Promise Semaphore
npm install promaphore
const Semaphore = require('promaphore')
const s = new Semaphore(2) // 2 is the max operation count
if (await s.wait()) { // wait for the to enter the block (only 2 can be in here at once)
s.signal() // signal that you are exiting the block
}
If you want to await all pending operations do await s.flush()
If you want to signal all pending waits do s.destroy()
MIT