angular-cn/dev-infra/release/build/index.ts

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/**
* @license
* Copyright Google LLC All Rights Reserved.
*
* Use of this source code is governed by an MIT-style license that can be
* found in the LICENSE file at https://angular.io/license
*/
import {fork} from 'child_process';
import {BuiltPackage} from '../config/index';
/**
* Builds the release output without polluting the process stdout. Build scripts commonly
* print messages to stderr or stdout. This is fine in most cases, but sometimes other tooling
* reserves stdout for data transfer (e.g. when `ng release build --json` is invoked). To not
* pollute the stdout in such cases, we launch a child process for building the release packages
* and redirect all stdout output to the stderr channel (which can be read in the terminal).
*/
export async function buildReleaseOutput(): Promise<BuiltPackage[]|null> {
return new Promise(resolve => {
const buildProcess = fork(require.resolve('./build-worker'), [], {
// The stdio option is set to redirect any "stdout" output directly to the "stderr" file
// descriptor. An additional "ipc" file descriptor is created to support communication with
// the build process. https://nodejs.org/api/child_process.html#child_process_options_stdio.
stdio: ['inherit', 2, 2, 'ipc'],
});
let builtPackages: BuiltPackage[]|null = null;
// The child process will pass the `buildPackages()` output through the
// IPC channel. We keep track of it so that we can use it as resolve value.
buildProcess.on('message', buildResponse => builtPackages = buildResponse);
// On child process exit, resolve the promise with the received output.
buildProcess.on('exit', () => resolve(builtPackages));
});
}