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feat: add the dependency-graph primitives package - #6
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Stryker's vitest runner reports no killed mutants against vitest 5: every mutant survives with almost no tests run per mutant. The 4.x line kills them as expected, so it is the one the mutation testing in this workspace can use.
Each package's stryker.config.ts calls packageStrykerConfig, so thresholds and plugin wiring live in one place. Plugins are listed explicitly because Stryker's default discovery cannot see siblings under pnpm's isolated node_modules.
@exadev/process-graph-dag builds an immutable graph once from a node set and a needs accessor and analyses it with plain functions: topological layers, ancestors, descendants, cycles, transitive reduction and the critical path. Unknown references and cycles are returned as data, cyclic input to an operation that needs acyclicity throws an error carrying the cycles, and every traversal is iterative so depth cannot overflow the call stack.
Knip resolves the plugins through the Stryker config itself, so the ignore entries only produced configuration hints.
Mearman
marked this pull request as ready for review
October 10, 2026 08:47
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Adds
@exadev/process-graph-dag, the dependency-graph primitives the domain layer and ci-adapters will both build on. It takes a node set and aneedsaccessor, builds an immutable graph once, and exposes plain functions over it: topological layers, ancestors, descendants, cycles, transitive reduction and the critical path for a caller-supplied weight.Generalised from ci-adapters'
dependencyLevelsandancestorsOfand from Graphle's reachability. Unlike the former, an unknownneedstarget and a cycle are returned as data instead of being absorbed or recursing forever, and nothing is recursive.The branch also adds the shared Stryker configuration this package uses, and pins vitest to 4.x: Stryker's vitest runner kills no mutants against vitest 5 (almost no tests run per mutant) and works on 4.1.
Cycle and tie-break semantics are in the package README. Before marking ready I ran the repo's
lint,typecheck,test,test:smoke,test:coverage,deps:lint,knip,build:tscand the package's attw and publint from a clean clone with a frozen lockfile.