Doesn't work with @std/esm

[laggingreflex]

Trying to use @std/esm

I've put --require @std/esm as a command line option (or in mocha.opts)

I've also put "@std/esm": { "esm": "all" } in package.json

It's still not able to load files with es6 module import/export syntax.

Possibly caused by standard-things/esm#86 standard-things/esm#77

[laggingreflex]

Works with @std/esm version 0.3.0 - 0.5.1. See standard-things/esm#28 (comment)