wuespace/telestion-client

import { Reporter } from '@parcel/plugin';
import { JsonSerializable } from '@wuespace/telestion-client-types';

/**
 * The reporter sends every Parcel build status update through
 * Node's [IPC channel](https://nodejs.org/dist/latest-v16.x/docs/api/child_process.html#subprocesssendmessage-sendhandle-options-callback)
 * between two Node processes.
 *
 * The following build events are transmitted:
 * - `buildStart`
 * - `buildProgress` (with the build phase)
 * - `buildSuccess` (with the build time and number of bundles)
 * - `buildFailure` (with the failure diagnostics)
 *
 * Every other build event is ignored.
 */
export default new Reporter({
    report({ event, logger }) {
        let message: JsonSerializable | undefined;

        if (event.type === 'buildStart') {
            message = { type: 'buildStart' };
        } else if (event.type === 'buildProgress') {
            message = {
                type: 'buildProgress',
                phase: event.phase
            };
        } else if (event.type === 'buildSuccess') {
            message = {
                type: 'buildSuccess',
                buildTime: event.buildTime,
                numberOfBundles: event.bundleGraph.getBundles().length
            };
        } else if (event.type === 'buildFailure') {
            message = {
                type: 'buildFailure',
                diagnostics: event.diagnostics
            };
        }

        if (!message) return; // unknown event type -> ignore it

        if (!process.send) {
            logger.warn({
                message:
                    "IPC to parent process is not open. Did you run Parcel through Node's fork process?"
            });
            return;
        }

        process.send(message);
    }
});