Thanks for your response Toon! Sorry for the late reply, I didn't get an
email about it for some reason.
Wrapping the code in a block worked! I had tried that previously but must
have messed it up somehow, so I'm glad I tried again.
On Wednesday, April 13, 2022 at 2:45:13 AM UTC-7 Toon Verwaest wrote:
> What about just wrapping the code in a block: `"{"+actual_source+"}"` Let
> and const will stay in the block while var will float out to the global
> scope.
>
> On Tue, Apr 12, 2022 at 1:48 AM Robbie McElrath <rmce...@chromium.org>
> wrote:
>
>> Hello!
>>
>> I'm trying to implement a replacement for the eval call
>> <https://source.chromium.org/chromium/chromium/src/+/main:content/public/test/browser_test_utils.cc;l=1826;drc=7fb345a0da63049b102e1c0bcdc8d7831110e324>
>> in
>> EvalJs that won't be blocked by CSP. To do this, I'm reimplementing the JS
>> wrapper (see the previous link) in C++ and having the ClassicScript run the
>> test-provided JS unmodified without an eval.
>>
>> This mostly works, but the scoping behavior is different than eval's,
>> which is causing issues. I want vars to be defined in the global scope, but
>> let/const to be scoped to the JS being executed. I tried creating a new
>> Context that shared a global object with the existing one (my understanding
>> is that scopes map to Contexts), but Chrome was unhappy about defining a
>> new Context for the main world, and I'm not sure that would make vars
>> behave correctly.
>>
>> Is there a way to get the scoping behavior I want, or a better approach
>> to work around CSP?
>>
>>
>> Thanks!
>> Robbie
>>
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