tiny-once/dist/index.js

Very simple wrapper to run a function only once

"use strict";

function once(fn) {
  var options = arguments.length <= 1 || arguments[1] === undefined ? {} : arguments[1];

  var called = false;
  var result = void 0;

  return function () {
    if (called) {
      return options.cached ? result : null;
    }

    called = true;
    return result = fn.apply(options.context || this, arguments);
  };
}

module.exports = once;