Modernize toolchain: .NET 10, Fable 5.14, Vite 8, Bun workspace

Bring the project back to current versions of everything it builds on and
restructure the repository as a Bun workspace. No plugin behaviour changes
apart from the JSX transform backend.

.NET side
- Target net10.0 for Fable.Daemon and its tests; global.json pins SDK 10.0.400.
  Fable.Compiler 5.14.1 only ships net10.0, so the .NET 10 runtime is now
  required at install time.
- Upgrade Fable.Compiler 5.0.0-alpha.13 -> 5.14.1, Fable.AST -> 5.0.0 and the
  transitive pins that come with it (FSharp.Core 10.1.203, StreamJsonRpc
  2.25.29, MessagePack 2.5.302, Nerdbank.Streams 2.13.31). Drop the explicit
  System.Text.Json reference now provided by the SDK.
- Replace CoolCatCracking with Fable's own MSBuildCrackerResolver. The new
  ProjectCracking.fs keeps what Fable's resolver lacks: the design time build
  cache, the fable_modules compile cache and the list of MSBuild files the
  plugin watches. CliArgs.NoRestore is now false because Fable's resolver uses
  it to decide whether to pass /restore.
- Decode the MSBuild JSON in Caching.fs with System.Text.Json and remove the
  Thoth.Json.* dependencies.
- MSBuild.fs no longer gives up after five seconds and fails on a non-zero
  exit code instead of silently continuing with partial output.
- Keep cracking.fsx as a scratch script; it is executable and takes the fsproj
  as its last argument.
- dotnet tools: Fantomas 8.0.0-alpha-025, fsdocs-tool 22.1.0,
  dotnet-outdated-tool 4.8.1. Sources reformatted with Fantomas 8.

JavaScript side
- Vite 8 (rolldown) as peer dependency. The JSX post-transform uses Vite's
  transformWithOxc instead of a direct esbuild dependency; the jsx plugin
  option keeps its 'transform' | 'preserve' | 'automatic' surface.
- Update all npm dependencies (@babel/code-frame 8, ts-lsp-client 1.1.1,
  TypeScript 7, @types/node 26; React 19, @vitejs/plugin-react 6 and
  vite-plugin-inspect 12 in the sample) and @fable-org/fable-library-js 2.5.1
  to match the compiler.
- Locate fable-library with import.meta.resolve instead of guessing
  node_modules paths, so hoisted, isolated and pnpm-style layouts all work.
- Replace Prettier with oxfmt (bun run format / format:check).

Repository layout
- Bun workspace with the isolated linker: the publishable package lives in
  packages/vite-plugin-fable, sample-project depends on it via workspace:*,
  and shared versions (vite, vite-plugin-inspect, fable-library-js) are
  declared once in the root catalog. Single lockfile at the root.
- Directory.*.props stay at the repo root; prepublishOnly copies them into the
  package because the consumer-side postinstall still runs dotnet publish.
  The changelog updater moves to scripts/.
- .gitignore: un-ignore /packages/* (the NuGet template rule matched it).

CI
- Actions bumped to current majors (checkout v7, setup-bun v2, setup-dotnet v6,
  upload-pages-artifact v5, deploy-pages v5); setup-dotnet reads global.json.
- New "Check formatting" step (oxfmt + dotnet fantomas check) and the sample
  build step now fails on a real error instead of grepping the output.

Also adds ROADMAP.md with the remaining action items (postinstall
distribution, Vite lifecycle/HMR audit, F# rewrite of the plugin, .fsi change
detection).

Author: nojaf

.config/dotnet-tools.json

@@ -4,24 +4,18 @@
   "tools": {
     "fantomas": {
       "version": "8.0.0-alpha-025",
-      "commands": [
-        "fantomas"
-      ],
+      "commands": ["fantomas"],
       "rollForward": false
     },
     "fsdocs-tool": {
       "version": "22.1.0",
-      "commands": [
-        "fsdocs"
-      ],
+      "commands": ["fsdocs"],
       "rollForward": false
     },
     "dotnet-outdated-tool": {
       "version": "4.8.1",
-      "commands": [
-        "dotnet-outdated"
-      ],
+      "commands": ["dotnet-outdated"],
       "rollForward": false
     }
   }
-}
+}

.github/workflows/main.yml

@@ -2,7 +2,7 @@ name: Main
 
 on:
   push:
-    branches: [ "main" ]
+    branches: ["main"]
 
 permissions:
   contents: read
@@ -27,23 +27,23 @@ jobs:
       - name: Restore tools
         run: dotnet tool restore
 
-      - name: Check formatting
-        run: dotnet fantomas check .
-
       - name: Restore solution
         run: dotnet restore
 
       - name: Install node_modules
         run: bun install --frozen-lockfile
 
+      - name: Check formatting
+        run: bun run format:check
+
       - name: TypeScript check
         run: bun run lint
 
       - name: Build daemon
-        run : bun run postinstall
+        run: bun run --cwd packages/vite-plugin-fable postinstall
 
       - name: Build docs
-        run: dotnet fsdocs build --noapidocs --projects "$(pwd)/Fable.Daemon/Fable.Daemon.fsproj"
+        run: dotnet fsdocs build --noapidocs --projects "$(pwd)/packages/vite-plugin-fable/Fable.Daemon/Fable.Daemon.fsproj"
 
       - name: Upload artifact
         uses: actions/upload-pages-artifact@v5

.github/workflows/pr.yml

@@ -1,6 +1,6 @@
 name: PR
 
-on: [ pull_request ]
+on: [pull_request]
 
 jobs:
   build:
@@ -20,24 +20,24 @@ jobs:
       - name: Restore tools
         run: dotnet tool restore
 
-      - name: Check formatting
-        run: dotnet fantomas check .
-
       - name: Restore solution
         run: dotnet restore
 
       - name: Install node_modules
         run: bun install --frozen-lockfile
 
+      - name: Check formatting
+        run: bun run format:check
+
       - name: TypeScript check
         run: bun run lint
 
       - name: Build daemon
-        run : bun run postinstall
+        run: bun run --cwd packages/vite-plugin-fable postinstall
 
       - name: Build sample
-        run: bun i && bun run build 2>&1 | grep -i "error" && exit 1 || true
+        run: bun run build
         working-directory: ./sample-project
 
       - name: Build docs
-        run: dotnet fsdocs build --noapidocs --projects "$(pwd)/Fable.Daemon/Fable.Daemon.fsproj"
+        run: dotnet fsdocs build --noapidocs --projects "$(pwd)/packages/vite-plugin-fable/Fable.Daemon/Fable.Daemon.fsproj"

.gitignore

@@ -206,6 +206,8 @@ PublishScripts/
 **/[Pp]ackages/*
 # except build/, which is used as an MSBuild target.
 !**/[Pp]ackages/build/
+# the Bun workspace packages of this repo
+!/packages/*
 # Uncomment if necessary however generally it will be regenerated when needed
 #!**/[Pp]ackages/repositories.config
 # NuGet v3's project.json files produces more ignorable files
@@ -489,4 +491,7 @@ tmp/
 output/
 
 # VSCode
-.vscode/
+.vscode/
+# copied from the repo root by prepublishOnly
+/packages/vite-plugin-fable/Directory.Build.props
+/packages/vite-plugin-fable/Directory.Packages.props

.oxfmtrc.json

@@ -0,0 +1,11 @@
+{
+  "$schema": "./node_modules/oxfmt/configuration_schema.json",
+  "ignorePatterns": [
+    "**/bin/**",
+    "**/obj/**",
+    "**/artifacts/**",
+    "**/fable_modules/**",
+    "output/**",
+    "docs/content/**"
+  ]
+}

CHANGELOG.md

@@ -6,7 +6,9 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html) from version [0.1.0] moving forward.
 
 ## [Unreleased]
+
 ### Changed
+
 - Fable.Daemon now targets `net10.0`; the .NET 10 runtime is required.
 - Updated Fable.Compiler to 5.14.1 and `@fable-org/fable-library-js` to 2.5.1.
 - Project cracking now delegates to Fable's own `MSBuildCrackerResolver`. The design time build cache and watched MSBuild files are kept in `ProjectCracking.fs`; `CoolCatCracking.fs` was removed.
@@ -15,118 +17,174 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Sample project targets `net10.0`.
 - GitHub Actions updated to their latest major versions and the workflows read the SDK version from `global.json`.
 - dotnet tools updated: Fantomas 8.0.0-alpha-025, fsdocs-tool 22.1.0, dotnet-outdated-tool 4.8.1. Sources reformatted with Fantomas 8 and CI now runs `dotnet fantomas check .`.
+- Vite 8 is the peer dependency. The JSX transform after Fable compilation uses Vite's `transformWithOxc` (rolldown/oxc); `esbuild` is no longer a peer dependency.
+- All JavaScript dependencies updated (`@babel/code-frame` 8, `ts-lsp-client` 1.1.1, TypeScript 7, React 19 and `@vitejs/plugin-react` 6 in the sample).
+- The repository is a Bun workspace with isolated installs: the plugin lives in `packages/vite-plugin-fable` and `sample-project` depends on it via `workspace:*`. `Directory.*.props` stay at the repo root and are copied into the package by `prepublishOnly`; the changelog updater lives in `scripts/`. Shared versions (`vite`, `vite-plugin-inspect`, `@fable-org/fable-library-js`) are declared once in the root workspace catalog and referenced as `catalog:`.
+- `fable-library` is located with `import.meta.resolve` instead of guessing `node_modules` paths.
+- Prettier replaced by oxfmt (`bun run format`, `bun run format:check`).
 
 ### Fixed
+
 - `dotnet msbuild` invocations for the cache key no longer give up after 5 seconds and now fail on a non-zero exit code.
 
 ## [0.2.1] - 2025-10-23
+
 ### Changed
+
 - Removed caret range from ts-lsp-client to use version 1.0.4, pr ([#59](https://github.com/fable-compiler/vite-plugin-fable/pull/59)), targets issue ([#58](https://github.com/fable-compiler/vite-plugin-fable/issues/58))
 
 ## [0.2.0] - 2025-06-24
+
 ### Changed
-- Upgrade to Vite 7.0.0 as peer dependency and adjust transform hook to use latest filter property, pr ([#49](https://github.com/fable-compiler/vite-plugin-fable/pull/49)), targets issue ([#39]([#39](https://github.com/fable-compiler/vite-plugin-fable/issues/39))
+
+- Upgrade to Vite 7.0.0 as peer dependency and adjust transform hook to use latest filter property, pr ([#49](https://github.com/fable-compiler/vite-plugin-fable/pull/49)), targets issue ([#39](<[#39](https://github.com/fable-compiler/vite-plugin-fable/issues/39)>)
 
 ## [0.1.1] - 2025-06-03
+
 ### Fixed
+
 - Support `major` roll forward dotnet versions of runtime for Fable.Daemon, pr ([#46](https://github.com/fable-compiler/vite-plugin-fable/pull/46)), targets issue ([#44](https://github.com/fable-compiler/vite-plugin-fable/issues/44))
 
 ## [0.1.0] - 2025-05-22
+
 ### Changed
+
 - bumping version and package release for changelog sync
 
 ## [0.0.37] - 2025-05-10
+
 ### Changed
+
 - Fable.Compiler updated to 5.0.0-alpha.13 ([#38](https://github.com/fable-compiler/vite-plugin-fable/pull/38))
 - Added caret range to fable-library-js ([#38](https://github.com/fable-compiler/vite-plugin-fable/pull/38))
 - Updated fable-library-js to 2.0.0-beta.3 ([#38](https://github.com/fable-compiler/vite-plugin-fable/pull/38))
 
 ## [0.0.36] - 2025-05-07
+
 ### Changed
+
 - Updated fable-library-js to ^2.0.0-beta.3 ([#38](https://github.com/fable-compiler/vite-plugin-fable/pull/38))
 
 ## [0.0.35] - 2025-04-30
+
 ### Added
+
 - Added README for Fable Daemon ([#34](https://github.com/fable-compiler/vite-plugin-fable/pull/34))
 
 ## [0.0.34] - 2025-04-20
+
 ### Changed
+
 - Upgrade to latest Fable.Compiler and Fable.AST ([#13](https://github.com/fable-compiler/vite-plugin-fable/pull/13))
 
 ## [0.0.33] - 2025-04-10
+
 ### Changed
+
 - Update node dependencies and bump version
 
 ## [0.0.32] - 2025-03-30
+
 ### Fixed
+
 - Fix Thoth.Json usage ([#23](https://github.com/fable-compiler/vite-plugin-fable/pull/23))
 
 ## [0.0.31] - 2025-03-15
+
 ### Added
+
 - Error overlay for development ([#8](https://github.com/fable-compiler/vite-plugin-fable/pull/8))
 
 ## [0.0.30] - 2025-03-01
+
 ### Added
+
 - Vite 6 support ([#11](https://github.com/fable-compiler/vite-plugin-fable/pull/11))
 
 ## [0.0.29] - 2025-02-20
+
 ### Changed
+
 - Improved diagnostics ([#3](https://github.com/fable-compiler/vite-plugin-fable/pull/3))
 
 ## [0.0.28] - 2025-02-10
+
 ### Added
+
 - Debug viewer ([#5](https://github.com/fable-compiler/vite-plugin-fable/pull/5))
 
 ## [0.0.27] - 2025-01-30
+
 ### Changed
+
 - Combine file changes for faster rebuilds ([#6](https://github.com/fable-compiler/vite-plugin-fable/pull/6))
 
 ## [0.0.26] - 2025-01-15
+
 ### Added
+
 - Project options cache ([#2](https://github.com/fable-compiler/vite-plugin-fable/pull/2))
 
 ## [0.0.25] - 2025-01-05
+
 ### Added
+
 - Support for arm64 architecture in postinstall ([#1](https://github.com/fable-compiler/vite-plugin-fable/pull/1))
 
 ## [0.0.24] - 2024-03-02
+
 ### Changed
+
 - Improved endpoint call control via shared pending changes subscription.
 - Various internal improvements and bug fixes.
 
 ## [0.0.22] - 2024-02-28
+
 ### Changed
+
 - Update Fable.Compiler to 4.0.0-alpha-008.
 - Update TypeScript and include debug folder.
 
 ## [0.0.20] - 2024-02-26
+
 ### Changed
+
 - Handle F# changes via handleHotUpdate callback.
 - Improved file change tracking and project cache key logic.
 
 ## [0.0.18] - 2024-02-25
+
 ### Changed
+
 - Only send sourceFiles list of FSharpProjectOptions to plugin.
 - Additional logging and reuse of CrackerOptions.
 
 ## [0.0.16] - 2024-02-24
+
 ### Added
+
 - Debug documentation and error overlay prototype.
 - Initial debug page setup.
 
 ## [0.0.7] - 2024-02-13
+
 ### Added
+
 - Diagnostics support ([#3](https://github.com/fable-compiler/vite-plugin-fable/pull/3)).
 - Use @fable-org/fable-library-js.
 
 ## [0.0.3] - 2024-02-05
+
 ### Added
+
 - Thoth.Json support.
 - Initial cache key setup for project configuration.
 - Initial caching for design time build.
 
 ## [0.0.1] - 2023-10-28
+
 ### Added
+
 - Initial implementation of Vite plugin for Fable.
 - Basic F# file compilation and integration with Vite build.
 - Early support for project file watching and hot reload.

README.md

@@ -2,15 +2,14 @@
 
 [![NPM Version](https://img.shields.io/npm/v/vite-plugin-fable)](https://www.npmjs.com/package/vite-plugin-fable)
 
-
 <img alt="vite-plugin-fable logo" src="https://github.com/fable-compiler/vite-plugin-fable/blob/main/docs/img/logo.png?raw=true" height="300"></img>
 
 > [!IMPORTANT]
 > This project is up for adoption. I'm looking for eager people to maintain this.<br>Please open a [discussion](https://github.com/fable-compiler/vite-plugin-fable/discussions) if you are interested!
 
 ## What is this?
 
-Alright, the `tl;dr` is that I don't like the current way of how you can use [Fable](https://fable.io) with [Vite](https://vitejs.dev). 
+Alright, the `tl;dr` is that I don't like the current way of how you can use [Fable](https://fable.io) with [Vite](https://vitejs.dev).
 I'm referring to the steps in the [get started with Vite](https://fable.io/docs/getting-started/javascript.html#browser), I don't like it and have an alternate take on it.
 
 More thoughts on this can be read from the [documentation](https://fable.io/vite-plugin-fable/).
@@ -21,6 +20,7 @@ A first package was pushed to npm. This was merely to reserve the package name.
 You can read the code, that's is it for now.
 
 ### Recent Notes
+
 Support for the latest .NET runtime was added in [v0.1.1](https://github.com/fable-compiler/vite-plugin-fable/blob/main/CHANGELOG.md#011---2025-06-03). Please upgrade to the latest version. Earlier versions may fail silently if the .NET 8 runtime is missing—see the changelog for details.
 
 ## Video

ROADMAP.md

@@ -24,6 +24,8 @@ Order is a rough suggestion: the first three unblock building locally and shrink
 
 ## 2. Rethink `postinstall`
 
+_2026-08-29: the repo is now a Bun workspace (`packages/vite-plugin-fable` + `sample-project`, isolated linker). `postinstall` still runs `dotnet publish` inside the package; the distribution question below is unchanged._
+
 **Current state**
 
 - `package.json` `postinstall` runs `dotnet publish Fable.Daemon/Fable.Daemon.fsproj -c Release --ucr -p:PublishReadyToRun=true -o ./bin` on the consumer's machine. The npm package therefore ships F# sources (`files` includes `Fable.Daemon/**/*.fs`, `Directory.*.props`) rather than a built daemon.
@@ -70,6 +72,8 @@ Order is a rough suggestion: the first three unblock building locally and shrink
 
 ## 4. Audit the Vite integration
 
+_2026-08-29: on Vite 8 (rolldown). The JSX post-transform now uses `transformWithOxc` from Vite instead of a direct `esbuild` dependency; `fable-library` is located via `import.meta.resolve`. The lifecycle/HMR questions below are still open._
+
 Questions to answer with the Vite 7 docs and, ideally, a small experiment in `sample-project`.
 
 **Lifecycle**