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gen

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.

public function gen<TStreamResponse>(
  (function(?string, ?Exception): TStreamResponse) $streamDecode,
): HH\AsyncGenerator<null, TStreamResponse, void>;

Parameters​

  • (function(?string, ?Exception): TStreamResponse) $streamDecode

Returns​