Unified RTEL (Read-Transform-Evaluate Loop) for JavaScript modules.

What is RTEL (Read-Transform-Eval Loop)? Why this name?

While you may heard of REPL (Read-Eval-Print Loop), however, in environments where JavaScript actually runs, before the Eval step, there would always be a Transformation step where tools like esbuild or CDN based esm.sh involves in between, and print yet doesn't actually mean what they used to mean (output to console or stdout), instead, frontend vDOM based modules like Vue SFC and JSX/TSX, they will mount to a specific DOM node for rendering.

In summary:

• Read (takes input)
• Transform (build, transform, transpile with esbuild, rolldown, swc)
• Evaluate (evaluate the transformed code / module in runtime, on the fly)

Which is the RTEL loop.

Therefore we somehow created a new name for this kind of process in more idiomatical way which capable of expressing the meaning in much obvious way, RTEL.

pnpm i

pnpm -F @unrteljs/playground dev

nr -F @unrteljs/playground dev