Async function declaration with destructuring object is not supported

[victor-cr]

In the given valid Node.JS example:

const f = async ({a = 1, b = 'bbb'}) => {
  return a + b;
};
f({}).then(console.log);

I get the error

SyntaxError: Invalid shorthand property name initializer in object literal
    at new Script (vm.js:73:7)
    at createScript (vm.js:245:10)
    at Object.runInThisContext (vm.js:297:10)
    at Module._compile (internal/modules/cjs/loader.js:657:28)
    at Object.<anonymous> (internal/modules/cjs/loader.js:700:10)
    at Module.load (internal/modules/cjs/loader.js:599:32)
    at tryModuleLoad (internal/modules/cjs/loader.js:538:12)
    at Function._load (internal/modules/cjs/loader.js:530:3)
    at Function.runMain (internal/modules/cjs/loader.js:742:12)
    at startup (internal/bootstrap/node.js:295:19)

While vanila Node.JS v10.14.2 returns 1bbb
Also, if I remove either async or default values of the destructuring object - it works in Graal like a charm.
I am using GraalVM CE 1.0.0-rc10

[iamstolis]

Thank you for reporting this issue. It looks like a bug in our parsing of async arrow functions. Note that we seem to parse

const f = async function ({a = 1, b = 'bbb'}) {
  return a + b;
};

correctly, i.e., you can rewrite the code to avoid async arrow functions as a workaround (until we fix the issue).

[victor-cr]

Unfortunately for me, I found that in 3rd party library and just extracted the minimal example from it.

[iamstolis]

Unfortunately for me, I found that in 3rd party library ...

I was afraid that this will be the case. Is that library/npm module public? If so, which one is it? I hope to have a fix soon and I would like to verify it against the original code that disclosed this problem, if possible.

[victor-cr]

I have found it in our open source build framework yoshi. E.g. https://github.com/wix/yoshi/blob/master/packages/yoshi/src/tasks/maven-statics/index.js

https://www.npmjs.com/package/yoshi

[woess]

Thanks for the report! @iamstolis has fixed the bug in 8f39670.