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fix(wasm): new Date(x) keeps its argument and its getters read it - #14590
On --target web, every Date built with new Date(...) is undefined: getTime() and each getter return 0 and toISOString() returns undefined. Both emit sites called the date_new bridge, which is not in the pre-interned bridge list, so emit_memcall resolved it to string id 0 and mem_call dispatched on the wrong name. date_new also ignored its argument.
Changes
emit/expr/date_error.rs, emit/expr/classes.rs: new Date(x) calls date_new_val, which is interned and forwards the argument.
emit/string_collection.rs: interns the Date bridges that the emitter calls and the runtime implements but the list was missing (date_parse, date_utc, date_value_of, date_get_timezone_offset, the UTC getters/setters, the to*String family, date_to_json).
emit/tests.rs: date_constructor_keeps_its_argument_and_getters_read_it (UTC getters only, so it does not depend on the host time zone).
Also checked in headless Chrome: a page formatting new Date(iso) showed 01/00 00:00 before and the correct local time after.
Built on macOS 27.3 (Apple M6) with the nightly from rust-toolchain.toml, LLVM 23.1.5, Node 26.13.1. I did not run the full workspace test command from the template.
Not in this PR: about 45 other memcall names the emitter uses are also missing from the interned list (several string_*, array_*, path_*, weakref_*), but those also lack a runtime bridge, so interning alone would not fix them.
Checklist
I have NOT bumped the workspace version or edited CHANGELOG.md
My commits follow the loose feat: / fix: / docs: / chore: prefix convention used in the log
I've read CONTRIBUTING.md and agree to the Code of Conduct
Improved JavaScript Date support in web builds, including construction from ISO strings and timestamps, parsing, UTC operations, formatting, and JSON conversion.
Corrected how date construction handles omitted arguments versus an explicit undefined: an omitted argument creates the current date, while undefined produces an invalid date.
raliclo
pushed a commit
to raliclo/perry
that referenced
this pull request
Nov 13, 2026
No actionable comments were generated in the recent review.
Walkthrough
For the web target, Date construction uses the interned date_new_val bridge. The emitter passes the constructor argument count, and the runtime distinguishes an omitted argument from an explicit undefined. Additional Date bridge names are pre-interned, and a test covers Date construction and related operations.
Changes: WASM Date constructor handling
Layer / File(s)
Summary
Date construction, bridge names, and validation crates/perry-codegen-wasm/src/emit/expr/classes.rs, crates/perry-codegen-wasm/src/emit/expr/date_error.rs, crates/perry-codegen-wasm/src/wasm_runtime.js, crates/perry-codegen-wasm/src/emit/string_collection.rs, crates/perry-codegen-wasm/src/emit/tests.rs, changelog.d/14590-wasm-date-constructor.md
Both Date constructor emission paths call date_new_val and pass at most one argument. The runtime creates the current date only when no argument is supplied; an explicit undefined is passed to Date. The string table adds Date bridge names. A test covers construction, timestamp and ISO conversion, UTC getters, parsing, and invalid-date NaN. The changelog records the bridge changes.
This change makes new Date(x) on the web target keep its argument and correctly distinguishes new Date() from new Date(undefined). No merge-blocking risk remains in the changed code. The failing CI checks are in unrelated code.
Pre-merge checks: 5
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Title check
The title names the main change: the WASM new Date(x) fix, where the constructor keeps its argument and the getters read it. It follows the repo's fix(wasm): prefix convention and is specific enou…
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Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check
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Description check
The description follows the repository template. It has a clear summary of the root cause and fix, a concrete list of changes with file paths, and a related-issue note (n/a, standalone). The test plan…
Description check
The PR objectives mention that the CI failure in cargo-test (product_element_identity_preserves_codegen_facts) is unrelated to this diff and also fails on main. That is a disclosed pre-existing issue,…
Full details: Title check
Explanation
The title names the main change: the WASM new Date(x) fix, where the constructor keeps its argument and the getters read it. It follows the repo's fix(wasm): prefix convention and is specific enough for a teammate scanning history.
Full details: Description check
Explanation
The description follows the repository template. It has a clear summary of the root cause and fix, a concrete list of changes with file paths, and a related-issue note (n/a, standalone). The test plan gives the exact command run, before/after results, and a headless Chrome check. It also states that the full workspace test command was not run, and it explains the other memcall names that stay out of scope. The template's checklist items are ticked. The author did not run the template's full workspace test command, and the template asks for that command, so this is a disclosed gap rather than a missing section.
Full details: Description check
Explanation
The PR objectives mention that the CI failure in cargo-test (product_element_identity_preserves_codegen_facts) is unrelated to this diff and also fails on main. That is a disclosed pre-existing issue, not a description gap.
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Actionable comments posted: 1
Fix comments: Fix CodeRabbit comments on this PR
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Inline comments:
Review comments at @crates/perry-codegen-wasm/src/emit/expr/date_error.rs:
- Line 29: Update the Date constructor emission around emit_memcall and its
corresponding classes.rs path to preserve whether an argument was omitted or
explicitly undefined; use a distinct zero-argument path or carry argument
presence through the bridge so explicit undefined produces an invalid Date. Add
a regression case confirming new Date(undefined).getTime() is NaN.
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Both `new Date` emit sites called the `date_new` bridge. That name is not
in the pre-interned bridge list, and `emit_memcall` resolves an unknown
name to string id 0, so `mem_call` dispatched on the wrong name and every
Date was `undefined`: `getTime()` and each getter returned 0 and
`toISOString()` returned undefined. `date_new` also ignored its argument.
The emit sites now call `date_new_val`, which is interned and forwards the
argument. The Date bridges that have a runtime implementation but were
missing from the list (`Date.parse`, `Date.UTC`, `valueOf`, the UTC
getters and setters, `getTimezoneOffset`, the `to*String` family,
`toJSON`) are interned too.
`date_constructor_keeps_its_argument_and_getters_read_it` prints
"0 / undefined / undefined-undefined-undefined ..." without this change
and matches Node with it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CUQanVsnitcrmYLAWWPc3p
Both constructor paths stored `undefined` for a missing argument, and
`date_new_val` treated any `undefined` as `new Date()`, so an explicit
`new Date(undefined)` got the current time instead of a NaN time value.
The emitter now passes an argument count of 0 for `new Date()`, and the
bridge chooses on the count.
The Date test gains an explicit-`undefined` case; with the old bridge it
prints `false` (a real timestamp).
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01CUQanVsnitcrmYLAWWPc3p
Rebased onto 46b2339d82 (current main, which includes #14604, so the formatting / clippy / tokio-ban / tls-budget reds are gone from this branch). cargo test -p perry-codegen-wasm re-run on the new base: 47 passed. The base SHA in the description refers to the earlier base.
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Summary
On
--target web, everyDatebuilt withnew Date(...)isundefined:getTime()and each getter return 0 andtoISOString()returns undefined. Both emit sites called thedate_newbridge, which is not in the pre-interned bridge list, soemit_memcallresolved it to string id 0 andmem_calldispatched on the wrong name.date_newalso ignored its argument.Changes
emit/expr/date_error.rs,emit/expr/classes.rs:new Date(x)callsdate_new_val, which is interned and forwards the argument.emit/string_collection.rs: interns the Date bridges that the emitter calls and the runtime implements but the list was missing (date_parse,date_utc,date_value_of,date_get_timezone_offset, the UTC getters/setters, theto*Stringfamily,date_to_json).emit/tests.rs:date_constructor_keeps_its_argument_and_getters_read_it(UTC getters only, so it does not depend on the host time zone).Related issue
n/a (found while porting a page to
--target web).Test plan
056c5c7239)0 / undefined / undefined-undefined-undefined undefined:undefined / undefined / falseperry-codegen-wasmAlso checked in headless Chrome: a page formatting
new Date(iso)showed01/00 00:00before and the correct local time after.Built on macOS 27.3 (Apple M6) with the nightly from
rust-toolchain.toml, LLVM 23.1.5, Node 26.13.1. I did not run the full workspace test command from the template.Not in this PR: about 45 other memcall names the emitter uses are also missing from the interned list (several
string_*,array_*,path_*,weakref_*), but those also lack a runtime bridge, so interning alone would not fix them.Checklist
feat:/fix:/docs:/chore:prefix convention used in the log🤖 Generated with Claude Code
https://claude.ai/code/session_01CUQanVsnitcrmYLAWWPc3p
Summary by CodeRabbit
Datesupport in web builds, including construction from ISO strings and timestamps, parsing, UTC operations, formatting, and JSON conversion.undefined: an omitted argument creates the current date, whileundefinedproduces an invalid date.