Module 18684

function(e,t,n){"use strict";var r=n(834647),a=n(280173),o=n(381568);r({target:"Map",proto:!0,real:!0,forced:!0},{keyOf:function(e){var t=o(a(this),function(t,n){if(t===e)return{key:n}},!0);return t&&t.key}})}