Legacy Code Modernization Tracking

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The Modernization Question

Leadership asks: "How much of the legacy code is migrated?"

You say: "We think... maybe 60%?"

Migration Phases with Buoy

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Baseline

Scan your legacy codebase to understand the current state. How many hardcoded values? How many duplicate components?

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Track

As you migrate, track progress with real metrics. See adoption grow week over week, sprint over sprint.

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Enforce

Once migrated, enforce the new patterns. Block PRs that introduce new legacy patterns.

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Report

Show leadership exactly how much is done, what's left, and the trend. No more "we think 60%".

Track Progress with Real Data

buoy-cli

Migration Progress

═══════════════════════════════════════

Legacy Code: 38% ███████░░░░░░░░░░░

In Progress: 15% ███░░░░░░░░░░░░░░░

Migrated: 47% █████████░░░░░░░░░

This sprint: +8% migrated

Velocity: ~12% per sprint

ETA: 3 more sprints to 100%

Configuration for Migrations

.buoy.yaml

# .buoy.yaml

# Define what "legacy" means
legacy:
  # Legacy directories to track
  directories:
    - "src/legacy/"
    - "src/old-components/"

  # Legacy patterns to detect
  patterns:
    - 'className="legacy-*"'
    - "import.*from.*@old-design-system"

  # Mark files with this comment as legacy
  markers:
    - "@legacy"
    - "deprecated-marker"

# Modern design system reference
tokens:
  source: "./src/tokens"

# Track migration progress
migration:
  enabled: true
  trackBy: directory  # or file or component

What You Get

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Exact Numbers

Not "we think 60%" but "47.3% migrated, up 8% from last sprint"

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Velocity Tracking

Know your migration velocity and estimate completion dates

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Prevent Regression

Block PRs that add new legacy code to migrated areas

Free PDF

Planning a token migration?

Step-by-step playbook for migrating from hardcoded values to design tokens. Avoid the common pitfalls.

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Modernization Tracking