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Pete Bacon Darwin
7f2330a968
When profiling ngcc it is notable that a large amount of time is spent dealing with an exception that is thrown (and handled internally by fs) when checking the existence of a file. We check file existence a lot in both finding entry-points and when TS is compiling code. This commit adds a simple cached `FileSystem`, which wraps a real `FileSystem` delegate. This will reduce the number of calls through to `fs.exists()` and `fs.readFile()` on the delegate. Initial benchmarks indicate that the cache is miss to hit ratio for `exists()` is about 2:1, which means that we save about 1/3 of the calls to `fs.existsSync()`. Note that this implements a "non-expiring" cache, so it is not suitable for a long lived `FileSystem`, where files may be modified externally. The cache will be updated if a file is changed or moved via calls to `FileSystem` methods but it will not be aware of changes to the files system from outside the `FileSystem` service. For ngcc we must create a new `FileSystem` service for each run of `mainNgcc` and ensure that all file operations (including TS compilation) use the `FileSystem` service. This ensures that it is very unlikely that a file will change externally during `mainNgcc` processing. PR Close #30525
81 lines
3.0 KiB
JavaScript
81 lines
3.0 KiB
JavaScript
#!/usr/bin/env node
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/**
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* @license
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* Copyright Google Inc. 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 * as yargs from 'yargs';
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import {resolve, setFileSystem, CachedFileSystem, NodeJSFileSystem} from '../src/ngtsc/file_system';
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import {mainNgcc} from './src/main';
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import {ConsoleLogger, LogLevel} from './src/logging/console_logger';
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// CLI entry point
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if (require.main === module) {
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const args = process.argv.slice(2);
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const options =
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yargs
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.option('s', {
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alias: 'source',
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describe:
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'A path (relative to the working directory) of the `node_modules` folder to process.',
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default: './node_modules'
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})
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.option('f', {alias: 'formats', hidden: true, array: true})
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.option('p', {
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alias: 'properties',
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array: true,
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describe:
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'An array of names of properties in package.json to compile (e.g. `module` or `es2015`)\n' +
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'Each of these properties should hold the path to a bundle-format.\n' +
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'If provided, only the specified properties are considered for processing.\n' +
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'If not provided, all the supported format properties (e.g. fesm2015, fesm5, es2015, esm2015, esm5, main, module) in the package.json are considered.'
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})
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.option('t', {
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alias: 'target',
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describe:
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'A relative path (from the `source` path) to a single entry-point to process (plus its dependencies).',
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})
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.option('first-only', {
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describe:
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'If specified then only the first matching package.json property will be compiled.',
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type: 'boolean'
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})
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.option('l', {
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alias: 'loglevel',
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describe: 'The lowest severity logging message that should be output.',
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choices: ['debug', 'info', 'warn', 'error'],
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})
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.help()
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.parse(args);
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if (options['f'] && options['f'].length) {
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console.error(
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'The formats option (-f/--formats) has been removed. Consider the properties option (-p/--properties) instead.');
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process.exit(1);
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}
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setFileSystem(new CachedFileSystem(new NodeJSFileSystem()));
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const baseSourcePath = resolve(options['s'] || './node_modules');
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const propertiesToConsider: string[] = options['p'];
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const targetEntryPointPath = options['t'] ? options['t'] : undefined;
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const compileAllFormats = !options['first-only'];
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const logLevel = options['l'] as keyof typeof LogLevel | undefined;
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try {
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mainNgcc({
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basePath: baseSourcePath,
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propertiesToConsider,
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targetEntryPointPath,
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compileAllFormats,
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logger: logLevel && new ConsoleLogger(LogLevel[logLevel]),
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});
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process.exitCode = 0;
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} catch (e) {
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console.error(e.stack || e.message);
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process.exitCode = 1;
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}
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}
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