stack.js - mozsearch

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let tag = new WebAssembly.Tag({parameters: []});

function construct(options) {

	return new WebAssembly.Exception(tag, [], options);

function noStack(options) {

	assertEq(construct(options).stack, undefined, 'no stack');

function hasStack(options) {

	assertEq(typeof construct(options).stack === 'string', true, 'has stack');

// Test valid option constructors

noStack(undefined);

noStack(null);

noStack({});

noStack({traceStack: false});

noStack({traceStack: 0});

hasStack({traceStack: true});

hasStack({traceStack: 1});

// Test invalid option constructors

assertErrorMessage(() => construct('not an object'), TypeError, /cannot be converted/);

// Test that 'stack' is read-only

let exception = construct({traceStack: true});

exception.stack = 0;

assertEq(typeof exception.stack === 'string', true, 'is read-only');