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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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| .. | ||
| Anyification.h | ||
| ApplyTypeFunction.h | ||
| AstJsonEncoder.h | ||
| AstQuery.h | ||
| Autocomplete.h | ||
| AutocompleteTypes.h | ||
| BuiltinDefinitions.h | ||
| Cancellation.h | ||
| Clone.h | ||
| Constraint.h | ||
| ConstraintGenerator.h | ||
| ConstraintSet.h | ||
| ConstraintSolver.h | ||
| ControlFlow.h | ||
| DataFlowGraph.h | ||
| DcrLogger.h | ||
| Def.h | ||
| Differ.h | ||
| Documentation.h | ||
| EqSatSimplification.h | ||
| EqSatSimplificationImpl.h | ||
| Error.h | ||
| FileResolver.h | ||
| FragmentAutocomplete.h | ||
| Frontend.h | ||
| Generalization.h | ||
| GlobalTypes.h | ||
| InferPolarity.h | ||
| InsertionOrderedMap.h | ||
| Instantiation.h | ||
| Instantiation2.h | ||
| IostreamHelpers.h | ||
| JsonEmitter.h | ||
| Linter.h | ||
| LValue.h | ||
| Metamethods.h | ||
| Module.h | ||
| ModuleResolver.h | ||
| NonStrictTypeChecker.h | ||
| Normalize.h | ||
| NotNull.h | ||
| OverloadResolution.h | ||
| Polarity.h | ||
| Predicate.h | ||
| Quantify.h | ||
| RecursionCounter.h | ||
| Refinement.h | ||
| RequireTracer.h | ||
| Scope.h | ||
| Set.h | ||
| Simplify.h | ||
| Substitution.h | ||
| Subtyping.h | ||
| Symbol.h | ||
| TableLiteralInference.h | ||
| ToDot.h | ||
| TopoSortStatements.h | ||
| ToString.h | ||
| Transpiler.h | ||
| TxnLog.h | ||
| Type.h | ||
| TypeArena.h | ||
| TypeAttach.h | ||
| TypeChecker2.h | ||
| TypeCheckLimits.h | ||
| TypedAllocator.h | ||
| TypeFunction.h | ||
| TypeFunctionReductionGuesser.h | ||
| TypeFunctionRuntime.h | ||
| TypeFunctionRuntimeBuilder.h | ||
| TypeFwd.h | ||
| TypeInfer.h | ||
| TypeOrPack.h | ||
| TypePack.h | ||
| TypePairHash.h | ||
| TypePath.h | ||
| TypeUtils.h | ||
| Unifiable.h | ||
| Unifier.h | ||
| Unifier2.h | ||
| UnifierSharedState.h | ||
| VisitType.h | ||