Ffp Json Dfs

:::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. :::

namespace HH\ExperimentalParserUtils;

function ffp_json_dfs(
  mixed $json,
  bool $right,
  (function(varray_or_darray): ?varray_or_darray) $predicate,
  (function(varray_or_darray): bool) $skip_node,
): ?varray_or_darray;

Parameters

• mixed $json
• bool $right
• (function(varray_or_darray): ?varray_or_darray) $predicate
• (function(varray_or_darray): bool) $skip_node

Returns

• ?varray_or_darray