* Error on missing BigInt in ES2020 too.
Previously it was only on ESNext, but bigint ships in ES 2020.
There are no tests for this; passing `false` doesn't cause any tests to
fail at least.
* add tests
* init export start as decl
* fix some broken
* fix more case
* fix more and more case
* make it work
* make lint happy and accept baseline
* add more tests
* fix system module
* add more case
* delete useless assert
* accept baseline
* make lint happy
* fix missing utils
* update api
* make lint happy
* add missing semi
* fix minor issue
* fix locally bound
* avoid useless check
* update public api
* add more case
* fix some case
* Use multi-module selection in test runner to cut down on duplication.
* Accepted baselines.
* remove superfluous tests.
* Remove baseline.
* Downlevel `export * as ns` in es2015.
* Accepted baselines.
* Update names of things.
Co-authored-by: Daniel Rosenwasser <DanielRosenwasser@users.noreply.github.com>
