Expected outputs are not produced when using an async main function in Node

[jen20]

I would expect the following program to produce an output name bucketArn with the value from the resource, however it produces no outputs.

import * as aws from "@pulumi/aws";
import {ComponentResource, ComponentResourceOptions, Output} from "@pulumi/pulumi";

class TestComponent extends ComponentResource {
    private bucket: aws.s3.Bucket;

    public bucketArn(): Output<string> {
        return this.bucket.arn;
    }

    constructor(name: string, args: {}, opts?: ComponentResourceOptions) {
        super("TestComponent", name, {}, opts);

        this.bucket = new aws.s3.Bucket(`${name}-bucket`, {}, {
            parent: this,
        });
    }
}

async function main() {
    const component = new TestComponent("test", {});

    return {
        bucketArn: component.bucketArn(),
    }
}

module.exports = main();

[jen20]

Current versions:

pulumi CLI: v0.17.21
node: v8.14.0

[clstokes]

Occurs with these versions too if helpful:

• pulumi v0.17.21
• node v12.5.0

[lukehoban]

A simple workaround is:

export const bucketArn = main().then(m => m.bucketArn);

It is mostly unintentional that this does not work as written - if your module export is itself a Promise or Output, we should be able to handle that (just like we handle if it is an object with Promise or Output-valued properties).

[CyrusNajmabadi]

Fix available.

[xtellurian]

Thanks for the snippet @lukehoban :) it worked for me

Is there a way to export multiple stack outputs?

[CyrusNajmabadi]

Is there a way to export multiple stack outputs?

Absolutely! Just do this:

const mainResult = main();
export const bucketArn = mainResult then(m => m.bucketArn);
export const whatever = mainResult.then(m => yadda yadda);
export const whatever2 = 1 + 2 + floop;

basically, all your top-level exports become 'stack outputs'. You can have those be outputs, promises, expressions, whatever. :)

[tigran-gruv]

export const bucketArn = mainResult then(m => m.bucketArn);
export const whatever = mainResult.then(m => yadda yadda);

^^^ Is it a guaranteed behavior to export promise and get the resolved value at the end?

[lukehoban]

Is it a guaranteed behavior to export promise and get the resolved value at the end?

Yes - the Pulumi JavaScript SDK will load your entrypoint module, then resolve all Inputs (Outputs or Promises) that were set on the modules exports. This is required and guaranteed behavior.

[fuadsaud]

I was bitten by this issue today and, as far as I understand, the docs seem to indicate that exporting an async function would work. Am I missing something?