What would a 1JS-friendly strict mode look like?

Caitlin Potter caitpotter88 at gmail.com
Thu Dec 18 08:50:47 PST 2014



> On Dec 18, 2014, at 10:54 AM, Mark S. Miller <erights at google.com> wrote:
> 
> 
> 
> On Thu, Dec 18, 2014 at 4:46 AM, Alex Kocharin <alex at kocharin.ru <mailto:alex at kocharin.ru>> wrote:
>  
>  
> 16.12.2014, 17:04, "Andrea Giammarchi" <andrea.giammarchi at gmail.com <mailto:andrea.giammarchi at gmail.com>>:
>> 
>> 
>> On Tue, Dec 16, 2014 at 1:50 PM, Felipe Nascimento de Moura <felipenmoura at gmail.com <mailto:felipenmoura at gmail.com>> wrote:
>>  
>> function () {
>>     use strict, safe;
>> }
>>  
>> This could allow us to even add some extra scoped-options, such as a safe mode..
>>  
>>  
>> I'm quite sure we've discussed already other directives and the unanimous answer here was "NO, 'use strict' is already problematic"
>>  
>  
> It's problematic mostly because it can't be turned off when it's needed.
> 
> When is this needed?
> 

It would be nice for testing (engines and applications), at any rate.

If you have similar behaviour for strict and non-strict modes:

```
[true, false].forEach(function someUnitTest(scopeMode) {
  Reflect.setStrictMode(scopeMode);

  assertEquals(“quantum puppies”, doTheThing());
});
```

vs

```
(function someUnitTestStrictMode() {
  “use strict”;
  assertEquals(“quantum puppies”, doTheThing());
})();

(function someUnitTestSlappyMode() {
  assertEquals(“quantum puppies”, doTheThing());
})();
```

>  
> So another directive like "use nostrict" would be welcome imho. Especially in modules when "strict" is on by default.
> 
> 
>     //... strict context
>     (1,eval)("...sloppy code...");
>     //... strict context

eval has other implications, so it doesn’t always accomplish what you want :( Plus, the contents are a lot harder to read in most text editors ;)

>  
>  
> I think we should either deprecate one of the modes, or officially support multiple modes and provide a method to switch between them.
> 
> Feel free to consider sloppy mode deprecated. I do.

Well sure, but unfortunately it’s not going to just disappear :(

>  
>  
> 
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> 
> -- 
>     Cheers,
>     --MarkM
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