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44 lines
1.1 KiB
JavaScript
44 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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`this` is bound in the constructor of derived classes immediately before running initializers
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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 probeCtorThis;
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var thisDuringField;
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var thisFromProbe;
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var thisDuringCtor;
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class Base {
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constructor() {
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assert.throws(ReferenceError, probeCtorThis);
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}
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}
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var C = class extends Base {
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field = (thisDuringField = this, thisFromProbe = probeCtorThis());
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constructor() {
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probeCtorThis = () => this;
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assert.throws(ReferenceError, probeCtorThis);
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super();
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thisDuringCtor = this;
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}
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};
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var instance = new C();
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assert.sameValue(thisDuringField, instance);
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assert.sameValue(thisFromProbe, instance);
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assert.sameValue(thisDuringCtor, instance);
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