Extract and cache IR.
Updating any of the underlying files in the container during the lifetime of a returned VirtualScalaJSIRFile yields unspecified behavior.
Should be called if this cache is not used anymore.
Should be called if this cache is not used anymore.
Frees resources in the global cache, if they are not used anymore. The cache may be reused after calling free (but this is not any faster than calling IRFileCache.newCache, modulo the object allocation).
A cache to use for individual runs. Not threadsafe