Async do expressions

Async do expressions can replace async IIFEs called in a synchronous scope.

Type	TC39	CoreJS	Babel	Civet	JS+
Syntax	✅ Stage 0 View		✅ View	✅ View	✅ via Babel

JS+ TypeScript

import { readFile } from 'node:fs';

async do {
  const file = await readFile('file.txt', 'utf8');

  console.log(file);
}

import { readFile } from 'node:fs';

(async () => {
  const file = await readFile('file.txt', 'utf8');

  console.log(file);
})();