Dynamic imports

[andrieshiemstra]

see https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/import#Dynamic_Imports

todo:

• test if this works by default in new mozjs with the current hooks,
• see if it works with different hooks,

[andrieshiemstra]

see
https://doc.servo.org/mozjs/jsapi/fn.SetModuleDynamicImportHook.html
https://doc.servo.org/mozjs/jsapi/type.ModuleDynamicImportHook.html

https://github.com/servo/servo/blob/2ce4bc5ad6687ad37bd928709eae1be866b5abc8/components/script/script_module.rs#L1133

[andrieshiemstra]

dyn import gets us err: "Dynamic module import is disabled or not supported in this context"
because we need to set the dynamic import hook

https://searchfox.org/mozilla-central/source/js/src/builtin/ModuleObject.cpp#1755

[andrieshiemstra]

ok, basic code works, next up

• code quality
  • i'm doing a lot uf unnecesarry rooting to get the types i need
  • impl epr.handle()
  • figure out or create util for jsapi::handle -> rust::handle
  • epr for JSString/Value and not just object
  • replace closure with three seperate epr's?`
  • move to modules.rs as much as possible and make the util reusable
• documentation
• test cases
  • cached and uncached
  • unresolvable, see if prom rejects
  • unparsable, see if prom rejects