An experimental browser editor for Bend.

Bun is the only required build tool. Initialize the pinned Bend compiler and start the local static server:

git submodule update --init --recursive
bun run dev

Open http://localhost:3050, edit the program, press Run, and select the output tab.

bun run build

This creates a self-contained site in dist/. It has no server-side API and uses relative asset URLs, so dist/ can be served from any static host or from a subdirectory such as https://USER.github.io/REPOSITORY/.

The workflow in .github/workflows/pages.yml builds and deploys the site on every push to main. In the repository's Settings → Pages, set Source to GitHub Actions. The workflow checks out the Bend submodule, so no built assets need to be prepared manually.

The editor bundles Bend's TypeScript checker and evaluator into a Web Worker. The upstream compiler is pinned as a Git submodule in vendor/bend and is not modified. build.ts aliases the compiler's small node:* surface to the browser adapters in platform/; platform/fs.ts provides an in-memory virtual filesystem containing base.bend and the current editor source.

Runs use a fresh worker with a five-second timeout. Projects support multiple local .bend files and are saved in local storage. The explorer reads Bend Hub's public package index, previews immutable Hub files, and can insert a content-addressed package import into the entry file. Bend's own loader fetches and cryptographically verifies imported Hub packages inside the worker.

The editor supports mouse and Shift-arrow text selection, Select All, copy, cut, and multiline paste. Command/Ctrl + / toggles Bend # comments on the current line or every selected nonempty line. These also work for read-only Bend Hub previews (copy only). Hover a known name to preview its Bend type. This includes top-level functions, datatypes, constructors, Base names, local imports, and Bend Hub imports. Command/Ctrl-click a name (or press F12 with the cursor on it) to jump to its definition.

Foreign effects, browser IO, package publishing, and JavaScript code generation are not wired up yet.