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luau/tests/TypeInfer.typePacks.cpp

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// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
#include "Luau/BuiltinDefinitions.h"
#include "Luau/TypeInfer.h"
#include "Luau/Type.h"
#include "Fixture.h"
#include "doctest.h"
using namespace Luau;
TEST_SUITE_BEGIN("TypePackTests");
TEST_CASE_FIXTURE(Fixture, "infer_multi_return")
{
CheckResult result = check(R"(
function take_two()
return 2, 2
end
)");
LUAU_REQUIRE_NO_ERRORS(result);
const FunctionType* takeTwoType = get<FunctionType>(requireType("take_two"));
REQUIRE(takeTwoType != nullptr);
const auto& [returns, tail] = flatten(takeTwoType->retTypes);
CHECK_EQ(2, returns.size());
CHECK_EQ(builtinTypes->numberType, follow(returns[0]));
CHECK_EQ(builtinTypes->numberType, follow(returns[1]));
CHECK(!tail);
}
TEST_CASE_FIXTURE(Fixture, "empty_varargs_should_return_nil_when_not_in_tail_position")
{
CheckResult result = check(R"(
local a, b = ..., 1
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "self_and_varargs_should_work")
{
CheckResult result = check(R"(
local t = {}
function t:f(...) end
t:f(1)
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "last_element_of_return_statement_can_itself_be_a_pack")
{
CheckResult result = check(R"(
function take_two()
return 2, 2
end
function take_three()
return 1, take_two()
end
)");
LUAU_REQUIRE_NO_ERRORS(result);
dumpErrors(result);
const FunctionType* takeOneMoreType = get<FunctionType>(requireType("take_three"));
REQUIRE(takeOneMoreType != nullptr);
const auto& [rets, tail] = flatten(takeOneMoreType->retTypes);
REQUIRE_EQ(3, rets.size());
CHECK_EQ(builtinTypes->numberType, follow(rets[0]));
CHECK_EQ(builtinTypes->numberType, follow(rets[1]));
CHECK_EQ(builtinTypes->numberType, follow(rets[2]));
CHECK(!tail);
}
TEST_CASE_FIXTURE(Fixture, "higher_order_function")
{
CheckResult result = check(R"(
function apply(f, g, x)
return f(g(x))
end
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ("<a, b..., c...>((b...) -> (c...), (a) -> (b...), a) -> (c...)", toString(requireType("apply")));
}
TEST_CASE_FIXTURE(Fixture, "return_type_should_be_empty_if_nothing_is_returned")
{
CheckResult result = check(R"(
function f() end
function g() return end
)");
LUAU_REQUIRE_NO_ERRORS(result);
const FunctionType* fTy = get<FunctionType>(requireType("f"));
REQUIRE(fTy != nullptr);
CHECK_EQ(0, size(fTy->retTypes));
const FunctionType* gTy = get<FunctionType>(requireType("g"));
REQUIRE(gTy != nullptr);
CHECK_EQ(0, size(gTy->retTypes));
}
TEST_CASE_FIXTURE(Fixture, "no_return_size_should_be_zero")
{
CheckResult result = check(R"(
function f(a:any) return a end
function g() return end
function h() end
g(h())
f(g(),h())
)");
LUAU_REQUIRE_NO_ERRORS(result);
const FunctionType* fTy = get<FunctionType>(requireType("f"));
REQUIRE(fTy != nullptr);
CHECK_EQ(1, size(follow(fTy->retTypes)));
const FunctionType* gTy = get<FunctionType>(requireType("g"));
REQUIRE(gTy != nullptr);
CHECK_EQ(0, size(gTy->retTypes));
const FunctionType* hTy = get<FunctionType>(requireType("h"));
REQUIRE(hTy != nullptr);
CHECK_EQ(0, size(hTy->retTypes));
}
TEST_CASE_FIXTURE(Fixture, "varargs_inference_through_multiple_scopes")
{
CheckResult result = check(R"(
local function f(...)
do
local a: string = ...
local b: number = ...
end
end
f("foo")
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "multiple_varargs_inference_are_not_confused")
{
CheckResult result = check(R"(
local function f(...)
local a: string = ...
return function(...)
local b: number = ...
end
end
f("foo", "bar")(1, 2)
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "parenthesized_varargs_returns_any")
{
CheckResult result = check(R"(
--!strict
local value
local function f(...)
value = ...
end
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ("any", toString(requireType("value")));
}
TEST_CASE_FIXTURE(Fixture, "variadic_packs")
{
TypeArena& arena = frontend.globals.globalTypes;
unfreeze(arena);
TypePackId listOfNumbers = arena.addTypePack(TypePackVar{VariadicTypePack{builtinTypes->numberType}});
TypePackId listOfStrings = arena.addTypePack(TypePackVar{VariadicTypePack{builtinTypes->stringType}});
// clang-format off
addGlobalBinding(frontend.globals, "foo",
arena.addType(
FunctionType{
listOfNumbers,
arena.addTypePack({builtinTypes->numberType})
}
),
"@test"
);
addGlobalBinding(frontend.globals, "bar",
arena.addType(
FunctionType{
arena.addTypePack({{builtinTypes->numberType}, listOfStrings}),
arena.addTypePack({builtinTypes->numberType})
}
),
"@test"
);
// clang-format on
freeze(arena);
CheckResult result = check(R"(
--!strict
foo(1, 2, 3, "foo")
bar(1, "foo", "bar", 3)
)");
LUAU_REQUIRE_ERROR_COUNT(2, result);
CHECK_EQ(
result.errors[0], (TypeError{Location(Position{3, 21}, Position{3, 26}), TypeMismatch{builtinTypes->numberType, builtinTypes->stringType}}));
CHECK_EQ(
result.errors[1], (TypeError{Location(Position{4, 29}, Position{4, 30}), TypeMismatch{builtinTypes->stringType, builtinTypes->numberType}}));
}
TEST_CASE_FIXTURE(Fixture, "variadic_pack_syntax")
{
CheckResult result = check(R"(
--!strict
local function foo(...: number)
end
foo(1, 2, 3, 4, 5, 6)
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ(toString(requireType("foo")), "(...number) -> ()");
}
TEST_CASE_FIXTURE(Fixture, "type_pack_hidden_free_tail_infinite_growth")
{
CheckResult result = check(R"(
--!nonstrict
if _ then
_[function(l0)end],l0 = _
elseif _ then
return l0(nil)
elseif 1 / l0(nil) then
elseif _ then
return #_,l0()
end
)");
LUAU_REQUIRE_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "variadic_argument_tail")
{
CheckResult result = check(R"(
local _ = function():((...any)->(...any),()->())
return function() end, function() end
end
for y in _() do
end
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "type_alias_type_packs")
{
CheckResult result = check(R"(
type Packed<T...> = (T...) -> T...
local a: Packed<>
local b: Packed<number>
local c: Packed<string, number>
)");
LUAU_REQUIRE_NO_ERRORS(result);
auto tf = lookupType("Packed");
REQUIRE(tf);
CHECK_EQ(toString(*tf), "(T...) -> (T...)");
CHECK_EQ(toString(requireType("a")), "() -> ()");
CHECK_EQ(toString(requireType("b")), "(number) -> number");
CHECK_EQ(toString(requireType("c")), "(string, number) -> (string, number)");
result = check(R"(
-- (U..., T) cannot be parsed right now
type Packed<T, U...> = { f: (a: T, U...) -> (T, U...) }
local a: Packed<number>
local b: Packed<string, number>
local c: Packed<string, number, boolean>
)");
LUAU_REQUIRE_NO_ERRORS(result);
tf = lookupType("Packed");
REQUIRE(tf);
CHECK_EQ(toString(*tf), "Packed<T, U...>");
CHECK_EQ(toString(*tf, {true}), "{| f: (T, U...) -> (T, U...) |}");
auto ttvA = get<TableType>(requireType("a"));
REQUIRE(ttvA);
CHECK_EQ(toString(requireType("a")), "Packed<number>");
CHECK_EQ(toString(requireType("a"), {true}), "{| f: (number) -> number |}");
REQUIRE(ttvA->instantiatedTypeParams.size() == 1);
REQUIRE(ttvA->instantiatedTypePackParams.size() == 1);
CHECK_EQ(toString(ttvA->instantiatedTypeParams[0], {true}), "number");
CHECK_EQ(toString(ttvA->instantiatedTypePackParams[0], {true}), "");
auto ttvB = get<TableType>(requireType("b"));
REQUIRE(ttvB);
CHECK_EQ(toString(requireType("b")), "Packed<string, number>");
CHECK_EQ(toString(requireType("b"), {true}), "{| f: (string, number) -> (string, number) |}");
REQUIRE(ttvB->instantiatedTypeParams.size() == 1);
REQUIRE(ttvB->instantiatedTypePackParams.size() == 1);
CHECK_EQ(toString(ttvB->instantiatedTypeParams[0], {true}), "string");
CHECK_EQ(toString(ttvB->instantiatedTypePackParams[0], {true}), "number");
auto ttvC = get<TableType>(requireType("c"));
REQUIRE(ttvC);
CHECK_EQ(toString(requireType("c")), "Packed<string, number, boolean>");
CHECK_EQ(toString(requireType("c"), {true}), "{| f: (string, number, boolean) -> (string, number, boolean) |}");
REQUIRE(ttvC->instantiatedTypeParams.size() == 1);
REQUIRE(ttvC->instantiatedTypePackParams.size() == 1);
CHECK_EQ(toString(ttvC->instantiatedTypeParams[0], {true}), "string");
CHECK_EQ(toString(ttvC->instantiatedTypePackParams[0], {true}), "number, boolean");
}
TEST_CASE_FIXTURE(BuiltinsFixture, "type_alias_type_packs_import")
{
fileResolver.source["game/A"] = R"(
export type Packed<T, U...> = { a: T, b: (U...) -> () }
return {}
)";
CheckResult aResult = frontend.check("game/A");
LUAU_REQUIRE_NO_ERRORS(aResult);
CheckResult bResult = check(R"(
local Import = require(game.A)
local a: Import.Packed<number>
local b: Import.Packed<string, number>
local c: Import.Packed<string, number, boolean>
local d: { a: typeof(c) }
)");
LUAU_REQUIRE_NO_ERRORS(bResult);
auto tf = lookupImportedType("Import", "Packed");
REQUIRE(tf);
CHECK_EQ(toString(*tf), "Packed<T, U...>");
CHECK_EQ(toString(*tf, {true}), "{| a: T, b: (U...) -> () |}");
CHECK_EQ(toString(requireType("a"), {true}), "{| a: number, b: () -> () |}");
CHECK_EQ(toString(requireType("b"), {true}), "{| a: string, b: (number) -> () |}");
CHECK_EQ(toString(requireType("c"), {true}), "{| a: string, b: (number, boolean) -> () |}");
CHECK_EQ(toString(requireType("d")), "{| a: Packed<string, number, boolean> |}");
}
TEST_CASE_FIXTURE(BuiltinsFixture, "type_pack_type_parameters")
{
fileResolver.source["game/A"] = R"(
export type Packed<T, U...> = { a: T, b: (U...) -> () }
return {}
)";
CheckResult cResult = check(R"(
local Import = require(game.A)
type Alias<S, T, R...> = Import.Packed<S, (T, R...)>
local a: Alias<string, number, boolean>
type B<X...> = Import.Packed<string, X...>
type C<X...> = Import.Packed<string, (number, X...)>
)");
LUAU_REQUIRE_NO_ERRORS(cResult);
auto tf = lookupType("Alias");
REQUIRE(tf);
CHECK_EQ(toString(*tf), "Alias<S, T, R...>");
CHECK_EQ(toString(*tf, {true}), "{| a: S, b: (T, R...) -> () |}");
CHECK_EQ(toString(requireType("a"), {true}), "{| a: string, b: (number, boolean) -> () |}");
tf = lookupType("B");
REQUIRE(tf);
CHECK_EQ(toString(*tf), "B<X...>");
CHECK_EQ(toString(*tf, {true}), "{| a: string, b: (X...) -> () |}");
tf = lookupType("C");
REQUIRE(tf);
CHECK_EQ(toString(*tf), "C<X...>");
CHECK_EQ(toString(*tf, {true}), "{| a: string, b: (number, X...) -> () |}");
}
TEST_CASE_FIXTURE(Fixture, "type_alias_type_packs_nested")
{
CheckResult result = check(R"(
type Packed1<T...> = (T...) -> (T...)
type Packed2<T...> = (Packed1<T...>, T...) -> (Packed1<T...>, T...)
type Packed3<T...> = (Packed2<T...>, T...) -> (Packed2<T...>, T...)
type Packed4<T...> = (Packed3<T...>, T...) -> (Packed3<T...>, T...)
)");
LUAU_REQUIRE_NO_ERRORS(result);
auto tf = lookupType("Packed4");
REQUIRE(tf);
CHECK_EQ(toString(*tf),
"((((T...) -> (T...), T...) -> ((T...) -> (T...), T...), T...) -> (((T...) -> (T...), T...) -> ((T...) -> (T...), T...), T...), T...) -> "
"((((T...) -> (T...), T...) -> ((T...) -> (T...), T...), T...) -> (((T...) -> (T...), T...) -> ((T...) -> (T...), T...), T...), T...)");
}
TEST_CASE_FIXTURE(Fixture, "type_alias_type_pack_variadic")
{
CheckResult result = check(R"(
type X<T...> = (T...) -> (string, T...)
type D = X<...number>
type E = X<(number, ...string)>
)");
LUAU_REQUIRE_NO_ERRORS(result);
auto d = lookupType("D");
REQUIRE(d);
auto e = lookupType("E");
REQUIRE(e);
CHECK_EQ(toString(*d), "(...number) -> (string, ...number)");
CHECK_EQ(toString(*e), "(number, ...string) -> (string, number, ...string)");
}
TEST_CASE_FIXTURE(Fixture, "type_alias_type_pack_multi")
{
CheckResult result = check(R"(
type Y<T..., U...> = (T...) -> (U...)
type A<S...> = Y<S..., S...>
type B<S...> = Y<(number, ...string), S...>
type Z<T, U...> = (T) -> (U...)
type E<S...> = Z<number, S...>
type F<S...> = Z<number, (string, S...)>
type W<T, U..., V...> = (T, U...) -> (T, V...)
type H<S..., R...> = W<number, S..., R...>
type I<S..., R...> = W<number, (string, S...), R...>
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ(toString(*lookupType("A")), "(S...) -> (S...)");
CHECK_EQ(toString(*lookupType("B")), "(number, ...string) -> (S...)");
CHECK_EQ(toString(*lookupType("E")), "(number) -> (S...)");
CHECK_EQ(toString(*lookupType("F")), "(number) -> (string, S...)");
CHECK_EQ(toString(*lookupType("H")), "(number, S...) -> (number, R...)");
CHECK_EQ(toString(*lookupType("I")), "(number, string, S...) -> (number, R...)");
}
TEST_CASE_FIXTURE(Fixture, "type_alias_type_pack_explicit")
{
CheckResult result = check(R"(
type X<T...> = (T...) -> (T...)
type A<S...> = X<(S...)>
type B = X<()>
type C = X<(number)>
type D = X<(number, string)>
type E = X<(...number)>
type F = X<(string, ...number)>
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ(toString(*lookupType("A")), "(S...) -> (S...)");
CHECK_EQ(toString(*lookupType("B")), "() -> ()");
CHECK_EQ(toString(*lookupType("C")), "(number) -> number");
CHECK_EQ(toString(*lookupType("D")), "(number, string) -> (number, string)");
CHECK_EQ(toString(*lookupType("E")), "(...number) -> (...number)");
CHECK_EQ(toString(*lookupType("F")), "(string, ...number) -> (string, ...number)");
}
TEST_CASE_FIXTURE(Fixture, "type_alias_type_pack_explicit_multi")
{
CheckResult result = check(R"(
type Y<T..., U...> = (T...) -> (U...)
type A = Y<(number, string), (boolean)>
type B = Y<(), ()>
type C<S...> = Y<...string, (number, S...)>
type D<X...> = Y<X..., (number, string, X...)>
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ(toString(*lookupType("A")), "(number, string) -> boolean");
CHECK_EQ(toString(*lookupType("B")), "() -> ()");
CHECK_EQ(toString(*lookupType("C")), "(...string) -> (number, S...)");
CHECK_EQ(toString(*lookupType("D")), "(X...) -> (number, string, X...)");
}
TEST_CASE_FIXTURE(Fixture, "type_alias_type_pack_explicit_multi_tostring")
{
CheckResult result = check(R"(
type Y<T..., U...> = { f: (T...) -> (U...) }
local a: Y<(number, string), (boolean)>
local b: Y<(), ()>
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ(toString(requireType("a")), "Y<(number, string), (boolean)>");
CHECK_EQ(toString(requireType("b")), "Y<(), ()>");
}
TEST_CASE_FIXTURE(Fixture, "type_alias_backwards_compatible")
{
CheckResult result = check(R"(
type X<T> = () -> T
type Y<T, U> = (T) -> U
type A = X<(number)>
type B = Y<(number), (boolean)>
type C = Y<(number), boolean>
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ(toString(*lookupType("A")), "() -> number");
CHECK_EQ(toString(*lookupType("B")), "(number) -> boolean");
CHECK_EQ(toString(*lookupType("C")), "(number) -> boolean");
}
TEST_CASE_FIXTURE(Fixture, "type_alias_type_packs_errors")
{
CheckResult result = check(R"(
type Packed<T, U, V...> = (T, U) -> (V...)
local b: Packed<number>
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
CHECK_EQ(toString(result.errors[0]), "Generic type 'Packed<T, U, V...>' expects at least 2 type arguments, but only 1 is specified");
result = check(R"(
type Packed<T, U> = (T, U) -> ()
type B<X...> = Packed<number, string, X...>
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
CHECK_EQ(toString(result.errors[0]), "Generic type 'Packed<T, U>' expects 0 type pack arguments, but 1 is specified");
result = check(R"(
type Packed<T..., U...> = (T...) -> (U...)
type Other<S...> = Packed<S..., string>
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
CHECK_EQ(toString(result.errors[0]), "Type parameters must come before type pack parameters");
result = check(R"(
type Packed<T, U> = (T) -> U
type Other<S...> = Packed<number, S...>
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
CHECK_EQ(toString(result.errors[0]), "Generic type 'Packed<T, U>' expects 2 type arguments, but only 1 is specified");
result = check(R"(
type Packed<T...> = (T...) -> T...
local a: Packed
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
CHECK_EQ(toString(result.errors[0]), "Type parameter list is required");
result = check(R"(
type Packed<T..., U...> = (T...) -> (U...)
type Other = Packed<>
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
CHECK_EQ(toString(result.errors[0]), "Generic type 'Packed<T..., U...>' expects 2 type pack arguments, but none are specified");
result = check(R"(
type Packed<T..., U...> = (T...) -> (U...)
type Other = Packed<number, string>
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
CHECK_EQ(toString(result.errors[0]), "Generic type 'Packed<T..., U...>' expects 2 type pack arguments, but only 1 is specified");
}
TEST_CASE_FIXTURE(Fixture, "type_alias_default_type_explicit")
{
CheckResult result = check(R"(
type Y<T, U = string> = { a: T, b: U }
local a: Y<number, number> = { a = 2, b = 3 }
local b: Y<number> = { a = 2, b = "s" }
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ(toString(requireType("a")), "Y<number, number>");
CHECK_EQ(toString(requireType("b")), "Y<number, string>");
result = check(R"(
type Y<T = string> = { a: T }
local a: Y<number> = { a = 2 }
local b: Y<> = { a = "s" }
local c: Y = { a = "s" }
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ(toString(requireType("a")), "Y<number>");
CHECK_EQ(toString(requireType("b")), "Y<string>");
CHECK_EQ(toString(requireType("c")), "Y<string>");
}
TEST_CASE_FIXTURE(Fixture, "type_alias_default_type_self")
{
CheckResult result = check(R"(
type Y<T, U = T> = { a: T, b: U }
local a: Y<number> = { a = 2, b = 3 }
local b: Y<string> = { a = "h", b = "s" }
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ(toString(requireType("a")), "Y<number, number>");
CHECK_EQ(toString(requireType("b")), "Y<string, string>");
result = check(R"(
type Y<T, U = (T, T) -> string> = { a: T, b: U }
local a: Y<number>
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ(toString(requireType("a")), "Y<number, (number, number) -> string>");
}
TEST_CASE_FIXTURE(Fixture, "type_alias_default_type_chained")
{
CheckResult result = check(R"(
type Y<T, U = T, V = U> = { a: T, b: U, c: V }
local a: Y<number>
local b: Y<number, string>
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ(toString(requireType("a")), "Y<number, number, number>");
CHECK_EQ(toString(requireType("b")), "Y<number, string, string>");
}
TEST_CASE_FIXTURE(Fixture, "type_alias_default_type_pack_explicit")
{
CheckResult result = check(R"(
type Y<T... = (string, number)> = { a: (T...) -> () }
local a: Y<>
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ(toString(requireType("a")), "Y<string, number>");
}
TEST_CASE_FIXTURE(Fixture, "type_alias_default_type_pack_self_ty")
{
CheckResult result = check(R"(
type Y<T, U... = ...T> = { a: T, b: (U...) -> T }
local a: Y<number>
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ(toString(requireType("a")), "Y<number, ...number>");
}
TEST_CASE_FIXTURE(Fixture, "type_alias_default_type_pack_self_tp")
{
CheckResult result = check(R"(
type Y<T..., U... = T...> = { a: (T...) -> U... }
local a: Y<number, string>
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ(toString(requireType("a")), "Y<(number, string), (number, string)>");
}
TEST_CASE_FIXTURE(Fixture, "type_alias_default_type_pack_self_chained_tp")
{
CheckResult result = check(R"(
type Y<T..., U... = T..., V... = U...> = { a: (T...) -> U..., b: (T...) -> V... }
local a: Y<number, string>
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ(toString(requireType("a")), "Y<(number, string), (number, string), (number, string)>");
}
TEST_CASE_FIXTURE(Fixture, "type_alias_default_mixed_self")
{
CheckResult result = check(R"(
type Y<T, U = T, V... = ...number, W... = (T, U, V...)> = { a: (T, U, V...) -> W... }
local a: Y<number>
local b: Y<number, string>
local c: Y<number, string, ...boolean>
local d: Y<number, string, ...boolean, ...() -> ()>
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ(toString(requireType("a")), "Y<number, number, ...number, (number, number, ...number)>");
CHECK_EQ(toString(requireType("b")), "Y<number, string, ...number, (number, string, ...number)>");
CHECK_EQ(toString(requireType("c")), "Y<number, string, ...boolean, (number, string, ...boolean)>");
CHECK_EQ(toString(requireType("d")), "Y<number, string, ...boolean, ...() -> ()>");
}
TEST_CASE_FIXTURE(Fixture, "type_alias_default_type_errors")
{
CheckResult result = check(R"(
type Y<T = T> = { a: T }
local a: Y = { a = 2 }
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
CHECK_EQ(toString(result.errors[0]), "Unknown type 'T'");
result = check(R"(
type Y<T... = T...> = { a: (T...) -> () }
local a: Y<>
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
CHECK_EQ(toString(result.errors[0]), "Unknown type 'T'");
result = check(R"(
type Y<T = string, U... = ...string> = { a: (T) -> U... }
local a: Y<...number>
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
CHECK_EQ(toString(result.errors[0]), "Generic type 'Y<T, U...>' expects at least 1 type argument, but none are specified");
result = check(R"(
type Packed<T> = (T) -> T
local a: Packed
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
CHECK_EQ(toString(result.errors[0]), "Type parameter list is required");
result = check(R"(
type Y<T, U = T, V> = { a: T }
local a: Y<number>
)");
LUAU_REQUIRE_ERRORS(result);
result = check(R"(
type Y<T..., U... = T..., V...> = { a: T }
local a: Y<...number>
)");
LUAU_REQUIRE_ERRORS(result);
}
TEST_CASE_FIXTURE(BuiltinsFixture, "type_alias_default_export")
{
fileResolver.source["Module/Types"] = R"(
export type A<T, U = string> = { a: T, b: U }
export type B<T, U = T> = { a: T, b: U }
export type C<T, U = (T, T) -> string> = { a: T, b: U }
export type D<T, U = T, V = U> = { a: T, b: U, c: V }
export type E<T... = (string, number)> = { a: (T...) -> () }
export type F<T, U... = ...T> = { a: T, b: (U...) -> T }
export type G<T..., U... = ()> = { b: (U...) -> T... }
export type H<T... = ()> = { b: (T...) -> T... }
return {}
)";
CheckResult resultTypes = frontend.check("Module/Types");
LUAU_REQUIRE_NO_ERRORS(resultTypes);
fileResolver.source["Module/Users"] = R"(
local Types = require(script.Parent.Types)
local a: Types.A<number>
local b: Types.B<number>
local c: Types.C<number>
local d: Types.D<number>
local e: Types.E<>
local eVoid: Types.E<()>
local f: Types.F<number>
local g: Types.G<...number>
local h: Types.H<>
)";
CheckResult resultUsers = frontend.check("Module/Users");
LUAU_REQUIRE_NO_ERRORS(resultUsers);
CHECK_EQ(toString(requireType("Module/Users", "a")), "A<number, string>");
CHECK_EQ(toString(requireType("Module/Users", "b")), "B<number, number>");
CHECK_EQ(toString(requireType("Module/Users", "c")), "C<number, (number, number) -> string>");
CHECK_EQ(toString(requireType("Module/Users", "d")), "D<number, number, number>");
CHECK_EQ(toString(requireType("Module/Users", "e")), "E<string, number>");
CHECK_EQ(toString(requireType("Module/Users", "eVoid")), "E<>");
CHECK_EQ(toString(requireType("Module/Users", "f")), "F<number, ...number>");
CHECK_EQ(toString(requireType("Module/Users", "g")), "G<...number, ()>");
CHECK_EQ(toString(requireType("Module/Users", "h")), "H<>");
}
TEST_CASE_FIXTURE(Fixture, "type_alias_default_type_skip_brackets")
{
CheckResult result = check(R"(
type Y<T... = ...string> = (T...) -> number
local a: Y
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ(toString(requireType("a")), "(...string) -> number");
}
TEST_CASE_FIXTURE(Fixture, "type_alias_defaults_confusing_types")
{
CheckResult result = check(R"(
type A<T, U = T, V... = ...any, W... = V...> = (T, V...) -> (U, W...)
type B = A<string, (number)>
type C = A<string, (number), (boolean)>
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ(toString(*lookupType("B"), {true}), "(string, ...any) -> (number, ...any)");
CHECK_EQ(toString(*lookupType("C"), {true}), "(string, boolean) -> (number, boolean)");
}
TEST_CASE_FIXTURE(Fixture, "type_alias_defaults_recursive_type")
{
CheckResult result = check(R"(
type F<K = string, V = (K) -> ()> = (K) -> V
type R = { m: F<R> }
)");
LUAU_REQUIRE_NO_ERRORS(result);
CHECK_EQ(toString(*lookupType("R"), {true}), "t1 where t1 = {| m: (t1) -> (t1) -> () |}");
}
TEST_CASE_FIXTURE(Fixture, "pack_tail_unification_check")
{
CheckResult result = check(R"(
local a: () -> (number, ...string)
local b: () -> (number, ...boolean)
a = b
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
CHECK_EQ(toString(result.errors[0]), R"(Type '() -> (number, ...boolean)' could not be converted into '() -> (number, ...string)'
caused by:
Type 'boolean' could not be converted into 'string')");
}
// TODO: File a Jira about this
/*
TEST_CASE_FIXTURE(Fixture, "unifying_vararg_pack_with_fixed_length_pack_produces_fixed_length_pack")
{
CheckResult result = check(R"(
function a(x) return 1 end
a(...)
)");
LUAU_REQUIRE_NO_ERRORS(result);
ModulePtr mainModule = getMainModule();
REQUIRE(mainModule);
REQUIRE(mainModule->hasModuleScope());
REQUIRE(bool(mainModule->getModuleScope()->varargPack));
TypePackId varargPack = *mainModule->getModuleScope()->varargPack;
auto iter = begin(varargPack);
auto endIter = end(varargPack);
CHECK(iter != endIter);
++iter;
CHECK(iter == endIter);
CHECK(!iter.tail());
}
*/
TEST_CASE_FIXTURE(Fixture, "dont_ice_if_a_TypePack_is_an_error")
{
CheckResult result = check(R"(
--!strict
function f(s)
print(s)
return f
end
f("foo")("bar")
)");
}
TEST_CASE_FIXTURE(Fixture, "cyclic_type_packs")
{
// this has a risk of creating cyclic type packs, causing infinite loops / OOMs
check(R"(
--!nonstrict
_ += _(_,...)
repeat
_ += _(...)
until ... + _
)");
check(R"(
--!nonstrict
_ += _(_(...,...),_(...))
repeat
until _
)");
}
TEST_CASE_FIXTURE(BuiltinsFixture, "detect_cyclic_typepacks")
{
CheckResult result = check(R"(
type ( ... ) ( ) ;
( ... ) ( - - ... ) ( - ... )
type = ( ... ) ;
( ... ) ( ) ( ... ) ;
( ... ) ""
)");
LUAU_REQUIRE_ERRORS(result);
}
TEST_CASE_FIXTURE(BuiltinsFixture, "detect_cyclic_typepacks2")
{
CheckResult result = check(R"(
function _(l0:((typeof((pcall)))|((((t0)->())|(typeof(-67108864)))|(any)))|(any),...):(((typeof(0))|(any))|(any),typeof(-67108864),any)
xpcall(_,_,_)
_(_,_,_)
end
)");
LUAU_REQUIRE_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "unify_variadic_tails_in_arguments")
{
CheckResult result = check(R"(
function foo(...: string): number
return 1
end
function bar(...: number): number
return foo(...)
end
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
CHECK_EQ(toString(result.errors[0]), "Type 'number' could not be converted into 'string'");
}
TEST_CASE_FIXTURE(Fixture, "unify_variadic_tails_in_arguments_free")
{
CheckResult result = check(R"(
function foo<T...>(...: T...): T...
return ...
end
function bar(...: number): boolean
return foo(...)
end
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
CHECK_EQ(toString(result.errors[0]), "Type 'number' could not be converted into 'boolean'");
}
TEST_CASE_FIXTURE(BuiltinsFixture, "type_packs_with_tails_in_vararg_adjustment")
{
std::optional<ScopedFastFlag> sff;
if (FFlag::DebugLuauDeferredConstraintResolution)
sff = {"LuauInstantiateInSubtyping", true};
CheckResult result = check(R"(
local function wrapReject<TArg, TResult>(fn: (self: any, ...TArg) -> ...TResult): (self: any, ...TArg) -> ...TResult
return function(self, ...)
local arguments = { ... }
local ok, result = pcall(function()
return fn(self, table.unpack(arguments))
end)
return result
end
end
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(BuiltinsFixture, "generalize_expectedTypes_with_proper_scope")
{
ScopedFastFlag sff[] = {
{"DebugLuauDeferredConstraintResolution", true},
{"LuauInstantiateInSubtyping", true},
};
CheckResult result = check(R"(
local function f<TResult>(fn: () -> ...TResult): () -> ...TResult
return function()
end
end
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "fuzz_typepack_iter_follow")
{
CheckResult result = check(R"(
local _
local _ = _,_(),_(_)
)");
LUAU_REQUIRE_ERRORS(result);
}
TEST_CASE_FIXTURE(BuiltinsFixture, "fuzz_typepack_iter_follow_2")
{
CheckResult result = check(R"(
function test(name, searchTerm)
local found = string.find(name:lower(), searchTerm:lower())
end
)");
LUAU_REQUIRE_NO_ERRORS(result);
}
TEST_CASE_FIXTURE(Fixture, "type_param_overflow")
{
CheckResult result = check(R"(
type Two<T,U> = { a: T, b: U }
local x: Two<number, string, number> = { a = 1, b = 'c' }
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
}
TEST_SUITE_END();
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