Module loader hooks now run in a worker, with --experimental-loader support (
5aaeb48)
Deno reworks module.register() to use a dedicated worker thread, matching Node’s hooks-thread model and avoiding deadlocks from hook-module self-imports. It also adds hidden --experimental-loader/--loader flag plumbing so custom loaders can be passed through in Node-compat mode.
require() now throws the right Node.js errors for async ESM and CJS/ESM cycles (ffbc071)
This adds ERR_REQUIRE_ASYNC_MODULE when require() hits top-level await, and ERR_REQUIRE_CYCLE_MODULE when it encounters an ESM module in a CommonJS cycle. That makes failure modes clearer and much closer to Node’s actual behavior instead of returning partial exports or the wrong generic error.
Node’s testing polyfill gets broader node:test compatibility (
4be99ff)
The test runner now fills in missing default-export functions, fixes globalThis leaking into mock functions, and adds support for module-level hooks. The change unlocks several additional Node compat tests and closes a known node:test gap.
node:tls certificate validation is fixed by upgrading rustls (aefa735)
A rustls bump resolves a regression where fetch() could fail against servers using certain certificate/signature combinations. This restores TLS handshake compatibility for affected servers rather than breaking on a newer rustls-webpki error path.
Major Node polyfills are being moved to lazy-loaded JS (e69a05d, 8660edf, d9f981f, e68f30d)
Several high-traffic internals, including child_process, cluster, console, path, crypto, and more fs helpers, were converted from eagerly loaded ESM into lazy-loaded scripts. The main payoff is lower startup overhead and better dependency ordering, which also unblocks further polyfill conversion work.
importing Node builtins after register() no longer panics (0f19a26)
Internal ext: specifiers are now treated as already resolved, so built-in modules don’t get routed through user hooks during synchronous instantiation. That fixes a crash when importing node: builtins after module hooks are active.
Other misc changes
- Dependency bumps / lockfile updates (1 commit)
- Minor module registration test updates (1 commit)