Add prettier2/prettier3 scripts for sanity checks

package.json

@@ -38,7 +38,9 @@
     "playground": "npx http-server playground",
     "prepare": "husky install",
     "prerelease": "scripts/prerelease",
-    "prettier": "prettier --plugin . --parser=liquid-html",
+    "prettier": "scripts/prettier",
+    "prettier2": "cross-env PRETTIER_MAJOR=2 scripts/prettier",
+    "prettier3": "cross-env PRETTIER_MAJOR=3 scripts/prettier",
     "test": "node_modules/.bin/mocha '{src,test}/**/*.spec.ts'",
     "test:3": "cross-env PRETTIER_MAJOR=3 yarn test",
     "test:idempotence": "cross-env TEST_IDEMPOTENCE=true node_modules/.bin/mocha 'test/**/*.spec.ts'",

scripts/prettier

@@ -0,0 +1,27 @@
+#!/usr/bin/env bash
+
+cleanup() {
+  rm node_modules/prettier
+}
+
+run() {
+  echo "$@"
+  $@
+}
+
+if [[ $PRETTIER_MAJOR = 3 ]]; then
+  prettier='./prettier3'
+  cmd="./node_modules/prettier3/bin/prettier.cjs --plugin ./dist/index.js --parser=liquid-html --ignore-path=.prettierignore"
+else
+  prettier='./prettier2'
+  cmd="./node_modules/prettier2/bin-prettier.js --plugin . --parser=liquid-html"
+fi
+
+# format with prettier2
+ln -s $prettier node_modules/prettier
+
+# cleanup when done
+trap cleanup EXIT
+
+# run command for version
+run $cmd "$@"