rollup -p @rollup/plugin-commonjs -f cjs -o dist/index.js src/async.js
rollup -p @rollup/plugin-commonjs -f es -o dist/index.mjs src/async.js
rollup -p @rollup/plugin-commonjs -f cjs -o sync/index.js src/sync.js
rollup -p @rollup/plugin-commonjs -f es -o sync/index.mjs src/sync.js
