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Fourth Ally

Build faster with sharp, minimal utilities.

Tools for engineers.

Our belief

Next-gen JS/TS toolchains should stay coherent.

Principles

Unified pipeline

One AST, resolver, and interop story for lint, test, build, and ship so semantics stay aligned and parsing happens once.

Native-speed core

Foundational pieces are built in compile-to-native stacks to unlock heavier optimizations without slowing the editor loop.

Composable pieces

Every capability arrives as a small building block you can wire together or swap independently as needs change.

Runtime neutral

Core logic avoids binding to a single JS runtime so browser, server, and edge all benefit from the same pipeline.

What is next

We are exploring what to build next, with you.

Listening mode

Built with you

Future tools ship from real-world pain points gathered from users and the community.

Interop first

Whatever comes next will play nicely with modern stacks, bundlers, and runtimes.

Stable cores

We favor lean, well-tested primitives so you can assemble your own stack.