angular/packages/zone.js/lib/node/fs.ts

/**
 * @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 {patchMacroTask, zoneSymbol} from '../common/utils';
import {ZoneType} from '../zone-impl';

export function patchFs(Zone: ZoneType): void {
  Zone.__load_patch('fs', (global: any, Zone: ZoneType, api: _ZonePrivate) => {
    let fs: any;
    try {
      fs = require('fs');
    } catch (err) {
    }

    if (!fs) return;

    // watch, watchFile, unwatchFile has been patched
    // because EventEmitter has been patched
    const TO_PATCH_MACROTASK_METHODS = [
      'access',  'appendFile', 'chmod',    'chown',    'close',     'exists',    'fchmod',
      'fchown',  'fdatasync',  'fstat',    'fsync',    'ftruncate', 'futimes',   'lchmod',
      'lchown',  'link',       'lstat',    'mkdir',    'mkdtemp',   'open',      'read',
      'readdir', 'readFile',   'readlink', 'realpath', 'rename',    'rmdir',     'stat',
      'symlink', 'truncate',   'unlink',   'utimes',   'write',     'writeFile',
    ];

    TO_PATCH_MACROTASK_METHODS.filter(name => !!fs[name] && typeof fs[name] === 'function')
        .forEach(name => {
          patchMacroTask(fs, name, (self: any, args: any[]) => {
            return {
              name: 'fs.' + name,
              args: args,
              cbIdx: args.length > 0 ? args.length - 1 : -1,
              target: self
            };
          });
        });

    const realpathOriginalDelegate = fs.realpath?.[api.symbol('OriginalDelegate')];
    // This is the only specific method that should be additionally patched because the previous
    // `patchMacroTask` has overridden the `realpath` function and its `native` property.
    if (realpathOriginalDelegate?.native) {
      fs.realpath.native = realpathOriginalDelegate.native;
      patchMacroTask(fs.realpath, 'native', (self, args) => ({
                                              args,
                                              target: self,
                                              cbIdx: args.length > 0 ? args.length - 1 : -1,
                                              name: 'fs.realpath.native',
                                            }));
    }
  });
}