Parse a Next.js .next directory and load route and chunk footprint data for later analysis.

Rank the heaviest user-facing routes in a loaded Next.js build by emitted chunk bytes.

Rank the heaviest shared chunks in a loaded Next.js build and show which routes depend on them.

Compare two loaded Next.js builds and show which routes and chunks grew or shrank the most.

Identify which routes and chunks are responsible for bundle size growth between two loaded builds. Returns severity-ranked route findings, the top growing chunks, and an overall regression summary.

Explain how to generate the webpack stats file (.next/stats.json) required by the bundle attribution tools. Choose manual (a recipe you apply yourself) or automatic (an action plan Copilot executes).

Parse the webpack module stats file (.next/stats.json) and link it to a build loaded with load_build_stats. Unlocks the stats-powered tools: suggest_optimizations (enriched), find_duplicates, explain_shared_chunks, and trace_import.

Explain why a module is bundled by tracing its import chain from an entry point to the module. moduleSizeBytes is the unminified webpack module size, not emitted chunk size. Requires load_webpack_stats first.

Find npm packages whose code is bundled into more than one chunk, wasting bytes, ranked by wasted bytes. Requires load_webpack_stats first.

Show which npm packages and app code dominate the shared chunks loaded by many routes, to identify what bloats common bundles. Each package reports its unminified webpack module size, its share of the chunk's module bytes, and that share applied to the chunk's emitted size. Requires load_build_stats and load_webpack_stats first.

Aggregate route, chunk, and (when loaded) webpack-stats evidence into severity-ranked, evidence-backed bundle optimizations tied to concrete Next.js actions. Every suggestion is sized in emitted on-disk bytes. Works on manifests alone; load_webpack_stats first for dedupe, shared-chunk, and package-import suggestions.