Node.js 25.9.0 (Current) has been released with several notable changes. The test runner's module mocking API has been consolidated: `MockModuleOptions.defaultExport` and `MockModuleOptions.namedExports` are merged into a single `MockModuleOptions.exports` option, with an automated codemod migration available. Other semver-minor additions include `using` scopes for `AsyncLocalStorage`, a new `--max-heap-size` CLI flag, TurboSHAKE and KangarooTwelve Web Cryptography algorithms, customizable REPL error handling, removal of the `node:domain` dependency from REPL, ESM code cache support in Single Executable Applications (SEA), and a new `stream/iter` implementation. Additional fixes cover zlib use-after-free, ESM path normalization, Buffer performance improvements, and various dependency updates including npm 11.12.1 and SQLite 3.51.3.
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