Use older Jest for Node.js 12

Why:

- Allow tests to run on oldest targeted ECMAScript version

This change addresses the need by:

- Add script to run tests against older JS versions

package.json

@@ -13,6 +13,7 @@
         "build": "grunt build",
         "start": "nodemon utils/server.js",
         "test": "jest",
+        "test:allVersions": "./utils/test.sh",
         "prettier": "npx prettier --write src/**/*.* css/**/*.*",
         "lint": "npx eslint src",
         "lint:fix": "npx eslint --fix src"
@@ -33,7 +34,7 @@
     },
     "homepage": "https://github.com/jagenjo/litegraph.js#readme",
     "devDependencies": {
-        "@types/jest": "^29.5.0",
+        "@types/jest": "^28.1.3",
         "eslint": "^8.37.0 ",
         "eslint-plugin-jest": "^27.2.1",
         "express": "^4.17.1",
@@ -42,7 +43,7 @@
         "grunt-cli": "^1.2.0",
         "grunt-closure-tools": "^1.0.0",
         "grunt-contrib-concat": "^1.0.1",
-        "jest": "^29.5.0",
+        "jest": "^28.1.3",
         "nodemon": "^1.19.4",
         "rimraf": "^2.7.1"
     }

utils/test.sh

@@ -0,0 +1,16 @@
+#!/bin/bash
+
+set -eo pipefail
+cd "$(dirname "$(readlink -f "${BASH_SOURCE[0]}")")"
+
+export NVM_DIR=$HOME/.nvm
+source "$NVM_DIR/nvm.sh"
+
+# This are versions 12, 14, 16, 18
+NODE_VERSIONS=("lts/erbium" "lts/fermium" "lts/gallium" "lts/hydrogen")
+
+for NODE_VERSION in "${NODE_VERSIONS[@]}"; do
+  nvm install "$NODE_VERSION"
+  nvm exec "$NODE_VERSION" npm install
+  nvm exec "$NODE_VERSION" npm test
+done