add assert function, assert import.meta.resolve returns string or null

[iambumblehead]

closes #234

[koshic]

Nice hotfix, thank you!

In general it would be nice to detect --experimental-import-meta-resolve flag once instead of asserting return value (and using expensive throw -> catch mechanics) on every 'resolve' call.

[iambumblehead]

@koshic locally, the assertion resolves most tests here that do not use the --experimental flag. Possibly import.meta.resolve is broken with and without the --experimental flag and, if import.meta.resolve is fixed upstream, esmock could remove the assertion and error.

I'm first trying to resolve tests without --experimental and, when those are passing, try to resolve issues that occur when --experimental is used.

[koshic]

Sure, this is why I approved that PR :)

[iambumblehead]

In general it would be nice to detect --experimental-import-meta-resolve flag once instead of asserting return value (and using expensive throw -> catch mechanics) on every 'resolve' call.

yes you are right

[iambumblehead]

Sure, this is why I approved that PR :)

My mental powers are not strong today and I misunderstood several things but am reading more carefully. Thanks for your patience.

[iambumblehead]

closing this in favor of #237