tvl-depot/tvix/eval/docs/builtins.md

Nix builtins

Nix has a lot of built-in functions, some of which are accessible in the global scope, and some of which are only accessible through the global builtins attribute set.

This document is an attempt to track all of these builtins, but without documenting their functionality.

See also https://nixos.org/manual/nix/stable/expressions/builtins.html

name	global	arity	pure
abort	true	1
add	false	2	true
addErrorContext	false	?
all	false	2	true
any	false	2	true
appendContext	false	?
attrNames	false	1	true
attrValues	false		true
baseNameOf	true
bitAnd	false
bitOr	false
bitXor	false
builtins	true
catAttrs	false
compareVersions	false
concatLists	false
concatMap	false
concatStringsSep	false
currentSystem	false
currentTime	false
deepSeq	false
derivation	true
derivationStrict	true
dirOf	true
div	false
elem	false
elemAt	false
false	true
fetchGit	true
fetchMercurial	true
fetchTarball	true
fetchurl	false
filter	false
filterSource	false
findFile	false
foldl'	false
fromJSON	false
fromTOML	true
functionArgs	false
genList	false
genericClosure	false
getAttr	false
getContext	false
getEnv	false		false
hasAttr	false
hasContext	false
hashFile	false
hashString	false
head	false
import	true
intersectAttrs	false
isAttrs	false
isBool	false
isFloat	false
isFunction	false
isInt	false
isList	false
isNull	true
isPath	false
isString	false
langVersion	false
length	false
lessThan	false
listToAttrs	false
map	true
mapAttrs	false
match	false
mul	false
nixPath	false
nixVersion	false
null	true
parseDrvName	false
partition	false
path	false
pathExists	false
placeholder	true
readDir	false
readFile	false
removeAttrs	true
replaceStrings	false
scopedImport	true
seq	false
sort	false
split	false
splitVersion	false
storeDir	false
storePath	false
stringLength	false
sub	false
substring	false
tail	false
throw	true
toFile	false
toJSON	false
toPath	false
toString	true
toXML	false
trace	false
true	true
tryEval	false
typeOf	false
unsafeDiscardOutputDependency	false
unsafeDiscardStringContext	false
unsafeGetAttrPos	false
valueSize	false

Added after C++ Nix 2.3 (without Flakes enabled)

name	global	arity	pure
break	false	1
ceil	false	1	true
fetchTree	true	1
floor	false	1	true
groupBy	false	2	true
traceVerbose	false	2
zipAttrsWith	false	2	true