structured-cloning-error-stack.window.js

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This test has a WPT meta file that expects 2 subtest issues.
This WPT test may be referenced by the following Test IDs:
- /html/infrastructure/safe-passing-of-structured-data/structured-cloning-error-stack.window.html - WPT Dashboard Interop Dashboard

// https://tc39.es/proposal-error-stack-accessor/

// https://html.spec.whatwg.org/multipage/structured-data.html#structuredserializeinternal

//

// The [[Stack]] internal slot is now normatively serialized and deserialized

// as part of the structured clone algorithm for Error objects.

"use strict";

test(() => {

  const error = new Error("some message");

  assert_equals(typeof error.stack, "string", "original stack must be a string");

  const cloned = structuredClone(error);

  assert_equals(typeof cloned.stack, "string", "cloned stack must be a string");

  assert_equals(cloned.stack, error.stack, "cloned stack must equal original stack");

}, "structuredClone() preserves .stack on Error");

test(() => {

  const error = new TypeError("some message");

  assert_equals(typeof error.stack, "string", "original stack must be a string");

  const cloned = structuredClone(error);

  assert_equals(typeof cloned.stack, "string", "cloned stack must be a string");

  assert_equals(cloned.stack, error.stack, "cloned stack must equal original stack");

}, "structuredClone() preserves .stack on TypeError");

test(() => {

  const error = new RangeError("some message");

  assert_equals(typeof error.stack, "string", "original stack must be a string");

  const cloned = structuredClone(error);

  assert_equals(typeof cloned.stack, "string", "cloned stack must be a string");

  assert_equals(cloned.stack, error.stack, "cloned stack must equal original stack");

}, "structuredClone() preserves .stack on RangeError");

test(() => {

  const error = new EvalError("some message");

  assert_equals(typeof error.stack, "string", "original stack must be a string");

  const cloned = structuredClone(error);

  assert_equals(typeof cloned.stack, "string", "cloned stack must be a string");

  assert_equals(cloned.stack, error.stack, "cloned stack must equal original stack");

}, "structuredClone() preserves .stack on EvalError");

test(() => {

  const error = new ReferenceError("some message");

  assert_equals(typeof error.stack, "string", "original stack must be a string");

  const cloned = structuredClone(error);

  assert_equals(typeof cloned.stack, "string", "cloned stack must be a string");

  assert_equals(cloned.stack, error.stack, "cloned stack must equal original stack");

}, "structuredClone() preserves .stack on ReferenceError");

test(() => {

  const error = new SyntaxError("some message");

  assert_equals(typeof error.stack, "string", "original stack must be a string");

  const cloned = structuredClone(error);

  assert_equals(typeof cloned.stack, "string", "cloned stack must be a string");

  assert_equals(cloned.stack, error.stack, "cloned stack must equal original stack");

}, "structuredClone() preserves .stack on SyntaxError");

test(() => {

  const error = new URIError("some message");

  assert_equals(typeof error.stack, "string", "original stack must be a string");

  const cloned = structuredClone(error);

  assert_equals(typeof cloned.stack, "string", "cloned stack must be a string");

  assert_equals(cloned.stack, error.stack, "cloned stack must equal original stack");

}, "structuredClone() preserves .stack on URIError");

test(() => {

  const error = new DOMException("some message", "SyntaxError");

  assert_equals(typeof error.stack, "string", "original stack must be a string");

  const cloned = structuredClone(error);

  assert_equals(typeof cloned.stack, "string", "cloned stack must be a string");

  assert_equals(cloned.stack, error.stack, "cloned stack must equal original stack");

}, "structuredClone() preserves .stack on DOMException");

test(() => {

  let caught;

  try {

    document.createElement("");

  } catch (e) {

    caught = e;

  assert_true(caught instanceof DOMException, "must be a DOMException");

  assert_equals(typeof caught.stack, "string", "original stack must be a string");

  const cloned = structuredClone(caught);

  assert_equals(typeof cloned.stack, "string", "cloned stack must be a string");

  assert_equals(cloned.stack, caught.stack, "cloned stack must equal original stack");

}, "structuredClone() preserves .stack on a thrown DOMException");

test(() => {

  const error = new Error("some message");

  const cloned = structuredClone(error);

  assert_false(cloned.hasOwnProperty("stack"),

    "cloned error must not have an own stack property");

  assert_equals(cloned.stack, error.stack,

    "cloned stack must still be accessible via the accessor");

}, "structuredClone() preserves .stack via [[Stack]] internal slot, not as own property");