node:vfs lands as a new experimental builtin (
c9562dd)
Node.js adds a minimal node:vfs subsystem with an in-memory virtual file system and provider classes, plus a new --experimental-vfs flag. This is a substantial new API surface aimed at tests, fixtures, embedded assets, and other self-contained filesystem use cases.
WebCrypto is refactored into native job flows and hardened against prototype pollution (
e24e698, b8fc182, 0cabd66, dfe2d47)
WebCrypto methods were reworked to remove async wrappers, route synchronous validation through a shared promise helper, and move more of the work into native CryptoJob paths. The changes also reduce secret material copies for KDFs, pass CryptoKey handles directly into native jobs, and add protections against prototype pollution and species/thenable trickery when resolving WebCrypto promises.
Streams/iter fixes tighten cancellation, backpressure, and flush behavior (
8d3245e, a7d5446, 837910d)
The stream iterator adapters now better handle backpressure without duplicating writes, preserve abort reasons for share/broadcast, and ensure fused stateless transforms receive their final flush correctly. These fixes target observable correctness issues in the experimental stream iterator APIs.
Test runner coverage can now start after bootstrap (
c9dbb86)
The test runner now exposes a new internal profiler entrypoint to start V8 precise coverage after bootstrap, which helps coverage work in isolation-aware setups. This also avoids crashing the parent process in --test --test-isolation=process scenarios where workers own coverage collection.
Other misc changes
- Docs cleanup for
modules.mdspacing (
985b608) - Small test/doc updates around the new coverage and stream behavior