Is it possible to lock things down to string constants?

[mikewest]

It would be lovely if we could have a CreateFromConstant method that would allow

Whatever.createFromConstant("https://example.com/")

but deny

var notAConstant("https://example.com/");
Whatever.createFromConstant(notAConstant);

[mikesamuel]

How can this be done without static analysis?

We've done reasonably reliable checks in other languages by defining an isProbablyInConstantPool predicate, but I don't know of one for JavaScript and we'd need one that's scoped to origin, realm, or narrower.

[mikesamuel]

Since Mike didn't mention this explicitly: https://github.com/mikewest/tc39-proposal-literals

[koto]

Shelving this approach for now. It's proven quite difficult to change the language.