It’s been 2 months since the new version of Node.js 21 was released. Node.js 21 include updates of the V8 JavaScript engine to 11.8, stable fetch and WebStreams, a new experimental flag to flip module defaults (--experimental-default-type), a built-in WebSocket client & many updates to test runner.

With the latest Node.js update, the test runner introduces support for glob expressions when specifying the --test parameter. This means you can now use powerful glob patterns to run tests more efficiently and flexibly. The new flag --experimental-default-type can be used to flip the default module system used by Node.js. Input that is already explicitly defined as ES modules or CommonJS, such as by a package.json "type" field or .mjs/.cjs file extension or the --input-type flag, is unaffected.