[Webkit-unassigned] [Bug 174216] New: Update DOMException to the latest spec

[bugzilla-daemon at webkit.org]

https://bugs.webkit.org/show_bug.cgi?id=174216

            Bug ID: 174216
           Summary: Update DOMException to the latest spec
           Product: WebKit
           Version: Safari Technology Preview
          Hardware: Unspecified
                OS: Unspecified
            Status: NEW
          Severity: Normal
          Priority: P2
         Component: Bindings
          Assignee: webkit-unassigned at lists.webkit.org
          Reporter: d at domenic.me
                CC: cdumez at apple.com

For years the spec for DOMException has not matched what was implemented. We recently fixed this by converging on the majority behavior, in https://github.com/heycam/webidl/pull/378. Failing-in-Safari tests are available at:

- http://w3c-test.org/WebIDL/ecmascript-binding/es-exceptions/DOMException-constructor-behavior.any.html
- http://w3c-test.org/WebIDL/ecmascript-binding/es-exceptions/DOMException-constructor-behavior.any.html
- http://w3c-test.org/WebIDL/ecmascript-binding/es-exceptions/exceptions.html

The spec is at:

- https://heycam.github.io/webidl/#idl-DOMException
- https://heycam.github.io/webidl/#idl-DOMException

The following changes appear to be necessary to conform to the current spec:

- Use getters on the prototype instead of own data properties for message/code/name.
- Removing the toString() method and letting the default Error.prototype.toString() show through.
- ("should", not "must") capturing stack traces for DOMExceptions, like for other Error classes.

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