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Analysis: Make typeof on a type userdata return "type"

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This change introduces a flag (LuauUserTypeFunTypeofReturnsType) that, when enabled, sets __type on the type userdata's metatable to "type".
This behaviour was described in the user-defined type function RFC (https://rfcs.luau.org/user-defined-type-functions.html), but seems to have been missed; this change implements that behaviour.
This commit is contained in:
nothing1649 2024-12-16 11:02:52 +11:00
parent 2e6fdd90a0
commit 43c03168ea
2 changed files with 27 additions and 0 deletions
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7
Analysis/src/TypeFunctionRuntime.cpp
View file

@ -17,6 +17,7 @@ LUAU_DYNAMIC_FASTINT(LuauTypeFunctionSerdeIterationLimit)
LUAU_FASTFLAGVARIABLE(LuauUserTypeFunPrintToError)
LUAU_FASTFLAGVARIABLE(LuauUserTypeFunFixNoReadWrite)
LUAU_FASTFLAGVARIABLE(LuauUserTypeFunThreadBuffer)
LUAU_FASTFLAGVARIABLE(LuauUserTypeFunTypeofReturnsType)
namespace Luau
{
@ -1504,6 +1505,12 @@ void registerTypeUserData(lua_State* L)
// Create and register metatable for type userdata
luaL_newmetatable(L, "type");
if (FFlag::LuauUserTypeFunTypeofReturnsType)
{
lua_pushstring(L, "type");
lua_setfield(L, -2, "__type");
}
// Protect metatable from being changed
lua_pushstring(L, "The metatable is locked");

20
tests/TypeFunction.user.test.cpp
View file

@ -14,6 +14,7 @@ LUAU_FASTFLAG(LuauUserTypeFunExportedAndLocal)
LUAU_FASTFLAG(LuauUserDefinedTypeFunParseExport)
LUAU_FASTFLAG(LuauUserTypeFunThreadBuffer)
LUAU_FASTFLAG(LuauUserTypeFunUpdateAllEnvs)
LUAU_FASTFLAG(LuauUserTypeFunTypeofReturnsType)
TEST_SUITE_BEGIN("UserDefinedTypeFunctionTests");
@ -1393,4 +1394,23 @@ TEST_CASE_FIXTURE(BuiltinsFixture, "print_to_error_plus_no_result")
CHECK(toString(result.errors[3]) == R"(Type function instance t0<string> is uninhabited)");
}
TEST_CASE_FIXTURE(BuiltinsFixture, "typeof_type_userdata_returns_type")
{
ScopedFastFlag solverV2{FFlag::LuauSolverV2, true};
ScopedFastFlag luauUserTypeFunPrintToError{FFlag::LuauUserTypeFunPrintToError, true};
ScopedFastFlag luauUserTypeFunTypeofReturnsType{FFlag::LuauUserTypeFunTypeofReturnsType, true};
CheckResult result = check(R"(
type function test(t)
print(typeof(t))
return t
end
local _:test<number>
)");
LUAU_REQUIRE_ERROR_COUNT(1, result);
CHECK(toString(result.errors[0]) == R"(type)");
}
TEST_SUITE_END();