Intent to Ship: JSON.parse source text access

[Shu-yu Guo]

Contact emails

s...@chromium.org

Explainer

https://github.com/tc39/proposal-json-parse-with-source/blob/master/README.md

Specification

https://tc39.es/proposal-json-parse-with-source

Summary

This proposal adds an object with a "source" property that is passed as the 3rd argument to the reviver function in JSON.parse. This property contains the raw source text for the value being parsed. It is designed to address the issue that JSON parsing is lossy, e.g. around BigInt values. For example, `JSON.parse(" 9999999999999999", (key, val, {source}) => BigInt(source))`.

Blink component

Blink>JavaScript>Language

TAG review

TAG review status

Not applicable

Risks

Interoperability and Compatibility

Gecko: Positive This is a Stage 3 TC39 proposal.

WebKit: Positive This is a Stage 3 TC39 proposal.

Web developers: No signals

Other signals:

WebView application risks

Does this intent deprecate or change behavior of existing APIs, such that it has potentially high risk for Android WebView-based applications?

Debuggability

The 3rd argument being added will be debugged as any JavaScript function argument.

Will this feature be supported on all six Blink platforms (Windows, Mac, Linux, Chrome OS, Android, and Android WebView)?

Yes

Is this feature fully tested by web-platform-tests?

In test262: https://github.com/tc39/test262/pull/3806

Flag name

--harmony-json-parse-with-source

Requires code in //chrome?

False

Tracking bug

https://bugs.chromium.org/p/v8/issues/detail?id=12955

Estimated milestones

Shipping on desktop	114
DevTrial on desktop	108

DevTrial on Android

108

Anticipated spec changes

None

Link to entry on the Chrome Platform Status

https://chromestatus.com/feature/5121582673428480

This intent message was generated by Chrome Platform Status.

[Yoav Weiss]

LGTM1

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[Mike Taylor]

LGTM2

To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/CAL5BFfX0r0q3vK%2ByUAHNCzeK56jd62bAsC9_TBETw%3DVkWZ27-Q%40mail.gmail.com.

[Daniel Bratell]

LGTM3

/Daniel

To view this discussion on the web visit https://groups.google.com/a/chromium.org/d/msgid/blink-dev/0d468dd2-336e-52cb-5cdd-85b29f53b407%40chromium.org.