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Fb Get Code Coverage

hphp/hack/manual/apis/Functions/fb_get_code_coverage.md

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:::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. :::

Returns code coverage data collected so far

Hack
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
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