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Denoでshebangを使って実行する

Last updated at Posted at 2020-11-26

JavaScrptでもTypeScriptでも、
#!/usr/bin/env -S deno runでOK!

hello.js
#!/usr/bin/env -S deno run
console.log('hello deno!');
hello.ts
#!/usr/bin/env -S deno run
const message: string = 'hello deno!'
console.log(message);

deno runで実行する仕様なので、
#!/usr/bin/env nodeと同じ感覚で
#!/usr/bin/env denoと書いてもダメなんですねー。

error: Found argument './hello.js' which wasn't expected, or isn't valid in this context

USAGE:
    deno [OPTIONS] [SUBCOMMAND]

For more information try --help

#!/usr/bin/env deno runでも叱られます。
シェバンにオプションを渡すときは-Sが必要。

/usr/bin/env: ‘deno run’: No such file or directory
/usr/bin/env: use -[v]S to pass options in shebang lines

参考
https://stackoverflow.com/questions/63043929/how-do-i-invoke-deno-from-a-shell-script

追記)拡張子について

僕はシェバン付けてコマンドとして実行する場合も、ファイルの拡張子は付ける派なのですが、
拡張子を省略した場合は、DenoではJavaScriptと見なされるようです。
現状、TypeScriptと認識させたい場合は、.ts拡張子はしっかり付けるのが安全です。

TypeScriptでも拡張子を省略したいという需要はあるようで、ここで議論されています。
https://github.com/denoland/deno/issues/5088

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