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Hack Standard Library

JSON →
library 4.108.1 ·php
✓ verified Jun 19, 2026
utility

The Hack Standard Library providing collections, I/O, and other utilities for Hack language.

Resources

githubgithub.com/hhvm/hsl ↗
homepagegithub.com/hhvm/hsl ↗

API endpoints

full doc /v1/registry/hhvm-hsl
install /v1/registry/hhvm-hsl/install