# Data flow — rollup/rollup

> Canonical page: https://codevetter.com/unpack/rollup/data-flow

# Data flow — rollup/rollup

Scanned commit a77225f4b9ef88f20d26a32a3dc70954241f3fb6 (2026-10-02). Generated by codevetter codevetter 1.15.0 on 2026-10-02.

Source inspection; upstream code and tests were not executed.

Input options become a normalized build configuration and then a graph of resolved modules. Loaded source passes through transform hooks before parsing and inclusion analysis. Rendering constructs output chunks, resolves content hashes, and returns files or writes them through a filesystem adapter. Incremental state is represented by module and plugin caches retained by callers or watch tasks.
- getInputOptions first processes plugin options hooks, then normalizes input options and assigns anonymous plugin names. — [src/rollup/rollup.ts#L140-150](https://github.com/rollup/rollup/blob/a77225f4b9ef88f20d26a32a3dc70954241f3fb6/src/rollup/rollup.ts#L140-L150) [src/rollup/rollup.ts#L153-189](https://github.com/rollup/rollup/blob/a77225f4b9ef88f20d26a32a3dc70954241f3fb6/src/rollup/rollup.ts#L153-L189)
- resolveId asks plugins first; fallback resolution handles entry/relative/absolute paths, tries .mjs and .js, and optionally dereferences symlinks. — [src/utils/resolveId.ts#L20-60](https://github.com/rollup/rollup/blob/a77225f4b9ef88f20d26a32a3dc70954241f3fb6/src/utils/resolveId.ts#L20-L60) [src/utils/resolveId.ts#L64-90](https://github.com/rollup/rollup/blob/a77225f4b9ef88f20d26a32a3dc70954241f3fb6/src/utils/resolveId.ts#L64-L90)
- addModuleSource obtains the first non-null load result or reads UTF-8 through options.fs, validates its code shape, and strips the BOM. — [src/ModuleLoader.ts#L273-312](https://github.com/rollup/rollup/blob/a77225f4b9ef88f20d26a32a3dc70954241f3fb6/src/ModuleLoader.ts#L273-L312)
- transform reduces source through transform hooks while recording sourcemaps, watched transform dependencies, emitted files, and custom-cache usage. — [src/utils/transform.ts#L39-50](https://github.com/rollup/rollup/blob/a77225f4b9ef88f20d26a32a3dc70954241f3fb6/src/utils/transform.ts#L39-L50) [src/utils/transform.ts#L78-96](https://github.com/rollup/rollup/blob/a77225f4b9ef88f20d26a32a3dc70954241f3fb6/src/utils/transform.ts#L78-L96) [src/utils/transform.ts#L111-136](https://github.com/rollup/rollup/blob/a77225f4b9ef88f20d26a32a3dc70954241f3fb6/src/utils/transform.ts#L111-L136)
- Module.setSource stores code and maps, initializes MagicString and AST context, then uses a provided AST or parseAsync plus convertProgram. — [src/Module.ts#L868-898](https://github.com/rollup/rollup/blob/a77225f4b9ef88f20d26a32a3dc70954241f3fb6/src/Module.ts#L868-L898) [src/Module.ts#L900-945](https://github.com/rollup/rollup/blob/a77225f4b9ef88f20d26a32a3dc70954241f3fb6/src/Module.ts#L900-L945)
- ModuleLoader recursively fetches static/dynamic dependencies, links imports, and awaits moduleParsed; Graph then orders modules, binds references, and includes statements. — [src/ModuleLoader.ts#L448-485](https://github.com/rollup/rollup/blob/a77225f4b9ef88f20d26a32a3dc70954241f3fb6/src/ModuleLoader.ts#L448-L485) [src/Graph.ts#L114-128](https://github.com/rollup/rollup/blob/a77225f4b9ef88f20d26a32a3dc70954241f3fb6/src/Graph.ts#L114-L128) [src/Graph.ts#L221-230](https://github.com/rollup/rollup/blob/a77225f4b9ef88f20d26a32a3dc70954241f3fb6/src/Graph.ts#L221-L230)
- renderChunks renders chunks, transforms them and obtains content-hash inputs, computes final dependency-sensitive hashes, and adds resulting chunks to the output bundle. — [src/utils/renderChunks.ts#L40-86](https://github.com/rollup/rollup/blob/a77225f4b9ef88f20d26a32a3dc70954241f3fb6/src/utils/renderChunks.ts#L40-L86)
- Graph.getCache serializes modules and plugin cache entries with expiry eviction; writeOutputFile resolves the destination and persists asset sources or chunk code through injected mkdir/writeFile. — [src/Graph.ts#L131-146](https://github.com/rollup/rollup/blob/a77225f4b9ef88f20d26a32a3dc70954241f3fb6/src/Graph.ts#L131-L146) [src/rollup/rollup.ts#L312-322](https://github.com/rollup/rollup/blob/a77225f4b9ef88f20d26a32a3dc70954241f3fb6/src/rollup/rollup.ts#L312-L322)

Every claim links to its cited files at the pinned commit. Citations identify source evidence; they do not establish runtime correctness. Independent CodeVetter scan — not reviewed by upstream maintainers.

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