[prisis]

Fixes #107.

When the benchmark file and the plugin resolve different copies of vitest (pnpm installs one per set of peers, e.g. one per vite major), the plugin reads an empty benchmark registry. The analysis runner then failed with a bare TypeError: fn is not a function. runAnalysisBench now checks the result of getBenchFn and, when it isn't a function, throws an error that names the benchmark, the likely cause and the fix.

This doesn't change which vitest the runner imports. That's the larger change discussed in the issue.

Test

should explain a benchmark function it cannot find makes getBenchFn return undefined and asserts the new message. It fails on main with fn is not a function. lint, typecheck, format and the plugin's 15 tests pass.

🤖 Generated with Claude Code

[greptile-apps]

Confidence Score: 5/5

[Low impact] The PR appears safe to merge.

Summary

The legacy Vitest analysis runner now explains why it cannot find a benchmark function instead of failing with fn is not a function.

• The analysis runner explains when a benchmark function is missing.

_{Reviews (1) · Last reviewed commit: "fix(vitest-plugin): explain a missing be..." · Reviewed by Greptile}