What is the file extension for the Hack programming language?

Question

Does anyone know the file extension for Hack? I've looked pretty much everywhere, and can't seem to find it. Thanks

The accepted answer was the first result on google. William Lee.. — Sam Orozco, Sep 29 '16 at 19:01
@SamOrozco Do realise that the accepted answer says "I think". The Wikipedia article did not explicitly say that the extension is `.php`. — William Lee, Sep 29 '16 at 19:05

score 2 · Answer 1 · answered Mar 16 '19 at 23:32

HHVM supports 4 file extension for hack .hh, .hck and .hack.

starting from hhvm 4, hack now uses the .hack file extension by default which doesn't require the <?hh opening tag.

We now recommend using the .hack file extension if your editor/IDE support it; files with this extension are always strict, and do not require or allow a <?hh header line.

For example, this is a complete .hack file:
#!/usr/bin/env hhvm
<<__EntryPoint>>
function main(): noreturn {
 print("Hello, world!\n");
 exit(0);
}

example.hh / example.hck / example.php :

<?hh // strict

<<__EntryPoint>>
async function main(): Awaitable<void> {
  print 'hello, world';
}

example.hack :

<<__EntryPoint>>
async function main(): Awaitable<void> {
  print 'hello, world';
}

score 0 · Answer 2 · answered Sep 28 '16 at 19:42

0

I have read something about it in wikipedia: https://en.wikipedia.org/wiki/Hack_(programming_language)

and I think that you can use .php because it should be similar to php. Hope it will help you :)

answered Sep 28 '16 at 19:42

0ndre_

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score 0 · Accepted Answer · answered Oct 25 '16 at 19:58

0

The vim plugin for hack uses the extension .hh for hack files

vim-hack github

answered Oct 25 '16 at 19:58

alexriedl

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chefjuanpi · Answer 4 · 2020-12-08T05:57:08.080

-1

Hack was created by Facebook as a dialect of PHP. They use .php files for their projects write in hack.

** -- UPDATE 2020 -- ** Today on their hite Hack recomendo use .hack as extension https://docs.hhvm.com/hack/getting-started/tools

vscode Hack languae extension continue to use .php as extension on their examples https://marketplace.visualstudio.com/items?itemName=pranayagarwal.vscode-hack

edited Dec 08 '20 at 05:57

answered Oct 11 '17 at 14:45

chefjuanpi

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What is the file extension for the Hack programming language?

4 Answers4