JavaScript & TypeScript Modernization at Enterprise Scale

The first type-attributed refactoring engine for JavaScript and TypeScript. Coordinate React, Angular, and Node.js modernization across thousands of repositories, safely, deterministically, and side by side with your Java backend.

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For the first time, JavaScript and TypeScript can be refactored semantically, not by syntax matching, regex, or string replacement.

Until now, JavaScript refactoring at scale meant choosing between fragile codemods, syntax-bound AST tools, or brittle regex. Moderne represents JavaScript and TypeScript in the OpenRewrite Lossless Semantic Tree (LST), a type-attributed, format-preserving model that resolves symbols, traces dependencies, and applies changes deterministically across thousands of repositories.

Why JavaScript modernization breaks down at scale

The result: modernization stalls. Repositories drift. Security debt compounds. And the JavaScript half of your stack falls behind everything else.

Scattered tooling, no shared foundation. Codemods, ESLint plugins, ts-morph scripts, and bespoke jscodeshift transforms each solve a slice of the problem with no common standard.
Syntax-bound, not semantic. Most JS refactoring tools operate on raw AST nodes. They can't distinguish between lookalike methods, resolve types, or follow imports across files.
Imports alone are a moving target. CommonJS require, ES6 imports, namespace imports, destructuring. Every codemod author re-implements the same logic, inconsistently, in every script.
No orchestration across repositories. Codemods run repo-by-repo with no shared reporting, no impact analysis, and no way to answer "where else is this pattern hiding?"
Formatting damage on every run. Tools that don't preserve whitespace produce diffs that are noisy, hard to review, and frequently rejected by reviewers.
Framework churn never stops. Node.js LTS rotates every year. React, Angular, and Next.js ship breaking changes on their own cadence. Manual migration can't keep up.

What to look for in a JavaScript modernization platform

Enterprise JavaScript teams need a platform that understands code semantically, coordinates change across hundreds of repositories, and operates inside the same governance model as the rest of the stack.

Type-attributed refactoring

Resolves types, symbols, and dependencies, so changes distinguish between lookalike methods and don't break on edge cases that AST tools miss.

Multi-repository orchestration

Coordinates changes across hundreds of repositories in a single run, with shared reporting, impact analysis, and reviewable pull requests.

Codemod and ESLint consolidation

Brings curated codemods, ESLint plugins, and native LST recipes into one execution layer, so teams don't have to maintain a patchwork of tools.

Style and formatting preservation

Keeps existing whitespace, formatting, and code style intact so diffs are clean, idiomatic, and easy for reviewers to merge.

Cross-language coordination

Runs JavaScript and TypeScript transformations in the same campaign as Java, Python, and infrastructure changes.

Coding-agent ready

Provides a semantic foundation that AI coding agents can reason against, plus a governed execution layer that applies their changes safely at scale.

On-demand webinar

Automated Code Changes at Scale

Engineers from Netflix, Airbnb, and LinkedIn share how they tackle automated code changes at scale — and get developers to actually review and merge the PRs.

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The JavaScript modernization platform built for enterprise scale

Moderne represents JavaScript and TypeScript in the OpenRewrite Lossless Semantic Tree (LST). Recipes execute against that model deterministically, across thousands of repositories, through the same governed workflow used for Java modernization.

Upgrade Node.js runtimes across every repository

Run a single recipe to migrate Node.js versions, replace deprecated util.isX() calls with native equivalents, and update imports consistently across CommonJS, ES6 imports, and destructuring styles. Because the LST understands types, recipes distinguish between util.isArray() and an unrelated isArray(), eliminating false positives.

Migrate frontend frameworks at portfolio scale

Coordinate React, Angular, and Next.js upgrades across hundreds of repositories at once. Moderne runs curated codemods alongside native LST recipes, with full reporting on what changed, where, and what's left.

React: hooks adoption, class-to-function migration, deprecated API replacement
Angular: AngularJS to modern Angular paths, version-to-version upgrades
Next.js: framework upgrade codemods, App Router migrations
JavaScript: ES5 to ES6, JavaScript to TypeScript

Run JavaScript codemods at scale

Moderne becomes the centralized hub for the entire codemod ecosystem. Hundreds of curated codemods, including jscodeshift transforms and ESLint plugins, execute through the same platform with shared orchestration, reporting, and pull request workflows.

Analyze and audit JavaScript portfolios

Answer questions that were impossible at scale: "Where is this method used across thousands of repos?" "What breaks if we change this API?" "Where are deprecated patterns still hiding?" The LST generates portfolio-wide data tables on React hooks, Angular services, security patterns, and architectural usage.

Coordinate frontend and backend change in one campaign

Trace data and control flow end-to-end: from a React form, through a Spring backend, into an API response. Run a single campaign that updates frontend code, backend services, and infrastructure together, instead of three sequential migrations that drift out of sync.

JavaScript doesn't live alone, and now neither does its modernization

Modernization campaigns can finally span the full stack, from React frontend through Spring backend to Kubernetes manifests, in a single coordinated run.

import { util } from 'util';
class Order {
  total: number;
  submit(items: T[]) {}
}

Markers

JavaScriptSourceSet

PackageJson

Syntax

JS.CompilationUnit

J.ClassDeclaration Order

J.MethodDeclaration submit()

J.Block

Type Attribution

JavaType.Class(Iterable), implements

JavaType.Class(Order), declaring type

JavaType.Methodsubmit(..), overrides

Trace data flow across the stack

Follow untrusted input from a React form through a Spring controller into an API response, for security analysis, compliance audits, or impact assessment.

Coordinate API changes end-to-end

Pair a backend API rename in Java with the corresponding fetch call updates in TypeScript clients. One run, one PR set, no drift.

Run security campaigns across runtimes

Remediate a CVE that touches both npm and Maven dependencies in a single campaign, instead of running two parallel projects with separate review cycles.

Our developers now spend less time worrying about legacy code and more time focusing on value-driven work.

Jason Simpson

VP of Engineering, Choice Hotels

JavaScript and TypeScript recipe coverage

Moderne's JS support spans two execution layers: native LST recipes built on type-attributed semantic understanding, and curated codemods running through the same platform infrastructure:

Native LST recipes (5 categories)
Cleanup, Dependencies, Format, Migrate (ES6 + TypeScript), and Search. Type-attributed transformations that preserve formatting and resolve symbols across files.
Curated codemods (hundreds of recipes)
Best-in-class jscodeshift transforms, ESLint plugins, and framework migration codemods (React, Angular, Next.js, AngularJS) running through the Moderne platform with full orchestration and reporting.
Cross-language reuse
Java recipes like find methods, find types, and change method name work directly on JavaScript with little or no modification, so you get value from day one without re-authoring everything.

All JavaScript Recipes

Moderne vs. JavaScript codemod tooling

Most JavaScript modernization tooling, including jscodeshift, ts-morph, ast-grep, Babel codemods, and ESLint plugins, is designed for working in a single repository. Moderne is the only platform that operates across thousands of repositories with type-attributed semantic understanding.

Moderne

Type-attributed semantic refactoring

Lossless Semantic Trees resolve types, symbols, and dependencies. Recipes distinguish between lookalike methods and trace data flow across files, no false positives, no missed cases.

Enterprise-scale orchestration

Applies recipes across hundreds of repositories in a single coordinated run, with impact analysis, shared reporting, and reviewable pull requests at every step.

Codemod ecosystem hub

Hundreds of curated codemods and ESLint rules execute through the same platform: one access point, one execution layer, one reporting model for the entire JS toolchain.

Format and style preservation

Whitespace, comments, and existing code style are preserved on every run. Reviewers see only the actual change, not a diff full of formatting noise.

Full-stack coordination

JS, TS, Java, Python, and infrastructure share one LST and one execution model. Run frontend and backend changes in the same campaign.

jscodeshift, ts-morph, ESLint plugins

Syntax-bound AST manipulation

Operates on raw syntax trees without type information. Authors re-implement import handling, symbol resolution, and edge cases for every codemod they write.

Single-repository execution

Runs one repo at a time. No shared orchestration, no multi-repo reporting, no impact analysis across the portfolio. Coordination is left to whoever runs the script.

Fragmented tooling

jscodeshift for one transform, ts-morph for another, an ESLint plugin for a third. Each has its own configuration, distribution, and execution model.

Frequent formatting damage

Most AST-based tools rewrite whitespace, comments, and trailing characters in ways reviewers reject. Diff noise frequently outweighs the actual change.

Language-isolated

Designed for JS/TS only. Cannot coordinate with backend Java services, Python data pipelines, or infrastructure changes. Those run separately.

Modernize your JavaScript and TypeScript portfolio with confidence

Framework upgrades, Node.js migrations, and codemod runs don't have to compete with product delivery. Moderne applies safe, type-attributed transformations across your entire JavaScript estate, alongside the rest of your stack.