Hi Ben,
I checked out Module API on v8 6.7 and it was working great, except one
problem: I lost a way to bind external variables to the global object used
for module evaluation. I have tried setting them on the global object of
the context, the module namespace object (return value of
Module::GetModuleNamespace()), and the global object template for context
creation, but nothing worked. I know that there's syntax for a module to
import external variables. But for backward compatibility, I'd like to be
able to set some global variables for module evaluation. Is there anyway
to do that?
Thanks a lot!
On Saturday, May 12, 2018 at 4:38:15 AM UTC-7, Ben Noordhuis wrote:
>
> On Sat, May 12, 2018 at 6:42 AM, Jane Chen <jxch...@gmail.com
> <javascript:>> wrote:
> > Thanks Ben.
> >
> > I want to re-use my context for performance reasons, but some JavaScript
> > programs have constant global variables that cannot be re-defined, such
> as
> > those declared with let or const. To work around this, I thought I
> could
> > just evaluate each program in a closure by artificially enclosing the
> script
> > with {}. Do you see any issue with doing it?
>
> I don't see anything wrong with that but if you reuse the context, you
> have to scrub globals introduced with `var`, undo any monkey-patching
> of builtins, figure out how to cancel pending promises, etc. Using a
> new context is probably a lot simpler and robuster.
>
> > Is there any better way to do so?
>
> You could compile your code as an es6 module or with
> v8::ScriptCompiler::CompileFunctionInContext() but you'd probably have
> to upgrade first. Modules don't exist in V8 5.3 and
> CompileFunctionInContext() has a bug where the line and column in
> stack traces are wrong.
>
> Modules and functions have different run-time semantics than a
> top-level script, of course, so they might not be a good fit if
> backwards compatibility is a concern.
>
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