Module catalogue

@stopcock/fp keeps its root small. Import specialist APIs from these stable, tree-shakeable subpaths.

Collections and sequences

Subpath	Purpose
/array	Eager array operators, streaming steps the build-time compiler can fuse, explicit *Into writes
/readonly-array	Read-only alias of the array vocabulary
/non-empty-array	Constructors and total operations for non-empty arrays
/tuple	Typed tuple construction, mapping, zipping, and projection
/record	Homogeneous property-keyed dictionaries with one value type
/map	Immutable Map operations
/set	Immutable Set operations
/typed-array	Numeric typed-array transforms and explicit destination buffers
/indexed	Shared indexed-collection operations
/iter	Lazy synchronous sequences

Writable *Into operations preserve the concrete destination type. They reject fixed tuples, heterogeneous or refined record destinations, and ambiguous mutable target unions whenever mutation cannot be proven sound.

Data and errors

Subpath	Purpose
/option	Explicit absence
/result	Fail-fast recoverable errors
/validation	Accumulating independent errors
/schema	Standard Schema V1 production and consumption
/these	Left, right, or both values
/nullable	Focused nullable boundary helpers

Asynchronous failures and asynchronous iteration are provided by @stopcock/async, not duplicated in the core package.

Algebra and comparison

Subpath	Purpose
/eq	Lawful equality relations
/hash	Composable deterministic hashing
/ord	Total ordering instances
/ordering	Primitive ordering values and combinators
/semigroup	Associative combination
/monoid	Combination with an identity
/group	Combination with inversion

Functions and data transformation

Subpath	Purpose
/function	Composition, currying, memoization, predicates, and function utilities
/guard	Structural guards and refinements
/object	Immutable object/path operations
/string	String transforms and predicates
/number	Numeric predicates, statistics, and safe partials
/math	Arithmetic pipeline operators
/boolean	Boolean combinators
/dual	Build data-first and data-last APIs
/compile	compile/compilePure markers the build-time compiler recognizes; uncompiled, they alias pipe
/fusion	Same pipe/flow/compile, imported by a name that says “I mean fusion”
/fusion/debug	explain/explainPure; always report 'sequential' at runtime
/optic	Lenses, optionals, prisms, traversals, and more
/match	Exhaustive tagged-value matching

Functional models

Subpath	Purpose
/reader	Environment-dependent computations
/state-fn	Pure state transitions
/writer	Values paired with accumulated output
/recursion	Stack-safe recursion schemes

The package export map is generated from one checked-in manifest. CI builds and imports every runtime and declaration entry from a real packed tarball, so this catalogue cannot silently advertise a missing module.