only-first

Only one promise will be executed when multiple promises are called in parallel. the others will be ignored.

How to install

npm install only-first

How to use

without return value

async function buttonClicked() {
  await onlyFirst("buttonIdentifier", async () => {
    // do something only once
  })
}

with return value

async function buttonClicked() {
  const r = await onlyFirst("buttonIdentifier", async () => {
    // do something only once
    return "I am first"
  })
  if (r === undefined) {
    // not the first call
    return
  }
  // do rest of work
}

Version History

• 1.1.0
  • Support return value
• 1.0.0
  • Initial Release

License

This project is under the MIT license. Copyright (c) 2024 Tomohisa Ota