Async await syntax is broken on Firefox

[sinhgc]

Description

The modern async - await syntax seems broken on Firefox while using a static resource library.
Please note that if I put the same code in to a LWC, it works well, but when I put it into a static resource, it's broken.

Steps to Reproduce

• Create a simple static resource like this

const test = async () => {
    console.log('hello');
};

(async () => {
    await test();
    console.log('This line is unreachable on Firefox');
})();

• From the LWC

import { LightningElement } from 'lwc';
import sampleLib from '@salesforce/resourceUrl/sampleLib'
import {loadScript} from 'lightning/platformResourceLoader'

export default class SampleCode extends LightningElement {
    constructor(){
        super();
        loadScript(this, sampleLib).then(()=> {
            //just do nothing
        })
    }
}

Expected Results

The line of code after the await should be reachable.

Actual Results

The line of code after the await is unreachable on Firefox.

Browsers Affected

Firefox

Version

The latest version - 134.0 (aarch64)

[wjhsf]

Thanks for reporting this issue! It looks like an issue with the resource loader module, not the LWC framework (this repo). To resolve your issue, I would recommend opening a Salesforce Stack Exchange question or a Salesforce case.

[sinhgc]

Thank you @wjhsf
I've created a question here https://salesforce.stackexchange.com/questions/429373/async-await-syntax-is-broken-in-static-resource-on-firefox