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Legacy Migration & Framework Upgrading

1.1. Use Case Name​

Legacy Migration & Framework Upgrading

1.2. Tags​

Migration

1.3. Introduction​

Modernizing a codebase—whether migrating from JavaScript to TypeScript or upgrading legacy versions of React and Angular—is often a manual, error-prone process. CodeVista streamlines this transition by automating code conversion, identifying deprecated syntax, and ensuring compatibility with the latest framework versions and Nx workspace standards.

1.4. Outcome​

  • Seamless Language Transition: Convert JavaScript files to TypeScript with accurate type definitions and minimal manual fixing.
  • Version Compatibility: Upgrade React or Angular versions by automatically replacing legacy lifecycle methods or deprecated APIs with modern equivalents.
  • Monorepo Optimization: Efficiently migrate projects into or between Nx workspace versions while maintaining structural integrity.
  • Reduced Technical Debt: Clean up outdated patterns during the migration process to improve long-term maintainability.

1.5. Starter Prompt​

Analyze the attached JavaScript code and migrate it to TypeScript. Ensure all variables and function parameters have appropriate types. Additionally, if there are any deprecated React patterns, upgrade them to the latest version using functional components and hooks.

[Paste your code here]

1.6. Inputs Required​

  • Source Files: The specific files or folders targeted for migration or upgrade.
  • Target Version/Language: Clear indication of the desired end state (e.g., "Migrate this React 16 component to React 18 using Hooks").
  • Configuration Context: (Optional) Existing tsconfig.json or package.json to help CodeVista understand the project dependencies.

1.7. Prerequisites​

  • Existing source code in JavaScript or an older version of a supported framework (React/Angular).
  • Target framework or language environment set up in the project.
  • CodeVista extension installed.

1.8. How to Use​

  1. File Migration: Open a .js file and use the CodeVista prompt to "Convert this file to TypeScript." Review the generated .ts code and interface definitions.
  2. Framework Upgrade: Highlight a component or service and ask CodeVista to "Upgrade this logic to the latest [React/Angular] version."
  3. Nx Refactoring: Use the chat to ask for guidance on moving a library or project into an Nx monorepo structure based on existing source code.
  4. Verify: After the migration, run your build/lint tools to verify that CodeVista has correctly identified and applied the necessary changes.