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Improve compatibility with + add test for DOMException #3

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Improve compatibility with + add test for DOMException #3

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fe4d3cf
Improve compatibility with + add test for DOMException
lionel-rowe Nov 13, 2024
13c3634
Revert to closer to previous logic; safer domExceptionClonable
lionel-rowe Nov 13, 2024
4729c92
Check instanceof instead of toString for DOMException
lionel-rowe Nov 17, 2024
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16 changes: 15 additions & 1 deletion implementation.js
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Original file line number Diff line number Diff line change
Expand Up @@ -14,18 +14,32 @@ var $toString = callBound('Object.prototype.toString');
var stackDesc = gOPD($Error.prototype, 'stack');
var stackGetter = stackDesc && stackDesc.get && callBind(stackDesc.get);

var domExceptionClonable = !!(
$structuredClone
&& typeof DOMException === 'function'
&& $structuredClone(new DOMException()) instanceof $Error
);

module.exports = function isError(arg) {
if (!arg || (typeof arg !== 'object' && typeof arg !== 'function')) {
return false; // step 1
}

if (typeof DOMException === 'function' && arg instanceof DOMException) {
return true;
}

if (isNativeError) { // node 10+
return isNativeError(arg);
}

if ($structuredClone) {
try {
return $structuredClone(arg) instanceof $Error;
if ($structuredClone(arg) instanceof $Error) {
return true;
} else if (domExceptionClonable) {
return false;
}
} catch (e) {
return false;
}
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3 changes: 2 additions & 1 deletion test/tests.js
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Original file line number Diff line number Diff line change
Expand Up @@ -60,7 +60,8 @@ module.exports = function (isError, t) {
new URIError(),
new EvalError(),
typeof AggregateError === 'function' ? new AggregateError([]) : [],
typeof SuppressedError === 'function' ? new SuppressedError() : []
typeof SuppressedError === 'function' ? new SuppressedError() : [],
typeof DOMException === 'function' ? new DOMException() : []
), function (error) {
st.equal(isError(error), true, inspect(error) + ' is an Error object');
});
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