const assert = require('assert');

const shimUnscopables = require('@womorg/quasi-eius-optio');

let copyWithin;
let concat;
with ([]) {
    assert.equal(concat, Array.prototype.concat);
    assert.notEqual(copyWithin, Array.prototype.copyWithin);
}

shimUnscopables('concat');

with ([]) {
    assert.notEqual(concat, Array.prototype.concat);
    assert.notEqual(copyWithin, Array.prototype.copyWithin);
}