@epic-web/app-launcher/build/define-launcher.js

Utility for launching your applications on a per-test basis.

import { AppProcess, kUrl } from './app-process.js';
import { waitForPort } from './wait-for-port.js';
export const kLauncherOptions = Symbol('kLauncherOptions');
export function defineLauncher(options) {
    return {
        [kLauncherOptions]: options,
        async run(runOptions) {
            const context = (await options.context?.()) ?? {};
            const baseEnv = await options.extends?.[kLauncherOptions].env?.({
                context,
            });
            const customEnv = await options.env?.({ context });
            const env = {
                ...(baseEnv || {}),
                ...(customEnv || {}),
            };
            const command = await options.command({ context, env });
            // Spawn the application.
            const app = new AppProcess({
                command,
                env,
                cwd: runOptions?.cwd,
            });
            const childProcess = await app.launch();
            if (options?.debug) {
                childProcess.stdout?.pipe(process.stdout);
                childProcess.stderr?.pipe(process.stderr);
            }
            // Wait for the provided application URL to be up.
            const url = await options.url({
                context,
                env,
                appProcess: childProcess,
            });
            const resolvedUrl = url instanceof URL ? url : new URL(url);
            app[kUrl] = resolvedUrl;
            await waitForPort(+resolvedUrl.port);
            return app;
        },
    };
}
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