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fb_get_code_coverage

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.

Returns code coverage data collected so far

function fb_get_code_coverage(
  bool $flush,
): mixed;

Turn on code coverage by Eval.RecordCodeCoverage or by using fb_enable_code_coverage and call this function periodically to get results. Eval.CodeCoverageOutputFile allows you to specify an output file to store results at end of a script run from command line. Use this function in server mode to collect results instead.

Parameters​

  • bool $flush - Whether to clear data after this function call.

Returns​

  • darray<string,mixed>|false