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Solutions

Understand the system. Move the work forward.

From your first day in a codebase to the next architectural decision. Put relationships, source and engineering questions in the same picture.

From entry point to supporting code

The checkout entry point reaches a service, its payment and order dependencies, a validation contract and a test. Lines illustrate static relationships, not runtime execution.

Entry pointcheckout.test.ts
01
Checkout servicecheckout-service.ts
02
Payment gatewaypayment-gateway.ts
03
Order moduleorder-service.ts
04
Validation contractvalidation.ts
05
Related checkscheckout.test.ts
06
Selected module · Static relationships · Supporting checks
A change has a direction

A validation change can affect its checkout consumer and the tests associated with that consumer. Reachability identifies candidates for review; it does not prove a defect.

Validation changeSelected source
01
CheckoutDependent module
02
Order contractBoundary to inspect
03
Checkout testsReview candidates
04
Review scopeInspect source evidence
05
Change → potential dependents → review candidates
Change impactExplorer

Understand the reach of a change

A small edit to shared code can affect callers in unexpected places.

Explore dependencies, callers and related tests before changing a shared interface or implementation.

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