SharpTS Node.js Module Support Status

June 20, 2026 · View on GitHub

This document tracks Node.js module and API implementation status in SharpTS.

Last Updated: 2026-04-07 (Web Streams API — node:stream/web and globals: ReadableStream, WritableStream, TransformStream, queuing strategies, both interpreter and compiled modes)

Legend

  • ✅ Implemented
  • ⚠️ Partially Implemented
  • ❌ Not Implemented

1. CORE NODE.JS MODULES

ModuleStatusNotes
fs✅Sync, callback-based async, and fs.promises APIs
path✅Full API
os✅Full API
process✅Properties + methods, available as module and global
crypto✅Hash, HMAC, Cipher, PBKDF2, scrypt, HKDF (sync + async callback), RSA encrypt/decrypt, Sign/Verify, DH/ECDH, KeyPair (sync + async), KeyObject
url✅WHATWG URL + legacy parse/format/resolve
querystring✅parse, stringify, escape, unescape
assert✅Full testing utilities
child_process✅execSync, spawnSync, exec, spawn, execFileSync, execFile, fork (IPC via named pipes); ChildProcess EventEmitter with kill, send, disconnect, stdin
util✅format, inspect, isDeepStrictEqual, parseArgs, toUSVString, stripVTControlCharacters, getSystemErrorName, getSystemErrorMap, promisify, types helpers, deprecate, callbackify, inherits, TextEncoder/TextDecoder
console✅log, error, warn, info, debug, clear, time/timeEnd/timeLog, assert, count/countReset, table, dir, group/groupEnd, trace
readline✅questionSync, createInterface (extends EventEmitter), question, close, prompt, pause, resume, write, setPrompt, getPrompt
events✅EventEmitter with on/off/once/emit/removeListener
stream✅Readable, Writable, Duplex, Transform, PassThrough (sync mode)
stream/web✅WHATWG Streams: ReadableStream, WritableStream, TransformStream, ByteLengthQueuingStrategy, CountQueuingStrategy. See Section 19.
buffer✅Full Buffer class with multi-byte LE/BE, float/double, BigInt, search, swap
timers✅setTimeout, setInterval, setImmediate + clear variants (module import)
timers/promises✅Promise-based setTimeout/setImmediate (with AbortSignal), AsyncIterable setInterval
string_decoder✅StringDecoder class for multi-byte character handling
perf_hooks✅performance.now(), timeOrigin, mark(), measure(), getEntries/ByName/ByType(), clearMarks/Measures(); PerformanceObserver
http / https✅createServer, request, get; IncomingMessage extends Readable; ServerResponse extends Writable; full event lifecycle
net✅createServer, createConnection/connect, Socket, Server; isIP, isIPv4, isIPv6
tls✅createServer, connect, createSecureContext, TLSSocket, Server; DEFAULT_MIN_VERSION, DEFAULT_MAX_VERSION; ALPNProtocols, SNICallback, servername; secureConnect/secureConnection/tlsClientError events
dns✅lookup, lookupService, resolve, resolve4, resolve6, reverse, resolveMx, resolveTxt, resolveSrv, resolveCname, resolveNs, resolveSoa, resolvePtr, resolveCaa, resolveNaptr (callback + dns/promises)
zlib✅gzip, deflate, deflateRaw, brotli, zstd (sync + streaming + async callback APIs)
worker_threads⚠️Worker, MessageChannel, parentPort, workerData, isMainThread
dgram✅createSocket, Socket; bind, send, close, address, setBroadcast, setTTL, addMembership, dropMembership; connect, disconnect, remoteAddress, get/setRecvBufferSize, get/setSendBufferSize; message/listening/close/error/connect events
cluster✅isPrimary/isWorker/isMaster, fork, worker.send/disconnect/kill/isDead/isConnected, process.send (IPC), cluster events (fork/online/disconnect/exit/message), cluster.disconnect, setupPrimary, workers dict
vm✅runInNewContext, runInThisContext, createContext, isContext, compileFunction, Script class
async_hooks✅AsyncLocalStorage: run, getStore, enterWith, exit, disable; async context propagation via .NET AsyncLocal

2. FILE SYSTEM (fs)

FeatureStatusNotes
File Operations
existsSync✅
readFileSync✅Supports encoding option
writeFileSync✅
appendFileSync✅
copyFileSync✅
renameSync✅
unlinkSync✅
truncateSync✅Truncate file to specified length
Directory Operations
mkdirSync✅Supports recursive option
rmdirSync✅
readdirSync✅Supports recursive and withFileTypes options
mkdtempSync✅Create unique temp directory
opendirSync✅Returns Dir object with readSync/closeSync
File Info
statSync✅Returns Stats object
lstatSync✅Stats without following symlinks
accessSync✅Check file access permissions
realpathSync✅Resolve canonical path
File Descriptor APIs
openSync✅Open file, returns fd (flags: r, w, a, r+, w+, a+, etc.)
closeSync✅Close file descriptor
readSync✅Read into Buffer at offset/position
writeSync✅Write Buffer or string to fd
fstatSync✅Stats for open file descriptor
ftruncateSync✅Truncate open file descriptor
Links
linkSync✅Create hard link (cross-platform)
symlinkSync✅Create symbolic link
readlinkSync✅Read symbolic link target
Permissions
chmodSync✅Change file mode/permissions
chownSync✅Change file owner (Unix only)
lchownSync✅Change symlink owner (Unix only)
utimesSync✅Update file access/modification times
Async APIs (Callback)
readFile✅Callback-based async
writeFile✅Callback-based async
appendFile✅Callback-based async
stat / lstat✅Callback-based async
unlink✅Callback-based async
mkdir / rmdir✅Callback-based async
readdir✅Callback-based async
rename / copyFile✅Callback-based async
access / chmod✅Callback-based async
truncate / utimes✅Callback-based async
readlink / realpath✅Callback-based async
symlink / link✅Callback-based async
mkdtemp✅Callback-based async
Promise APIs (fs/promises)
fs/promises✅Full promise-based API (also via fs.promises)
Advanced
createReadStream✅Returns Readable stream with data, end, error events
createWriteStream✅Returns Writable stream with finish, error events
watch✅Returns FSWatcher (EventEmitter) with change, rename, error, close events; supports recursive option
watchFile✅Polling-based file watching with (current, previous) Stats callback; supports interval option
unwatchFile✅Stop watching a file previously started with watchFile
Error Codes✅ENOENT, EACCES, EEXIST, EISDIR, ENOTDIR, ENOTEMPTY, EBADF, EXDEV, etc.

3. PATH (path)

FeatureStatusNotes
join✅
resolve✅
basename✅
dirname✅
extname✅
normalize✅
isAbsolute✅
relative✅
parse✅Returns { root, dir, base, ext, name }
format✅
sep✅Platform path separator
delimiter✅Platform path list delimiter
posix✅POSIX-style path methods (always uses /)
win32✅Windows-style path methods (always uses \)

4. OS (os)

FeatureStatusNotes
platform✅
arch✅
hostname✅
homedir✅
tmpdir✅
type✅
release✅
cpus✅Returns CPU info array
totalmem✅
freemem✅
userInfo✅
EOL✅Platform line ending
networkInterfaces✅Returns network interface information
loadavg✅Returns [0, 0, 0] on Windows (Node.js behavior)

5. PROCESS

FeatureStatusNotes
Properties
platform✅
arch✅
pid✅
version✅
env✅Environment variables
argv✅Command-line arguments
exitCode✅
stdin✅Basic input support
stdout✅write() method
stderr✅write() method
Methods
cwd✅
chdir✅
exit✅
hrtime✅High-resolution time
uptime✅
memoryUsage✅
nextTick✅Schedules callback (implemented via timer)
Events
on('exit')✅Process extends EventEmitter; exit event emitted before process.exit()
on('uncaughtException')✅Process extends EventEmitter; uncaughtException event support
on(event, listener)✅Full EventEmitter API (on, once, off, emit, removeAllListeners, etc.)

6. CRYPTO

FeatureStatusNotes
Hashing
createHash✅md5, sha1, sha256, sha384, sha512
createHmac✅md5, sha1, sha256, sha384, sha512 with string/Buffer keys
Random
randomBytes✅
randomFillSync✅Fill buffer with random bytes in-place
randomUUID✅
randomInt✅
Cipher
createCipheriv✅AES-128/192/256-CBC and AES-128/192/256-GCM
createDecipheriv✅AES-128/192/256-CBC and AES-128/192/256-GCM
createCipher / createDecipher❌Deprecated in Node.js, use iv variants
Key Derivation
pbkdf2Sync✅sha1, sha256, sha384, sha512 (not md5)
scryptSync✅With N/cost, r/blockSize, p/parallelization options
pbkdf2 / scrypt✅Async callback-based versions with event loop integration
Comparison
timingSafeEqual✅Constant-time buffer comparison (prevents timing attacks)
Signing
createSign / createVerify✅RSA and EC keys; SHA1/256/384/512; hex/base64/Buffer output
Key Generation
generateKeyPairSync✅RSA (2048/4096) and EC (P-256/P-384/P-521); PEM format
generateKeyPair✅Async callback-based version with (err, publicKey, privateKey) signature
Diffie-Hellman
createDiffieHellman✅With prime length or explicit prime/generator
getDiffieHellman✅Predefined groups: modp1, modp2, modp5, modp14-18
createECDH✅P-256 (prime256v1), P-384 (secp384r1), P-521 (secp521r1)
Discovery
getHashes✅Returns array of supported hash algorithms
getCiphers✅Returns array of supported cipher algorithms
RSA Encryption
publicEncrypt✅RSA-OAEP encryption (SHA-1 default)
privateDecrypt✅RSA-OAEP decryption
privateEncrypt✅RSA PKCS#1 v1.5 signing primitive
publicDecrypt✅RSA PKCS#1 v1.5 verification primitive
HKDF
hkdfSync✅HKDF key derivation (RFC 5869); sha256, sha384, sha512
hkdf✅Async callback-based version with event loop integration
KeyObject
createSecretKey✅Create symmetric KeyObject from Buffer
createPublicKey✅Create public KeyObject from PEM
createPrivateKey✅Create private KeyObject from PEM
KeyObject.type✅'secret', 'public', or 'private'
KeyObject.asymmetricKeyType✅'rsa' or 'ec' (undefined for secret)
KeyObject.asymmetricKeyDetails✅modulusLength/publicExponent for RSA, namedCurve for EC
KeyObject.symmetricKeySize✅Byte length (secret keys only)
KeyObject.export()✅Export to PEM string or Buffer

7. URL

FeatureStatusNotes
WHATWG URL API
URL class✅Full property access
URLSearchParams✅get, set, has, append, delete, keys, values, size
Legacy API
parse✅
format✅
resolve✅

8. CHILD PROCESS

FeatureStatusNotes
Sync Methods
execSync✅With cwd, timeout, env, shell options
spawnSync✅With cwd, timeout, env options
execFileSync✅Execute file directly (no shell); with cwd, timeout, env
Async Methods
exec✅Async with callback(error, stdout, stderr); returns ChildProcess EventEmitter
spawn✅Async; returns ChildProcess with stdout/stderr/stdin streams and events
execFile✅Execute file directly (no shell); async with callback; returns ChildProcess
fork✅Spawns new SharpTS process with IPC channel via named pipes; parent/child send/on('message')
ChildProcess
pid✅Process ID
exitCode✅Exit code (null until exit)
killed✅Whether process was killed
stdout / stderr✅Readable streams (spawn/fork)
stdin✅Writable stream (spawn)
kill(signal?)✅Actually kills the process (with entireProcessTree)
send(message)✅IPC messaging (fork only)
disconnect()✅Close IPC channel (fork only)
connected✅IPC connection status (fork only)
on/once/off✅EventEmitter: close, exit, error, message, disconnect events
ref() / unref()✅Event loop ref counting (basic)

9. UTIL

FeatureStatusNotes
Formatting
format()✅Placeholders: %s, %d, %i, %f, %j, %o, %O, %%
inspect()✅Object stringification with depth option
stripVTControlCharacters()✅Remove ANSI escape sequences
Comparison
isDeepStrictEqual()✅Deep equality (NaN equals NaN)
CLI Parsing
parseArgs()✅Boolean/string options, short/long flags, negation
String Utilities
toUSVString()✅Replace lone surrogates with replacement char
System Errors
getSystemErrorName()✅POSIX errno to name (70+ codes)
getSystemErrorMap()✅Map of errno to [name, description]
Function Utilities
deprecate()✅Wrap function with deprecation warning
callbackify()✅Convert Promise function to callback style
inherits()✅Set up prototype chain (sets super_)
TextEncoder
new TextEncoder()✅UTF-8 encoder
encode()✅String to Uint8Array
encodeInto()✅Encode into existing buffer
TextDecoder
new TextDecoder()✅Supports utf-8, latin1, utf-16le
decode()✅Buffer to string
util.types
types.isArray()✅Array check
types.isDate()✅Date check
types.isFunction()✅Function check
types.isNull()✅Null check (not undefined)
types.isUndefined()✅Undefined check (not null)
types.isPromise()✅Promise check
types.isRegExp()✅RegExp check
types.isMap()✅Map check
types.isSet()✅Set check
types.isTypedArray()✅Buffer/TypedArray check
types.isNativeError()✅Error check
types.isBoxedPrimitive()✅Always false (no boxed primitives)
types.isWeakMap()✅WeakMap check
types.isWeakSet()✅WeakSet check
types.isArrayBuffer()✅ArrayBuffer check
Async/Promisify
promisify()✅Converts callback-style to Promise-returning

10. MODULE SYSTEM

FeatureStatusNotes
ES Modules
import { x } from './file'✅Named imports
import x from './file'✅Default imports
import * as x from './file'✅Namespace imports
export { x }✅Named exports
export default x✅Default exports
export * from './file'✅Re-exports
import type { T }✅Type-only imports
import('./file')✅Dynamic imports
import.meta.url✅Module URL (file:// format)
import.meta.dirname✅Directory of current module
import.meta.filename✅Full path of current module
CommonJS Interop
import x = require('path')✅CommonJS import syntax
export =✅CommonJS export syntax
require() function✅Both interpreter and compiled modes. Loads .cjs/.js files, follows package.json type field, supports circular requires with partial exports, throws MODULE_NOT_FOUND on missing modules (catchable via try/catch). Compiled mode requires string-literal specifiers — non-literals are a SHARPTS_CJS001 compile error.
module.exports✅Both modes. module.exports = X and exports.foo = X patterns supported. Reassignment semantics match Node. Compiled mode lowers module.exports/exports to direct static field accesses on the per-file $Module_X class.
exports shorthand✅Both modes.
ESM imports CJS✅import x from './file.cjs', named imports, and namespace imports all work; CJS exports are typed as any.
.cjs extension✅Always treated as CommonJS regardless of nearest package.json.
.mjs extension✅Always treated as ES module.
package.json type field✅"module" → ESM, "commonjs" or absent → CJS for .js files.
Resolution
Relative paths✅./foo, ../bar
Bare specifiers✅node_modules lookup
Directory index✅Looks for index.ts
Extension inference✅Adds .ts automatically
Circular detection✅With error reporting
/// <reference>✅Triple-slash references
package.json exports✅Subpath exports, wildcard patterns, main/types/typings fallback, .js→.ts extension mapping
Conditional exports✅Conditions: types, import, default; nested conditions; array fallbacks; null restrictions
Subpath imports (#)✅"imports" field in package.json with #-prefixed specifiers
Self-referencing✅Package imports itself by name through its own exports
Scoped packages✅@scope/pkg and @scope/pkg/subpath resolution

11. GLOBALS

FeatureStatusNotes
globalThis✅ES2020 global reference
process✅Available globally
console✅console.log and variants
setTimeout / clearTimeout✅
setInterval / clearInterval✅
__dirname✅Directory of current module
__filename✅Full path of current module
require✅Available globally in both interpreter and compiled modes. Compiled mode requires string-literal specifiers (non-literals are a compile error).
module✅Per-module CJS binding (matches Node — not on globalThis). Interpreter binds in module scope; compiled mode lowers module.exports to the per-file $Module_X.exports static field.
exports✅Per-module CJS binding (matches Node — not on globalThis). Same lowering as module.exports in compiled mode.
Buffer✅Full Buffer class available globally
global⚠️Use globalThis

12. STREAMS

FeatureStatusNotes
Readable
new Readable()✅Constructor with options
push(chunk)✅Add data to buffer; null signals EOF
read()✅Read from buffer
pipe(dest)✅Pipe to Writable/Duplex, returns destination
unpipe(dest)✅Remove pipe destination
readable✅Property: stream is readable
readableEnded✅Property: EOF reached
readableLength✅Property: buffer size
'end' event✅Emitted when EOF reached
Writable
new Writable()✅Constructor with write callback option
write(chunk)✅Write data, invokes write callback
end()✅Signal end of writes
cork() / uncork()✅Buffer writes
writable✅Property: stream is writable
writableEnded✅Property: end() called
writableFinished✅Property: all data flushed
'finish' event✅Emitted when all writes complete
Duplex
new Duplex()✅Readable + Writable combined
All Readable methods✅Inherited
All Writable methods✅Added
Transform
new Transform()✅Constructor with transform callback
transform(chunk, enc, cb)✅Transform callback; cb(null, data) pushes
All Duplex methods✅Inherited
PassThrough
new PassThrough()✅Transform that passes data unchanged
Process Streams
process.stdout✅Full Writable stream: write(), end(), cork(), uncork(), on/once/off events, writable/writableEnded/writableFinished properties, isTTY
process.stderr✅Full Writable stream: write(), end(), cork(), uncork(), on/once/off events, writable/writableEnded/writableFinished properties, isTTY
process.stdin✅Full Readable stream: on('data'), on('end'), read(), pause(), resume(), pipe(), setEncoding(), readable/readableEnded properties, isTTY; background Console.In reader thread
Flowing Mode
Auto-flowing on data listener✅Enters flowing mode when 'data' listener added
pause() / resume()✅Flow control with buffer draining on resume
readableFlowing property✅null/false/true states
Pipe backpressure✅Pauses source on writable backpressure, resumes on drain
Object Mode
Object mode✅objectMode: true option; streams accept any JS value (both interpreter and compiled modes)
readableObjectMode✅Property: whether readable side is in object mode
writableObjectMode✅Property: whether writable side is in object mode
Not Implemented
highWaterMark enforcement✅push() returns false at threshold; write() byte-based backpressure; pipe pauses/resumes on drain

13. EVENTS

FeatureStatusNotes
EventEmitter class✅Full implementation
on() / addListener()✅
once()✅
emit()✅
removeListener() / off()✅
removeAllListeners()✅
listenerCount()✅
listeners()✅
eventNames()✅
prependListener()✅
prependOnceListener()✅
defaultMaxListeners✅Static property

14. ZLIB (Compression)

FeatureStatusNotes
Gzip
gzipSync✅Compress using gzip
gunzipSync✅Decompress gzip data
Deflate
deflateSync✅Compress with zlib header
inflateSync✅Decompress zlib data
deflateRawSync✅Compress without header
inflateRawSync✅Decompress raw deflate
Brotli
brotliCompressSync✅Brotli compression
brotliDecompressSync✅Brotli decompression
Zstd
zstdCompressSync✅Zstandard compression
zstdDecompressSync✅Zstandard decompression
Utilities
unzipSync✅Auto-detect and decompress
constants✅Compression constants object
Options
level✅Compression level (0-9)
chunkSize✅Buffer size for streaming
maxOutputLength✅Maximum output size limit
windowBits⚠️Not directly supported in .NET
memLevel⚠️Not directly supported in .NET
strategy⚠️Not directly supported in .NET
Async Callback APIs
gzip / gunzip✅Callback-based async (interpreter mode)
deflate / inflate✅Callback-based async (interpreter mode)
deflateRaw / inflateRaw✅Callback-based async (interpreter mode)
brotliCompress / brotliDecompress✅Callback-based async (interpreter mode)
unzip✅Callback-based async with auto-detect (interpreter mode)
Streaming APIs (Transform)
createGzip / createGunzip✅Returns Transform stream; true streaming compression, accumulate-then-decompress
createDeflate / createInflate✅Returns Transform stream; zlib header format
createDeflateRaw / createInflateRaw✅Returns Transform stream; raw deflate format
createBrotliCompress / createBrotliDecompress✅Returns Transform stream; Brotli format
createUnzip✅Returns Transform stream; auto-detects gzip/deflate/raw

15. TIMERS

FeatureStatusNotes
Timeout
setTimeout()✅Schedule callback after delay
clearTimeout()✅Cancel scheduled timeout
Interval
setInterval()✅Schedule repeating callback
clearInterval()✅Cancel interval
Immediate
setImmediate()✅Schedule callback for next tick
clearImmediate()✅Cancel immediate
Module Import
import { setTimeout } from 'timers'✅Named imports
import * as timers from 'timers'✅Namespace import

16. TIMERS/PROMISES

FeatureStatusNotes
Import
import { setTimeout } from 'timers/promises'✅Named import
import * as timers from 'timers/promises'✅Namespace import
import { setTimeout } from 'node:timers/promises'✅Node prefix import
Methods
setTimeout(delay?, value?, options?)✅Returns Promise<T> that resolves with value after delay ms; supports options.signal
setImmediate(value?, options?)✅Returns Promise<T> that resolves with value immediately; supports options.signal
setInterval(delay?, value?, options?)✅Returns an async iterable for for await...of; supports options.signal (interpreter mode)
AbortSignal Support
setTimeout with options.signal✅Throws AbortError on pre-aborted signal or mid-delay abort (both modes)
setImmediate with options.signal✅Throws AbortError on pre-aborted signal (both modes)
setInterval with options.signal✅Throws AbortError on pre-abort; iterator ends cleanly on mid-iteration abort (both modes)
Not Implemented
options.ref❌Timer ref/unref control
scheduler.wait() / scheduler.yield()❌Scheduler API

17. STRING_DECODER

FeatureStatusNotes
Constructor
new StringDecoder()✅Default encoding: utf8
new StringDecoder(encoding)✅utf8, utf-8, utf16le, ucs2, latin1, ascii
Methods
write(buffer)✅Decode buffer, handle partial sequences
end()✅Flush remaining bytes
end(buffer)✅Write final buffer and flush
Properties
encoding✅Returns normalized encoding name
Multi-byte Handling
UTF-8 sequences✅Properly buffers incomplete sequences
UTF-16LE pairs✅Handles byte alignment

17. PERF_HOOKS

FeatureStatusNotes
performance
performance.now()✅High-resolution monotonic timestamp
performance.timeOrigin✅Unix timestamp when process started
performance.mark(name, options?)✅Creates PerformanceMark entry; options.startTime supported
performance.measure(name, start?, end?)✅Creates PerformanceMeasure between marks
performance.getEntries()✅Returns all performance entries
performance.getEntriesByName(name, type?)✅Filter entries by name, optionally by type
performance.getEntriesByType(type)✅Filter entries by 'mark' or 'measure'
performance.clearMarks(name?)✅Clear all marks or by name
performance.clearMeasures(name?)✅Clear all measures or by name
PerformanceObserver
new PerformanceObserver(callback)✅Create observer with callback
observer.observe({ entryTypes })✅Start observing specified entry types
observer.disconnect()✅Stop receiving notifications
Import
import { performance } from 'perf_hooks'✅Named import
import { PerformanceObserver } from 'perf_hooks'✅Named import
import * as perf from 'perf_hooks'✅Namespace import

18. BUFFER

FeatureStatusNotes
Static Methods
Buffer.from()✅From string, array, or Buffer
Buffer.alloc()✅Zero-filled allocation
Buffer.allocUnsafe()✅Uninitialized allocation
Buffer.concat()✅Concatenate multiple buffers
Buffer.isBuffer()✅Type check
Buffer.byteLength()✅String byte length
Buffer.compare()✅Static comparison
Buffer.isEncoding()✅Encoding validation
Instance Properties
length✅Buffer byte length
Instance Methods
toString()✅With encoding support
slice()✅Create view/copy
copy()✅Copy to target buffer
compare()✅Compare with other buffer
equals()✅Equality check
fill()✅Fill with value/string
write()✅Write string at offset
readUInt8()✅Read unsigned byte
writeUInt8()✅Write unsigned byte
toJSON()✅Serialize to {type, data}
Multi-byte Reads
readUInt16LE/BE()✅Unsigned 16-bit
readUInt32LE/BE()✅Unsigned 32-bit
readInt8()✅Signed 8-bit
readInt16LE/BE()✅Signed 16-bit
readInt32LE/BE()✅Signed 32-bit
readBigInt64LE/BE()✅Signed 64-bit BigInt
readBigUInt64LE/BE()✅Unsigned 64-bit BigInt
readFloatLE/BE()✅32-bit float
readDoubleLE/BE()✅64-bit double
Multi-byte Writes
writeUInt16LE/BE()✅Unsigned 16-bit
writeUInt32LE/BE()✅Unsigned 32-bit
writeInt8()✅Signed 8-bit
writeInt16LE/BE()✅Signed 16-bit
writeInt32LE/BE()✅Signed 32-bit
writeBigInt64LE/BE()✅Signed 64-bit BigInt
writeBigUInt64LE/BE()✅Unsigned 64-bit BigInt
writeFloatLE/BE()✅32-bit float
writeDoubleLE/BE()✅64-bit double
Search & Swap
indexOf()✅Find first occurrence
includes()✅Check if value exists
swap16/32/64()✅Byte order swapping

19. WEB APIs

FeatureStatusNotes
fetch()
fetch(url)✅Basic GET request
fetch(url, options)✅With request configuration
Request Options
method✅GET, POST, PUT, DELETE, PATCH, etc.
headers✅Custom request headers as object
body✅String request body
Response Object
status✅HTTP status code
statusText✅HTTP status message
ok✅True if status 200-299
url✅Final URL after redirects
headers✅Response headers as object
Response Methods
json()✅Parse body as JSON (returns Promise)
text()✅Get body as string (returns Promise)
arrayBuffer()✅Get body as ArrayBuffer (returns Promise)
Async Support
await fetch(...)✅Full async/await support
Promise chaining✅.then() style
response.body✅Readable stream (body eagerly loaded, streamed via Readable)
Headers class✅Constructable new Headers(init?) with get/set/has/delete/append/forEach/entries/keys/values
AbortController / signal option✅new AbortController(), signal.aborted, abort(reason?), throwIfAborted(), AbortSignal.abort()/timeout()/any(); fetch signal option with pre-abort check and cancellation
Not Implemented
Request class✅new Request(url, init?) with method, headers, body, clone(); json(), text(), arrayBuffer()
Response class✅new Response(body?, init?) with status, statusText, ok, headers, clone(); json(), text(), arrayBuffer(); static json(), redirect(), error()
credentials option✅'omit', 'same-origin' (default, matches Node/undici), 'include'. Backed by a process-wide cookie jar via System.Net.CookieContainer — handles RFC 6265 parsing, domain/path matching, expiry, Secure/HttpOnly. Each compiled DLL has its own jar.
redirect option✅follow (default), manual (return 3xx), error (throw on redirect)
Cookie jar
fetch.cookieJar.getCookies(url)✅Returns the Cookie: header that would be sent for url. SharpTS extension.
fetch.cookieJar.setCookie(cookie, url)✅Manually inject a cookie into the jar as if received from url. SharpTS extension.
fetch.cookieJar.clear()✅Removes all cookies from the jar. SharpTS extension.
headers.getSetCookie()✅Returns all Set-Cookie values as an array (WHATWG spec).
headers.get('set-cookie')✅Returns first cookie value (WHATWG spec).
Cookies persisted to disk❌Process-only; lost on exit.
http.Agent cookies option❌Cookies are jar-wide; per-Agent jars deferred.
Web Streams (WHATWG)
ReadableStream✅new ReadableStream(underlyingSource?, strategy?); start/pull/cancel callbacks; getReader(), cancel(), pipeTo(dest, opts?), pipeThrough(transform, opts?), tee(); locked property
ReadableStreamDefaultController✅enqueue(), close(), error(), desiredSize
ReadableStreamDefaultReader✅read() returns Promise<{value, done}>, releaseLock(), cancel(), closed promise
WritableStream✅new WritableStream(underlyingSink?, strategy?); start/write/close/abort callbacks; getWriter(), close(), abort(); serialized write queue
WritableStreamDefaultController✅error(), signal (AbortSignal)
WritableStreamDefaultWriter✅write(), close(), abort(), releaseLock(), closed/ready promises, desiredSize
TransformStream✅new TransformStream(transformer?, writableStrategy?, readableStrategy?); transform/flush callbacks; readable/writable properties
TransformStreamDefaultController✅enqueue(), terminate(), error(), desiredSize
ByteLengthQueuingStrategy✅new ByteLengthQueuingStrategy({ highWaterMark }); size(chunk) measures byteLength
CountQueuingStrategy✅new CountQueuingStrategy({ highWaterMark }); size() returns 1
pipeTo options✅preventClose, preventAbort, preventCancel, signal
ReadableStream.from(iterable)⚠️Eager forms supported (Array, string, Set). Async iterables and lazy iteration deferred.
Symbol.asyncIterator on ReadableStream❌for await (const chunk of rs) not yet supported. Use getReader() + manual read() loop.
BYOB readers / type: 'bytes'❌ReadableByteStreamController, BYOB requests deferred.
Transferable streams❌postMessage() of stream objects not supported.
Both globals and node:stream/web exports✅All five constructors are global AND exported from node:stream/web.
Available in interpreter and compiled modes✅Compiled mode uses late-binding reflection to runtime types (in LateBindingAllowlist); pure-IL emission deferred.

20. DNS

FeatureStatusNotes
Methods
lookup✅Resolve hostname to IP; supports family and all options
lookupService✅Reverse lookup (IP to hostname)
Constants
ADDRCONFIG✅Address configuration hint
V4MAPPED✅Map IPv4 to IPv6 hint
ALL✅Return all addresses hint
Async Resolution
resolve✅Async callback-based; supports rrtype parameter (A, AAAA, MX, TXT, SRV, CNAME, NS, SOA, PTR, CAA, NAPTR)
resolve4✅Async callback-based; resolves IPv4 via the DNS wire protocol (c-ares-style, honors SHARPTS_DNS_SERVER; does not read the hosts file — use lookup for that)
resolve6✅Async callback-based; resolves IPv6 via the DNS wire protocol (c-ares-style; does not read the hosts file)
reverse✅Async callback-based; reverse DNS lookup
resolveMx✅MX records → [{ exchange, priority }]
resolveTxt✅TXT records → string[][] (chunks per record)
resolveSrv✅SRV records → [{ name, port, priority, weight }]
resolveCname✅CNAME records → string[]
resolveNs✅NS records → string[]
resolveSoa✅SOA record → { nsname, hostmaster, serial, refresh, retry, expire, minttl }
resolvePtr✅PTR records → string[]
resolveCaa✅CAA records → [{ critical, issue/issuewild/iodef }]
resolveNaptr✅NAPTR records → [{ flags, service, regexp, replacement, order, preference }]
Promise API
dns/promises✅Promise-based: all callback methods available as promise variants
dns.promises✅Sub-module access to promise API
Resolver
Resolver class✅new dns.Resolver() with configurable servers
resolver.setServers()✅Set custom DNS servers (IP addresses with optional port)
resolver.getServers()✅Get configured DNS server list
resolver.resolve()✅All resolve methods use configured servers
resolver.cancel()⚠️No-op (no cancellation tracking)

21. HTTP

FeatureStatusNotes
Server
createServer✅Create HTTP server with request handler
server.listen()✅Start listening on port
server.close()✅Stop server
Client
request✅Make HTTP request (delegates to fetch)
get✅Shorthand for GET requests
Constants
METHODS✅Array of supported HTTP methods
STATUS_CODES✅Map of status codes to messages
globalAgent✅Global HTTP agent (SharpTSAgent singleton with full Agent API)
IncomingMessage
Readable stream methods✅on, pipe, read, pause, resume, push (extends Readable)
method, url, headers✅Request properties
httpVersion✅Protocol version
rawHeaders✅Alternating [name, value] array
complete✅Whether body has been fully read
ServerResponse
Writable stream methods✅on, write, end, cork, uncork (extends Writable)
writeHead()✅Set status code, message, and headers
setHeader() / getHeader()✅Individual header management
hasHeader() / removeHeader()✅Header inspection and removal
getHeaderNames()✅List all set header names
flushHeaders()✅Send headers immediately
statusCode / statusMessage✅Readable/writable properties
headersSent / finished✅State properties
finish / close events✅Writable stream events on end
Agent
Agent class✅new http.Agent(options?) constructor with keepAlive, maxSockets, maxTotalSockets, maxFreeSockets, keepAliveMsecs, timeout, scheduling
agent.destroy()✅Marks agent as destroyed
agent.getName(options?)✅Returns pool key string (host:port:localAddress:family)
agent.createConnection()✅Stub (connection pooling handled by .NET HttpClient)
agent.sockets/freeSockets/requests✅Empty objects (pooling managed internally by .NET)

22. NET (TCP)

FeatureStatusNotes
Server
createServer(options?, listener?)✅Create TCP server with optional connection listener
server.listen(port, host?, callback?)✅Start listening on port; supports port 0 for auto-assign
server.close(callback?)✅Stop accepting new connections
server.address()✅Returns { address, family, port }
server.getConnections(callback)✅Get number of concurrent connections
server.listening✅Whether server is listening
server.maxConnections✅Limit concurrent connections
Server events✅'connection', 'listening', 'close', 'error'
Socket
createConnection(options, listener?)✅Create client socket and connect
connect(options, listener?)✅Alias for createConnection
socket.write(data, encoding?, callback?)✅Write data to socket
socket.end(data?, encoding?, callback?)✅Half-close the socket
socket.destroy(error?)✅Fully close and clean up
socket.setEncoding(encoding)✅Set string encoding for data events
socket.setTimeout(timeout, callback?)✅Set socket timeout
socket.setNoDelay(noDelay?)✅Disable Nagle's algorithm
socket.setKeepAlive(enable?, delay?)✅Enable/disable keep-alive
socket.address()✅Local address info
socket.pause() / resume()✅Flow control
socket.pipe(dest)✅Pipe to writable stream
Socket properties✅remoteAddress, remotePort, remoteFamily, localAddress, localPort, bytesRead, bytesWritten, connecting, destroyed, readyState
Socket events✅'connect', 'data', 'end', 'close', 'error', 'drain', 'timeout'
Utilities
isIP(input)✅Returns 4 (IPv4), 6 (IPv6), or 0 (invalid)
isIPv4(input)✅True if valid IPv4 address
isIPv6(input)✅True if valid IPv6 address
IPC
IPC sockets✅Named pipes (Windows) / Unix domain sockets (Linux/macOS); server.listen(path), createConnection({path}), remoteFamily='pipe', error codes (ENOENT/ECONNREFUSED)
socket.ref() / unref()⚠️Basic support via event loop ref counting

23. TLS (SSL)

FeatureStatusNotes
Server
createServer(options?, listener?)✅Create TLS server with cert/key options
server.listen(port, host?, callback?)✅Start listening; requires key+cert
server.close(callback?)✅Stop accepting new connections
server.address()✅Returns { address, family, port }
server.getConnections(callback)✅Get number of concurrent connections
server.listening✅Whether server is listening
Server events✅'secureConnection', 'tlsClientError', 'listening', 'close', 'error'
TLSSocket
connect(port, host?, options?, callback?)✅Create TLS client connection
connect(options, callback?)✅Options-based connect variant
socket.authorized✅Whether peer certificate was verified
socket.encrypted✅Always true for TLS sockets
socket.alpnProtocol✅Negotiated ALPN protocol
socket.getCipher()✅Returns { name, standardName, version }
socket.getPeerCertificate()✅Returns { subject, issuer, valid_from, valid_to, serialNumber }
socket.getProtocol()✅Returns 'TLSv1.2' or 'TLSv1.3'
All net.Socket methods✅Inherits write, end, destroy, setEncoding, etc.
TLSSocket events✅'secureConnect' + all net.Socket events
Module Functions
createSecureContext(options?)✅Create reusable secure context
DEFAULT_MIN_VERSION✅'TLSv1.2'
DEFAULT_MAX_VERSION✅'TLSv1.3'
Advanced
ALPN negotiation✅ALPNProtocols option on client and server; socket.alpnProtocol returns negotiated protocol
Client certificate auth⚠️requestCert option exists but limited
SNI callback✅SNICallback option on server; receives hostname, returns { cert, key } for dynamic cert selection

24. DGRAM (UDP)

FeatureStatusNotes
Socket Creation
createSocket(type)✅'udp4' or 'udp6'
createSocket(options, callback?)✅Options with type field
Socket Methods
socket.bind(port?, address?, callback?)✅Bind to local address; port 0 for auto-assign
socket.send(msg, port, address?, callback?)✅Send datagram; string or Buffer
socket.send(msg, offset, length, port, address?, callback?)✅Send with offset/length
socket.close(callback?)✅Close socket
socket.address()✅Returns { address, family, port }
socket.setBroadcast(flag)✅Enable/disable broadcast
socket.setTTL(ttl)✅Set IP TTL
socket.setMulticastTTL(ttl)✅Set multicast TTL
socket.addMembership(addr, iface?)✅Join multicast group
socket.dropMembership(addr)✅Leave multicast group
socket.ref() / unref()✅Event loop ref counting
Events
'message'✅(msg: Buffer, rinfo: { address, family, port, size })
'listening'✅Emitted after bind completes
'close'✅Emitted after socket closed
'error'✅Emitted on error
EventEmitter✅on, once, off, emit, removeListener, etc.
Connected Mode
socket.connect(port, address?)✅Connected UDP mode; emits 'connect' event
socket.disconnect()✅Disconnect from remote address
socket.remoteAddress()✅Returns { address, family, port } for connected socket
socket.getRecvBufferSize() / setRecvBufferSize()✅Receive buffer size control
socket.getSendBufferSize() / setSendBufferSize()✅Send buffer size control

25. WORKER_THREADS

FeatureStatusNotes
Worker Creation
Worker constructor✅Create worker from script file
workerData✅Pass data to worker
Thread Identity
isMainThread✅Check if running on main thread
threadId✅Current thread identifier
Messaging
parentPort✅Port for worker-to-parent communication
MessageChannel✅Create connected port pairs
receiveMessageOnPort✅Sync message receive
postMessage✅Send messages between threads
Environment
getEnvironmentData✅Get shared environment data
setEnvironmentData✅Set shared environment data
SHARE_ENV⚠️Symbol exists, env sharing not supported
Utilities
markAsUntransferable⚠️No-op (no transferability tracking)
Not Implemented
moveMessagePortToContext❌Requires VM module
resourceLimits❌No resource limiting
BroadcastChannel✅new BroadcastChannel(name); postMessage, close, on('message'), addEventListener, ref/unref; also exported from worker_threads. Cross-thread delivery within a single process via the singleton event loop.

26. VM

FeatureStatusNotes
Static Methods
vm.runInNewContext(code, ctx?, opts?)✅Executes code in fresh isolated context; context object properties seeded as variables; mutations written back
vm.runInThisContext(code, opts?)✅Executes code in caller's scope (interpreter mode)
vm.createContext(obj?)✅Tags object as vm context; creates empty context if no arg
vm.isContext(obj)✅Returns whether object was contextified
Script Class
new vm.Script(code, opts?)✅Pre-parses code for repeated execution (interpreter mode)
script.runInNewContext(ctx?, opts?)✅Runs pre-parsed script in fresh context (interpreter mode)
script.runInThisContext(opts?)✅Runs pre-parsed script in caller's scope (interpreter mode)
script.runInContext(ctx, opts?)✅Runs pre-parsed script in given context (interpreter mode)
vm.compileFunction(code, params?, opts?)✅Compiles function body with named params; parsingContext, contextExtensions options
Not Implemented
vm.Module / vm.SourceTextModule❌Experimental in Node.js
timeout option✅Execution timeout in ms; throws Error on expiry; checked per-statement and per-loop-iteration
vm.measureMemory❌V8-specific, not applicable

Summary

SharpTS provides comprehensive support for file system operations (sync, callback-based async, and promise-based via fs/promises), including file descriptor APIs, directory utilities, hard/symbolic links, permissions, file watching (watch, watchFile, unwatchFile), and streaming (createReadStream, createWriteStream). Also includes path manipulation, OS information, process management, crypto (hashing, encryption, key derivation, signing), URL parsing, binary data handling via Buffer, EventEmitter for event-driven patterns, timers (setTimeout/setInterval/setImmediate), string decoding for multi-byte characters, high-resolution performance timing, stream classes (Readable, Writable, Duplex, Transform, PassThrough) with flowing mode (auto-flowing on data listener, pause/resume, pipe backpressure), the Web Fetch API for HTTP client requests with AbortController support, HTTP/HTTPS servers via http.createServer/https.createServer, TLS/SSL via tls module, TCP via net module, UDP via dgram module (including connected mode), DNS resolution (full record type support), cluster module for multi-process scaling, and Worker Threads for parallel execution. The module system supports both ES modules and CommonJS import syntax.

Key Gaps:

  • None — all major Node.js APIs are implemented

Recommended Workarounds:

  • Use ES module syntax instead of require()
  • Use fetch() for HTTP client requests (simpler than http.request)

Priority features to implement for broader Node.js compatibility:

  1. package.json exports ✅ Implemented: subpath exports, conditional exports, wildcard patterns, self-referencing, subpath imports
  2. AsyncLocalStorage / async_hooks ✅ Implemented: AsyncLocalStorage with run, getStore, enterWith, exit, disable; async context propagation across await/Promise.then
  3. IPC sockets ✅ Implemented: Named pipes (Windows) / Unix domain sockets (Linux/macOS) with error codes, server.address() returns pipe path
  4. cluster HTTP port sharing ✅ Implemented: SharedTcpListener/SharedHttpListener with round-robin dispatch via atomic counter; server.listen() intercepted in worker mode
  5. vm.timeout option ✅ Implemented: CancellationToken-based timeout checked per-statement and per-loop-iteration; throws Error on expiry