Effect 4 in the popular suite, class field and optional chain fixes (v0.6.1)

CHANGELOG.md

@@ -1,5 +1,18 @@
 # Changelog
 
+## [0.6.1] - 2026-10-15
+
+### Fixed
+- Class fields of a class with an implicit constructor were not initialized when a subclass constructed it (`class B extends A { x = 1 }`, `class C extends B {}`, `new C().x` was `undefined`). Effect's `Data.TaggedError` classes lost their `_tag`, so `Effect.catchTag` never matched
+- A short-circuited optional chain stored in a binding, passed as an argument or returned (`const v = a?.b`) was not strictly equal to `undefined` when read from code compiled by the bytecode VM, so `v === undefined` was `false`
+- Parentheses now end an optional chain. A short-circuit of `a?.b` no longer skipped the rest of `(a?.b).c`, `(a?.b)()` or `delete (a?.b).c`, which now throw a `TypeError` like V8. `` (a?.b)`t` ``, `(a?.b).c = 1` and `(a?.b).c++` were rejected as syntax errors and now parse
+- Optional chains are rejected as destructuring assignment targets (`[a?.b] = []`, `({ x: (a?.b) } = {})`), as the spec requires
+- A method call on `null` or `undefined` in the tree-walker said "Cannot convert undefined to object"; it now says "Cannot read properties of undefined (reading 'name')", like V8 and the bytecode VM
+- `EstreeSerializer` emits ESTree's `ChainExpression` around each optional chain, ending where parentheses close it, matching `@babel/parser`'s `estree` output
+
+### Added
+- Effect 4 (`effect` 4.0.5) in the popular-packages suite, byte-equal with Node: 205 libraries
+
 ## [0.6.0] - 2026-10-15
 
 ### Added

COMPAT.md

@@ -3,13 +3,13 @@
 Generated from a completed `test262` pass. Do not edit by hand.
 
 - Refresh: `./bin/compat-report`
-- Snapshot time: `2026-10-15T07:00:43+00:00`
-- Chunk size: `25`
+- Snapshot time: `2026-10-15T09:00:12+00:00`
+- Chunk size: `250`
 - Timeout: `300s`
-- Jobs: `4`
+- Jobs: `8`
 - Groups: `159`
 - Test files: `50506`
-- Git: `main` @ `73b9ef12` (dirty)
+- Git: `test/popular-effect-4` @ `79d1bf6` (dirty)
 
 ## Summary
 
@@ -196,26 +196,26 @@ Generated from a completed `test262` pass. Do not edit by hand.
 
 | Group | Kind | Duration | Files | Sample |
 |---|---|---:|---:|---|
-| staging/sm | NORMAL | 97.210s | 1 | `test262/test/staging/sm/Date/dst-offset-caching-3-of-8.js` |
-| staging/sm | NORMAL | 97.063s | 1 | `test262/test/staging/sm/Date/dst-offset-caching-4-of-8.js` |
-| staging/sm | NORMAL | 96.587s | 1 | `test262/test/staging/sm/Date/dst-offset-caching-7-of-8.js` |
-| staging/sm | NORMAL | 95.757s | 1 | `test262/test/staging/sm/Date/dst-offset-caching-2-of-8.js` |
-| staging/sm | NORMAL | 94.823s | 1 | `test262/test/staging/sm/Date/dst-offset-caching-8-of-8.js` |
-| staging/sm | NORMAL | 89.580s | 1 | `test262/test/staging/sm/Date/dst-offset-caching-5-of-8.js` |
-| staging/sm | NORMAL | 76.576s | 1 | `test262/test/staging/sm/Date/dst-offset-caching-1-of-8.js` |
-| staging/sm | NORMAL | 74.883s | 1 | `test262/test/staging/sm/Date/dst-offset-caching-6-of-8.js` |
-| built-ins/RegExp/property-escapes/generated | NORMAL | 55.091s | 5 | `test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Cased_Letter.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Close_Punctuation.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Connector_Punctuation.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Control.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Currency_Symbol.js` |
-| built-ins/RegExp/property-escapes/generated | NORMAL | 54.946s | 5 | `test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Mark.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Math_Symbol.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Modifier_Letter.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Modifier_Symbol.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Nonspacing_Mark.js` |
-| built-ins/RegExp/property-escapes/generated | NORMAL | 54.752s | 5 | `test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Other_Punctuation.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Other_Symbol.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Paragraph_Separator.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Private_Use.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Punctuation.js` |
-| built-ins/RegExp/property-escapes/generated | NORMAL | 54.349s | 5 | `test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Separator.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Space_Separator.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Spacing_Mark.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Surrogate.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Symbol.js` |
-| built-ins/RegExp/property-escapes/generated | NORMAL | 53.598s | 5 | `test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Dash_Punctuation.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Decimal_Number.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Enclosing_Mark.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Final_Punctuation.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Format.js` |
-| staging/sm | NORMAL | 53.299s | 1 | `test262/test/staging/sm/TypedArray/sort_large_countingsort.js` |
-| built-ins/RegExp/property-escapes/generated | NORMAL | 52.619s | 5 | `test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Number.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Open_Punctuation.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Other.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Other_Letter.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Other_Number.js` |
-| built-ins/RegExp/property-escapes/generated | NORMAL | 51.270s | 5 | `test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Initial_Punctuation.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Letter.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Letter_Number.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Line_Separator.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Lowercase_Letter.js` |
-| staging/sm | NORMAL | 47.068s | 1 | `test262/test/staging/sm/TypedArray/element-setting-converts-using-ToNumber.js` |
-| built-ins/RegExp/property-escapes/generated | NORMAL | 46.011s | 5 | `test262/test/built-ins/RegExp/property-escapes/generated/Script_Extensions_-_Tai_Le.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/Script_Extensions_-_Tai_Tham.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/Script_Extensions_-_Tai_Viet.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/Script_Extensions_-_Takri.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/Script_Extensions_-_Tamil.js` |
-| built-ins/RegExp/property-escapes/generated | NORMAL | 45.346s | 5 | `test262/test/built-ins/RegExp/property-escapes/generated/Script_Extensions_-_Sinhala.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/Script_Extensions_-_Sogdian.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/Script_Extensions_-_Sora_Sompeng.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/Script_Extensions_-_Soyombo.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/Script_Extensions_-_Sundanese.js` |
-| built-ins/RegExp/property-escapes/generated | NORMAL | 45.069s | 5 | `test262/test/built-ins/RegExp/property-escapes/generated/Script_Extensions_-_Marchen.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/Script_Extensions_-_Masaram_Gondi.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/Script_Extensions_-_Medefaidrin.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/Script_Extensions_-_Meetei_Mayek.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/Script_Extensions_-_Mende_Kikakui.js` |
+| built-ins/RegExp/property-escapes/generated | NORMAL | 242.052s | 104 | `test262/test/built-ins/RegExp/property-escapes/generated/Script_-_Yi.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/Script_-_Zanabazar_Square.js`<br>...<br>`test262/test/built-ins/RegExp/property-escapes/generated/Script_Extensions_-_Nag_Mundari.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/Script_Extensions_-_Nandinagari.js` |
+| built-ins/RegExp/property-escapes/generated | NORMAL | 187.951s | 105 | `test262/test/built-ins/RegExp/property-escapes/generated/Script_Extensions_-_New_Tai_Lue.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/Script_Extensions_-_Newa.js`<br>...<br>`test262/test/built-ins/RegExp/property-escapes/generated/strings/RGI_Emoji_ZWJ_Sequence-negative-u.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/strings/RGI_Emoji_ZWJ_Sequence.js` |
+| built-ins/RegExp/property-escapes/generated | NORMAL | 159.097s | 62 | `test262/test/built-ins/RegExp/property-escapes/generated/ASCII.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/ASCII_Hex_Digit.js`<br>...<br>`test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Symbol.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Titlecase_Letter.js` |
+| built-ins/RegExp/property-escapes/generated | NORMAL | 158.016s | 63 | `test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Unassigned.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/General_Category_-_Uppercase_Letter.js`<br>...<br>`test262/test/built-ins/RegExp/property-escapes/generated/Script_-_Glagolitic.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/Script_-_Gothic.js` |
+| built-ins/RegExp/property-escapes/generated | NORMAL | 156.964s | 62 | `test262/test/built-ins/RegExp/property-escapes/generated/Script_-_Grantha.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/Script_-_Greek.js`<br>...<br>`test262/test/built-ins/RegExp/property-escapes/generated/Script_-_Newa.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/Script_-_Nko.js` |
+| built-ins/RegExp/property-escapes/generated | NORMAL | 155.852s | 63 | `test262/test/built-ins/RegExp/property-escapes/generated/Script_-_Nushu.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/Script_-_Nyiakeng_Puachue_Hmong.js`<br>...<br>`test262/test/built-ins/RegExp/property-escapes/generated/Script_-_Warang_Citi.js`<br>`test262/test/built-ins/RegExp/property-escapes/generated/Script_-_Yezidi.js` |
+| staging/sm | NORMAL | 66.263s | 1 | `test262/test/staging/sm/Date/dst-offset-caching-3-of-8.js` |
+| staging/sm | NORMAL | 65.741s | 1 | `test262/test/staging/sm/Date/dst-offset-caching-7-of-8.js` |
+| staging/sm | NORMAL | 65.501s | 1 | `test262/test/staging/sm/Date/dst-offset-caching-2-of-8.js` |
+| staging/sm | NORMAL | 64.831s | 1 | `test262/test/staging/sm/Date/dst-offset-caching-5-of-8.js` |
+| staging/sm | NORMAL | 64.287s | 1 | `test262/test/staging/sm/Date/dst-offset-caching-8-of-8.js` |
+| staging/sm | NORMAL | 56.967s | 1 | `test262/test/staging/sm/Date/dst-offset-caching-4-of-8.js` |
+| staging/sm | NORMAL | 55.580s | 1 | `test262/test/staging/sm/Date/dst-offset-caching-6-of-8.js` |
+| staging/sm | NORMAL | 54.320s | 250 | `test262/test/staging/sm/Proxy/regress-bug1062349.js`<br>`test262/test/staging/sm/Proxy/regress-bug950407.js`<br>...<br>`test262/test/staging/sm/TypedArray/object-defineproperty.js`<br>`test262/test/staging/sm/TypedArray/of.js` |
+| staging/sm | NORMAL | 50.157s | 1 | `test262/test/staging/sm/Date/dst-offset-caching-1-of-8.js` |
+| intl402 | NORMAL | 47.529s | 22 | `test262/test/intl402/constructors-string-and-single-element-array.js`<br>`test262/test/intl402/constructors-taint-Object-prototype-2.js`<br>...<br>`test262/test/intl402/supportedLocalesOf-throws-if-element-not-string-or-object.js`<br>`test262/test/intl402/supportedLocalesOf-unicode-extensions-ignored.js` |
+| staging/sm | NORMAL | 42.604s | 250 | `test262/test/staging/sm/extensions/function-caller-skips-eval-frames.js`<br>`test262/test/staging/sm/extensions/function-properties.js`<br>...<br>`test262/test/staging/sm/regress/regress-554955-6.js`<br>`test262/test/staging/sm/regress/regress-559402-1.js` |
+| staging/sm | NORMAL | 40.491s | 250 | `test262/test/staging/sm/TypedArray/prototype-constructor-identity.js`<br>`test262/test/staging/sm/TypedArray/seal-and-freeze.js`<br>...<br>`test262/test/staging/sm/extensions/extension-methods-reject-null-undefined-this.js`<br>`test262/test/staging/sm/extensions/for-loop-with-lexical-declaration-and-nested-function-statement.js` |
+| staging/sm | NORMAL | 36.177s | 1 | `test262/test/staging/sm/TypedArray/sort_large_countingsort.js` |
+| built-ins/decodeURI | NORMAL | 32.058s | 1 | `test262/test/built-ins/decodeURI/S15.1.3.1_A2.5_T1.js` |
 
 ## Runner Caveats