DevImpact — Change Impact Analyzer

Before you change code, see what depends on it, what could break and which tests to run.

DevImpact reads your repository locally, builds a dependency graph and combines it with git diff. It answers three questions for any change:

What depends on this? Files that use the changed functions directly, with the symbols they reference, plus everything reachable 2, 3… hops away.
How risky is it? An impact score (low / medium / high) based on blast radius, core files and test coverage.
Which tests should I run? Tests that import the changed code (directly or transitively) and tests named after it, with a ready-to-run command for Jest, Vitest, Mocha, pytest, Maven, Gradle, Go or RPGUnit.

How to use it

Where	What
Source Control → Change Impact view	Updates automatically for your uncommitted changes. ▶ runs the recommended tests.
Right-click a function → What Does Changing This Function Affect?	Impact of one function or class, even before you edit it.
Right-click a file → What Does Changing This File Affect?	Impact of a whole file.
CodeLens above functions	“⚡ 4 files use this”. Click it for the full analysis.
`DevImpact: Analyse Branch vs Base…`	Everything your branch changes compared with `origin/main`.
`DevImpact: Copy Impact Report`	Markdown summary for your pull-request description.
Copilot agent mode: `#changeImpact`	Lets the AI check impact before it edits code.

Languages

TypeScript/JavaScript, Python, Java/Kotlin, Go, C# (symbols) and IBM i: RPGLE/SQLRPGLE copybooks, programs, procedures and files, CL calls, DDS and SQL tables. On IBM i, changing a physical file shows every program that uses it.

Settings

Setting	Default
`devimpact.codeLens`	`true`	Show “N files use this” above functions
`devimpact.autoRefresh`	`true`	Re-run the last analysis on save
`devimpact.maxDepth`	`6`	Dependency hops to follow
`devimpact.baseRef`	auto	Base branch for branch analysis

Everything runs locally; no code leaves your machine.

Part of DevSuite: RepoPilot · DevImpact · CodeGuard · TraceLens · BugTrail.

DevImpact — Change Impact Analyzer

Gaurav Gupta-GG

DevImpact — Change Impact Analyzer

How to use it

Languages

Settings