1088 lines
31 KiB
C++
1088 lines
31 KiB
C++
// This file is part of the Luau programming language and is licensed under MIT License; see LICENSE.txt for details
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#include "Luau/Scope.h"
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#include "Luau/TypeInfer.h"
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#include "Fixture.h"
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#include "doctest.h"
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LUAU_FASTFLAG(LuauWeakEqConstraint)
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LUAU_FASTFLAG(LuauQuantifyInPlace2)
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using namespace Luau;
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TEST_SUITE_BEGIN("RefinementTest");
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TEST_CASE_FIXTURE(Fixture, "is_truthy_constraint")
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{
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CheckResult result = check(R"(
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function f(v: string?)
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if v then
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local s = v
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else
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local s = v
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end
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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CHECK_EQ("string", toString(requireTypeAtPosition({3, 26})));
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CHECK_EQ("nil", toString(requireTypeAtPosition({5, 26})));
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}
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TEST_CASE_FIXTURE(Fixture, "invert_is_truthy_constraint")
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{
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CheckResult result = check(R"(
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function f(v: string?)
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if not v then
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local s = v
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else
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local s = v
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end
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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CHECK_EQ("nil", toString(requireTypeAtPosition({3, 26})));
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CHECK_EQ("string", toString(requireTypeAtPosition({5, 26})));
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}
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TEST_CASE_FIXTURE(Fixture, "parenthesized_expressions_are_followed_through")
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{
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CheckResult result = check(R"(
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function f(v: string?)
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if (not v) then
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local s = v
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else
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local s = v
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end
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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CHECK_EQ("nil", toString(requireTypeAtPosition({3, 26})));
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CHECK_EQ("string", toString(requireTypeAtPosition({5, 26})));
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}
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TEST_CASE_FIXTURE(Fixture, "and_constraint")
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{
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CheckResult result = check(R"(
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function f(a: string?, b: number?)
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if a and b then
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local x = a
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local y = b
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else
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local x = a
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local y = b
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end
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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CHECK_EQ("string", toString(requireTypeAtPosition({3, 26})));
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CHECK_EQ("number", toString(requireTypeAtPosition({4, 26})));
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CHECK_EQ("string?", toString(requireTypeAtPosition({6, 26})));
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CHECK_EQ("number?", toString(requireTypeAtPosition({7, 26})));
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}
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TEST_CASE_FIXTURE(Fixture, "not_and_constraint")
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{
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CheckResult result = check(R"(
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function f(a: string?, b: number?)
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if not (a and b) then
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local x = a
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local y = b
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else
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local x = a
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local y = b
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end
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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CHECK_EQ("string?", toString(requireTypeAtPosition({3, 26})));
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CHECK_EQ("number?", toString(requireTypeAtPosition({4, 26})));
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CHECK_EQ("string", toString(requireTypeAtPosition({6, 26})));
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CHECK_EQ("number", toString(requireTypeAtPosition({7, 26})));
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}
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TEST_CASE_FIXTURE(Fixture, "or_predicate_with_truthy_predicates")
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{
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CheckResult result = check(R"(
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function f(a: string?, b: number?)
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if a or b then
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local x = a
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local y = b
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else
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local x = a
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local y = b
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end
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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CHECK_EQ("string?", toString(requireTypeAtPosition({3, 26})));
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CHECK_EQ("number?", toString(requireTypeAtPosition({4, 26})));
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CHECK_EQ("nil", toString(requireTypeAtPosition({6, 26})));
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CHECK_EQ("nil", toString(requireTypeAtPosition({7, 26})));
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}
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TEST_CASE_FIXTURE(Fixture, "type_assertion_expr_carry_its_constraints")
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{
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CheckResult result = check(R"(
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function g(a: number?, b: string?)
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if (a :: any) and (b :: any) then
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local x = a
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local y = b
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end
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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CHECK_EQ("number", toString(requireTypeAtPosition({3, 26})));
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CHECK_EQ("string", toString(requireTypeAtPosition({4, 26})));
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}
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TEST_CASE_FIXTURE(Fixture, "typeguard_in_if_condition_position")
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{
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CheckResult result = check(R"(
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function f(s: any)
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if type(s) == "number" then
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local n = s
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end
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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CHECK_EQ("number", toString(requireTypeAtPosition({3, 26})));
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}
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TEST_CASE_FIXTURE(Fixture, "typeguard_in_assert_position")
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{
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CheckResult result = check(R"(
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local a
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assert(type(a) == "number")
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local b = a
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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REQUIRE_EQ("number", toString(requireType("b")));
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}
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TEST_CASE_FIXTURE(Fixture, "typeguard_only_look_up_types_from_global_scope")
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{
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CheckResult result = check(R"(
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type ActuallyString = string
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do -- Necessary. Otherwise toposort has ActuallyString come after string type alias.
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type string = number
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local foo: string = 1
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if type(foo) == "string" then
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local bar: ActuallyString = foo
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local baz: boolean = foo
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end
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end
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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CHECK_EQ("Type 'number' has no overlap with 'string'", toString(result.errors[0]));
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}
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TEST_CASE_FIXTURE(Fixture, "call_a_more_specific_function_using_typeguard")
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{
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CheckResult result = check(R"(
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local function f(x: number)
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return x
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end
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local function g(x: any)
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if type(x) == "string" then
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f(x)
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end
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end
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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CHECK_EQ("Type 'string' could not be converted into 'number'", toString(result.errors[0]));
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}
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TEST_CASE_FIXTURE(Fixture, "impossible_type_narrow_is_not_an_error")
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{
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// This unit test serves as a reminder to not implement this warning until Luau is intelligent enough.
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// For instance, getting a value out of the indexer and checking whether the value exists is not an error.
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CheckResult result = check(R"(
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local t: {string} = {"a", "b", "c"}
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local v = t[4]
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if not v then
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t[4] = "d"
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else
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print(v)
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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}
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TEST_CASE_FIXTURE(Fixture, "truthy_constraint_on_properties")
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{
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CheckResult result = check(R"(
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local t: {x: number?} = {x = 1}
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if t.x then
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local foo: number = t.x
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end
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local bar = t.x
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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CHECK_EQ("number?", toString(requireType("bar")));
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}
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TEST_CASE_FIXTURE(Fixture, "index_on_a_refined_property")
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{
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CheckResult result = check(R"(
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local t: {x: {y: string}?} = {x = {y = "hello!"}}
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if t.x then
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print(t.x.y)
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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}
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TEST_CASE_FIXTURE(Fixture, "assert_non_binary_expressions_actually_resolve_constraints")
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{
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CheckResult result = check(R"(
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local foo: string? = "hello"
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assert(foo)
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local bar: string = foo
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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}
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TEST_CASE_FIXTURE(Fixture, "assign_table_with_refined_property_with_a_similar_type_is_illegal")
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{
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ScopedFastFlag luauTableSubtypingVariance{"LuauTableSubtypingVariance", true};
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ScopedFastFlag luauExtendedTypeMismatchError{"LuauExtendedTypeMismatchError", true};
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CheckResult result = check(R"(
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local t: {x: number?} = {x = nil}
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if t.x then
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local u: {x: number} = t
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end
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)");
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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CHECK_EQ(R"(Type '{| x: number? |}' could not be converted into '{| x: number |}'
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caused by:
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Property 'x' is not compatible. Type 'number?' could not be converted into 'number')",
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toString(result.errors[0]));
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}
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TEST_CASE_FIXTURE(Fixture, "lvalue_is_equal_to_another_lvalue")
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{
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ScopedFastFlag sff1{"LuauEqConstraint", true};
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CheckResult result = check(R"(
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local function f(a: (string | number)?, b: boolean?)
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if a == b then
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local foo, bar = a, b
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else
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local foo, bar = a, b
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end
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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if (FFlag::LuauWeakEqConstraint)
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{
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CHECK_EQ(toString(requireTypeAtPosition({3, 33})), "(number | string)?"); // a == b
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CHECK_EQ(toString(requireTypeAtPosition({3, 36})), "boolean?"); // a == b
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CHECK_EQ(toString(requireTypeAtPosition({5, 33})), "(number | string)?"); // a ~= b
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CHECK_EQ(toString(requireTypeAtPosition({5, 36})), "boolean?"); // a ~= b
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}
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else
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{
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CHECK_EQ(toString(requireTypeAtPosition({3, 33})), "nil"); // a == b
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CHECK_EQ(toString(requireTypeAtPosition({3, 36})), "nil"); // a == b
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CHECK_EQ(toString(requireTypeAtPosition({5, 33})), "(number | string)?"); // a ~= b
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CHECK_EQ(toString(requireTypeAtPosition({5, 36})), "boolean?"); // a ~= b
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}
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}
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TEST_CASE_FIXTURE(Fixture, "lvalue_is_equal_to_a_term")
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{
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ScopedFastFlag sff1{"LuauEqConstraint", true};
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CheckResult result = check(R"(
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local function f(a: (string | number)?)
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if a == 1 then
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local foo = a
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else
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local foo = a
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end
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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if (FFlag::LuauWeakEqConstraint)
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{
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CHECK_EQ(toString(requireTypeAtPosition({3, 28})), "(number | string)?"); // a == 1
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CHECK_EQ(toString(requireTypeAtPosition({5, 28})), "(number | string)?"); // a ~= 1
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}
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else
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{
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CHECK_EQ(toString(requireTypeAtPosition({3, 28})), "number"); // a == 1
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CHECK_EQ(toString(requireTypeAtPosition({5, 28})), "(number | string)?"); // a ~= 1
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}
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}
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TEST_CASE_FIXTURE(Fixture, "term_is_equal_to_an_lvalue")
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{
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ScopedFastFlag sff1{"LuauEqConstraint", true};
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CheckResult result = check(R"(
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local function f(a: (string | number)?)
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if "hello" == a then
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local foo = a
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else
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local foo = a
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end
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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if (FFlag::LuauWeakEqConstraint)
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{
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CHECK_EQ(toString(requireTypeAtPosition({3, 28})), "(number | string)?"); // a == "hello"
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CHECK_EQ(toString(requireTypeAtPosition({5, 28})), "(number | string)?"); // a ~= "hello"
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}
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else
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{
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CHECK_EQ(toString(requireTypeAtPosition({3, 28})), "string"); // a == "hello"
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CHECK_EQ(toString(requireTypeAtPosition({5, 28})), "(number | string)?"); // a ~= "hello"
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}
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}
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TEST_CASE_FIXTURE(Fixture, "lvalue_is_not_nil")
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{
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ScopedFastFlag sff1{"LuauEqConstraint", true};
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CheckResult result = check(R"(
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local function f(a: (string | number)?)
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if a ~= nil then
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local foo = a
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else
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local foo = a
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end
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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if (FFlag::LuauWeakEqConstraint)
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{
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CHECK_EQ(toString(requireTypeAtPosition({3, 28})), "number | string"); // a ~= nil
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CHECK_EQ(toString(requireTypeAtPosition({5, 28})), "(number | string)?"); // a == nil
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}
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else
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{
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CHECK_EQ(toString(requireTypeAtPosition({3, 28})), "number | string"); // a ~= nil
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CHECK_EQ(toString(requireTypeAtPosition({5, 28})), "nil"); // a == nil
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}
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}
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TEST_CASE_FIXTURE(Fixture, "free_type_is_equal_to_an_lvalue")
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{
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ScopedFastFlag sff1{"LuauEqConstraint", true};
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CheckResult result = check(R"(
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local function f(a, b: string?)
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if a == b then
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local foo, bar = a, b
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end
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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if (FFlag::LuauWeakEqConstraint)
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{
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CHECK_EQ(toString(requireTypeAtPosition({3, 33})), "a"); // a == b
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CHECK_EQ(toString(requireTypeAtPosition({3, 36})), "string?"); // a == b
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}
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else
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{
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CHECK_EQ(toString(requireTypeAtPosition({3, 33})), "string?"); // a == b
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CHECK_EQ(toString(requireTypeAtPosition({3, 36})), "string?"); // a == b
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}
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}
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TEST_CASE_FIXTURE(Fixture, "unknown_lvalue_is_not_synonymous_with_other_on_not_equal")
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{
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ScopedFastFlag sff1{"LuauEqConstraint", true};
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CheckResult result = check(R"(
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local function f(a: any, b: {x: number}?)
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if a ~= b then
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local foo, bar = a, b
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end
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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if (FFlag::LuauWeakEqConstraint)
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{
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CHECK_EQ(toString(requireTypeAtPosition({3, 33})), "any"); // a ~= b
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CHECK_EQ(toString(requireTypeAtPosition({3, 36})), "{| x: number |}?"); // a ~= b
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}
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else
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{
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CHECK_EQ(toString(requireTypeAtPosition({3, 33})), "any"); // a ~= b
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CHECK_EQ(toString(requireTypeAtPosition({3, 36})), "{| x: number |}"); // a ~= b
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}
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}
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TEST_CASE_FIXTURE(Fixture, "string_not_equal_to_string_or_nil")
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{
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ScopedFastFlag sff1{"LuauEqConstraint", true};
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CheckResult result = check(R"(
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local t: {string} = {"hello"}
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local a: string = t[1]
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local b: string? = nil
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if a ~= b then
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local foo, bar = a, b
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else
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local foo, bar = a, b
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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CHECK_EQ(toString(requireTypeAtPosition({6, 29})), "string"); // a ~= b
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CHECK_EQ(toString(requireTypeAtPosition({6, 32})), "string?"); // a ~= b
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if (FFlag::LuauWeakEqConstraint)
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{
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CHECK_EQ(toString(requireTypeAtPosition({8, 29})), "string"); // a == b
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CHECK_EQ(toString(requireTypeAtPosition({8, 32})), "string?"); // a == b
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}
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else
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{
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// This is technically not wrong, but it's also wrong at the same time.
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// The refinement code is none the wiser about the fact we pulled a string out of an array, so it has no choice but to narrow as just string.
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CHECK_EQ(toString(requireTypeAtPosition({8, 29})), "string"); // a == b
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CHECK_EQ(toString(requireTypeAtPosition({8, 32})), "string"); // a == b
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}
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}
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TEST_CASE_FIXTURE(Fixture, "narrow_property_of_a_bounded_variable")
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{
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CheckResult result = check(R"(
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local t
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local u: {x: number?} = {x = nil}
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t = u
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if t.x then
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local foo: number = t.x
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end
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)");
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LUAU_REQUIRE_NO_ERRORS(result);
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}
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TEST_CASE_FIXTURE(Fixture, "type_narrow_to_vector")
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{
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|
CheckResult result = check(R"(
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|
local function f(x)
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if type(x) == "vector" then
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local foo = x
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end
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end
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)");
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// This is kinda weird to see, but this actually only happens in Luau without Roblox type bindings because we don't have a Vector3 type.
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LUAU_REQUIRE_ERROR_COUNT(1, result);
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CHECK_EQ("Unknown type 'Vector3'", toString(result.errors[0]));
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CHECK_EQ("*unknown*", toString(requireTypeAtPosition({3, 28})));
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}
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TEST_CASE_FIXTURE(Fixture, "nonoptional_type_can_narrow_to_nil_if_sense_is_true")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local t = {"hello"}
|
|
local v = t[2]
|
|
if type(v) == "nil" then
|
|
local foo = v
|
|
else
|
|
local foo = v
|
|
end
|
|
|
|
if not (type(v) ~= "nil") then
|
|
local foo = v
|
|
else
|
|
local foo = v
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
CHECK_EQ("nil", toString(requireTypeAtPosition({4, 24}))); // type(v) == "nil"
|
|
CHECK_EQ("string", toString(requireTypeAtPosition({6, 24}))); // type(v) ~= "nil"
|
|
|
|
CHECK_EQ("nil", toString(requireTypeAtPosition({10, 24}))); // equivalent to type(v) == "nil"
|
|
CHECK_EQ("string", toString(requireTypeAtPosition({12, 24}))); // equivalent to type(v) ~= "nil"
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "typeguard_not_to_be_string")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local function f(x: string | number | boolean)
|
|
if type(x) ~= "string" then
|
|
local foo = x
|
|
else
|
|
local foo = x
|
|
end
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
CHECK_EQ("boolean | number", toString(requireTypeAtPosition({3, 28}))); // type(x) ~= "string"
|
|
CHECK_EQ("string", toString(requireTypeAtPosition({5, 28}))); // type(x) == "string"
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "typeguard_narrows_for_table")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local function f(x: string | {x: number} | {y: boolean})
|
|
if type(x) == "table" then
|
|
local foo = x
|
|
else
|
|
local foo = x
|
|
end
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
CHECK_EQ("{| x: number |} | {| y: boolean |}", toString(requireTypeAtPosition({3, 28}))); // type(x) == "table"
|
|
CHECK_EQ("string", toString(requireTypeAtPosition({5, 28}))); // type(x) ~= "table"
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "typeguard_narrows_for_functions")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local function weird(x: string | ((number) -> string))
|
|
if type(x) == "function" then
|
|
local foo = x
|
|
else
|
|
local foo = x
|
|
end
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
CHECK_EQ("(number) -> string", toString(requireTypeAtPosition({3, 28}))); // type(x) == "function"
|
|
CHECK_EQ("string", toString(requireTypeAtPosition({5, 28}))); // type(x) ~= "function"
|
|
}
|
|
|
|
namespace
|
|
{
|
|
std::optional<ExprResult<TypePackId>> magicFunctionInstanceIsA(
|
|
TypeChecker& typeChecker, const ScopePtr& scope, const AstExprCall& expr, ExprResult<TypePackId> exprResult)
|
|
{
|
|
if (expr.args.size != 1)
|
|
return std::nullopt;
|
|
|
|
auto index = expr.func->as<Luau::AstExprIndexName>();
|
|
auto str = expr.args.data[0]->as<Luau::AstExprConstantString>();
|
|
if (!index || !str)
|
|
return std::nullopt;
|
|
|
|
std::optional<LValue> lvalue = tryGetLValue(*index->expr);
|
|
std::optional<TypeFun> tfun = scope->lookupType(std::string(str->value.data, str->value.size));
|
|
if (!lvalue || !tfun)
|
|
return std::nullopt;
|
|
|
|
unfreeze(typeChecker.globalTypes);
|
|
TypePackId booleanPack = typeChecker.globalTypes.addTypePack({typeChecker.booleanType});
|
|
freeze(typeChecker.globalTypes);
|
|
return ExprResult<TypePackId>{booleanPack, {IsAPredicate{std::move(*lvalue), expr.location, tfun->type}}};
|
|
}
|
|
|
|
struct RefinementClassFixture : Fixture
|
|
{
|
|
RefinementClassFixture()
|
|
{
|
|
TypeArena& arena = typeChecker.globalTypes;
|
|
|
|
unfreeze(arena);
|
|
TypeId vec3 = arena.addType(ClassTypeVar{"Vector3", {}, std::nullopt, std::nullopt, {}, nullptr});
|
|
getMutable<ClassTypeVar>(vec3)->props = {
|
|
{"X", Property{typeChecker.numberType}},
|
|
{"Y", Property{typeChecker.numberType}},
|
|
{"Z", Property{typeChecker.numberType}},
|
|
};
|
|
|
|
TypeId inst = arena.addType(ClassTypeVar{"Instance", {}, std::nullopt, std::nullopt, {}, nullptr});
|
|
|
|
TypePackId isAParams = arena.addTypePack({inst, typeChecker.stringType});
|
|
TypePackId isARets = arena.addTypePack({typeChecker.booleanType});
|
|
TypeId isA = arena.addType(FunctionTypeVar{isAParams, isARets});
|
|
getMutable<FunctionTypeVar>(isA)->magicFunction = magicFunctionInstanceIsA;
|
|
|
|
getMutable<ClassTypeVar>(inst)->props = {
|
|
{"Name", Property{typeChecker.stringType}},
|
|
{"IsA", Property{isA}},
|
|
};
|
|
|
|
TypeId folder = typeChecker.globalTypes.addType(ClassTypeVar{"Folder", {}, inst, std::nullopt, {}, nullptr});
|
|
TypeId part = typeChecker.globalTypes.addType(ClassTypeVar{"Part", {}, inst, std::nullopt, {}, nullptr});
|
|
getMutable<ClassTypeVar>(part)->props = {
|
|
{"Position", Property{vec3}},
|
|
};
|
|
|
|
typeChecker.globalScope->exportedTypeBindings["Vector3"] = TypeFun{{}, vec3};
|
|
typeChecker.globalScope->exportedTypeBindings["Instance"] = TypeFun{{}, inst};
|
|
typeChecker.globalScope->exportedTypeBindings["Folder"] = TypeFun{{}, folder};
|
|
typeChecker.globalScope->exportedTypeBindings["Part"] = TypeFun{{}, part};
|
|
freeze(typeChecker.globalTypes);
|
|
}
|
|
};
|
|
} // namespace
|
|
|
|
TEST_CASE_FIXTURE(RefinementClassFixture, "typeguard_cast_free_table_to_vector")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local function f(vec)
|
|
local X, Y, Z = vec.X, vec.Y, vec.Z
|
|
|
|
if type(vec) == "vector" then
|
|
local foo = vec
|
|
elseif typeof(vec) == "Instance" then
|
|
local foo = vec
|
|
else
|
|
local foo = vec
|
|
end
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_ERROR_COUNT(1, result);
|
|
|
|
CHECK_EQ("Vector3", toString(requireTypeAtPosition({5, 28}))); // type(vec) == "vector"
|
|
|
|
if (FFlag::LuauQuantifyInPlace2)
|
|
CHECK_EQ("Type '{+ X: a, Y: b, Z: c +}' could not be converted into 'Instance'", toString(result.errors[0]));
|
|
else
|
|
CHECK_EQ("Type '{- X: a, Y: b, Z: c -}' could not be converted into 'Instance'", toString(result.errors[0]));
|
|
CHECK_EQ("*unknown*", toString(requireTypeAtPosition({7, 28}))); // typeof(vec) == "Instance"
|
|
|
|
if (FFlag::LuauQuantifyInPlace2)
|
|
CHECK_EQ("{+ X: a, Y: b, Z: c +}", toString(requireTypeAtPosition({9, 28}))); // type(vec) ~= "vector" and typeof(vec) ~= "Instance"
|
|
else
|
|
CHECK_EQ("{- X: a, Y: b, Z: c -}", toString(requireTypeAtPosition({9, 28}))); // type(vec) ~= "vector" and typeof(vec) ~= "Instance"
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(RefinementClassFixture, "typeguard_cast_instance_or_vector3_to_vector")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local function f(x: Instance | Vector3)
|
|
if typeof(x) == "Vector3" then
|
|
local foo = x
|
|
else
|
|
local foo = x
|
|
end
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
CHECK_EQ("Vector3", toString(requireTypeAtPosition({3, 28})));
|
|
CHECK_EQ("Instance", toString(requireTypeAtPosition({5, 28})));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(RefinementClassFixture, "type_narrow_for_all_the_userdata")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local function f(x: string | number | Instance | Vector3)
|
|
if type(x) == "userdata" then
|
|
local foo = x
|
|
else
|
|
local foo = x
|
|
end
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
CHECK_EQ("Instance | Vector3", toString(requireTypeAtPosition({3, 28})));
|
|
CHECK_EQ("number | string", toString(requireTypeAtPosition({5, 28})));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(RefinementClassFixture, "eliminate_subclasses_of_instance")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local function f(x: Part | Folder | string)
|
|
if typeof(x) == "Instance" then
|
|
local foo = x
|
|
else
|
|
local foo = x
|
|
end
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
CHECK_EQ("Folder | Part", toString(requireTypeAtPosition({3, 28})));
|
|
CHECK_EQ("string", toString(requireTypeAtPosition({5, 28})));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(RefinementClassFixture, "narrow_this_large_union")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local function f(x: Part | Folder | Instance | string | Vector3 | any)
|
|
if typeof(x) == "Instance" then
|
|
local foo = x
|
|
else
|
|
local foo = x
|
|
end
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
CHECK_EQ("Folder | Instance | Part", toString(requireTypeAtPosition({3, 28})));
|
|
CHECK_EQ("Vector3 | any | string", toString(requireTypeAtPosition({5, 28})));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(RefinementClassFixture, "x_as_any_if_x_is_instance_elseif_x_is_table")
|
|
{
|
|
CheckResult result = check(R"(
|
|
--!nonstrict
|
|
|
|
local function f(x)
|
|
if typeof(x) == "Instance" and x:IsA("Folder") then
|
|
local foo = x
|
|
elseif typeof(x) == "table" then
|
|
local foo = x
|
|
end
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
CHECK_EQ("Folder", toString(requireTypeAtPosition({5, 28})));
|
|
CHECK_EQ("any", toString(requireTypeAtPosition({7, 28})));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(RefinementClassFixture, "x_is_not_instance_or_else_not_part")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local function f(x: Part | Folder | string)
|
|
if typeof(x) ~= "Instance" or not x:IsA("Part") then
|
|
local foo = x
|
|
else
|
|
local foo = x
|
|
end
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
CHECK_EQ("Folder | string", toString(requireTypeAtPosition({3, 28})));
|
|
CHECK_EQ("Part", toString(requireTypeAtPosition({5, 28})));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "type_guard_can_filter_for_intersection_of_tables")
|
|
{
|
|
CheckResult result = check(R"(
|
|
type XYCoord = {x: number} & {y: number}
|
|
local function f(t: XYCoord?)
|
|
if type(t) == "table" then
|
|
local foo = t
|
|
else
|
|
local foo = t
|
|
end
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
CHECK_EQ("{| x: number |} & {| y: number |}", toString(requireTypeAtPosition({4, 28})));
|
|
CHECK_EQ("nil", toString(requireTypeAtPosition({6, 28})));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "type_guard_can_filter_for_overloaded_function")
|
|
{
|
|
CheckResult result = check(R"(
|
|
type SomeOverloadedFunction = ((number) -> string) & ((string) -> number)
|
|
local function f(g: SomeOverloadedFunction?)
|
|
if type(g) == "function" then
|
|
local foo = g
|
|
else
|
|
local foo = g
|
|
end
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
CHECK_EQ("((number) -> string) & ((string) -> number)", toString(requireTypeAtPosition({4, 28})));
|
|
CHECK_EQ("nil", toString(requireTypeAtPosition({6, 28})));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "type_guard_warns_on_no_overlapping_types_only_when_sense_is_true")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local function f(t: {x: number})
|
|
if type(t) ~= "table" then
|
|
local foo = t
|
|
error(("Expected a table, got %s"):format(type(t)))
|
|
end
|
|
|
|
return t.x + 1
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
CHECK_EQ("*unknown*", toString(requireTypeAtPosition({3, 28})));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "not_a_or_not_b")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local function f(a: number?, b: number?)
|
|
if (not a) or (not b) then
|
|
local foo = a
|
|
local bar = b
|
|
end
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
CHECK_EQ("number?", toString(requireTypeAtPosition({3, 28})));
|
|
CHECK_EQ("number?", toString(requireTypeAtPosition({4, 28})));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "not_a_or_not_b2")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local function f(a: number?, b: number?)
|
|
if not (a and b) then
|
|
local foo = a
|
|
local bar = b
|
|
end
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
CHECK_EQ("number?", toString(requireTypeAtPosition({3, 28})));
|
|
CHECK_EQ("number?", toString(requireTypeAtPosition({4, 28})));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "not_a_and_not_b")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local function f(a: number?, b: number?)
|
|
if (not a) and (not b) then
|
|
local foo = a
|
|
local bar = b
|
|
end
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
CHECK_EQ("nil", toString(requireTypeAtPosition({3, 28})));
|
|
CHECK_EQ("nil", toString(requireTypeAtPosition({4, 28})));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "not_a_and_not_b2")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local function f(a: number?, b: number?)
|
|
if not (a or b) then
|
|
local foo = a
|
|
local bar = b
|
|
end
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
CHECK_EQ("nil", toString(requireTypeAtPosition({3, 28})));
|
|
CHECK_EQ("nil", toString(requireTypeAtPosition({4, 28})));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "either_number_or_string")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local function f(x: any)
|
|
if type(x) == "number" or type(x) == "string" then
|
|
local foo = x
|
|
end
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
CHECK_EQ("number | string", toString(requireTypeAtPosition({3, 28})));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "not_t_or_some_prop_of_t")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local function f(t: {x: boolean}?)
|
|
if not t or t.x then
|
|
local foo = t
|
|
end
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
CHECK_EQ("{| x: boolean |}?", toString(requireTypeAtPosition({3, 28})));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "assert_a_to_be_truthy_then_assert_a_to_be_number")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local a: (number | string)?
|
|
assert(a)
|
|
local b = a
|
|
assert(type(a) == "number")
|
|
local c = a
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
CHECK_EQ("number | string", toString(requireTypeAtPosition({3, 18})));
|
|
CHECK_EQ("number", toString(requireTypeAtPosition({5, 18})));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "merge_should_be_fully_agnostic_of_hashmap_ordering")
|
|
{
|
|
// This bug came up because there was a mistake in Luau::merge where zipping on two maps would produce the wrong merged result.
|
|
CheckResult result = check(R"(
|
|
local function f(b: string | { x: string }, a)
|
|
assert(type(a) == "string")
|
|
assert(type(b) == "string" or type(b) == "table")
|
|
|
|
if type(b) == "string" then
|
|
local foo = b
|
|
end
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
CHECK_EQ("string", toString(requireTypeAtPosition({6, 28})));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "refine_the_correct_types_opposite_of_when_a_is_not_number_or_string")
|
|
{
|
|
CheckResult result = check(R"(
|
|
local function f(a: string | number | boolean)
|
|
if type(a) ~= "number" and type(a) ~= "string" then
|
|
local foo = a
|
|
else
|
|
local foo = a
|
|
end
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
CHECK_EQ("boolean", toString(requireTypeAtPosition({3, 28})));
|
|
CHECK_EQ("number | string", toString(requireTypeAtPosition({5, 28})));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "is_truthy_constraint_ifelse_expression")
|
|
{
|
|
ScopedFastFlag sff1{"LuauIfElseExpressionBaseSupport", true};
|
|
ScopedFastFlag sff2{"LuauIfElseExpressionAnalysisSupport", true};
|
|
|
|
CheckResult result = check(R"(
|
|
function f(v:string?)
|
|
return if v then v else tostring(v)
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
CHECK_EQ("string", toString(requireTypeAtPosition({2, 29})));
|
|
CHECK_EQ("nil", toString(requireTypeAtPosition({2, 45})));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "invert_is_truthy_constraint_ifelse_expression")
|
|
{
|
|
ScopedFastFlag sff1{"LuauIfElseExpressionBaseSupport", true};
|
|
ScopedFastFlag sff2{"LuauIfElseExpressionAnalysisSupport", true};
|
|
|
|
CheckResult result = check(R"(
|
|
function f(v:string?)
|
|
return if not v then tostring(v) else v
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
CHECK_EQ("nil", toString(requireTypeAtPosition({2, 42})));
|
|
CHECK_EQ("string", toString(requireTypeAtPosition({2, 50})));
|
|
}
|
|
|
|
TEST_CASE_FIXTURE(Fixture, "type_comparison_ifelse_expression")
|
|
{
|
|
ScopedFastFlag sff1{"LuauIfElseExpressionBaseSupport", true};
|
|
ScopedFastFlag sff2{"LuauIfElseExpressionAnalysisSupport", true};
|
|
|
|
CheckResult result = check(R"(
|
|
function returnOne(x)
|
|
return 1
|
|
end
|
|
|
|
function f(v:any)
|
|
return if typeof(v) == "number" then v else returnOne(v)
|
|
end
|
|
)");
|
|
|
|
LUAU_REQUIRE_NO_ERRORS(result);
|
|
|
|
CHECK_EQ("number", toString(requireTypeAtPosition({6, 49})));
|
|
CHECK_EQ("any", toString(requireTypeAtPosition({6, 66})));
|
|
}
|
|
|
|
TEST_SUITE_END();
|