Adding 'MustExist' constructor to assert a file is assumed to exist #85
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There are times when it is advantageous to assert that a file "must already exist" on the file system and if it does not exist, a
FsResourceDoesNotExist
exception ought to be thrown. To enable these semantics through the API of thefs-api
/fs-sim
packages, I have added aMustExist
constructor to theAllowExisting
type.