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42 lines
1.1 KiB
JavaScript
42 lines
1.1 KiB
JavaScript
// Copyright (C) 2018 Kevin Gibbons. All rights reserved.
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// This code is governed by the BSD license found in the LICENSE file.
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/*---
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esid: sec-super-keyword-runtime-semantics-evaluation
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description: >
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when calling `super()` for a second time in a derived class, the super constructor is run twice but the field initializers are only run once
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info: |
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[...]
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6. Let result be ? Construct(func, argList, newTarget).
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[...]
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10. Perform ? thisER.BindThisValue(result).
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11. Perform ? InitializeInstanceFields(result, F).
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[...]
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features: [class-fields-public]
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---*/
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var baseCtorCalled = 0;
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var fieldInitCalled = 0;
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class Base {
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constructor() {
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++baseCtorCalled;
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}
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}
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var C = class extends Base {
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field = ++fieldInitCalled;
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constructor() {
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assert.sameValue(baseCtorCalled, 0);
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assert.sameValue(fieldInitCalled, 0);
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super();
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assert.sameValue(baseCtorCalled, 1);
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assert.sameValue(fieldInitCalled, 1);
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assert.throws(ReferenceError, () => super());
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}
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};
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new C();
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assert.sameValue(baseCtorCalled, 2);
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assert.sameValue(fieldInitCalled, 1);
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