Packages

The guide is organised by subject rather than by package, so this page is the bridge: it is how you get from a package name you already have — in an error message, in a package.json, in somebody else’s import — to the pages that explain it.

Install any of them with your package manager of choice; every name below is published under the @ac-kit scope.

Portable packages import no host built-ins and run under Node, browsers, Deno, Bun and edge runtimes alike. Node only packages are bound to a host, and a portable package will never depend on one.

Language utilities

The operations on strings, numbers, iterables and objects that the standard library leaves out.

package	runs on	what it is for
@ac-kit/core	Anywhere	Guards, type helpers, iterables, strings, numbers, objects, time and bytes

Collections & algorithms

Data structures with predictable costs, and the algorithms that work over any shape rather than one structure.

package	runs on	what it is for
@ac-kit/algo	Anywhere	Search, traversal, selection, grouping and set operations over any shape
@ac-kit/data	Anywhere	Lists, deques, queues, heaps, sets, maps, graphs, tries and indexes

Concurrency & async

Coordinating work that overlaps in time: locks, channels, events and cancellation.

package	runs on	what it is for
@ac-kit/async	Anywhere	Events, mutexes, semaphores, barriers, latches, signals and channels

Mathematics

Numbers and the things done with them — from what floating point actually guarantees to special functions and numerical calculus.

package	runs on	what it is for
@ac-kit/math-algebra	Anywhere	Algebraic structures as evidence values, and the algorithms they unlock
@ac-kit/math-analysis	Anywhere	Special functions, root finding, quadrature and continued fractions
@ac-kit/math-color	Anywhere	Colour spaces, conversions, gamut mapping and perceptual difference
@ac-kit/math-combinatorics	Anywhere	Factorials, binomial coefficients and permutation or subset generation
@ac-kit/math-complex	Anywhere	Complex numbers as a tuple, with their arithmetic
@ac-kit/math-curves	Anywhere	Bézier curves, splines, arc length and curve fitting
@ac-kit/math-geometry	Anywhere	Shapes, coordinate systems, angles and meshes in 2D, 3D and 4D
@ac-kit/math-grid	Anywhere	Discrete lattices: storage, packing, tiling and pixel conversion
@ac-kit/math-integer	Anywhere	Bit manipulation, GCD, modular arithmetic and primality
@ac-kit/math-linear	Anywhere	Fixed-dimension vectors, matrices and rotations
@ac-kit/math-numbers	Anywhere	The number tower: arbitrary-precision integers, decimals and fractions
@ac-kit/math-random	Anywhere	Fast, seedable, non-cryptographic pseudorandom generators
@ac-kit/math-scalar	Anywhere	What binary64 actually guarantees: error-free transforms and tolerances
@ac-kit/math-signal	Anywhere	Transforms, convolution, filters and windows
@ac-kit/math-stats	Anywhere	Descriptive statistics, distributions, inference and regression

Data formats

Reading and writing the file and wire formats other people's software produces.

package	runs on	what it is for
@ac-kit/format-ansi	Anywhere	ANSI and xterm escape sequences: parsing, stripping, colour and hyperlinks
@ac-kit/format-asn1	Anywhere	X.690 BER, CER, DER and PER encoding with schema-bound codecs
@ac-kit/format-asn1-compiler	Anywhere	Turning X.680 notation into runtime ASN.1 schemas
@ac-kit/format-asn1-notation	Anywhere	X.680 ASN.1 notation: syntax tree, parser and printer
@ac-kit/format-cbor	Anywhere	Concise Binary Object Representation encoding and decoding
@ac-kit/format-core	Anywhere	The Decoder, Encoder, Codec and streaming contracts every format shares
@ac-kit/format-cron	Anywhere	Cron expression parsing and next-occurrence computation
@ac-kit/format-css-color	Anywhere	CSS Color 4 parsing, printing, resolution and the 148 keywords
@ac-kit/format-csv	Anywhere	RFC 4180 rows and streams, plus rendering a DataFrame as CSV
@ac-kit/format-editorconfig	Anywhere	EditorConfig parsing, property resolution and text normalization
@ac-kit/format-glob	Anywhere	Glob syntax tree, parser, printer and matcher, with selectable dialects and a segment-oriented path face
@ac-kit/format-hid	Anywhere	USB HID report descriptors: items, reports, fields and bit-level values
@ac-kit/format-http	Anywhere	RFC 9110 field grammar, HTTP/1.1 message codecs, and the HTTP/2 frame codec with HPACK
@ac-kit/format-ini	Anywhere	Order-preserving INI tree with span-targeted editing
@ac-kit/format-json	Anywhere	JSON parsing and serialization
@ac-kit/format-json5	Anywhere	JSON5 parsing and serialization
@ac-kit/format-jsonc	Anywhere	JSON-with-comments parsing and serialization
@ac-kit/format-language-tag	Anywhere	BCP 47 tag parsing and printing, with RFC 4647 lookup and filtering
@ac-kit/format-markdown	Anywhere	GitHub Flavored Markdown rendering
@ac-kit/format-midi	Anywhere	MIDI 1.0 messages over a live byte stream, Standard MIDI Files, notes and lyrics with their times, and conversion to a Song
@ac-kit/format-monospace	Anywhere	Fixed-width layout: tables, grapheme-aware widths, truncation, spinners
@ac-kit/format-ndjson	Anywhere	Newline-delimited JSON parsing and serialization
@ac-kit/format-netstring	Anywhere	Netstring framing as a zero-copy codec and a TransformStream
@ac-kit/format-oid	Anywhere	Object identifiers and their registry
@ac-kit/format-osc	Anywhere	Open Sound Control packets, NTP time tags, and datagram and stream framing codecs
@ac-kit/format-po	Anywhere	GNU gettext PO and POT parsing, printing and Plural-Forms evaluation
@ac-kit/format-regex	Anywhere	Regular expression syntax tree and a Pike virtual machine
@ac-kit/format-shell	Anywhere	Shell command-line quoting and environment variable syntax
@ac-kit/format-toml	Anywhere	TOML parsing and serialization
@ac-kit/format-varint	Anywhere	Base-128 variable-length integers, in number and bigint
@ac-kit/format-websocket	Anywhere	WebSocket frames with streamed payloads, masking, and close codes
@ac-kit/format-yaml	Anywhere	YAML parsing and serialization

Cryptography

Hashing, authentication and randomness, plus the non-cryptographic hashes that must never be confused with them.

package	runs on	what it is for
@ac-kit/crypto-hash	Anywhere	MD5, SHA-1, SHA-2, SHA-3/SHAKE, BLAKE2, RIPEMD-160 and SM3
@ac-kit/crypto-mac	Anywhere	HMAC, CMAC, GMAC and Poly1305 message authentication
@ac-kit/crypto-random	Anywhere	Cryptographically secure random bytes and deterministic DRBGs
@ac-kit/crypto-safe	Anywhere	Constant-time comparison, selection and arithmetic
@ac-kit/noncrypto-hash	Anywhere	Fast hashes, checksums and rolling hashes — never for security

Networking & protocols

Protocol clients written against a transport boundary, so the same client runs over TCP, TLS or a test double.

package	runs on	what it is for
@ac-kit/net-address	Anywhere	IPv4, IPv6, MAC/EUI and ports: parsing, CIDR arithmetic, scopes
@ac-kit/net-core	Anywhere	The Transport boundary every protocol is written against, listener and connector types, and the multiplexed connection contract
@ac-kit/net-http	Anywhere	HTTP/1.1, HTTP/2 and HTTP/3 server and pooling client over any transport, version-neutral message types
@ac-kit/net-imap	Anywhere	IMAP client over any transport
@ac-kit/net-osc	Anywhere	Open Sound Control endpoint over any transport, and OSC URLs
@ac-kit/net-pop3	Anywhere	POP3 client over any transport
@ac-kit/net-quic	Node only	QUIC listener and connector over a native quiche binding, yielding multiplexed connections
@ac-kit/net-smtp	Anywhere	SMTP and LMTP clients over any transport
@ac-kit/net-socketmap	Anywhere	Postfix socketmap protocol client and server
@ac-kit/net-transport-node	Node only	Transports, a TCP and TLS listener and connector with ALPN, on Node sockets
@ac-kit/net-websocket	Anywhere	WebSocket peer and opening handshake over any transport

Node.js integration

The host-bound layer: processes, files, sockets and everything that only exists under Node.

package	runs on	what it is for
@ac-kit/node	Node only	Node built-in extensions: processes, files, streams and sockets

Application building blocks

Configuration, logging, reporting, terminal output and translation, for programs rather than libraries.

package	runs on	what it is for
@ac-kit/app-config	Node only	Locating, reading and resolving configuration files
@ac-kit/app-i18n	Anywhere	Message catalogues, plural selection and locale negotiation
@ac-kit/app-logger	Node only	Structured logging over the shared report pipeline
@ac-kit/app-report	Anywhere	The event pipeline logging and reporting both build on
@ac-kit/app-system	Node only	Process lifecycle, PID files, binary lookup and log rotation
@ac-kit/app-terminal	Anywhere	Terminal capability description, styling, glyphs and live regions

External programs

Typed wrappers over command-line programs installed separately, such as git and docker.

package	runs on	what it is for
@ac-kit/cmd-docker	Node only	Typed invocation of the docker command-line program
@ac-kit/cmd-git	Node only	Typed invocation of the git command-line program

Data modelling

Descriptions of data and of charts, kept separate from anything that stores or draws them.

package	runs on	what it is for
@ac-kit/model-chart	Anywhere	PlotSpec: what a chart is, with nothing that draws one
@ac-kit/model-dataset	Anywhere	DataFrame and its schema: fields, units and number formatting
@ac-kit/model-music	Anywhere	Song: notes timed in divisions and seconds, parts, tempo map, meter, measures and dynamics

Project tooling

Shared build, lint and test configuration, and the fixtures test suites read from. Of interest to contributors, not to callers.

package	runs on	what it is for
@ac-kit/biome-config	Anywhere	Shared Biome configuration
@ac-kit/fixture-crypto	Node only	NIST CAVP, Wycheproof and RFC known-answer vectors, for tests only
@ac-kit/fixture-util	Node only	Acquiring and caching the fixture corpora test suites read
@ac-kit/fixture-x509	Node only	PKITS, OpenSSL and BouncyCastle certificate corpora, for tests only
@ac-kit/integration-test-util	Node only	Subprocess and container helpers for integration suites
@ac-kit/markdownlint-cli2-config	Anywhere	Shared markdownlint-cli2 configuration
@ac-kit/markdownlint-config	Anywhere	Shared markdownlint rule set
@ac-kit/oxlint-config	Anywhere	Shared oxlint and oxfmt configuration
@ac-kit/test-util	Anywhere	Assertions and generators shared across test suites
@ac-kit/tsconfig	Anywhere	The tsconfig bases every package extends
@ac-kit/typedoc-config	Anywhere	Shared TypeDoc configuration
@ac-kit/vitest-config	Anywhere	Shared Vitest project and workspace configuration