From Environment

:::info[Note] This is a point-in-time snapshot of the API documentation from January 2026. Going forward, we will not be maintaining a public copy of these references, and recommend users to refer to the built-in signature helpers available in the Hack LSP instead for complete and up-to-date information. :::

Retrieve the active locale from the native environment

namespace HH\Lib\Locale;

function from_environment(): Locale;

This is usually set based on the LC_* environment variables.

Web applications targeting diverse users should probably not use this, however it is useful when aiming to support diverse users in CLI programs.

Returns

• Locale