FILE_URL_PATHandERR_INVALID_ARG_TYPEerrors.pathToFileURL: posix. Node.js encodes the path in native code, so I measured which code points it percent-encodes (the WHATWG path set plus% [ \ ] ^ | ~) and match that.{ windows: true }needspath.win32.resolve, which the path polyfill does not have ("only the posix part"), so it throwsERR_FEATURE_UNAVAILABLE_ON_PLATFORMinstead of returning a wrong URL.domainToASCII: Node.js runs the WHATWG hostname setter onws://xthrough ada, which is why"a/b"gives"a"and"a:80"gives"". Browsers have the same setter, so it is used directly. The setter ignores an input it rejects rather than throwing, so it runs from two starting hosts: a rejected input leaves each unchanged.domainToUnicode: that host with itsxn--labels decoded, as ada'sto_unicodedoes.urlToHttpOptions: copied from Node.js, including the null prototype.URLPattern:globalThis.URLPattern, the same way the file exposesURLandURLSearchParams.Why the punycode decoder and posix resolve are inline.
build-fallbacks.tsremoves leadingimport{...}statements from each built polyfill (while (outfile.startsWith("import{"))), so importing./punycode.jsor./path.jswould leave those bindings undefined at run time. I checked that the builturl.jscontains noimportorrequire.fileURLToPathBufferis left out: it returns aBuffer, which would need that import.Overlapping PRs. #42092 rewrites this file's export block, and #28752 and #33426 edit
urlFormatand the slashed-protocol table. None of them add these functions. #42092 will conflict textually on the export block with whichever lands second; the resolution is to keep both sets of names.How did you verify your code works?
Compared against Node.js v24.12.0's own
node:url, calling each function the same way in both:src/node-fallbacks/url.jsimported directly: 49 domain inputs (IDN,xn--, fullwidth,ß, percent-encoded,/,:, IPv6, empty, non-strings) through both domain functions; 26 file URLs, each with no options,windows: falseandwindows: true; 47 paths throughpathToFileURL, including every printable ASCII special character, tab/newline/DEL, non-ASCII and relative paths; and 12 URLs plus bad inputs throughurlToHttpOptions. Errors compare by class andcode. 0 divergences.build-fallbacks.tswith bun 1.4.2 and repeated the comparison against the builturl.js: 0 divergences. This is the check that would have caught a stripped import.Added
browser/NodeUrlFileAndDomaintotest/bundler/bundler_browser.test.ts. Its expectedstdoutis the output of the same code under Node.js, not the polyfill's own output; I checked both print identical lines.I did not run
bun bd test, which needs Bun built from source. Formatted with the repo'sprettier@3.6.2and.prettierrc.