1. Installation : The HHVM package includes everything you need to work with Hack, including the runtime and typechecker.
See the HHVM installation page to find the package relevant for your platform.
2. Initialize A Project : Create a directory with a
.hhconfig file in it. This will be the root of your project.
$ mkdir my_project
$ cd my_project
$ touch .hhconfig​
3. Write Your First Hack Program : Create a file called
my_project/hello.hack with the following code:
use namespace HH\Lib\IO;
<<__EntryPoint>>
async function main(): Awaitable<void> {
await IO\request_output()->writeAllAsync("Hello World!\n");
}​
4. Run The Typechecker : Normally you'll get type errors and hover information from within your IDE. You can also run the typechecker directly to confirm that you have no type errors in any files in your project.
$ cd my_project
$ hh_client
No errors!​
5. Run Your Program : HHVM provides the Hack runtime. You can run your program as follows :
$ cd my_project
$ hhvm hello.hack
Hello World!​
6. Run A Website : Normally you'll start
HHVM as a webserver, and it will automatically pick up any changes to files you make.
$ cd my_project
$ hhvm -m server -p 8080​
You can now visit
http://localhost:8080/hello.hack to see "
Hello World!" in your browser.
