npm project init
run *.ts file
node --loader ts-node/esm.mjs --experimental-top-level-await --no-warnings ./src/index.ts
package.json:
{
"scripts": {
"test": "jest --watch --onlyChanged",
"dev": "node --loader ts-node/esm.mjs --experimental-top-level-await --no-warnings "
},
npm run -s dev ./src/index.ts
test