diff options
Diffstat (limited to 'lib/types.nix')
-rw-r--r-- | lib/types.nix | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/lib/types.nix b/lib/types.nix index e22bcd326c86..9c00656ab918 100644 --- a/lib/types.nix +++ b/lib/types.nix @@ -443,6 +443,13 @@ rec { functor = (defaultFunctor name) // { wrapped = [ t1 t2 ]; }; }; + # Any of the types in the given list + oneOf = ts: + let + head' = if ts == [] then throw "types.oneOf needs to get at least one type in its argument" else head ts; + tail' = tail ts; + in foldl' either head' tail'; + # Either value of type `finalType` or `coercedType`, the latter is # converted to `finalType` using `coerceFunc`. coercedTo = coercedType: coerceFunc: finalType: |