# node:fs # `node:fs` ## Import ```js import fs from "nstdlib/fs"; ``` > [!NOTE] > Its behavior matches Node.js. Details: over a `node:vfs` memory mount. Paths outside a mount still throw. ## Runtime support | Where it runs | Status | Export coverage | Details | | ------------- | ------ | --------------- | ------- | | **nstd** | ✅ works | – | Native tests match Node.js: fs, fs-watch. | | **Browser** | ❔ not tested | 100% of Node.js | It imports with the small process shim. 102/102 Node.js exports are available. No module-specific behavior test ran. | | **Node.js (host)** | ✅ works | 100% of Node.js | 104/104 exports. | ## Exports (104 of 104) Each cell shows what happens when code reads an export: - ✅ Available through every import style. A named error also counts. - ⚠️ Available through only some import styles. - ❔ The export exists but has no value. - ❌ The export does not exist. - – This environment was not measured.

Show all 104 exports

| Export | Node.js | nstdlib | browser | | ------ | ------- | ------- | ------- | | `Dir` | ✅ | ✅ | ✅ | | `Dirent` | ✅ | ✅ | ✅ | | `FileReadStream` | ✅ | ✅ | ✅ | | `FileWriteStream` | ✅ | ✅ | ✅ | | `ReadStream` | ✅ | ✅ | ✅ | | `Stats` | ✅ | ✅ | ✅ | | `Utf8Stream` | ✅ | ✅ | ✅ | | `WriteStream` | ✅ | ✅ | ✅ | | `_toUnixTimestamp` | ✅ | ✅ | ✅ | | `access` | ✅ | ✅ | ✅ | | `accessSync` | ✅ | ✅ | ✅ | | `appendFile` | ✅ | ✅ | ✅ | | `appendFileSync` | ✅ | ✅ | ✅ | | `chmod` | ✅ | ✅ | ✅ | | `chmodSync` | ✅ | ✅ | ✅ | | `chown` | ✅ | ✅ | ✅ | | `chownSync` | ✅ | ✅ | ✅ | | `close` | ✅ | ✅ | ✅ | | `closeSync` | ✅ | ✅ | ✅ | | `constants` | ✅ | ✅ | ✅ | | `copyFile` | ✅ | ✅ | ✅ | | `copyFileSync` | ✅ | ✅ | ✅ | | `cp` | ✅ | ✅ | ✅ | | `cpSync` | ✅ | ✅ | ✅ | | `createReadStream` | ✅ | ✅ | ✅ | | `createWriteStream` | ✅ | ✅ | ✅ | | `exists` | ✅ | ✅ | ✅ | | `existsSync` | ✅ | ✅ | ✅ | | `fchmod` | ✅ | ✅ | ✅ | | `fchmodSync` | ✅ | ✅ | ✅ | | `fchown` | ✅ | ✅ | ✅ | | `fchownSync` | ✅ | ✅ | ✅ | | `fdatasync` | ✅ | ✅ | ✅ | | `fdatasyncSync` | ✅ | ✅ | ✅ | | `fstat` | ✅ | ✅ | ✅ | | `fstatSync` | ✅ | ✅ | ✅ | | `fsync` | ✅ | ✅ | ✅ | | `fsyncSync` | ✅ | ✅ | ✅ | | `ftruncate` | ✅ | ✅ | ✅ | | `ftruncateSync` | ✅ | ✅ | ✅ | | `futimes` | ✅ | ✅ | ✅ | | `futimesSync` | ✅ | ✅ | ✅ | | `glob` | ✅ | ✅ | ✅ | | `globSync` | ✅ | ✅ | ✅ | | `lchmod` | ❔ | ❔ | ❌ | | `lchmodSync` | ❔ | ❔ | ❌ | | `lchown` | ✅ | ✅ | ✅ | | `lchownSync` | ✅ | ✅ | ✅ | | `link` | ✅ | ✅ | ✅ | | `linkSync` | ✅ | ✅ | ✅ | | `lstat` | ✅ | ✅ | ✅ | | `lstatSync` | ✅ | ✅ | ✅ | | `lutimes` | ✅ | ✅ | ✅ | | `lutimesSync` | ✅ | ✅ | ✅ | | `mkdir` | ✅ | ✅ | ✅ | | `mkdirSync` | ✅ | ✅ | ✅ | | `mkdtemp` | ✅ | ✅ | ✅ | | `mkdtempDisposableSync` | ✅ | ✅ | ✅ | | `mkdtempSync` | ✅ | ✅ | ✅ | | `open` | ✅ | ✅ | ✅ | | `openAsBlob` | ✅ | ✅ | ✅ | | `openSync` | ✅ | ✅ | ✅ | | `opendir` | ✅ | ✅ | ✅ | | `opendirSync` | ✅ | ✅ | ✅ | | `promises` | ✅ | ✅ | ✅ | | `read` | ✅ | ✅ | ✅ | | `readFile` | ✅ | ✅ | ✅ | | `readFileSync` | ✅ | ✅ | ✅ | | `readSync` | ✅ | ✅ | ✅ | | `readdir` | ✅ | ✅ | ✅ | | `readdirSync` | ✅ | ✅ | ✅ | | `readlink` | ✅ | ✅ | ✅ | | `readlinkSync` | ✅ | ✅ | ✅ | | `readv` | ✅ | ✅ | ✅ | | `readvSync` | ✅ | ✅ | ✅ | | `realpath` | ✅ | ✅ | ✅ | | `realpathSync` | ✅ | ✅ | ✅ | | `rename` | ✅ | ✅ | ✅ | | `renameSync` | ✅ | ✅ | ✅ | | `rm` | ✅ | ✅ | ✅ | | `rmSync` | ✅ | ✅ | ✅ | | `rmdir` | ✅ | ✅ | ✅ | | `rmdirSync` | ✅ | ✅ | ✅ | | `stat` | ✅ | ✅ | ✅ | | `statSync` | ✅ | ✅ | ✅ | | `statfs` | ✅ | ✅ | ✅ | | `statfsSync` | ✅ | ✅ | ✅ | | `symlink` | ✅ | ✅ | ✅ | | `symlinkSync` | ✅ | ✅ | ✅ | | `truncate` | ✅ | ✅ | ✅ | | `truncateSync` | ✅ | ✅ | ✅ | | `unlink` | ✅ | ✅ | ✅ | | `unlinkSync` | ✅ | ✅ | ✅ | | `unwatchFile` | ✅ | ✅ | ✅ | | `utimes` | ✅ | ✅ | ✅ | | `utimesSync` | ✅ | ✅ | ✅ | | `watch` | ✅ | ✅ | ✅ | | `watchFile` | ✅ | ✅ | ✅ | | `write` | ✅ | ✅ | ✅ | | `writeFile` | ✅ | ✅ | ✅ | | `writeFileSync` | ✅ | ✅ | ✅ | | `writeSync` | ✅ | ✅ | ✅ | | `writev` | ✅ | ✅ | ✅ | | `writevSync` | ✅ | ✅ | ✅ |