left-hand-side-private-reference-readonly-accessor-property-nullish.js (1845B)
1 // This file was procedurally generated from the following sources: 2 // - src/logical-assignment-private/nullish.case 3 // - src/logical-assignment-private/default/getter.template 4 /*--- 5 description: Nullish-coalescing assignment with target being a private reference (to an accessor property with getter) 6 esid: sec-assignment-operators-runtime-semantics-evaluation 7 features: [class-fields-private, logical-assignment-operators] 8 flags: [generated] 9 info: | 10 sec-property-accessors-runtime-semantics-evaluation 11 MemberExpression : MemberExpression `.` PrivateIdentifier 12 13 1. Let _baseReference_ be the result of evaluating |MemberExpression|. 14 2. Let _baseValue_ be ? GetValue(_baseReference_). 15 3. Let _fieldNameString_ be the StringValue of |PrivateIdentifier|. 16 4. Return ! MakePrivateReference(_baseValue_, _fieldNameString_). 17 18 PutValue (V, W) 19 ... 20 5.b. If IsPrivateReference(_V_) is *true*, then 21 i. Return ? PrivateSet(_baseObj_, _V_.[[ReferencedName]], _W_). 22 23 PrivateSet (O, P, value) 24 ... 25 5.a. Assert: _entry_.[[Kind]] is ~accessor~. 26 b. If _entry_.[[Set]] is *undefined*, throw a *TypeError* exception. 27 28 29 sec-assignment-operators-runtime-semantics-evaluation 30 AssignmentExpression : LeftHandSideExpression ??= AssignmentExpression 31 1. Let _lref_ be the result of evaluating |LeftHandSideExpression|. 32 2. Let _lval_ be ? GetValue(_lref_). 33 3. If _lval_ is neither *undefined* nor *null*, return _lval_. 34 ... 35 6. Perform ? PutValue(_lref_, _rval_). 36 7. Return _rval_. 37 ---*/ 38 39 40 class C { 41 get #field() { 42 return null; 43 } 44 compoundAssignment() { 45 return this.#field ??= 1; 46 } 47 } 48 49 const o = new C(); 50 assert.throws(TypeError, () => o.compoundAssignment(), "PutValue throws when storing the result if no setter"); 51 52 reportCompare(0, 0);