Can users set strict mode in JSX?

[yosuke-furukawa]

I published a JSX module implements Object.freeze in yesterday.

https://github.com/yosuke-furukawa/freezer.jsx

However, Object.freeze do not throw exception in non-strict mode.

I would like to know how to set 'use strict' in JSX.

[yosuke-furukawa]

I have found a way to set strict mode in node.js.

--use_strict option is enabled in node.js runtime.
If this option enable, the program become strict mode inspite of "use strict"; or not.

[kazuho]

Thank you for your contribution. Did the generated code run under strict mode?

IMO we should better always set use strict in the generated code, but I am not confident enough that it would not introduce any compatibility problem nor have any impact on execution speed.

[kazuho]

FYI The code generated by JSX is not compatible with strict mode. You can see some tests failing in branch: https://github.com/jsx/JSX/tree/kazuho/experiments/use-strict

[nyuichi]

@kazuho

As tested your branch on my environment (v0.11.11), I don't see any warning or test failures. Which test case did you see failing?

[kazuho]

@yosuke-furukawa @wasabiz

Sorry.

You need to run JSX_RUNJS='node --use_strict' make test on the aforementioned branch (kazuho/experiments/use-strict).

I have fixed subtle issues re compatibility with strict mode, but there are still problems.