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# What's Changed? We've been hard at work fixing bugs and introducing new features! ## VM * Include constant-folding information in Luau cost model for inlining and loop unrolling * ~1% improvement in compile times ## New Type Solver * `Luau::shallowClone`'s last argument, whether to clone persistent (builtin) types, is now non-optional. * Refinements on properties of tables are now computed with a `read` table property. This resolves some issues around refining table properies and then trying to set them. Fixes #1344. Fixes #1651. ``` if foo.bar then -- Prior to this release, this would be `typeof(foo) & { bar: ~(false?) } -- Now, this is `typeof(foo) & { read bar: ~(false?) } end ``` * The type function `keyof` should respect the empty string as a property, as in: ``` -- equivalent to type Foo ="" type Foo = keyof<{ [""]: number }> ``` * Descend into literals to report subtyping errors for function calls: this both improves bidirectional inference and makes errors more specific. Before, the error reporting for a table with incorrect members passed to a function would cite the entire table, but now it only cites the members that are incorrectly typed. * Fixes a case where intersecting two tables without any common properties would create `never`, instead of a table with both of their properties. # Internal Contributors Co-authored-by: Ariel Weiss <aaronweiss@roblox.com> Co-authored-by: Hunter Goldstein <hgoldstein@roblox.com> Co-authored-by: James McNellis <jmcnellis@roblox.com> Co-authored-by: Sora Kanosue <skanosue@roblox.com> Co-authored-by: Talha Pathan <tpathan@roblox.com> Co-authored-by: Vighnesh Vijay <vvijay@roblox.com> Co-authored-by: Vyacheslav Egorov <vegorov@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: Aviral Goel <agoel@roblox.com> Co-authored-by: Vighnesh <vvijay@roblox.com> Co-authored-by: Vyacheslav Egorov <vegorov@roblox.com> Co-authored-by: Ariel Weiss <aaronweiss@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 | ||
| Documentation.h | ||
| EqSatSimplification.h | ||
| EqSatSimplificationImpl.h | ||
| Error.h | ||
| ExpectedTypeVisitor.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 | ||
| TypeIds.h | ||
| TypeInfer.h | ||
| TypeOrPack.h | ||
| TypePack.h | ||
| TypePairHash.h | ||
| TypePath.h | ||
| TypeUtils.h | ||
| Unifiable.h | ||
| Unifier.h | ||
| Unifier2.h | ||
| UnifierSharedState.h | ||
| VisitType.h | ||