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'use strict';
var $ = require('../internals/export');
var IS_PURE = require('../internals/is-pure');
var anObject = require('../internals/an-object');
var bind = require('../internals/function-bind-context');
var getMapIterator = require('../internals/get-map-iterator');
var iterate = require('../internals/iterate');

// `Map.prototype.findKey` method
// https://github.com/tc39/proposal-collection-methods
$({ target: 'Map', proto: true, real: true, forced: IS_PURE }, {
  findKey: function findKey(callbackfn /* , thisArg */) {
    var map = anObject(this);
    var iterator = getMapIterator(map);
    var boundFunction = bind(callbackfn, arguments.length > 1 ? arguments[1] : undefined, 3);
    return iterate(iterator, function (key, value, stop) {
      if (boundFunction(value, key, map)) return stop(key);
    }, { AS_ENTRIES: true, IS_ITERATOR: true, INTERRUPTED: true }).result;
  }
});