chore(compiler): Build JS version with 2 jobs on Windows (#1922)

Author: phated

compiler/esy.json

@@ -25,6 +25,7 @@
     "copy:exe": "cp #{$GRAINC_BIN_PATH} #{$GRAINDOC_BIN_PATH} #{$GRAINFORMAT_BIN_PATH} #{$GRAINLSP_BIN_PATH} #{$CLI_BIN_DIR}",
     "copy:js": "cp #{$GRAINC_JS_PATH} #{$GRAINDOC_JS_PATH} #{$GRAINFORMAT_JS_PATH} #{$GRAINLSP_JS_PATH}  #{$CLI_BIN_DIR}",
     "clean": "rm -rf #{self.root}/_esy",
+    "build:js": "esy b dune build @js --no-buffer #{os == 'windows' ? '-j 2' : ''}",
     "test": "#{$TEST_EXEC_PATH}",
     "test:js": "node #{$TEST_JS_PATH}",
     "format": "dune build @fmt --auto-promote",

compiler/package.json

@@ -19,7 +19,7 @@
     "prebuild": "npm run clean --workspace=@grain/cli",
     "build": "esy",
     "postbuild": "esy copy:exe",
-    "build:js": "esy b dune build @js --no-buffer",
+    "build:js": "esy build:js",
     "postbuild:js": "esy copy:js",
     "pretest": "npm run build",
     "test": "esy test",