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