Bun shell set -x or How to echo bun shell commands as they are executed

[chneau]

Basically this https://stackoverflow.com/questions/2853803/how-to-echo-shell-commands-as-they-are-executed but for bun shell.

Similar I can think of is setting the env var BUN_CONFIG_VERBOSE_FETCH=curl to show fetch as curl. That's a fabulous idea I love and helps a lot for debugging and quick prototyping.

Could we get something similar for Bun shell? Either a $.verbose(true) or a BUN_CONFIG_VERBOSE_SHELL ?

[zvictor]

Current workaround:

#!/usr/bin/env -S bun --no-warnings
import { $ as bun$ } from 'bun'

// Bun’s shell does not currently have a built‑in “trace”/verbose mode like Bash’s set -x, so there is no $.verbose(true) option for now.
// We can create a Proxy around it to log the commands being run.
// @see https://github.com/oven-sh/bun/discussions/13054
const $ = new Proxy(bun$, {
  apply(target, thisArg, args) {
    const [strings, ...values] = args as [TemplateStringsArray, ...unknown[]]

    // Build a readable version of the command.
    // (This is for logging; Bun still does its own escaping/execution.) [web:8]
    const cmd = strings
      .map((s, i) => s + (i < values.length ? String(values[i]) : ''))
      .join('')
      .trim()

    console.error(`\x1b[2m\x1b[90m$ ${cmd}\x1b[0m`)
    return Reflect.apply(target, thisArg, args)
  },
}) as typeof bun$

$`echo "Hello World"`