Whether value is an Error carrying one of the given Node code strings — ENOENT, EADDRINUSE, EBUSY. With no codes it matches any error that has a string code at all (which includes Node's ERR_* internal errors, e.g. ERR_MODULE_NOT_FOUND).

Calls fn(...args) and returns the value bare, classifying any throw into the declared Failure classify builds — the boundary and the declaration fused into one expression, producing the bare union directly. The sync sibling of Task#mapErr: like that adapter edge it deliberately catches everything, because this IS the edge where a foreign throw becomes a declared failure — chain the original under cause. When the boundary should stay raw and the declaration should be a separate visible rethrow line, use Result.try instead.

Calls fn(...args) and reflects the outcome into a Caught box — Result.try, shaped like Promise.try. See the module doc for the flat-classification pattern this is half of.

Minimal shape of a Node system error, declared locally so this module stays runtime-free.

What the boundary hands back: the value, or whatever was caught — unknown, honestly, because a catch binding is exactly as untrustworthy.

The caught variant. value is present-but-undefined for shape stability.

The success variant of a caught outcome. error is present-but-undefined for shape stability.

The outcome of rescue(): the bare T | F union, promise-wrapped when fn was async. A leaking any collapses to unknown so it cannot pose as an inspected type.