deno-dex

A dexterous deno executor (only for development)

Commentary article in Japanese: https://zenn.dev/kawarimidoll/articles/d371abbd46b65b

Setup

Install by deno install:

deno install --allow-read --allow-write --allow-run --reload --force --name dex https://pax.deno.dev/kawarimidoll/deno-dex/main.ts

The reasons why these permissions are required are:

• read: to watch file changes and current working directory
• write: to save intermediate script file in $DENO_DIR
• run: to run and kill process

Features

• Run deno run or deno test for the file as argument.
  • Detect the file is for test or not.
  • Add --allow-all --unstable --no-check --watch for fast development.
• There are several options.
  • --clear: Clear console every restart.
  • --watch: Watch changes of any files you specified.
  • Other options are passed to deno run or deno test transparently.
• Auto-detect import maps and configuration files.
  • When dex starts without --import-map option and there is import_map.json, --import-map=import_map.json is implicitly added.
  • When dex starts without --config option and there is one of deno.jsonc, deno.json or tsconfig.json, --config=[one of them] is implicitly added.
  • The arguments of --import-map and --config are also passed to --watch option of dex.

Usage

Run the file by deno run:

dex hello.ts
# -> deno run --allow-all --unstable --no-check --watch hello.ts

Test the file by deno test if the file is test file:

dex hello_test.ts
# -> deno test --allow-all --unstable --no-check --watch hello_test.ts

For more details, see help:

dex --help

Caution

As written above, dex skips all checks (--allow-all --unstable --no-check). This increases productivity in development, but decreases security. Use it only for your own code.

When Deno.exit() is called, process will be stopped without restarting. This is same as normal deno run --watch behavior.

Vim/Neovim command

If you using Vim or Neovim, put the definition below in your configuration file to enable :Dex command.

command! -nargs=* -bang Dex silent only! | botright 12 split |
    \ execute 'terminal' (has('nvim') ? '' : '++curwin') 'dex'
    \   (<bang>0 ? '--clear' : '') <q-args> expand('%:p') |
    \ stopinsert | execute 'normal! G' | set bufhidden=wipe |
    \ execute 'autocmd BufEnter <buffer> if winnr("$") == 1 | quit! | endif' |
    \ wincmd k

• :Dex to run dex with the current file in the terminal window under editor area.
  • :Dex accepts runtime options, like as :Dex --quite
• :Dex! is shorthand of :Dex --clear

Acknowledgements

--watch option is heavily inspired by this article.

Build a live reloader and explore Deno! 🦕 - DEV Community

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