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# What's Changed? Hi there, folks! It's been another busy week in the type mines, trying to bring you all the very best type inference system we can. We've got a bunch of updates to large pain points across the new type solver, and our next big update (currently under a debug flag) improving type generalization is finally nearing completion (and should hopefully eliminate quite a lot of "type solver failed to complete" errors). We've also continued polishing both the CST Parser and the `Luau.Require` library we introduced a few releases ago based on user feedback and bug reports, and we're really happy with how they're turning out. # Parser - Fixes a bug in the CST tooling where the spacing on return type annotations for functions was not being printed correctly. - Resolves some issues with the JSON encoding of `AstGenericType` and `AstGenericTypePack` # Runtime - Implements support for yielding requires in `Luau.Require` library. - Improves the error messages for require-by-string to include the chunk name that was problematic where possible and the overall require path that failed to be required. - Fixes a bug that prevented the use of `require` within C functions and `pcall`. - Adds an API to support selectively removing chunks from the require cache in `Luau.Require` - Adds an API to support clearing the entire require cache in `Luau.Require` # New Type Solver - Fixes a crash in the new non-strict mode when visiting function return types in incomplete ASTs (e.g. during editing). - Improves type simplification to support intersections of tables with extern types, resolving _one_ of the causes of frequent refinements unexpectedly leading to `never`. - Improves type inference to better understand diverging branches in functions, reducing false negatives where the type system fails to learn that a binding must now always be initialized. - Fixes a typo in the type definitions for user-defined function types where the `intersection` tag was misspelled. - Improves the overall accuracy of free type tracking during constraint solving, leading to better inference results overall. - Implements `types.optional` as a new library function for user-defined type functions to make it easier to union a type with `nil`. - Resolves a number of bugs caused by local type inference expanding the domain of upvalues # Internal Contributors Co-authored-by: Andy Friesen <afriesen@roblox.com> Co-authored-by: Ariel Weiss <aaronweiss@roblox.com> Co-authored-by: Hunter Goldstein <hgoldstein@roblox.com> Co-authored-by: Talha Pathan <tpathan@roblox.com> Co-authored-by: Varun Saini <vsaini@roblox.com> Co-authored-by: Vighnesh Vijay <vvijay@roblox.com> --------- Co-authored-by: Hunter Goldstein <hgoldstein@roblox.com> Co-authored-by: Varun Saini <61795485+vrn-sn@users.noreply.github.com> Co-authored-by: Alexander Youngblood <ayoungblood@roblox.com> Co-authored-by: Menarul Alam <malam@roblox.com> Co-authored-by: Aviral Goel <agoel@roblox.com> Co-authored-by: Vighnesh <vvijay@roblox.com> Co-authored-by: Vyacheslav Egorov <vegorov@roblox.com> Co-authored-by: Andy Friesen <afriesen@roblox.com> |
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| .. | ||
| conformance | ||
| require | ||
| AssemblyBuilderA64.test.cpp | ||
| AssemblyBuilderX64.test.cpp | ||
| AstJsonEncoder.test.cpp | ||
| AstQuery.test.cpp | ||
| AstQueryDsl.cpp | ||
| AstQueryDsl.h | ||
| AstVisitor.test.cpp | ||
| Autocomplete.test.cpp | ||
| BuiltinDefinitions.test.cpp | ||
| ClassFixture.cpp | ||
| ClassFixture.h | ||
| CodeAllocator.test.cpp | ||
| Compiler.test.cpp | ||
| Config.test.cpp | ||
| Conformance.test.cpp | ||
| ConformanceIrHooks.h | ||
| ConstraintGeneratorFixture.cpp | ||
| ConstraintGeneratorFixture.h | ||
| ConstraintSolver.test.cpp | ||
| CostModel.test.cpp | ||
| DataFlowGraph.test.cpp | ||
| DenseHash.test.cpp | ||
| DiffAsserts.cpp | ||
| DiffAsserts.h | ||
| Differ.test.cpp | ||
| EqSat.language.test.cpp | ||
| EqSat.propositional.test.cpp | ||
| EqSat.slice.test.cpp | ||
| EqSatSimplification.test.cpp | ||
| Error.test.cpp | ||
| Fixture.cpp | ||
| Fixture.h | ||
| FragmentAutocomplete.test.cpp | ||
| Frontend.test.cpp | ||
| Generalization.test.cpp | ||
| InferPolarity.test.cpp | ||
| InsertionOrderedMap.test.cpp | ||
| Instantiation2.test.cpp | ||
| IostreamOptional.h | ||
| IrBuilder.test.cpp | ||
| IrCallWrapperX64.test.cpp | ||
| IrLowering.test.cpp | ||
| IrRegAllocX64.test.cpp | ||
| JsonEmitter.test.cpp | ||
| Lexer.test.cpp | ||
| Linter.test.cpp | ||
| LValue.test.cpp | ||
| main.cpp | ||
| Module.test.cpp | ||
| NonstrictMode.test.cpp | ||
| NonStrictTypeChecker.test.cpp | ||
| Normalize.test.cpp | ||
| NotNull.test.cpp | ||
| Parser.test.cpp | ||
| RegisterCallbacks.cpp | ||
| RegisterCallbacks.h | ||
| Repl.test.cpp | ||
| RequireByString.test.cpp | ||
| RequireTracer.test.cpp | ||
| RuntimeLimits.test.cpp | ||
| ScopedFlags.h | ||
| Set.test.cpp | ||
| SharedCodeAllocator.test.cpp | ||
| Simplify.test.cpp | ||
| StringUtils.test.cpp | ||
| Subtyping.test.cpp | ||
| Symbol.test.cpp | ||
| ToDot.test.cpp | ||
| TopoSort.test.cpp | ||
| ToString.test.cpp | ||
| Transpiler.test.cpp | ||
| TxnLog.test.cpp | ||
| TypeFunction.test.cpp | ||
| TypeFunction.user.test.cpp | ||
| TypeInfer.aliases.test.cpp | ||
| TypeInfer.annotations.test.cpp | ||
| TypeInfer.anyerror.test.cpp | ||
| TypeInfer.builtins.test.cpp | ||
| TypeInfer.cfa.test.cpp | ||
| TypeInfer.classes.test.cpp | ||
| TypeInfer.definitions.test.cpp | ||
| TypeInfer.functions.test.cpp | ||
| TypeInfer.generics.test.cpp | ||
| TypeInfer.intersectionTypes.test.cpp | ||
| TypeInfer.loops.test.cpp | ||
| TypeInfer.modules.test.cpp | ||
| TypeInfer.negations.test.cpp | ||
| TypeInfer.oop.test.cpp | ||
| TypeInfer.operators.test.cpp | ||
| TypeInfer.primitives.test.cpp | ||
| TypeInfer.provisional.test.cpp | ||
| TypeInfer.refinements.test.cpp | ||
| TypeInfer.singletons.test.cpp | ||
| TypeInfer.tables.test.cpp | ||
| TypeInfer.test.cpp | ||
| TypeInfer.tryUnify.test.cpp | ||
| TypeInfer.typePacks.test.cpp | ||
| TypeInfer.typestates.test.cpp | ||
| TypeInfer.unionTypes.test.cpp | ||
| TypeInfer.unknownnever.test.cpp | ||
| TypePack.test.cpp | ||
| TypePath.test.cpp | ||
| TypeVar.test.cpp | ||
| Unifier2.test.cpp | ||
| Variant.test.cpp | ||
| VecDeque.test.cpp | ||
| VisitType.test.cpp | ||