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docs: document function coverage in deno coverage (2.8) #3093

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20 changes: 20 additions & 0 deletions runtime/reference/cli/coverage.md
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Expand Up @@ -128,6 +128,26 @@ console.log("This line is ignored");
console.log("This line is not ignored");
```

## Function coverage

Starting in Deno 2.8, the summary table and the HTML report include a
**function coverage** column alongside the existing branch and line columns:

```
----------------------------------
File | Branch % | Line % | Function %
----------------------------------
main.ts | 85.7 | 92.3 | 100.0
util.ts | 75.0 | 88.5 | 66.7
----------------------------------
all files | 80.0 | 90.5 | 83.3
----------------------------------
```

Function coverage measures the percentage of declared functions that were
called at least once during the test run. The same data was already written
to `lcov` output — Deno 2.8 just surfaces it in the human-readable reporters.

## Output Formats

By default we support Deno's own coverage format - but you can also output
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