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+---
+author: rescript-team
+date: "2025-11-17"
+previewImg: /static/blog/rescript-12-reforging-build-system.webp
+articleImg: /static/blog/rescript-12-reforging-build-system.webp
+badge: release
+title: "Announcing ReScript 12"
+description: |
+  ReScript 12 arrives with a redesigned build toolchain, a modular runtime, and a wave of ergonomic language features.
+---
+
+## Introduction
+
+ReScript 12 is now available.
+This release completes the multi-year effort to separate the compiler from legacy constraints, refreshes critical developer workflows, and delivers a modern feature set that is grounded in real-world feedback.
+The headline upgrades include a rewritten build system, a standalone runtime package, unified operator support, JSX preserve mode, and numerous syntax improvements that make ReScript code easier to write and maintain.
+
+Teams upgrading from ReScript 11 should review the highlighted breaking changes and schedule time for migration.
+The new tooling provides focused commands, better diagnostics, and smaller downloads, while the language additions flatten sharp edges that many of you encountered in larger codebases.
+
+## Breaking Changes
+
+### Build system redesign
+
+ReScript 12 ships with the new build system introduced earlier this month in the [Reforging the Build System](./2025-11-04-reforging-build-system.mdx) preview.
+The tooling now relies on a modern architecture that tracks dependencies more precisely, avoids unnecessary recompilations, and integrates with incremental workflows.
+The old build system remains available through `rescript-legacy`, but active projects should switch to the new commands to benefit from faster feedback loops and clearer output.
+
+### Runtime package split
+
+The compiler no longer embeds runtime modules.
+Instead, the runtime lives in the dedicated `@rescript/runtime` npm package, which contains Belt, Stdlib, Js, primitive modules, and supporting artifacts compiled in both ES Module and CommonJS formats.
+Earlier versions bundled these files inside the `rescript` package and exposed an optional `@rescript/std` helper.
+ReScript 12 removes `@rescript/std`; install `rescript` and `@rescript/runtime` together to keep projects in sync.
+Projects that previously published custom runtime shims should revisit their setup to ensure the new package structure remains discoverable.
+
+### Updated bitwise operator surface
+
+Legacy OCaml-style bitwise functions such as `land`, `lor`, and `lsl` are deprecated.
+They continue to work in v12 with warnings but will be removed in v13.
+ReScript now prefers unified operator syntax: `&&&`, `|||`, `^^^`, and `~~~` cover AND, OR, XOR, and NOT for both `int` and `bigint`.
+
+### API naming alignment
+
+APIs that previously ended with `Exn` now end with `OrThrow`.
+Examples include `Option.getOrThrow`, `List.headOrThrow`, `BigInt.fromStringOrThrow`, and `JSON.parseOrThrow`.
+The change clarifies that these functions throw JavaScript errors, aligning the naming with the language’s semantics.
+The deprecated `*Exn` variants remain available in v12 to ease the transition, and the codemod bundled with the migration tool can perform a mechanical rename.
+Be aware that `Result.getOrThrow` now throws a JavaScript `Error`, so update any exception handling logic that depended on OCaml exception names.
+
+### JSX version requirement
+
+JSX v3 has been removed.
+ReScript 12 requires JSX v4 configuration in `rescript.json`, using the `"jsx": { "version": 4 }` schema.
+ReScript React projects must update their configuration before moving to v12.
+Projects attempting to compile with v3 will receive an explicit error, ensuring that your codebase uses the current transform and associated tooling.
+
+### Deprecation of OCaml compatibility helpers
+
+The standard library continues its shift away from OCaml-specific aliases.
+Functions such as `succ`, `pred`, `abs_float`, `string_of_int`, `fst`, `raise`, and the `char` type are now deprecated.
+The recommended replacements are the JavaScript-aligned counterparts in `Int`, `Float`, `Bool`, `Pair`, and related modules, alongside the `throw` keyword for exceptions.
+References to the OCaml composition operators (`|>`, `@@`) now warn and will be removed in v13; the ReScript pipe operator `->` replaces them.
+The migration tool highlights deprecated usage, and incremental cleanups are encouraged so your codebase is ready before the next major release.
+
+## New features
+
+### Unified operators
+
+ReScript 12 finalizes the unified operator work introduced [earlier this year](./2025-04-11-introducing-unified-operators.mdx).
+Arithmetic, comparison, and bitwise operators now behave consistently across `int` and `bigint`, allowing the compiler to infer the correct specialization from the left operand.
+
+### Expanded bitwise capabilities
+
+In addition to deprecating the OCaml-style helpers, ReScript 12 adds new operator spellings.
+JavaScript-style bitwise operators (`&`, `|`, `^`, `~`) and shift operators (`<<`, `>>`, `>>>`) are first-class citizens that compile directly to their JavaScript equivalents.
+Combined with the unified F#-style operators, developers can select the syntax that best fits their code policies without sacrificing performance or type safety.
+
+### Dict literals and pattern matching
+
+The language now supports dictionary literals (`dict{"foo": "bar"}`) that compile to plain JavaScript objects.
+Dict literals work with variables, multi-line formatting, and optional entries, and they drastically reduce the boilerplate compared to `Dict.fromArray`.
+Pattern matching also understands dicts, enabling concise destructuring of JSON payloads and configuration objects.
+The compiler emits the same optimized JavaScript while preserving ReScript's type guarantees.
+
+```rescript
+let user = dict{"name": "Ada", "role": "engineer"}
+
+switch user {
+| dict{"name": name, "role": role} => Console.log2(name, role)
+| _ => Console.log("missing user metadata")
+}
+```
+
+### Nested and inline record types
+
+Nested record definitions and inline record payloads remove the need for auxiliary type declarations.
+You can define optional nested structures directly inside records, or attach record payloads to variant constructors without creating standalone types.
+The feature supports mutable fields, type parameters, and record spreading, providing better locality for complex domain models with no runtime penalty.
+
+```rescript
+type profile = {
+  name: string,
+  extra?: {
+    location: {city: string, country: string},
+    mutable note: option<string>,
+  },
+}
+```
+
+### Variant pattern spreads
+
+Pattern spreads (`| ...SomeVariant as value =>`) allow you to reuse handlers for entire subsets of constructors.
+When a variant extends another variant through spreads, you can match the shared constructors in one branch and delegate to helper functions, keeping exhaustive matches concise even as the hierarchy grows.
+The compiler enforces subtype relationships and ensures that runtime representations remain compatible.
+
+```rescript
+type base = Start | Stop | Pause
+type extended = | ...base | Resume
+
+let handle = (event: extended) =>
+  switch event {
+  | ...base as core => Console.log2("base", core)
+  | Resume => Console.log("resuming")
+  }
+```
+
+### JSX preserve mode
+
+Projects that rely on downstream JSX tooling can enable [preserve mode](../docs/manual/v12.0.0/jsx#preserve-mode) via `"jsx": { "version": 4, "preserve": true }`.
+The compiler will emit JSX syntax directly instead of transforming elements to `react/jsx-runtime` calls, allowing bundlers such as ESBuild, SWC, or Babel to apply their own transforms.
+This mode keeps JSX readable in the output, retains spread props, and maintains compatibility with React Server Components.
+React classic mode is no longer supported, so projects must use the JSX v4 transform regardless of preserve mode settings.
+When preserve mode is disabled, the compiler continues to output the optimized runtime calls you are accustomed to.
+
+### Function-level directives
+
+The new `@directive` attribute emits JavaScript directive strings at the top of generated functions.
+Use it to mark server actions with `'use server'`, memoized handlers with `'use memo'`, or any other directive that your framework requires.
+The attribute works on synchronous and asynchronous functions, supports labeled parameters, and removes the need for `%raw` blocks.
+Combined with JSX preserve mode, this enables clean integration with [React Server Components](../docs/react/latest/server-components.mdx) and other directive-based runtimes.
+
+### Regex literals
+
+ReScript now understands JavaScript-style regular expression literals (`/pattern/flags`).
+They are full equivalents of `%re` expressions, supporting all ECMAScript flags, Unicode character classes, and sticky searches.
+The literals compile directly to JavaScript regex objects, so existing APIs like `RegExp.exec` and `RegExp.test` continue to work exactly as before, but with clearer syntax and better editor support.
+
+```rescript
+let emailPattern = /^[^\s@]+@[^\s@]+\.[^\s@]+$/i
+
+if emailPattern->RegExp.test("contact@rescript-lang.org") {
+  Console.log("Valid email")
+}
+
+switch emailPattern->RegExp.exec("invalid") {
+| Some(match) => Console.log(match->RegExp.Result.fullMatch)
+| None => Console.log("No match")
+}
+```
+
+### Experimental `let?` syntax
+
+This release introduces an experimental `let?` syntax for zero-cost unwrapping of `option` and `result` values.
+The syntax remains behind an opt-in flag while the community evaluates its ergonomics.
+Refer to the forum discussion at https://forum.rescript-lang.org/t/proposing-new-syntax-for-zero-cost-unwrapping-options-results/6227 for the current proposal, examples, and feedback guidelines.
+
+```rescript
+type user = {
+  address?: {
+    city?: string,
+  },
+}
+
+let userCity = (user: user): option<string> => {
+  let? Some(address) = user.address
+  let? Some(city) = address.city
+  Some(city)
+}
+```
+
+## Platform and tooling improvements
+
+### Cleaner JavaScript output
+
+The printer now emits compact arrow functions and streamlines anonymous function expressions, making generated JavaScript easier to audit.
+These changes preserve semantics while aligning the output with modern JavaScript style.
+
+### Internal architecture updates
+
+The compiler cleans up its internal abstract syntax tree, removes unused OCaml-era nodes, and tracks async and partial function metadata directly on AST nodes.
+These changes simplify future feature work and reduce maintenance overhead.
+
+### ESM-first distribution
+
+The `rescript` npm package declares `"type": "module"` and ships ESM code across the CLI.
+Import statements replace CommonJS `require` usage, improving compatibility with contemporary bundlers and enabling better tree-shaking.
+
+### Platform-specific binaries
+
+Installer footprints shrink thanks to platform-specific binary packages such as `@rescript/darwin-arm64`, `@rescript/linux-x64`, and `@rescript/win32-x64`.
+npm installs only the binary that matches your operating system and architecture, delivering substantially faster installs and smaller cache footprints for CI pipelines.
+The primary `rescript` package loads the appropriate binary at runtime and surfaces clear error messages if the matching package is missing.
+
+## Acknowledgments
+
+![ReScript core team during the 2025 Vienna retreat](/static/blog/rescript-retreat-2025.webp)
+
+Thank you to every contributor, tester, and partner who helped shape ReScript 12.
+The core team gathered in Vienna earlier this year to map out this release, and your feedback guided every decision.
+Community pull requests, bug reports, and experiments across the ecosystem gave us the confidence to complete large refactors and deprecations.
+
+## Reach out
+
+Join the conversation on the community forum if you have migration questions or want to share what you build with ReScript 12.
+Businesses that rely on ReScript can contact the association at https://rescript-association.org/contact to explore support, sponsorship, or collaboration.
+Funding enables the team to ship features like the new runtime architecture faster, so every contribution, financial or otherwise, helps the language move forward.
+
+We look forward to hearing what you create with ReScript 12.
+
+![The ReScript team at the 2025 retreat in Vienna](/static/blog/rescript-team-2025.webp)
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