multiSpec

Usage: multiSpec(mm retag)

Takes the name of a spec/predicate-returning multimethod and a tag-restoring keyword or fn (retag). Returns a spec that when conforming or explaining data will pass it to the multimethod to get an appropriate spec. You can e.g. use multiSpec to dynamically and extensibly associate specs with 'tagged' data (i.e. data where one of the fields indicates the shape of the rest of the structure).

Source

Note: NodeJS doesn't have multimethods, so you will have to use a library like genfun here.

Example:

const s = require('speculaas');