enhancementgood first issue
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説明
"Babel 7.8.0 supports the new ECMAScript 2020 features by default: you don't need to enable individual plugins for nullish coalescing (??), optional chaining (?.) and dynamic import() anymore with preset-env." - https://babeljs.io/blog/2020/01/11/7.8.0
We should update zero to latest babel and add an integration test for these features. I think the right change will be here.