Error serialization

Category: JavaScript
Type: New or changed feature
Status: Enabled by default (Chrome 77)
Intent stage: Evaluate readiness to ship

Summary

Enables serialization of errors, specifically, DOMException, Error, EvalError, RangeError, ReferenceError, SyntaxError, TypeError, and URIError. An example of where this capability may be used is to pass an Error to a worker using PostMessage().

Motivation

The primary motivation is Transferable Streams. For example, when we see a read error, we need to pass the error to the remote end.

Standards & signals

Specification: https://html.spec.whatwg.org/multipage/
Firefox: Positive — Some developers say they are fine with the idea.
Safari: No signal
Web developers: No signals
Tracking bug: https://bugs.chromium.org/p/chromium/issues/detail?id=970079

Docs: https://github.com/whatwg/html/pull/4665 https://github.com/heycam/webidl/pull/732

Explainers: https://github.com/whatwg/html/issues/4268

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