89 lines
2.8 KiB
JavaScript
89 lines
2.8 KiB
JavaScript
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// Copyright 2017 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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// The bug was that destructuring assignments which occur inside a lazy arrow
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// function parameter list were not rewritten.
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// Repro from the bug (slightly modified so that it doesn't produce a run-time
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// exception).
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(({x = {} = {}}) => {})({});
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// ... and without the parens.
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let a0 = ({x = {} = {}}) => {};
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a0({});
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// Testing that the destructuring assignments also work properly. The semantics
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// are: The value of the destructuring assignment is an object {myprop: 2115}
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// and 2115 also gets assigned to global_side_assignment. So the default value
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// for x is {myprop: 2115}. This is the value which x will have if the function
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// is called with an object which doesn't have property x.
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let called = false;
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let global_side_assignment = undefined;
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(({x = {myprop: global_side_assignment} = {myprop: 2115}}) => {
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assertTrue('myprop' in x);
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assertEquals(2115, x.myprop);
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called = true;
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})({});
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assertTrue(called);
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assertEquals(2115, global_side_assignment);
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// If the parameter is an object which has property x, the default value is not
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// used.
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called = false;
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global_side_assignment = undefined;
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(({x = {myprop: global_side_assignment} = {myprop: 2115}}) => {
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assertEquals(3000, x);
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called = true;
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})({x: 3000});
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assertTrue(called);
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// Global side assignment doesn't happen, since the default value was not used.
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assertEquals(undefined, global_side_assignment);
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// Different kinds of lazy arrow functions (it's actually a bit weird that the
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// above functions are lazy, since they are parenthesized).
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called = false;
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global_side_assignment = undefined;
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let a1 = ({x = {myprop: global_side_assignment} = {myprop: 2115}}) => {
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assertTrue('myprop' in x);
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assertEquals(2115, x.myprop);
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called = true;
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}
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a1({});
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assertTrue(called);
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assertEquals(2115, global_side_assignment);
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called = false;
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global_side_assignment = undefined;
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let a2 = ({x = {myprop: global_side_assignment} = {myprop: 2115}}) => {
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assertEquals(3000, x);
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called = true;
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}
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a2({x: 3000});
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assertTrue(called);
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assertEquals(undefined, global_side_assignment);
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// We never had a problem with non-arrow functions, but testing them too for
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// completeness.
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called = false;
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global_side_assignment = undefined;
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function f1({x = {myprop: global_side_assignment} = {myprop: 2115}}) {
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assertTrue('myprop' in x);
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assertEquals(2115, x.myprop);
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assertEquals(2115, global_side_assignment);
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called = true;
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}
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f1({});
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assertTrue(called);
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assertEquals(2115, global_side_assignment);
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called = false;
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global_side_assignment = undefined;
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function f2({x = {myprop: global_side_assignment} = {myprop: 2115}}) {
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assertEquals(3000, x);
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called = true;
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}
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f2({x: 3000});
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assertTrue(called);
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assertEquals(undefined, global_side_assignment);
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