Update dependency Jint to 4.9.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
Jint	4.8.0 → 4.9.0

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Release Notes

sebastienros/jint (Jint)

v4.9.0

Highlights

Jint 4.9.0 is a large release focused on performance, CLR interop ergonomics, and ECMAScript spec coverage.

New language features

• Import Defer and Source Phase Imports — import defer * as ns from "mod" / import.defer() and import source x from "mod" / import.source() (TC39 proposals; 346 + 428 test262 tests pass) (#​2396)
• Import Text — import txt from "./file.txt" with { type: "text" } (TC39 Stage 3; complements the existing json / bytes paths) (#​2403)

Performance

The interpreter and built-ins got broad attention this release — see the v4.8.0 → v4.9.0 comparison table below for measured deltas.

• Custom regex engine interpreter optimized (#​2388)
• URI decode / unescape: faster and lower-allocation (#​2389)
• Array.prototype.sort / indexOf / includes / concat and sparse-array conversion optimized (#​2408)
• Lazy backing for new Array(N) plus Array.Copy fast paths for shift / unshift / splice (#​2451)
• Shape-versioned inline cache for member-expression reads (#​2412)
• FunctionEnvironment pooled per JintFunctionDefinition.State (#​2413)
• Identifier resolution: cached binding location in the slot fast path, walks skipped through empty function environments, inline small block-env slot resets (#​2416, #​2419, #​2420)
• Recursion pool + zero-alloc JsString primitive reads (#​2450)
• Avoid double-evaluating assignment bases in member access (#​2402)

CLR interop

• New opt-in Options.Interop.PreferJsPrototypeMethods() makes JS prototype methods win over CLR methods on wrapped objects (list.reverse() / list.sort() now do the JS thing on IList<T>) (#​2440)
• JS function call signatures preserved when functions are stored in Dictionary<string, object> (#​2392)
• Non-string CLR dictionary keys are now supported (#​2449)
• ThrowOnUnresolvedMember no longer throws on missing dictionary keys (#​2446)
• Fixed MissingMemberException on implicit string coercion of CLR objects (#​2439)
• CLR exceptions raised from JS now carry the originating JS source location and call stack — read via JintException.TryGetJavaScriptLocation / TryGetJavaScriptCallStack, or via JavaScriptException.Location when using CatchClrExceptions() (#​2459)

Correctness & spec coverage

• Async for-of destructuring resume bugs fixed (#​2453, #​2456)
• Module system correctness improvements (#​2395)
• Function.prototype.toString() returns the original source text for non-native functions (#​2394)
• Custom-engine regex literals now honor the prepare-time RegexTimeout (#​2457)
• Regex parsing cleanup and improved fallback-to-custom-engine detection (#​2393, #​2398)
• Many test262 exclusions dropped: Unicode SpecialCasing, calendar arithmetic, PlainMonthDay, NumberFormat precision, Hebrew leap-month, era/year consistency, locale numbering, plus a precision-aware NumberFormat path and a new ICalendarProvider extension point (#​2390, #​2407, #​2409, #​2411, #​2414, #​2423)
• Acornima parser upgraded to 1.6.1 (#​2415)

Performance: Jint 4.8.0 → 4.9.0

Same machine, same scripts, default BenchmarkDotNet settings on the v4.8.0 and v4.9.0 tags. Lower is better. Negative deltas are improvements.

Hardware: AMD Ryzen 9 5950X · Windows 11 · .NET 10.0.7 · BenchmarkDotNet 0.15.8.

Cold path — Engine.Execute(string) (parses on every call)

Script	v4.8.0 Mean	v4.9.0 Mean	Δ Time	v4.8.0 Alloc	v4.9.0 Alloc	Δ Alloc
array-stress	4,532.5 µs	3,600.1 µs	−20.6%	7,375.95 KB	1,940.45 KB	−73.7%
dromaeo-object-array	29,904.0 µs	18,464.3 µs	−38.3%	96,765.24 KB	10,512.56 KB	−89.1%
dromaeo-object-array-modern	31,247.4 µs	17,622.9 µs	−43.6%	96,765.93 KB	10,513.07 KB	−89.1%
dromaeo-core-eval	2,723.9 µs	2,460.3 µs	−9.7%	1,342.64 KB	1,344.95 KB	+0.2%
dromaeo-object-regexp	140,426.3 µs	134,688.6 µs	−4.1%	164,829.32 KB	165,485.78 KB	+0.4%
dromaeo-string-base64-modern	35,122.2 µs	32,706.7 µs	−6.9%	3,780.89 KB	3,773.89 KB	−0.2%
stopwatch	213,814.7 µs	194,933.2 µs	−8.8%	72,704.98 KB	39,418.89 KB	−45.8%
stopwatch-modern	252,239.1 µs	237,843.5 µs	−5.7%	72,921.34 KB	39,635.13 KB	−45.6%

Cached path — Engine.Execute(Prepared<Script>) (parse once, reuse)

Script	v4.8.0 Mean	v4.9.0 Mean	Δ Time	v4.8.0 Alloc	v4.9.0 Alloc	Δ Alloc
array-stress	4,488.8 µs	3,668.5 µs	−18.3%	7,347.16 KB	1,911.66 KB	−74.0%
dromaeo-object-array	31,308.0 µs	17,237.0 µs	−45.0%	96,717.15 KB	10,464.17 KB	−89.2%
dromaeo-object-array-modern	33,145.1 µs	18,542.6 µs	−44.1%	96,718.78 KB	10,465.81 KB	−89.2%
dromaeo-object-regexp	111,053.6 µs	96,606.3 µs	−13.0%	162,817.15 KB	165,386.35 KB	+1.6%
dromaeo-object-regexp-modern	111,853.0 µs	103,489.0 µs	−7.5%	165,813.27 KB	165,159.68 KB	−0.4%
dromaeo-string-base64	28,926.7 µs	27,136.3 µs	−6.2%	3,682.73 KB	3,675.61 KB	−0.2%
stopwatch	215,316.7 µs	210,552.7 µs	−2.2%	72,673.29 KB	39,387.13 KB	−45.8%
stopwatch-modern	268,956.0 µs	250,468.4 µs	−6.9%	72,889.02 KB	39,602.85 KB	−45.7%

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What's Changed

• Optimize URI decode/unescape performance and memory usage by @​lahma in #​2389
• Update Test262Harness settings to remove unicode exclusions by @​lahma in #​2390
• Optimize custom regex engine interpreter performance by @​lahma in #​2388
• Regexp parsing cleanup by @​adams85 in #​2393
• Preserve JS function call signatures when functions are stored in Dictionary<string, object> by @​Copilot in #​2392
• Improve module system correctness and update test262 suite by @​lahma in #​2395
• Improve fallback to custom engine detection logic for regexps by @​adams85 in #​2398
• Bump GitHubActionsTestLogger and 3 others by @​dependabot[bot] in #​2397
• Improve Function.prototype.toString() to return source text for non-native functions by @​adams85 in #​2394
• Avoid double-evaluating assignment bases in member access by @​Copilot in #​2402
• Implement import defer and source phase imports proposals by @​lahma in #​2396
• Update README.md by @​adams85 in #​2404
• Bump the all-dependencies group with 4 updates by @​dependabot[bot] in #​2406
• Implement import text proposal by @​lahma in #​2403
• Drop test262 exclusions for cover-LHS naming, method toString, and Unicode SpecialCasing by @​lahma in #​2407
• Optimize Array.prototype.{sort,indexOf,includes,concat} and ArrayInstance.ConvertToSparse by @​lahma in #​2408
• Reduce test262 exclusions: PYM since/until, with(), calendarresolvefields, PMD monthCode, locale numbering by @​lahma in #​2409
• Drop Temporal/intl402 test262 exclusions: Hebrew leap-month, era/year consistency, PMD validation, plus cleanups by @​lahma in #​2411
• Use shape-versioned inline cache for member-expression reads by @​lahma in #​2412
• Pool FunctionEnvironment per JintFunctionDefinition.State by @​lahma in #​2413
• Upgrade to Acornima v1.6.1 by @​adams85 in #​2415
• Cache binding location in JintIdentifierExpression slot fast path by @​lahma in #​2416
• Document the (uint)i < (uint)length bounds-check idiom and apply it to four sites by @​lahma in #​2417
• Skip identifier walk through empty FunctionEnvironments by @​lahma in #​2419
• Inline small block-env slot reset by @​lahma in #​2420
• Source generator for built-in object registration by @​lahma in #​1076
• Reduce test262 exclusions across calendar arithmetic and PlainMonthDay by @​lahma in #​2414
• Source generator: expand to Boolean, Error, Number, Function, Object prototypes by @​lahma in #​2421
• Source generator: migrate Date, Array, String, RegExp prototypes by @​lahma in #​2422
• Reduce test262 exclusions: precision-aware NumberFormat + ICalendarProvider extension point by @​lahma in #​2423
• Source generator: migrate JSON, Reflect, Symbol, BigInt prototypes by @​lahma in #​2425
• Source generator: migrate Promise/WeakMap/WeakRef/FinalizationRegistry prototypes + Symbol/BigInt constructors by @​lahma in #​2426
• Source generator: migrate ArrayBuffer/SharedArrayBuffer/DataView prototypes by @​lahma in #​2433
• Source generator: add [JsSymbolAccessor] + migrate Proxy/ArrayBuffer/SharedArrayBuffer/Map constructors by @​lahma in #​2434
• Source generator: migrate Atomics + WeakSetPrototype + SetConstructor by @​lahma in #​2435
• Source generator: migrate Map + Set prototypes + IteratorPrototype family by @​lahma in #​2436
• Fix MissingMemberException on implicit string coercion of CLR objects by @​lahma in #​2439
• Source generator: finish rollout, spec-shaped signatures, strip redundant Length by @​lahma in #​2437
• Add option to prefer JS prototype methods over CLR on wrapped objects by @​lahma in #​2440
• Source generator: add [JsIntrinsicReference], migrate GlobalObject, cache Keys by @​lahma in #​2442
• Benchmarks: add 7 source-gen perf suites for Phase 2/3/4 follow-ups by @​lahma in #​2443
• Source generator + Math: variadic [Rest, ToX] + AggressiveInlining + slot elimination + selective [JsProperty] cache by @​lahma in #​2444
• Don't throw on missing dictionary keys with ThrowOnUnresolvedMember by @​lahma in #​2446
• Convert issue templates to YAML forms, add PR template and SECURITY.md by @​lahma in #​2447
• Support non-string CLR dictionary keys by @​lahma in #​2449
• Close perf regressions vs v4.8.0: recursion pool + JsString primitive read alloc by @​lahma in #​2450
• Bump the all-dependencies group with 7 updates by @​dependabot[bot] in #​2428
• Reduce Array allocations: lazy new Array(N) backing + Array.Copy fast path for shift/unshift/splice by @​lahma in #​2451
• Fix async for-of destructuring resume by @​nfcampos in #​2453
• Fix one-shot iterable head destructuring on async for-of body resume by @​lahma in #​2456
• Honor prepare-time RegexTimeout for custom-engine regex literals (#​2454) by @​lahma in #​2457
• JintIdentifierExpression: gate slot cache walk on engine identity by @​lahma in #​2458
• Bump the all-dependencies group with 6 updates by @​lahma in #​2460
• Bump Meziantou.Analyzer and YantraJS.Core by @​dependabot[bot] in #​2461
• Attach JS source location to CLR exceptions (#​2429) by @​lahma in #​2459

New Contributors

• @​nfcampos made their first contribution in #​2453

Full Changelog: sebastienros/jint@v4.8.0...v4.9.0

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