@warlock.js/fs

A pocket-sized filesystem toolkit for Node — the shape you wish node:fs/promises had, without pulling in fs-extra, rimraf, mkdirp, write-file-atomic, and hasha. Standalone: usable in any Node project, no @warlock.js/core required.

Every helper picks the right defaults — writes create parent directories for you, deletes swallow ENOENT, atomicWriteAsync writes-then-renames, and hashFileAsync streams so a 1 GB file doesn't blow the heap.

Install

yarn add @warlock.js/fs
# or
npm install @warlock.js/fs

One naming convention

That's the whole vocabulary:

*Async returns a Promise — use it in server / runtime code.
bare name is synchronous — use it in CLI tools, codegen, and one-shot scripts.

One canonical name per operation; no aliases to remember. If the obvious name isn't there, the operation isn't there.

30-second tour

import {
  putJsonFileAsync,
  getJsonFileAsync,
  atomicWriteAsync,
  ensureDirectoryAsync,
  listFilesAsync,
  hashFileAsync,
} from "@warlock.js/fs";

// Write JSON (parent dirs auto-created, pretty-printed at 2 spaces)
await putJsonFileAsync("./build/manifest.json", { version: "1.0.0" });

// Read it back, typed
const manifest = await getJsonFileAsync<{ version: string }>("./build/manifest.json");

// Atomic write — concurrent readers never see a half-written file
await atomicWriteAsync("./build/state.lock", manifest.version);

// Directory ops
await ensureDirectoryAsync("./build/cache");
const files = await listFilesAsync("./build"); // full paths, not bare names

// Content fingerprint (streaming — constant memory)
const digest = await hashFileAsync("./build/manifest.json");

What you get

Read + write text and JSON — getFileAsync, getJsonFileAsync, putFileAsync, putJsonFileAsync. Writes auto-create parent directories; JSON variants pretty-print at 2-space indent.
Atomic writes — atomicWriteAsync (accepts string | Buffer) and atomicWriteJsonAsync, for files other processes read concurrently.
Directory management — ensureDirectoryAsync, list(Async) / listFiles(Async) / listDirectories(Async), copyFile(Async) / copyDirectory(Async), renameFile(Async).
Delete — unlink(Async) and removeDirectory(Async), both ENOENT-safe (no-op on missing targets).
Content hashing — hashFileAsync (streaming), hashFileSmallAsync, hashString, hashBuffer. SHA-256 default; sha1 / md5 / sha512 supported.
Existence + stats — pathExists, fileExists, directoryExists, lastModified, stats (each with an *Async twin).

Full documentation

The complete guide — getting started, essentials, task guides, recipes, and API reference — lives at warlock.js.org.

Tests

This package uses Vitest:

yarn test

License

MIT