🎉 Asynchronous Iteration arrived at Stage 4.

https://github.com/tc39/proposals/commit/a41dccc91675f41c65dee354c18c19946d6f2f45

• Update Espree to support the syntax in ecmaVersion:2018.
  • for await (const x of xs); (ForOfStatement#await)
  • async function* f() {}
  • f = async function* () {}
  • obj = { async* f() {} }
  • class A { async* f() {} }
• Update core rules to support the syntax.

[not-an-aardvark]

• object-shorthand fixer needs to account for async generator methods
• semi needs to account for for-await-of statements
• keyword-spacing needs to account for for-await-of statements
• no-await-in-loop needs to account for for-await-of statements (should not report statements in for-await-of loops)
• no-useless-computed-key fixer needs to account for async generator methods
• require-await needs to avoid reporting errors if an async function has a for-await-of loop

[mysticatea]

I’m working on this.