[interpreter] Run JS tests via node.js (#1595)

Author: rossberg

.github/workflows/main.yml

@@ -19,6 +19,10 @@ jobs:
         with:
           ocaml-compiler: 4.12.x
       - run: opam install --yes ocamlbuild.0.14.0
+      - name: Setup Node.js
+        uses: actions/setup-node@v1
+        with:
+          node-version: 18.x
       - run: cd interpreter && opam exec make all
 
   ref-interpreter-js-library:

interpreter/Makefile

@@ -23,7 +23,7 @@ FLAGS = 	-lexflags -ml -cflags '-w +a-4-27-42-44-45-70 -warn-error +a-3'
 OCBA =		ocamlbuild $(FLAGS) $(DIRS:%=-I %)
 OCB =		$(OCBA) $(LIBS:%=-libs %)
 JSO =		js_of_ocaml -q --opt 3
-JS =		# set to JS shell command to run JS tests
+JS =		node  # set to JS shell command to run JS tests, empty to skip
 
 
 # Main targets