src/compound-assignment-private/default/method.template

// Copyright 2021 the V8 project authors; 2022 Igalia S.L. All rights reserved.
// This code is governed by the BSD license found in the LICENSE file.

/*---
path: language/expressions/compound-assignment/left-hand-side-private-reference-method-
esid: sec-assignment-operators-runtime-semantics-evaluation
info: |
  sec-assignment-operators-runtime-semantics-evaluation
  AssignmentExpression : LeftHandSideExpression AssignmentOperator AssignmentExpression
    1. Let _lref_ be the result of evaluating |LeftHandSideExpression|.
    2. Let _lval_ be ? GetValue(_lref_).
    ...
    7. Let _r_ be ApplyStringOrNumericBinaryOperator(_lval_, _opText_, _rval_).
    8. Perform ? PutValue(_lref_, _r_).
    9. Return _r_.

  sec-property-accessors-runtime-semantics-evaluation
  MemberExpression : MemberExpression `.` PrivateIdentifier

    1. Let _baseReference_ be the result of evaluating |MemberExpression|.
    2. Let _baseValue_ be ? GetValue(_baseReference_).
    3. Let _fieldNameString_ be the StringValue of |PrivateIdentifier|.
    4. Return ! MakePrivateReference(_baseValue_, _fieldNameString_).

  PutValue (V, W)
    ...
    5.b. If IsPrivateReference(_V_) is *true*, then
      i. Return ? PrivateSet(_baseObj_, _V_.[[ReferencedName]], _W_).

  PrivateSet (O, P, value)
    ...
    4. Else if _entry_.[[Kind]] is ~method~, then
      a. Throw a *TypeError* exception.

name: to a private method
features: [class-fields-private]
---*/

class C {
  #privateMethod() {}
  compoundAssignment() {
    return this.#privateMethod /*{operator}*/ 1;
  }
}

const o = new C();
assert.throws(TypeError, () => o.compoundAssignment(), "PutValue throws when storing the result in a method private reference");