Changelog

nodejs/node · · 3 commits

Buffer speeds up, test mocks evolve

Buffer gets several performance wins, while test runner module mocks gain a new exports option and deprecate older shapes.

thisalihassan Han5991

Buffer operations get faster across the board (thisalihassan9e0dc8b)

Node’s Buffer implementation was optimized in several hot paths: copyBytesFrom() now computes offsets directly, toString('hex') uses V8’s Uint8Array.prototype.toHex() builtin, fill() adds a single-character ASCII fast path, indexOf() avoids extra work for ASCII, and swap16/32/64 gain V8 Fast API support. This should reduce overhead in common Buffer-heavy code and improve throughput for string/byte manipulation.

test_runner module mocks add a new exports API (Han59917d1f1b4)

mock.module() now accepts an exports option, which becomes the preferred way to define default and named exports for mocked modules. The old defaultExport and namedExports options are kept as aliases but now emit runtime deprecation warnings, tightening the API while preserving compatibility.

Other misc changes

  • Dependency bump in tools/doc for picomatch (1 commit)