Malte UblandClaude Opus 5.5
c17eec0261
Once generic wrappers compile (#1413), the code behind them is reachable. This closes the general gaps found there: - performance.eventLoopUtilization() and monitorEventLoopDelay()'s IntervalHistogram (enable, disable, reset, percentile and the min, max, mean, stddev, count and exceeds readings), under the fallback declarations and @types/node. A new runtime unit, scr_perf_loop.c, links only for programs that read them (the perfLoop feature): an unref'd sampling interval records into HdrHistogram-shaped buckets, and utilization measures active time as the main thread's CPU time since the loop started. - Catch bindings narrowed by a user type predicate or an assertion read their members through the checked-dynamic value. - `??` with a function default of a different signature takes the optional callback's own function type and adapts the default. - Optional calls on interface-typed receivers dispatch like the plain protocol call. - `any` parameters of function declarations and spelled function types are checked-dynamic slots, and a generic instantiated at `any` takes `unknown` there. - `'key' in err` on Error receivers answers from the declaring subclasses. - Object.entries over a generic record resolves `keyof T extends never ? unknown : T[keyof T]` through the binding. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Node compatibility ledger
This workspace package owns scriptc's Node.js parity system.
node-v24.jsonpins the Node release tag, commit, and canonical docs/source inputs.static-support.jsonoverlays dedicated compiler paths and their internal test evidence on the compiler's generated surface manifest.generated/node-v24-internal.jsonis the engineering ledger, including implementation evidence and repository test paths.generated/node-v24-backlog.jsonis the internal tier-specific work queue. It separates verification, implementation, explicit-refusal replacement, and partial-surface audit work, and prioritizes stable Node APIs above experimental, deprecated, and legacy APIs.docs/src/generated/node-v24-compatibility.jsonis the stripped public artifact consumed by the docs website. It contains compiler-relevant runtime APIs, statuses, verification bases, and user-facing details; documentation, metadata, command-line/configuration entries, and rows that are N/A for native execution remain internal.
Statuses are evidence-aware: supported and partial require test evidence; refused requires an explicit compiler diagnostic or native throwing stub; not-implemented is the actionable backlog for an owned API family with no implementation match; by-design records an architectural exclusion; unreviewed still needs classification; and not-applicable is not a runtime API for that execution tier.
Run pnpm node-compat:backlog from the repository root for a summary. The filters --tier, --action, --priority, --chapter, and --status compose; use --format=json or --format=tsv for tooling.
Run pnpm node-compat from the repository root after changing the Node pin or the support manifest. pnpm node-compat:check is the offline drift/evidence gate; pnpm --filter @internal/compatibility check:upstream additionally verifies the pinned upstream inputs over the network.