Simplify CI caching and development setup

.github/workflows/opam.yml

@@ -3,8 +3,8 @@ name: opam CI
 on:
   pull_request:
   push:
-   branches:
-     - main
+    branches:
+      - main
 
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
@@ -19,9 +19,6 @@ jobs:
         os:
           - ubuntu-latest
           - macos-latest
-          # - windows-latest
-          # It seems like dune 3.8 isn't available under opam-repository-mingw for Windows
-          # disabling this for now
 
         ocaml-compiler:
           - ocaml-base-compiler.5.5.2
@@ -32,35 +29,22 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v6
 
-      - name: Load opam cache when not Windows
-        if: runner.os != 'Windows'
-        id: opam-cache
-        uses: actions/cache/restore@v5
-        with:
-          path: ~/.opam
-          key: opam-${{ matrix.os }}-${{ matrix.ocaml-compiler }}-${{ hashFiles('**.opam') }}
-
-      - name: Load opam cache when Windows
-        if: runner.os == 'Windows'
-        id: opam-cache-windows
-        uses: actions/cache/restore@v5
-        with:
-          path: _opam
-          key: opam-${{ matrix.os }}-${{ matrix.ocaml-compiler }}-${{ hashFiles('**.opam') }}
-
       - name: Use OCaml ${{ matrix.ocaml-compiler }}
         uses: ocaml/setup-ocaml@v3
         with:
           ocaml-compiler: ${{ matrix.ocaml-compiler }}
-          dune-cache: true
 
       - name: Use Node.js
         uses: actions/setup-node@v6
         with:
           node-version: 24
+          cache: npm
+
+      - name: Install OCaml dependencies
+        run: opam install . --deps-only --with-test -y
 
-      - name: Install dependencies
-        run: make install
+      - name: Install JavaScript dependencies
+        run: npm ci
 
       - name: Build
         run: make build
@@ -70,17 +54,3 @@ jobs:
 
       - name: Jest
         run: make jest
-
-      - name: Save cache when not Windows
-        uses: actions/cache/save@v5
-        if: steps.opam-cache.outputs.cache-hit != 'true' && runner.os != 'Windows'
-        with:
-          path: ~/.opam
-          key: opam-${{ matrix.os }}-${{ matrix.ocaml-compiler }}-${{ hashFiles('**.opam') }}
-
-      - name: Save cache when Windows
-        uses: actions/cache/save@v5
-        if: steps.opam-cache-windows.outputs.cache-hit != 'true' && runner.os == 'Windows'
-        with:
-          path: _opam
-          key: opam-${{ matrix.os }}-${{ matrix.ocaml-compiler }}-${{ hashFiles('**.opam') }}

Makefile

@@ -1,4 +1,5 @@
 DUNE = opam exec -- dune
+OCAML_VERSION ?= 5.5.2
 
 .PHONY: help
 help: ## Print this help message
@@ -59,11 +60,11 @@ format-check: ## Checks if format is correct
 .PHONY: install
 install: ## Update the package dependencies when new deps are added to dune-project
 	@opam install . --deps-only --with-test --with-dev-setup -y
-	@npm install --force
+	@npm ci
 
-.PHONY: init
+.PHONY: create-switch
 create-switch: ## Create a local opam switch
-	@opam switch create . 5.5.2 --no-install -y
+	@opam switch create . $(OCAML_VERSION) --no-install -y
 
 .PHONY: init
 init: create-switch install ## Create a local opam switch, install deps

flake.nix

@@ -30,7 +30,7 @@
             buildDunePackage
             melange
             merlin
-            ppxlib_gt_0_37
+            ppxlib
             reason
             ;
           packages = rec {
@@ -58,7 +58,7 @@
                 merlin
                 pkgs.jq
               ];
-              propagatedBuildInputs = [ ppxlib_gt_0_37 ];
+              propagatedBuildInputs = [ ppxlib ];
             };
 
             reason-react = buildDunePackage {