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'use strict';
var call = require('../internals/function-call');
var aCallable = require('../internals/a-callable');
var isCallable = require('../internals/is-callable');
var anObject = require('../internals/an-object');
var $TypeError = TypeError;
// `Map.prototype.upsert` method
// https://github.com/thumbsupep/proposal-upsert
module.exports = function upsert(key, updateFn /* , insertFn */) {
var map = anObject(this);
var get = aCallable(map.get);
var has = aCallable(map.has);
var set = aCallable(map.set);
var insertFn = arguments.length > 2 ? arguments[2] : undefined;
var value;
if (!isCallable(updateFn) && !isCallable(insertFn)) {
throw $TypeError('At least one callback required');
}
if (call(has, map, key)) {
value = call(get, map, key);
if (isCallable(updateFn)) {
value = updateFn(value);
call(set, map, key, value);
}
} else if (isCallable(insertFn)) {
value = insertFn();
call(set, map, key, value);
} return value;
};