src/class-elements/grammar-private-field-optional-chaining.case

// Copyright (C) 2020 Caio Lima (Igalia SL). All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
desc: PrivateName after '?.' is valid syntax
info: |
  Updated Productions

  OptionalChain[Yield, Await]:
    `?.` `[` Expression[+In, ?Yield, ?Await] `]`
    `?.` IdentifierName
    `?.` Arguments[?Yield, ?Await]
    `?.` TemplateLiteral[?Yield, ?Await, +Tagged]
    `?.` PrivateIdentifier
template: default
features: [class-fields-private, optional-chaining]
---*/

//- elements
#m = 'test262';

static access(obj) {
  return obj?.#m;
}
//- assertions

let c = new C();

assert.sameValue(C.access(c), 'test262');

assert.sameValue(C.access(null), undefined);
assert.sameValue(C.access(undefined), undefined);

assert.throws(TypeError, function() {
  C.access({});
}, 'accessed private field from an ordinary object');