fix npm compile script

tracker/tracker/checkver.js

@@ -0,0 +1,7 @@
+const semver = require("semver");
+const { engines } = require("./package");
+const version = engines.node;
+if (!semver.satisfies(process.version, version)) {
+    console.error(`Required node version ${version}, got ${process.version}.`)
+    process.exit(1);
+}

tracker/tracker/package.json

@@ -18,9 +18,9 @@
     "clean": "rm -Rf build && rm -Rf lib && rm -Rf cjs",
     "tsc": "tsc -b src/main && tsc -b src/webworker && tsc --project src/main/tsconfig-cjs.json",
     "rollup": "rollup --config rollup.config.js",
-    "compile": "node --experimental-json-modules compile.js",
+    "compile": "node --experimental-modules --experimental-json-modules compile.js",
     "build": "npm run clean && npm run tsc && npm run rollup && npm run compile",
-    "prepare": "npm run build"
+    "prepare": "node checkver.js && npm run build"
   },
   "devDependencies": {
     "@babel/core": "^7.10.2",
@@ -37,9 +37,13 @@
     "replace-in-files": "^2.0.3",
     "rollup": "^2.17.0",
     "rollup-plugin-terser": "^6.1.0",
+    "semver": "^6.3.0",
     "typescript": "^3.9.5"
   },
   "dependencies": {
     "error-stack-parser": "^2.0.6"
+  },
+  "engines": {
+    "node": ">=12"
   }
 }