UnhandledPromiseRejectionWarning: Error: The bundler properties/sub-properties (mainBundle / entryAsset) seems to be not present

[AnandaDwiprayoga]

My Code working fine before, after added this plugin in parcel bundler giving this error

√  Built in 29.18s.
(node:2992) UnhandledPromiseRejectionWarning: Error: The bundler properties/sub-properties (mainBundle / entryAsset) seems to be not present
    at Bundler.<anonymous> (D:\rpkct\rpk\PWA\submission2\project\node_modules\parcel-plugin-sw-precache\index.js:36:13)
    at Bundler.emit (events.js:310:20)
    at Bundler.bundle (D:\rpkct\rpk\PWA\submission2\project\node_modules\parcel-bundler\src\Bundler.js:340:12)
    at processTicksAndRejections (internal/process/task_queues.js:97:5)
(node:2992) UnhandledPromiseRejectionWarning: Unhandled promise rejection. This error originated either by throwing inside of an async function without a catch block, or by rejecting a promise which was not handled with .catch(). To terminate the node process on unhandled promise rejection, use the CLI flag `--unhandled-rejections=strict` (see https://nodejs.org/api/cli.html#cli_unhandled_rejections_mode). (rejection id: 1)
(node:2992) [DEP0018] DeprecationWarning: Unhandled promise rejections are deprecated. In the future, promise rejections that are not handled will terminate the Node.js process with a non-zero exit code.

I think this error come from unhandled promise rejection, but i have been added .catch in my code. here data-source.js

const BASE_URL = "https://api.football-data.org";

  class DataSource {
    static getStanding(type) {
        return fetch(BASE_URL + "/v2/competitions/2001/standings?standingType=" + type, {
            method: "GET",
            headers: {
                "X-Auth-Token": "xxxxxx"
            }
        })
        .then(response => response.json())
        .then(responseJson => {
            if (responseJson.standings) {
                return Promise.resolve(responseJson.standings);
            } else {
                return Promise.reject("standing" + type + "is empty");
            }
        })
        .catch(error => {
            alert(error);
        })
    }
}

  export default DataSource;

[cyyyu]

which parcel version are you using? you occurs this error because the plugin is not able to get the package.json file in ur project

[AnandaDwiprayoga]

so how to handle this ?

[cyyyu]

So which version you are on? Could you show me a minimal repo to reproduce it?

[AnandaDwiprayoga]

this is the version of my parcel. and i'm using latest parcel-plugin-sw-precache

[remy]

Same - I installed it on this repo: https://github.com/remy/zx-tools/ - then ran npm run build (and running the same version of parcel as @AnandaDwiprayoga).

[cyyyu]

@remy i get the cause of this. it happens when you try to build multiple entries at the same time. in this case parcel triggers the plugin with bundler.mainBundle.entryAsset is null which i didn't consider it to be before.