569369f927Add mount/unmount lifecycle on `VirtualFileSystem`, a handler registry that fs.js and fs/promises.js consult via `vfsState.handlers`, and a router that maps absolute paths to the VFS that owns them. When a VFS is mounted, the public `fs.*` and `fs/promises` APIs (including streams, `fs.watch`, and `opendir`) dispatch to the provider for paths under the mount point, and fall through to the real filesystem otherwise. Includes per-method dispatch tests, error-path coverage, multi-mount routing tests, and router unit tests. Ref: https://github.com/nodejs/node/pull/63115 Signed-off-by: Matteo Collina <hello@matteocollina.com> PR-URL: https://github.com/nodejs/node/pull/63537 Refs: https://github.com/nodejs/node/pull/63115 Reviewed-By: James M Snell <jasnell@gmail.com> Reviewed-By: Paolo Insogna <paolo@cowtech.it>
29 lines
826 B
JavaScript
29 lines
826 B
JavaScript
// Flags: --experimental-vfs
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'use strict';
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// fs.writeFileSync and fs.appendFileSync dispatch to VFS.
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require('../common');
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const assert = require('assert');
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const fs = require('fs');
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const path = require('path');
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const vfs = require('node:vfs');
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const mountPoint = path.resolve('/tmp/vfs-writeFileSync-' + process.pid);
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const myVfs = vfs.create();
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myVfs.mkdirSync('/src', { recursive: true });
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myVfs.mount(mountPoint);
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const target = path.join(mountPoint, 'src/new.txt');
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fs.writeFileSync(target, 'fresh');
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assert.strictEqual(fs.readFileSync(target, 'utf8'), 'fresh');
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fs.appendFileSync(target, ' more');
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assert.strictEqual(fs.readFileSync(target, 'utf8'), 'fresh more');
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// Buffer input
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fs.writeFileSync(target, Buffer.from('binary'));
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assert.strictEqual(fs.readFileSync(target, 'utf8'), 'binary');
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myVfs.unmount();
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