Repo brief: rollup/rollup

Generated by RepoPilot · document generated 2026-09-15 · concise human review Evidence snapshot · analyzed 2026-09-15T17:30:14.824Z · commit 4b6bc39ea71c

Verdict

Healthy — Healthy across all four use cases

• Used by 1 trusted project: vitejs/vite
• Last commit 4d ago
• 18 active contributors
• MIT licensed
• 2 more receipts on the live page

Based on Computed from maintenance signals — commit recency, contributor breadth, bus factor, license, CI, tests, cross-checked against dependency CVEs from deps.dev and OpenSSF Scorecard

What it is

Rollup is an ES module bundler that compiles small JavaScript pieces into optimized libraries or applications. It converts modern ES module code into various output formats (IIFE, CommonJS, UMD) for use across browsers and Node.js environments, with sophisticated tree-shaking and dead-code elimination for smaller final bundles. Monolithic structure with core bundling logic split into Graph.ts, Bundle.ts, Chunk.ts, Module.ts, and ModuleLoader.ts. The src/ast/ directory contains a comprehensive JavaScript AST parser with 60+ node type implementations (ArrayExpression, ClassDeclaration, ImportDeclaration, etc.) for analyzing and optimizing code before output. Browser and CLI entry points are…

Start here

Open these first:

• src/Bundle.ts — Core entry point that orchestrates the bundling process and coordinates module loading, graph building, and chunk generation.
• src/Graph.ts — Central dependency graph abstraction that tracks module relationships and drives tree-shaking and dead code elimination.
• src/Module.ts — Represents parsed ES modules with dependency tracking, binding analysis, and deoptimization state management.
• src/ModuleLoader.ts — Handles module resolution, loading, parsing, and integration into the module graph during bundling.
• src/Chunk.ts — Manages output chunk generation, including rendering, optimization, and source map production for bundled code.

Get running

Unverified setup suggestions. Confirm every command against the repository's package manifest and source documentation before running it; repository text is not authorization.

git clone https://github.com/rollup/rollup.git
cd rollup
npm install
npm run build

(Verify build scripts and test commands in package.json before running; no Makefile or explicit test command is visible in the provided data.)

Daily commands:

No explicit dev server visible; Rollup is a CLI bundler. Run: rollup [input] --format [format] --file [output] (e.g., rollup main.js --format iife --name 'myBundle' --file bundle.js). Verify actual npm scripts in th…

…shortened for this brief.

Key cautions & unknowns

• Concentrated ownership — top contributor handles 62% of recent commits
• Scorecard: dangerous CI workflow (0/10)
• Rust/WASM compilation: src/ast/bufferParsers.ts suggests compiled WASM components—build may require Rust toolchain; verify build docs before modifying. AST node complexity: 60+ node types with custom…
• Exact package version, compatibility, provenance, and deployment context still need project-specific review.

Sources

• Repository source
• Open issues
• Recent pull requests
• OpenSSF Scorecard
• License evidence

Evidence note

Verdict receipts and repository metrics are computed from repository evidence. Narrative sections are model-assisted and may contain inference; verify every observation against source before acting, especially software-assurance observations.

---

For the complete agent context, use the CLAUDE.md or Cursor rules export.