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c8daa32e48
* Test object spread with Proxy * Test object spread with non-enumerable keys and Proxy * Test object rest with excluded keys and Proxy * Test object rest with non-enumerable keys and Proxy
54 lines
1.7 KiB
JavaScript
54 lines
1.7 KiB
JavaScript
// Copyright (C) 2021 Alexey Shvayka. 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-destructuring-binding-patterns-runtime-semantics-restbindinginitialization
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description: >
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Proxy's "getOwnPropertyDescriptor" trap is not invoked for excluded keys.
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info: |
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BindingRestProperty : ... BindingIdentifier
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[...]
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3. Perform ? CopyDataProperties(restObj, value, excludedNames).
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CopyDataProperties ( target, source, excludedItems )
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[...]
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5. Let keys be ? from.[[OwnPropertyKeys]]().
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6. For each element nextKey of keys in List order, do
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b. For each element e of excludedItems, do
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i. If SameValue(e, nextKey) is true, then
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1. Set excluded to true.
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c. If excluded is false, then
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i. Let desc be ? from.[[GetOwnProperty]](nextKey).
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[[OwnPropertyKeys]] ( )
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[...]
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7. Let trapResultArray be ? Call(trap, handler, « target »).
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8. Let trapResult be ? CreateListFromArrayLike(trapResultArray, « String, Symbol »).
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[...]
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23. Return trapResult.
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features: [object-rest, destructuring-binding, Proxy, Symbol]
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includes: [compareArray.js]
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---*/
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var excludedSymbol = Symbol("excluded_symbol");
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var includedSymbol = Symbol("included_symbol");
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var excludedKeys = [excludedSymbol, "excludedString", "0"];
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var includedKeys = [includedSymbol, "includedString", "1"];
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var ownKeysResult = [...excludedKeys, ...includedKeys];
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var getOwnKeys = [];
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var proxy = new Proxy({}, {
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getOwnPropertyDescriptor: function(_target, key) {
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getOwnKeys.push(key);
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},
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ownKeys: function() {
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return ownKeysResult;
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},
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});
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var {[excludedSymbol]: _, excludedString, 0: excludedIndex, ...rest} = proxy;
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assert.compareArray(getOwnKeys, includedKeys);
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