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Error.isError

Category

JavaScript

Type

Chromium catches up

Status

In developer trial (Behind a flag) (Chrome 134)

Intent stage

None

• Breaking change: No
• Enterprise impact: None
• Chromium flag: --js-error-iserror
• Spec maturity: Working draft
• Web Platform Tests: Yes

WPT details: https://github.com/tc39/test262/pull/4266 https://github.com/web-platform-tests/wpt/pull/49133

Summary

Adds the Error.isError(obj) static method. It returns true for JS native errors and DOMExceptions, and false otherwise.

Motivation

See https://github.com/tc39/proposal-is-error/blob/main/README.md

Standards & signals

• Specification: https://tc39.es/proposal-is-error
• Firefox: Positive — This is a Stage 3 TC39 proposal.
• Safari: Positive — This is a Stage 3 TC39 proposal.
• Web developers: No signals

Ecosystem

• Web Platform Tests: https://wpt.fyi/results/?q=error-iserror
• Chrome Platform Showcase: https://chrome-platform-showcase.paulkinlan-ea.deno.net/features
• GenDN reference: https://gendn.paulkinlan-ea.deno.net/features
• chrome.dev demos search: https://www.google.com/search?q=site%3Achrome.dev+Error.isError
• MDN Web Docs: https://developer.mozilla.org/en-US/search?q=Error.isError
• Baseline status: https://webstatus.dev/?q=Error.isError

View on chromestatus.com