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We have lots of new changes for you! # What's Changed ## General - We updated Luau's license year to 2025! - We fixed a bug where large amounts of errors were being printed when deep intersections of unions error. ## Require-by-String This release introduces the `Luau.Require` library, which exposes the runtime semantics of require-by-string, including support for the new `@self` alias described in [this RFC](https://github.com/luau-lang/rfcs/pull/109). The library operates on a virtualized filesystem, allowing consumers to specify navigation rules without assuming a filesystem context. Documentation in `Require.h` explains how to enable the library, and the `setupState` function in Repl.cpp demonstrates how we've integrated it into the luau CLI tool. Note that the interface in `Require.h` is written in C, which enables any application written in a language with a C foreign-function interface to link against this library and enable require-by-string. This makes it straightforward for any application embedding Luau to support require-by-string, provided that it defines or operates within an environment resembling a virtual filesystem. The core navigation semantics of require-by-string have additionally been pulled into the `Luau.RequireNavigator` library. While `Luau.Require` internally depends on `Luau.RequireNavigator`, the latter does not depend on the Luau VM. This library provides an interface for inspecting require-by-string's navigation behavior and therefore serves as a useful dependency for static tooling. Documentation for `Luau.RequireNavigator` is available in `RequireNavigator.h`. ## Autocomplete - We fixed a memory leak in fragment autocomplete! ## New Solver And Old Solver - We've found a infinite iteration error over a type pack. We added a way to detect this error and throw an `InternalCompileError` instead. - We fix `table.freeze` not accounting for the first argument not getting type stated. We fall back to regular inference instead. - We fix a crash in the old solver with `length_error`. - We fix a crash in the new solver stemming from generalization reentrancy. Now we correctly generalize interior free types that do not appear in a function signature. - We fix a nil refinement. (Fixes https://github.com/luau-lang/luau/issues/1687 and https://github.com/luau-lang/luau/issues/1451) ### Internal Contributors Co-authored-by: Andy Friesen <afriesen@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: Vyacheslav Egorov <vegorov@roblox.com> Full Changelog: https://github.com/luau-lang/luau/compare/0.668...0.669 --------- 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>
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MIT License
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Copyright (c) 2019-2025 Roblox Corporation
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Copyright (c) 1994–2019 Lua.org, PUC-Rio.
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Permission is hereby granted, free of charge, to any person obtaining a copy of
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this software and associated documentation files (the "Software"), to deal in
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of the Software, and to permit persons to whom the Software is furnished to do
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so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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