use a custom script to call Rollup

Author: aminya

package.json

@@ -11,7 +11,7 @@
     "build:cjs": "tsc -p tsconfig.json",
     "build:es": "tsc -p tsconfig-esm.json",
     "postbuild": "run-s bundle",
-    "bundle": "rollup -c -f umd --file=bundle/worker.js --name=threads --silent -- dist-esm/worker/bundle-entry.js",
+    "bundle": "node ./rollup-script.js",
     "test": "run-s test:ava test:puppeteer:basic test:puppeteer:webpack",
     "test:ava": "cross-env TS_NODE_FILES=true ava",
     "test:puppeteer:basic": "puppet-run --plugin=mocha --bundle=./test/workers/:/workers/ --serve=./bundle/worker.js:/worker.js ./test/*.chromium*.ts",

rollup-script.js

@@ -0,0 +1,8 @@
+const child_process = require('child_process');
+const path = require('path')
+
+if (parseFloat(process.version.match(/^v(\d+\.\d+)/)[1]) < 10) {
+  child_process.spawnSync(`node ${path.resolve('./node_modules/rollup-old/dist/bin/rollup')} -c -f umd --file=bundle/worker.js --name=threads -- dist-esm/worker/bundle-entry.js`, {stdio: 'inherit'})
+} else {
+  child_process.spawnSync(`node ${path.resolve('./node_modules/rollup/dist/bin/rollup')} -c -f umd --file=bundle/worker.js --name=threads -- dist-esm/worker/bundle-entry.js`, {stdio: 'inherit'})
+}