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LibJS: Handle non-Error this object in Error.prototype.stack getter

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This is taken from the abandoned error stacks proposal, which
already serves as the source of truth for the setter. It only requires
the this value to be an object - if it's not an Error object, the getter
returns undefined.
I have not compared this behavior to the non-standard implementations of
the stack property in other engines, but presumably the spec authors
already did that work.

This change gets the Sentry browser SDK working to a point where it can
actually send uncaught exceptions via the API :^)
This commit is contained in:
Linus Groh 2022-03-15 14:19:20 +00:00 • committed by Andreas Kling
parent 37e988675f
commit fb60ada6ce
2 changed files with 32 additions and 7 deletions
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18
Userland/Libraries/LibJS/Tests/builtins/Error/Error.prototype.stack.js
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@ -1,4 +1,5 @@
const stackDescriptor = Object.getOwnPropertyDescriptor(Error.prototype, "stack");
const stackGetter = stackDescriptor.get;
const stackSetter = stackDescriptor.set;
describe("getter - normal behavior", () => {
@ -7,9 +8,9 @@ describe("getter - normal behavior", () => {
/^ at .*Error \(.*\/Error\.prototype\.stack\.js:\d+:\d+\)$/,
/^ at .+\/Error\/Error\.prototype\.stack\.js:\d+:\d+$/,
/^ at test \(.+\/test-common.js:557:21\)$/,
/^ at .+\/Error\/Error\.prototype\.stack\.js:5:33$/,
/^ at .+\/Error\/Error\.prototype\.stack\.js:6:33$/,
/^ at describe \(.+\/test-common\.js:534:21\)$/,
/^ at .+\/Error\/Error\.prototype\.stack\.js:4:38$/,
/^ at .+\/Error\/Error\.prototype\.stack\.js:5:38$/,
];
const values = [
{
@ -41,6 +42,19 @@ describe("getter - normal behavior", () => {
}
}
});
test("this value must be an object", () => {
expect(() => {
stackGetter.call("foo");
}).toThrowWithMessage(TypeError, "foo is not an object");
expect(() => {
stackGetter.call(42);
}).toThrowWithMessage(TypeError, "42 is not an object");
});
test("returns undefined when called with non-Error object this value", () => {
expect(stackGetter.call({})).toBeUndefined();
});
});
describe("setter - normal behavior", () => {