ci(): reintroduce node 14 testing (fabricjs#8232)

.github/workflows/tests.yml

@@ -36,7 +36,7 @@ jobs:
         # For more information see:
         # https://help.github.com/actions/language-and-framework-guides/using-nodejs-with-github-actions
         # supported Node.js release schedule: https://nodejs.org/en/about/releases/
-        node-version: [16.x]
+        node-version: [14.x, 16.x] 
         suite: [unit, visual]
     steps:
     - uses: actions/checkout@v2

package.json

@@ -81,6 +81,7 @@
     "@types/node": "^17.0.21",
     "@typescript-eslint/eslint-plugin": "^5.29.0",
     "@typescript-eslint/parser": "^5.29.0",
+    "abort-controller": "^3.0.0",
     "auto-changelog": "^2.3.0",
     "busboy": "^1.6.0",
     "chalk": "^2.4.1",

test/node_test_setup.js

@@ -3,6 +3,13 @@ var chalk = require('chalk');
 var diff = require('deep-object-diff').diff;
 var commander = require('commander');
 
+// TODO remove block and dependency when node 14 fades out
+// node 14 AbortController polyfill for tests
+if (!global.AbortController) {
+  require("abort-controller/polyfill");
+}
+
+
 commander.program
   .option('-d, --debug', 'debug visual tests by overriding refs (golden images) in case of visual changes', false)
   .option('-r, --recreate', 'recreate visual refs (golden images)', false)