install old rollup in a script

Author: aminya

rollup-script.js

@@ -2,6 +2,7 @@ const child_process = require('child_process');
 const path = require('path')
 
 if (parseFloat(process.version.match(/^v(\d+\.\d+)/)[1]) < 10) {
+  child_process.spawnSync(`npm install rollup@1`, {stdio: 'inherit'})
   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'})