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Ask HN: Is it possible to write a JavaScript runtime with "await by default"?

3 points by stanlogin 3y ago

So that this code: ``` let a = await aFuncThatReturnPromise(); console.log(a) ``` becomes the following and does the same thing: ``` let a = aFuncThatReturnPromise(); console.log(a) ``` For sometimes I do not want wait, use: ``` let a = nowait aFuncThatReturnPromise(); ```

deleted 3y ago
[deleted]
aurareturn 3y ago
No, that's not possible. Console.log(a) will always run and finish before your async function finishes in the example that you want.
- stanlogin 3y ago
  I know it. But I'm asking about possibility of creating a new runtime.
  - pestatije 3y ago
    but then console.log(a) is also a promise...you could do this by adding await to all function calls, a kind of parser preprocessor, and then just removing all noawait's
numtel 3y ago
We used to use fibers before promises to do this. But don't do this. https://www.npmjs.com/package/fibers https://www.npmjs.com/package/fibers
petercooper 3y ago
Rather than changing the semantics of JavaScript, which could cause confusion, you'd probably be better off implementing a compile-to-JS language like CoffeeScript and implementing that as the default behavior.