A full-screen interactive terminal UI for the DeepSeek Harness agent runtime — live streaming, reasoning blocks, tool cards, sessions, permissions, plan mode, and a full slash-command suite. The web UI, reimagined for the terminal.

Fast (and loose) selective `process.env` replacer using js-tokens instead of an AST

Pass two numbers, get a regex-compatible source string for matching ranges. Validated against more than 2.78 million test assertions.

process.nextTick but always with args

Turn any collection of objects into its own efficient tree or linked list using Symbol

Create a stream that emits events from multiple other streams

YAML 1.2 parser and serializer

Use node's fs.realpath, but fall back to the JS implementation if the native one fails

[](https://travis-ci.org/stefanpenner/get-caller-file) [](https://ci.a

ES2015 `Object.assign()` ponyfill

extend like a boss

Merge multiple streams into one stream in sequence or parallel.

Escape string for use in HTML

An Object.keys replacement, in case Object.keys is not available. From https://github.com/es-shims/es5-shim

Constant-time comparison of Buffers

Returns true if a number or string value is a finite number. Useful for regex matches, parsing, user input, etc.

return list of CallSite objects from a captured stacktrace

Normalize slashes in a file path to be posix/unix-like forward slashes. Also condenses repeat slashes to a single slash and removes and trailing slashes, unless disabled.

A stream that emits multiple other streams one after another.

An implementation of WHATWG AbortController interface.