Read and write files atomically and reliably.

A query library for ECMAScript AST using a CSS selector like query language.

Persisted projection cache (ctx.sessionProjectionCache): durable per-session projection checkpoints over the domain data form, throttled write-behind, and the cold-read ladder (cache row + persistence tail replay)

Loro CRDTs is a high-performance CRDT framework that makes your app state synchronized, collaborative and maintainable effortlessly.

Get the last or last n elements in an array.

Lowercase the keys of an object

File-backed settings provider (settings.yaml) for the DeepSeek Harness

Write data to a file, replacing the file if it already exists and creating any intermediate directories if they don't already exist. Thin wrapper around node's native fs methods.

A PassThrough stream that keeps track of last line written

Background job registry (ctx.jobs) for the DeepSeek Harness — shared ids, owner isolation, polling, cancellation, and completion listeners for long-running tool work

Access the system clipboard (copy/paste)

Stringify and write JSON to a file atomically

An iteration of the Node.js core streams with a series of improvements

Session-projection seam: the merge-extensible projection type table, the provider contract, and the ctx.sessionProjections registry serving whole current values of log-derived per-session state

This is a representation of a codecatalyst source repository.

JavaScript replaceLast function - Replaces last match for pattern in string with replacement

Stringify and write YAML to a file atomically

WASM bindings for flock-rs.

Write data to a random temporary file

Read in the last N lines of a file efficiently using node.js and fs.