Extract

:::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. :::

For each path/hash pair in $pathsAndHashes, parse the file on the filesystem, or lookup the file with the given SHA1 hash, and return a dict mapping each path to its contents

namespace HH\Facts;

function extract(
  vec<(?string)> $pathsAndHashes,
  ?string $root = NULL,
): dict<string, ?FileData>;

Each given path should be relative to the given $root.

Parameters

• vec<(?string)> $pathsAndHashes
• ?string $root = NULL

Returns

• dict<string, ?FileData>