Here's an initial stab at better process support.

For process.versions, we just include the node version maintained through a header file that will need to be manually updated. I included the version information for node, v8, icu, ada, brotli, simdutf, sqlite, nbytes, ncrypto as part of the Bazel build process. This exposes internal implementation details which might be considered a security risk. This is also what all Node-like platforms do.

We can discuss restricting this list down to just node and v8 or even just node. process.versions.node is a common compat check though so it's worth bearing that one in mind at least. Happy to remove, not tied to the implementation at all, would value feedback here.

Included Features

Properties:

• process.platform - Returns OS platform (before returned darwin/linux/win32, now always returns linux)
• process.arch - System architecture (always returns x64)
• process.version - Node.js version string, hard coded in a header file, and will need to be updated to the running latest stable release as appropriate.
• process.versions - Version info for node matching process.version
• process.title - Process title (hardcoded to "workerd")
• process.features - Feature flags object (as previously)
• process.argv - Command line arguments array (hardcoded to ["workerd"])
• process.argv0 - First argument (hardcoded to "workerd")
• process.execArgv - Node.js specific arguments (empty array)
• process.pid - Process ID (hardcoded to 1)
• process.ppid - Parent process ID (hardcoded to 0)
• process.release - Node.js release metadata, hardcoded to Node.js default (this is what Bun & Deno do, open to leaving this out as well) (removed)
• process.config - Build configuration object (empty but just has properties for checking per Node compat)
• process.allowedNodeEnvironmentFlags - Empty Set for environment flags

Methods:

• process.getegid/geteuid/getgid/getuid() - Get effective group/user ID (returns 0)
• process.setegid/seteuid/setgid/setuid() - Set effective group/user ID permission error
• process.setgroups, getgroups() - permission error
• process.initgroups - permission error
• process.setSourceMapsEnabled() - Enable source maps (no-op)
• process.getSourceMapsSupport() - returning false for all properties
• process.kill - throws unsupported
• process.ref - throws unsupported
• process.unref = throws unsupported
• process.uptime - returning 0 currently, may update to be request time based
• process.hrtime - returns the same time as Date.now()
• process.hrtime.bigint - bigint variation of process.hrtime
• process.uptime - always returns 0
• process.emitWarning and process now extends event emitter with "on" support, enabled the former util test.
• kill() - throws unsupported
• exit() - as previously implemented
• abort() - as exit(0)

Events

• warning on process.emitWarning
• rejectionHandled per the current global event
• unhandledRejection per the current global event

Follow-on Features

The following features will be implemented as follow-ons:

• process.umask - Added as unsupported pending FS work
• process.chdir - Added as unsupported pending FS work
• process.cwd - Added as unsupported pending FS work
• stderr / stdin / stdout - to implement as follow-up

Excluded Features

The following features are still entirely omitted and only exported as undefined:

• exitCode
• channel
• connected
• binding()
• debugPort - possible for follow-up, would need to track debug port configuration
• dlopen()
• finalization
• getActiveResourcesInfo()
• setUncaughtExceptionCaptureCallback()
• hasUncaughtExceptionCaptureCallback()
• memoryUsage()
• noDeprecation
• permission
• release - deemed unnecessary
• report
• resourceUsage()
• send()
• traceDeprecation - undefined unless set anyway
• throwDeprecation - undefined unless set anyway
• sourceMapsEnabled - experimental and already deprecated, so skipped
• threadCpuUsage() - added after Node.js 20
• Events: beforeExit, disconnect, exit, message, multipleResolves, workerMessage, uncaughtException, uncaughtExceptionMonitor, worker