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feat(function): add once run-at-most-once wrapper - #134
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Add a new wellcrafted/function subpath whose first export, once(fn), runs the wrapped function at most once: the first call invokes it and caches the result, and every later call returns that cached result while ignoring any arguments passed after the first. This is a generic, dependency-free combinator that previously lived mis-homed in a heavy CRDT package; consumers can now reach it without that dependency. The subpath is additive, so no existing import changes.
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onceat a newwellcrafted/functionsubpath.once(fn)runs the wrapped function at most once: the first call invokes it and caches the result; every later call returns that cached result and ignores any arguments passed after the first.It is a generic, dependency-free combinator, useful for idempotent disposal (a
[Symbol.dispose]reachable from more than one teardown path) and lazy one-time initialization. The subpath is additive, so no existing import changes../functionis a new single-concept module alongsidebrand,json, andtesting: wired into theexportsmap and the tsdown entry list, and named with room for future combinators (memoize,debounce).Carries a minor changeset; the version bump and CHANGELOG entry are left to the release flow.