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Add bundle-viz app: interactive Recharts Treemap/Sunburst bundle size visualization#7037

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copilot/add-bundle-visualization-tool
Feb 23, 2026
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Add bundle-viz app: interactive Recharts Treemap/Sunburst bundle size visualization#7037
PavelVanecek merged 7 commits intomainfrom
copilot/add-bundle-visualization-tool

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Copilot AI commented Feb 21, 2026

Description

Adds two on-demand developer tools for understanding and debugging tree-shaking and bundle composition:

bundle-viz/ — standalone Vite + React app

  • Tab-toggles between Treemap (rectangles sized by rendered bytes, coloured by source directory) and Sunburst (same data as concentric rings)
  • Stats header: total size, module count, directory count, component list
  • Directory colour legend
  • Aliases recharts → ../src via Vite so no separate build step is required

scripts/generate-bundle-data.ts — data pipeline feeding the app

  • Runs rollup tree-shaking, groups modules by source directory path, computes per-node byte totals recursively, writes hierarchical JSON to bundle-viz/src/bundle-data.json

scripts/treeshaking.ts — extended with getModuleGraph() (previous PR) supporting generate-bundle-data

Usage

npm run build-es6
npm run generate-bundle-data           # defaults to all tracked components
npm run generate-bundle-data -- Area   # or a specific set
cd bundle-viz && npm install && npm run dev   # http://localhost:3001

Related Issue

Bundle size visualization tooling follow-up.

Motivation and Context

The existing tree-shaking tests document what ends up co-bundled but give no visual sense of how much each file contributes. This app answers that question at a glance, and makes it easy to spot unexpectedly large modules or directories.

How Has This Been Tested?

  • Generated real data for all 34 tracked components and verified both chart views render correctly
  • Verified app builds cleanly with both the placeholder and real data
  • All 40 existing treeshaking tests pass unchanged

Screenshots (if appropriate):

Treemap view
Treemap

Sunburst view
Sunburst

Types of changes

  • Bug fix (non-breaking change which fixes an issue)
  • New feature (non-breaking change which adds functionality)
  • Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

  • My change requires a change to the documentation.
  • I have updated the documentation accordingly.
  • I have added tests to cover my changes.
  • I have added a storybook story or VR test, or extended an existing story or VR test to show my changes

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

  • storybook.js.org
    • Triggering command: /opt/hostedtoolcache/node/24.13.0/x64/bin/node node /home/REDACTED/work/recharts/recharts/node_modules/.bin/vitest run scripts/treeshaking.test.ts /pro�� d" | sort | uniq3001 0/x64/bin/node h (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

Original prompt

This section details on the original issue you should resolve

<issue_title>Bundle size visualization</issue_title>
<issue_description>In #7032 we have added a script that creates a bundle with tree-shaking enabled. We have also added tests that show which components are pulled together, which highlights some problems we have with tree-shaking. Next task is to debug 1. why these components are pulled together and 2. if it is a problem

The task is:

  1. Add a visualization tool that shows which file contributes how much kB.
  2. Add a debug trace tool that shows why does component A include component B. For example, if I import Area component, the final bundle has Pie in it. Why?

This visualization and trace can run only on-demand, it does not need to be integrated with CI. If you need to add any dependencies make sure they are dev-only, and none of this ends up in the npm package.</issue_description>

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Summary by CodeRabbit

  • New Features

    • Added bundle visualization tool to analyze package size contributions via interactive Treemap and Sunburst views.
    • Added new npm scripts for bundle analysis: visualize-bundle, trace-bundle, and generate-bundle-data.
  • Chores

    • Enhanced CI workflow with Node.js initialization.
    • Updated build tooling configurations and ignores for bundle analysis artifacts.
    • Improved treeshaking validation with dynamic component tracking.

…ging

- scripts/visualize-bundle.ts: generates interactive HTML report showing
  which source files contribute how much kB to the tree-shaken bundle
- scripts/trace-bundle.ts: shows import chain(s) why component A causes
  component B to be in the bundle
- scripts/treeshaking.ts: extract helpers, add getModuleGraph() function
- package.json: add visualize-bundle and trace-bundle npm scripts
- .gitignore: ignore bundle-visualization.html output file

Co-authored-by: PavelVanecek <1100170+PavelVanecek@users.noreply.github.com>
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@copilot How hard would it be to have the bundle visualisation represented by Recharts treemap chart? Or sunburst chart?

Copilot AI changed the title [WIP] Add bundle size visualization tool and debug trace feature Add bundle visualization and import trace tools for tree-shaking debugging Feb 21, 2026
Copilot AI requested a review from PavelVanecek February 21, 2026 14:37
…tion

- bundle-viz/: standalone Vite+React app that shows bundle sizes using
  Recharts Treemap and SunburstChart, colour-coded by directory
- scripts/generate-bundle-data.ts: builds tree-shaken bundle and writes
  hierarchical JSON (grouped by source directory) to bundle-viz/src/bundle-data.json
- package.json: adds generate-bundle-data npm script
- .gitignore: ignores bundle-viz/node_modules and bundle-viz/dist
- eslint.config.mjs: excludes bundle-viz from root eslint

Co-authored-by: PavelVanecek <1100170+PavelVanecek@users.noreply.github.com>
Copilot AI changed the title Add bundle visualization and import trace tools for tree-shaking debugging Add bundle-viz app: interactive Recharts Treemap/Sunburst bundle size visualization Feb 22, 2026
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codecov bot commented Feb 22, 2026

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 90.13%. Comparing base (15b5407) to head (75befa4).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files
@@           Coverage Diff           @@
##             main    #7037   +/-   ##
=======================================
  Coverage   90.12%   90.13%           
=======================================
  Files         526      526           
  Lines       39242    39254   +12     
  Branches     5438     5438           
=======================================
+ Hits        35368    35380   +12     
  Misses       3865     3865           
  Partials        9        9           

☔ View full report in Codecov by Sentry.
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codecov bot commented Feb 22, 2026

Bundle Report

Changes will increase total bundle size by 1.19kB (0.02%) ⬆️. This is within the configured threshold ✅

Detailed changes
Bundle name Size Change
recharts/bundle-cjs 1.27MB 374 bytes (0.03%) ⬆️
recharts/bundle-es6 1.1MB 374 bytes (0.03%) ⬆️
recharts/bundle-umd 542.99kB 72 bytes (0.01%) ⬆️
recharts/bundle-treeshaking-cartesian 632.47kB 374 bytes (0.06%) ⬆️

Affected Assets, Files, and Routes:

view changes for bundle: recharts/bundle-cjs

Assets Changed:

Asset Name Size Change Total Size Change (%)
cartesian/Bar.js 329 bytes 28.55kB 1.17%
state/selectors/barStackSelectors.js 45 bytes 2.44kB 1.88%
view changes for bundle: recharts/bundle-umd

Assets Changed:

Asset Name Size Change Total Size Change (%)
Recharts.js 72 bytes 542.99kB 0.01%
view changes for bundle: recharts/bundle-es6

Assets Changed:

Asset Name Size Change Total Size Change (%)
cartesian/Bar.js 329 bytes 26.8kB 1.24%
state/selectors/barStackSelectors.js 45 bytes 2.14kB 2.14%
view changes for bundle: recharts/bundle-treeshaking-cartesian

Assets Changed:

Asset Name Size Change Total Size Change (%)
bundle.js 374 bytes 632.47kB 0.06%

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Staging Deployment Details

These deployments will remain available for 30 days.

To update snapshots: Comment /update-snapshots on this PR to automatically update the baseline screenshots.

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Staging Deployment Details

These deployments will remain available for 30 days.

To update snapshots: Comment /update-snapshots on this PR to automatically update the baseline screenshots.

@PavelVanecek PavelVanecek marked this pull request as ready for review February 23, 2026 11:26
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Walkthrough

Adds bundle visualization and debugging tools for tree-shaking analysis. Introduces a Vite-based React visualization app showing bundle composition, scripts to generate bundle data and trace import paths, and refactors tree-shaking tests to use dynamic group-based expectations instead of hardcoded known issues.

Changes

Cohort / File(s) Summary
Bundle Visualization Application
bundle-viz/... (package.json, tsconfig.json, vite.config.ts, index.html, src/main.tsx, src/App.tsx, src/bundle-data.json), bundle-viz/README.md
New Vite + React + TypeScript application with Treemap and Sunburst views for visualizing module contributions to bundle size. Configures local recharts alias for development, includes dark-themed UI with statistics panel, legend, and empty state handling. App.tsx implements color management, tree processing, and dual-view rendering with ~358 lines of component logic.
Bundle Analysis Scripts
scripts/generate-bundle-data.ts, scripts/trace-bundle.ts
New scripts for bundle analysis: generate-bundle-data.ts builds a hierarchical JSON tree of module sizes from ES6 build output; trace-bundle.ts traces import paths between components using BFS-based path finding with up to 8 shortest paths and depth limit of 25.
Tree-shaking Groups Infrastructure
scripts/treeshaking-groups/*.ts, scripts/treeshaking-groups/index.ts
New centralized declarations of expected bundle contents per component. Replaces hardcoded known issues with 35+ component-specific modules exporting expectedInBundle arrays. Root index exports consolidated treeshakingGroups record mapping components to expected dependencies.
Tree-shaking Core Enhancements
scripts/treeshaking.ts
Enhanced with module graph analysis via getModuleGraph() returning per-module dependency data with rendered sizes. Adds matchComponentNamesInBundle() helper and exports component name constants (CHART_COMPONENT_NAMES, CARTESIAN_COMPONENT_NAMES, POLAR_COMPONENT_NAMES). Implements temporary entry generation and improved bundling pipeline.
Tree-shaking Tests Refactor
scripts/treeshaking.test.ts
Replaces hardcoded known-issue assertions with dynamic expectations from treeshaking-groups. Uses ProjectDocReader for runtime symbol discovery, removes ALL_TRACKED_COMPONENT_NAMES dependency, adds matchComponentNamesInBundle test case. Tests now validate against computed expected sets per component.
Known Issues Removal
scripts/treeshaking-known-issues/*, scripts/treeshaking-known-issues/index.ts
Complete deletion of 35+ files containing hardcoded tree-shaking known issues and their index. Eliminates KnownIssue type and knownTreeshakingIssues array, consolidating expectations into new treeshaking-groups system.
Configuration & Build Updates
.github/workflows/ci.yml, .gitignore, eslint.config.mjs, package.json
CI: adds Node.js setup step in VR Tests job. Gitignore: ignores bundle-viz artifacts and bundle-data files. ESLint: ignores bundle-viz directory. Package.json: adds three new scripts (visualize-bundle, trace-bundle, generate-bundle-data) for on-demand analysis.

Sequence Diagram

sequenceDiagram
    participant User
    participant CLI as generate-bundle-data<br/>Script
    participant Bundler as Rollup<br/>Bundler
    participant Graph as Module<br/>Graph Builder
    participant FileSystem as File<br/>System
    participant VisualizationApp as Bundle Visualization<br/>App
    participant Browser

    User->>CLI: run generate-bundle-data [components]
    CLI->>Bundler: treeshake selected components<br/>with temporary entry
    Bundler->>Graph: emit module metadata
    Graph->>Graph: collect rendered sizes<br/>per module
    Graph-->>Bundler: module graph data
    Bundler-->>CLI: bundled ES module output
    CLI->>CLI: parse output, build hierarchical tree<br/>insert modules, accumulate sizes
    CLI->>CLI: compute totalSize, moduleCount<br/>assign stable colors to groups
    CLI->>FileSystem: write bundle-data.json
    
    User->>VisualizationApp: npm run dev
    VisualizationApp->>FileSystem: load bundle-data.json
    FileSystem-->>VisualizationApp: hierarchical data
    VisualizationApp->>VisualizationApp: render Treemap or Sunburst<br/>apply colors, compute layout
    VisualizationApp-->>Browser: visualize bundle composition<br/>interactive chart + stats
    Browser-->>User: display module sizes,<br/>drill down capabilities
Loading

Estimated code review effort

🎯 4 (Complex) | ⏱️ ~60 minutes

Possibly related PRs

  • #7032: Introduces initial tree-shaking test infrastructure and the scripts/treeshaking.ts module that this PR significantly enhances with module graph APIs and improved bundling logic.
  • #6869: Adds ProjectDocReader which is now used by the refactored treeshaking tests and treeshaking.ts for runtime symbol discovery in the new analysis pipeline.
  • #6729: Modifies component export structure that affects the accuracy of the new ProjectDocReader-based component discovery used throughout the tree-shaking tooling.

Suggested labels

enhancement, documentation, tooling

🚥 Pre-merge checks | ✅ 4 | ❌ 1

❌ Failed checks (1 warning)

Check name Status Explanation Resolution
Docstring Coverage ⚠️ Warning Docstring coverage is 25.00% which is insufficient. The required threshold is 80.00%. Write docstrings for the functions missing them to satisfy the coverage threshold.
✅ Passed checks (4 passed)
Check name Status Explanation
Title check ✅ Passed The title clearly and accurately summarizes the main feature added: an interactive bundle visualization app using Treemap and Sunburst views, which is the primary deliverable of this PR.
Description check ✅ Passed The PR description comprehensively covers all required sections: clear description of changes, related issue reference, motivation, testing details with screenshots, and appropriate type classification. The description is well-structured and provides implementation details.
Linked Issues check ✅ Passed The PR successfully addresses both primary objectives from issue #7036: (1) adds a visualization tool (bundle-viz app with Treemap/Sunburst views) showing file size contribution in kB, and (2) adds a debug trace tool (scripts/trace-bundle.ts) explaining import chains. All coding requirements are met.
Out of Scope Changes check ✅ Passed Changes are appropriately scoped: bundle-viz app and related scripts are developer-only tools, dependencies added are dev-only (TypeScript, Vite, React for visualization), and no changes reach the npm package. Treeshaking test updates support the new tooling. All changes relate to the linked issue objectives.

✏️ Tip: You can configure your own custom pre-merge checks in the settings.

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  • Post copyable unit tests in a comment
  • Commit unit tests in branch copilot/add-bundle-visualization-tool

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Actionable comments posted: 9

🧹 Nitpick comments (8)
.gitignore (1)

37-42: Consider gitignoring bundle-viz/src/bundle-data.json.

scripts/generate-bundle-data.ts writes its output directly to bundle-viz/src/bundle-data.json. Without a gitignore entry, developers who run npm run generate-bundle-data will have that generated file show up as a dirty working tree and could accidentally commit real bundle data alongside a PR. If the intent is to ship only a committed placeholder and treat generated output as local-only, adding the pattern prevents accidental commits.

💡 Proposed addition
 # bundle-viz app: dependencies and build artifacts
 bundle-viz/node_modules
 bundle-viz/dist
+
+# bundle-viz generated data (run `npm run generate-bundle-data` locally)
+bundle-viz/src/bundle-data.json
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.

In @.gitignore around lines 37 - 42, Add the generated
bundle-viz/src/bundle-data.json to .gitignore so running
scripts/generate-bundle-data.ts (which writes that file) doesn't leave a dirty
working tree or risk accidental commits; update the .gitignore by adding the
pattern "bundle-viz/src/bundle-data.json" (or a broader "bundle-viz/src/*.json"
if preferred) alongside the existing bundle-viz entries to ensure generated
bundle data files are ignored.
scripts/treeshaking-groups/BarStack.ts (1)

1-1: Remove orphaned comment.

/** The component being imported */ on Line 1 is not attached to any declaration and has no equivalent in any other treeshaking-groups file. It looks like a leftover template artifact.

🧹 Suggested cleanup
-/** The component being imported */
-
 /**
  * All components expected to appear in the bundle when importing this component.
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.

In `@scripts/treeshaking-groups/BarStack.ts` at line 1, Remove the orphaned
leading JSDoc comment `/** The component being imported */` from the top of
scripts/treeshaking-groups/BarStack.ts; this comment is not attached to any
declaration (no matching symbol like a function/class/variable in BarStack) and
should simply be deleted to clean up the file.
bundle-viz/vite.config.ts (1)

1-20: LGTM — optional: prefer import.meta.url over __dirname for ESM portability.

The difference between __dirname and import.meta.url in Vite configs is that modern Vite projects use ES modules where __dirname isn't natively available. Vite does inject CJS shims when processing its config file so this works today, but the idiomatic ESM-safe alternative avoids the dependency on Vite's shim injection:

♻️ Optional: modern ESM-safe equivalent
-import { resolve } from 'path';
+import { fileURLToPath, URL } from 'node:url';
 
 export default defineConfig({
   resolve: {
     alias: {
-      recharts: resolve(__dirname, '../src'),
+      recharts: fileURLToPath(new URL('../src', import.meta.url)),
     },
   },

Also note that bundle-viz/tsconfig.json maps recharts to ../src/index.ts (explicit file entry) while this config maps to ../src (directory). The manual approach requires you to sync aliases between tsconfig.json and vite.config.ts; if you ever add more aliases, you'll need to update both files. Both resolve identically for import from 'recharts' in practice, but keeping them consistent avoids confusion.

🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.

In `@bundle-viz/vite.config.ts` around lines 1 - 20, Replace the CommonJS
__dirname usage with an ESM-safe import.meta.url-based path for the recharts
alias: change the alias value from resolve(__dirname, '../src') to resolve(new
URL('../src', import.meta.url).pathname) (or derive __dirname via
fileURLToPath(import.meta.url) if you prefer), and ensure this alias remains
consistent with the tsconfig.json mapping for recharts (currently
../src/index.ts) so both configs resolve the same module entry.
scripts/treeshaking-groups/CartesianGrid.ts (1)

1-1: Orphan comment — appears to be a leftover template fragment.

Line 1 (/** The component being imported */) doesn't annotate any declaration. The meaningful documentation is already in the block comment on lines 3–6. Consider removing it.

Proposed fix
-/** The component being imported */
-
 /**
  * All components expected to appear in the bundle when importing this component.
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.

In `@scripts/treeshaking-groups/CartesianGrid.ts` at line 1, Remove the orphan
top-of-file JSDoc comment "/** The component being imported */" which does not
annotate any declaration and duplicates existing documentation for
CartesianGrid; delete that stray comment at the very start of CartesianGrid.ts
so only the meaningful block comment (lines documenting the CartesianGrid
component) remains.
bundle-viz/README.md (1)

40-47: Add a language identifier to the fenced code block.

The markdownlint tool flags this block (MD040). Use ```text for plain directory listings.

Proposed fix
-```
+```text
 bundle-viz/
   package.json        standalone Vite + React app
   vite.config.ts      aliases recharts → ../src so no build step is needed
   src/
     App.tsx           chart components and layout
     main.tsx          React entry point
     bundle-data.json  placeholder shipped in git; overwritten by npm run generate-bundle-data
-```
+```
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.

In `@bundle-viz/README.md` around lines 40 - 47, Markdown linting flags the fenced
code block under the bundle-viz directory listing for missing a language
identifier; edit the README.md section showing the directory tree and change the
opening fence from ``` to ```text (i.e., add the "text" language identifier for
that directory listing block) so the block becomes ```text ... ``` and satisfies
MD040.
scripts/generate-bundle-data.ts (1)

111-111: Consider ensuring the output directory exists before writing.

If bundle-viz/src/ is ever missing (e.g., after a partial clone or clean), this will throw. A one-liner guard would make the script more robust.

Proposed fix
+  fs.mkdirSync(path.dirname(outFile), { recursive: true });
   fs.writeFileSync(outFile, JSON.stringify(bundleData, null, 2), 'utf-8');
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.

In `@scripts/generate-bundle-data.ts` at line 111, The script currently calls
fs.writeFileSync(outFile, ...) which will throw if the target directory (e.g.,
bundle-viz/src/) is missing; before calling fs.writeFileSync, ensure the parent
directory exists by creating it (use the directory from path.dirname(outFile))
with recursive directory creation (e.g., fs.mkdirSync(..., { recursive: true }))
so the write is robust even after a clean/partial clone.
scripts/treeshaking.ts (1)

165-176: Static analysis ReDoS warnings are low-risk here, but escapeRegExp would be a cheap safety net.

The name values originate from ProjectDocReader.getAllRuntimeExportedNames() — valid JS identifiers that cannot contain regex metacharacters. So the ReDoS concern flagged by ast-grep is a false positive in practice. That said, since matchComponentNamesInBundle is a public export, a simple escape (or switching to sourceCode.includes(...) with template strings) would make it defensively safe without a performance cost.

Optional hardening
+function escapeRegExp(s: string): string {
+  return s.replace(/[.*+?^${}()|[\]\\]/g, '\\$&');
+}
+
 export function matchComponentNamesInBundle(sourceCode: string, componentNames: ReadonlyArray<string>): Set<string> {
   return new Set(
     componentNames.filter(name => {
+      const escaped = escapeRegExp(name);
       return (
-        new RegExp(`var ${name} `).test(sourceCode) ||
-        new RegExp(`const ${name} `).test(sourceCode) ||
-        new RegExp(`function ${name}\\(`).test(sourceCode) ||
-        new RegExp(`class ${name}\\s+{`).test(sourceCode)
+        new RegExp(`var ${escaped} `).test(sourceCode) ||
+        new RegExp(`const ${escaped} `).test(sourceCode) ||
+        new RegExp(`function ${escaped}\\(`).test(sourceCode) ||
+        new RegExp(`class ${escaped}\\s+{`).test(sourceCode)
       );
     }),
   );
 }
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.

In `@scripts/treeshaking.ts` around lines 165 - 176, matchComponentNamesInBundle
builds RegExp objects from unescaped component names which triggers static ReDoS
warnings; defensively escape the identifier before constructing the RegExp (or
replace the RegExp checks with simple string checks using sourceCode.includes
for patterns like `var ${name} `, `const ${name} `, `function ${name}(` and
`class ${name} `). Update matchComponentNamesInBundle to call a small escape
function (e.g. escapeRegExp) on the name or switch each test to
sourceCode.includes so inputs from ProjectDocReader.getAllRuntimeExportedNames
are safely handled and the ast-grep warning is eliminated.
scripts/trace-bundle.ts (1)

50-82: BFS can explore exponentially many paths on dense graphs.

The search clones and enqueues a new path array for every edge and only prunes cycles within a single path (line 75). On a heavily interconnected module graph this could cause the queue to grow very large before hitting maxResults. For a dev tool this is likely acceptable given MAX_DEPTH = 25 and maxResults = 8, but if performance is ever an issue, consider a level-limited BFS with a global visited set for single-shortest-path, then re-running with relaxed constraints for alternate paths.

🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.

In `@scripts/trace-bundle.ts` around lines 50 - 82, findShortestPaths currently
clones and enqueues a full path for every edge which can explode on dense
graphs; instead implement a two-phase approach inside findShortestPaths: (1) do
a level-limited BFS using a global visited/distance map (use MAX_DEPTH and stop
when endId is discovered) to compute shortest distance(s) from startId to every
node without storing whole paths, and (2) perform a bounded backtracking/DFS
from startId that uses the distance map to only follow edges that lead closer to
endId and collect up to maxResults paths (this avoids enqueuing every
intermediate path and reduces queue growth caused by pushing [...currentPath,
next] for each importedId). Use the existing names nodeById, queue/MAX_DEPTH,
node.importedIds and maxResults to locate where to change logic.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.

Inline comments:
In `@bundle-viz/src/App.tsx`:
- Around line 137-140: The formatTooltip function accepts Array<number|string>
but currently calls Number(value) which yields NaN for arrays; update
formatTooltip to detect when value is an array (Array.isArray(value)), extract a
sensible numeric candidate (e.g., value[0]) or find the first element that
converts to a finite number, coerce that to Number, and fall back to 0 (or a
safe default) if conversion fails, then use that numeric value for the existing
(num/1024).toFixed(2) kB formatting so Treemap/Sunburst and other callers are
protected from NaN.
- Around line 70-84: CustomTreemapCell is currently deriving fill from COLORS
using index, so cell colors won't match the directory-based legend produced by
colorize()/groupColor; update CustomTreemapCell to accept and use the injected
fill prop instead of re-deriving by index: add fill?: string to the props
signature (or read props.fill), then compute const fill = props.fill ??
COLORS[index % COLORS.length] ?? COLORS[0] (so existing behavior remains as a
fallback), and remove the unconditional COLORS[index % COLORS.length] usage;
this ensures the treemap uses the fill produced by colorize() and matches
Legend/groupColor.

In `@bundle-viz/src/bundle-data.json`:
- Around line 1052-1067: The bundle tree includes a temp Rollup entry because
generate-bundle-data.ts doesn't exclude modules located in the OS temp dir,
causing an empty top-level name; update the module-filtering logic in
generate-bundle-data.ts (the place that iterates over the modules/modulesList
and builds the children tree, e.g., where modules are reduced/converted into a
tree) to skip any module whose resolved path startsWith(os.tmpdir()) or whose
top-level directory name is empty (e.g., path.split(path.sep)[0] === ''), so
these temporary entry files are filtered out before constructing the children
array.

In `@package.json`:
- Line 51: The package.json contains a broken npm script "visualize-bundle"
referencing a non-existent scripts/visualize-bundle.ts; remove the
"visualize-bundle" entry entirely or replace its value to point to the correct
tool (for example run the bundle-viz app) so the scripts section only references
existing commands like "trace-bundle" and "generate-bundle-data" and/or a valid
bundle-viz invocation; update the "visualize-bundle" key accordingly or delete
the key to prevent runtime failures.

In `@scripts/treeshaking-groups/Tooltip.ts`:
- Around line 1-12: The exported array expectedInBundle is currently typed as
mutable string[]; make it a readonly literal tuple by appending "as const" to
the array literal so downstream code that reads the exact literal types (e.g.,
the consumer in index.ts) gets the correct types; update the declaration of
expectedInBundle to close the array with "as const" to match other
treeshaking-groups files.

In `@scripts/treeshaking-groups/XAxis.ts`:
- Around line 1-2: Remove the dangling JSDoc comment `/** The component being
imported */` at the top of XAxis.ts since the annotated symbol (`component =
'XAxis' as const`) was removed; simply delete this orphaned comment so the file
no longer contains misleading leftover documentation.

In `@scripts/treeshaking-groups/YAxis.ts`:
- Around line 1-6: Remove the orphaned top-level JSDoc that references the
removed "component" export and update the comment above the expectedInBundle
array in YAxis.ts to remove or rephrase the misleading "unexpectedly" phrasing
about CartesianAxis (or delete the explanatory sentence entirely); locate the
comment that references expectedInBundle and CartesianAxis and either make it a
factual description of what is included in expectedInBundle or delete the
outdated explanation so the file only documents the current expectedInBundle
contents.

In `@scripts/treeshaking-groups/ZAxis.ts`:
- Line 1: The expectedInBundle array in ZAxis.ts is missing the component name;
update the exported constant expectedInBundle (in ZAxis.ts) to include the
string 'ZAxis' alongside 'getNiceTickValues' so it matches the pattern used by
other treeshaking-groups files (i.e., include 'ZAxis' in the tuple returned by
expectedInBundle).

In `@scripts/treeshaking.test.ts`:
- Line 33: The test uses Set.prototype.symmetricDifference
(allBundledComponents.symmetricDifference(knownExpectedBundle)) which requires
Node ≥22; change to a Node 18-compatible approach by replacing that call:
compute items present in allBundledComponents but not in knownExpectedBundle and
items present in knownExpectedBundle but not in allBundledComponents, then join
those two lists; update the `Importing ${componentName}... Diff: [...]`
expression to use this computed concatenation instead, or alternatively update
the package.json `engines.node` to ">=22" if you prefer to require a newer Node
version. Ensure you reference the same variables: allBundledComponents and
knownExpectedBundle and produce the same string format as before.

---

Nitpick comments:
In @.gitignore:
- Around line 37-42: Add the generated bundle-viz/src/bundle-data.json to
.gitignore so running scripts/generate-bundle-data.ts (which writes that file)
doesn't leave a dirty working tree or risk accidental commits; update the
.gitignore by adding the pattern "bundle-viz/src/bundle-data.json" (or a broader
"bundle-viz/src/*.json" if preferred) alongside the existing bundle-viz entries
to ensure generated bundle data files are ignored.

In `@bundle-viz/README.md`:
- Around line 40-47: Markdown linting flags the fenced code block under the
bundle-viz directory listing for missing a language identifier; edit the
README.md section showing the directory tree and change the opening fence from
``` to ```text (i.e., add the "text" language identifier for that directory
listing block) so the block becomes ```text ... ``` and satisfies MD040.

In `@bundle-viz/vite.config.ts`:
- Around line 1-20: Replace the CommonJS __dirname usage with an ESM-safe
import.meta.url-based path for the recharts alias: change the alias value from
resolve(__dirname, '../src') to resolve(new URL('../src',
import.meta.url).pathname) (or derive __dirname via
fileURLToPath(import.meta.url) if you prefer), and ensure this alias remains
consistent with the tsconfig.json mapping for recharts (currently
../src/index.ts) so both configs resolve the same module entry.

In `@scripts/generate-bundle-data.ts`:
- Line 111: The script currently calls fs.writeFileSync(outFile, ...) which will
throw if the target directory (e.g., bundle-viz/src/) is missing; before calling
fs.writeFileSync, ensure the parent directory exists by creating it (use the
directory from path.dirname(outFile)) with recursive directory creation (e.g.,
fs.mkdirSync(..., { recursive: true })) so the write is robust even after a
clean/partial clone.

In `@scripts/trace-bundle.ts`:
- Around line 50-82: findShortestPaths currently clones and enqueues a full path
for every edge which can explode on dense graphs; instead implement a two-phase
approach inside findShortestPaths: (1) do a level-limited BFS using a global
visited/distance map (use MAX_DEPTH and stop when endId is discovered) to
compute shortest distance(s) from startId to every node without storing whole
paths, and (2) perform a bounded backtracking/DFS from startId that uses the
distance map to only follow edges that lead closer to endId and collect up to
maxResults paths (this avoids enqueuing every intermediate path and reduces
queue growth caused by pushing [...currentPath, next] for each importedId). Use
the existing names nodeById, queue/MAX_DEPTH, node.importedIds and maxResults to
locate where to change logic.

In `@scripts/treeshaking-groups/BarStack.ts`:
- Line 1: Remove the orphaned leading JSDoc comment `/** The component being
imported */` from the top of scripts/treeshaking-groups/BarStack.ts; this
comment is not attached to any declaration (no matching symbol like a
function/class/variable in BarStack) and should simply be deleted to clean up
the file.

In `@scripts/treeshaking-groups/CartesianGrid.ts`:
- Line 1: Remove the orphan top-of-file JSDoc comment "/** The component being
imported */" which does not annotate any declaration and duplicates existing
documentation for CartesianGrid; delete that stray comment at the very start of
CartesianGrid.ts so only the meaningful block comment (lines documenting the
CartesianGrid component) remains.

In `@scripts/treeshaking.ts`:
- Around line 165-176: matchComponentNamesInBundle builds RegExp objects from
unescaped component names which triggers static ReDoS warnings; defensively
escape the identifier before constructing the RegExp (or replace the RegExp
checks with simple string checks using sourceCode.includes for patterns like
`var ${name} `, `const ${name} `, `function ${name}(` and `class ${name} `).
Update matchComponentNamesInBundle to call a small escape function (e.g.
escapeRegExp) on the name or switch each test to sourceCode.includes so inputs
from ProjectDocReader.getAllRuntimeExportedNames are safely handled and the
ast-grep warning is eliminated.

ℹ️ Review info

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 15b5407 and cc33753.

⛔ Files ignored due to path filters (1)
  • bundle-viz/package-lock.json is excluded by !**/package-lock.json
📒 Files selected for processing (86)
  • .github/workflows/ci.yml
  • .gitignore
  • bundle-viz/README.md
  • bundle-viz/index.html
  • bundle-viz/package.json
  • bundle-viz/src/App.tsx
  • bundle-viz/src/bundle-data.json
  • bundle-viz/src/main.tsx
  • bundle-viz/tsconfig.json
  • bundle-viz/vite.config.ts
  • eslint.config.mjs
  • package.json
  • scripts/generate-bundle-data.ts
  • scripts/trace-bundle.ts
  • scripts/treeshaking-groups/Area.ts
  • scripts/treeshaking-groups/AreaChart.ts
  • scripts/treeshaking-groups/Bar.ts
  • scripts/treeshaking-groups/BarChart.ts
  • scripts/treeshaking-groups/BarStack.ts
  • scripts/treeshaking-groups/Brush.ts
  • scripts/treeshaking-groups/CartesianAxis.ts
  • scripts/treeshaking-groups/CartesianGrid.ts
  • scripts/treeshaking-groups/ComposedChart.ts
  • scripts/treeshaking-groups/Customized.ts
  • scripts/treeshaking-groups/ErrorBar.ts
  • scripts/treeshaking-groups/Funnel.ts
  • scripts/treeshaking-groups/FunnelChart.ts
  • scripts/treeshaking-groups/Line.ts
  • scripts/treeshaking-groups/LineChart.ts
  • scripts/treeshaking-groups/Pie.ts
  • scripts/treeshaking-groups/PieChart.ts
  • scripts/treeshaking-groups/PolarAngleAxis.ts
  • scripts/treeshaking-groups/PolarGrid.ts
  • scripts/treeshaking-groups/PolarRadiusAxis.ts
  • scripts/treeshaking-groups/Radar.ts
  • scripts/treeshaking-groups/RadarChart.ts
  • scripts/treeshaking-groups/RadialBar.ts
  • scripts/treeshaking-groups/RadialBarChart.ts
  • scripts/treeshaking-groups/ReferenceArea.ts
  • scripts/treeshaking-groups/ReferenceDot.ts
  • scripts/treeshaking-groups/ReferenceLine.ts
  • scripts/treeshaking-groups/Sankey.ts
  • scripts/treeshaking-groups/Scatter.ts
  • scripts/treeshaking-groups/ScatterChart.ts
  • scripts/treeshaking-groups/SunburstChart.ts
  • scripts/treeshaking-groups/Tooltip.ts
  • scripts/treeshaking-groups/Treemap.ts
  • scripts/treeshaking-groups/XAxis.ts
  • scripts/treeshaking-groups/YAxis.ts
  • scripts/treeshaking-groups/ZAxis.ts
  • scripts/treeshaking-groups/index.ts
  • scripts/treeshaking-known-issues/Area.ts
  • scripts/treeshaking-known-issues/AreaChart.ts
  • scripts/treeshaking-known-issues/Bar.ts
  • scripts/treeshaking-known-issues/BarChart.ts
  • scripts/treeshaking-known-issues/BarStack.ts
  • scripts/treeshaking-known-issues/Brush.ts
  • scripts/treeshaking-known-issues/CartesianAxis.ts
  • scripts/treeshaking-known-issues/CartesianGrid.ts
  • scripts/treeshaking-known-issues/ComposedChart.ts
  • scripts/treeshaking-known-issues/ErrorBar.ts
  • scripts/treeshaking-known-issues/Funnel.ts
  • scripts/treeshaking-known-issues/FunnelChart.ts
  • scripts/treeshaking-known-issues/Line.ts
  • scripts/treeshaking-known-issues/LineChart.ts
  • scripts/treeshaking-known-issues/Pie.ts
  • scripts/treeshaking-known-issues/PieChart.ts
  • scripts/treeshaking-known-issues/PolarAngleAxis.ts
  • scripts/treeshaking-known-issues/PolarGrid.ts
  • scripts/treeshaking-known-issues/PolarRadiusAxis.ts
  • scripts/treeshaking-known-issues/Radar.ts
  • scripts/treeshaking-known-issues/RadarChart.ts
  • scripts/treeshaking-known-issues/RadialBar.ts
  • scripts/treeshaking-known-issues/RadialBarChart.ts
  • scripts/treeshaking-known-issues/ReferenceArea.ts
  • scripts/treeshaking-known-issues/ReferenceDot.ts
  • scripts/treeshaking-known-issues/ReferenceLine.ts
  • scripts/treeshaking-known-issues/Sankey.ts
  • scripts/treeshaking-known-issues/Scatter.ts
  • scripts/treeshaking-known-issues/ScatterChart.ts
  • scripts/treeshaking-known-issues/SunburstChart.ts
  • scripts/treeshaking-known-issues/Treemap.ts
  • scripts/treeshaking-known-issues/ZAxis.ts
  • scripts/treeshaking-known-issues/index.ts
  • scripts/treeshaking.test.ts
  • scripts/treeshaking.ts
💤 Files with no reviewable changes (33)
  • scripts/treeshaking-known-issues/RadarChart.ts
  • scripts/treeshaking-known-issues/Funnel.ts
  • scripts/treeshaking-known-issues/PolarAngleAxis.ts
  • scripts/treeshaking-known-issues/ComposedChart.ts
  • scripts/treeshaking-known-issues/BarChart.ts
  • scripts/treeshaking-known-issues/PolarRadiusAxis.ts
  • scripts/treeshaking-known-issues/Bar.ts
  • scripts/treeshaking-known-issues/ZAxis.ts
  • scripts/treeshaking-known-issues/SunburstChart.ts
  • scripts/treeshaking-known-issues/ErrorBar.ts
  • scripts/treeshaking-known-issues/Sankey.ts
  • scripts/treeshaking-known-issues/LineChart.ts
  • scripts/treeshaking-known-issues/ScatterChart.ts
  • scripts/treeshaking-known-issues/ReferenceLine.ts
  • scripts/treeshaking-known-issues/RadialBar.ts
  • scripts/treeshaking-known-issues/CartesianAxis.ts
  • scripts/treeshaking-known-issues/Brush.ts
  • scripts/treeshaking-known-issues/Treemap.ts
  • scripts/treeshaking-known-issues/Pie.ts
  • scripts/treeshaking-known-issues/BarStack.ts
  • scripts/treeshaking-known-issues/CartesianGrid.ts
  • scripts/treeshaking-known-issues/Area.ts
  • scripts/treeshaking-known-issues/RadialBarChart.ts
  • scripts/treeshaking-known-issues/ReferenceDot.ts
  • scripts/treeshaking-known-issues/FunnelChart.ts
  • scripts/treeshaking-known-issues/Radar.ts
  • scripts/treeshaking-known-issues/AreaChart.ts
  • scripts/treeshaking-known-issues/index.ts
  • scripts/treeshaking-known-issues/ReferenceArea.ts
  • scripts/treeshaking-known-issues/PieChart.ts
  • scripts/treeshaking-known-issues/PolarGrid.ts
  • scripts/treeshaking-known-issues/Line.ts
  • scripts/treeshaking-known-issues/Scatter.ts

Comment on lines +70 to +84
const COLORS = PALETTE;

function CustomTreemapCell(props: {
x?: number;
y?: number;
width?: number;
height?: number;
index?: number;
name?: string;
value?: number;
depth?: number;
root?: TreemapNode;
}) {
const { x = 0, y = 0, width = 0, height = 0, index = 0, name, value, depth = 0 } = props;
const fill = COLORS[index % COLORS.length] ?? COLORS[0];
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⚠️ Potential issue | 🟠 Major

Treemap cell colors won't match the directory-based legend.

CustomTreemapCell uses COLORS[index % COLORS.length] (line 84), which colors cells by their render index — not by their top-level directory group. Meanwhile, colorize() carefully propagates a fill prop through the tree, and the Legend component displays directory-based colors from groupColor. The treemap cells will not visually correspond to the legend.

Use the fill prop that colorize() already injects instead of re-deriving from index:

Proposed fix
 function CustomTreemapCell(props: {
   x?: number;
   y?: number;
   width?: number;
   height?: number;
   index?: number;
+  fill?: string;
   name?: string;
   value?: number;
   depth?: number;
   root?: TreemapNode;
 }) {
-  const { x = 0, y = 0, width = 0, height = 0, index = 0, name, value, depth = 0 } = props;
-  const fill = COLORS[index % COLORS.length] ?? COLORS[0];
+  const { x = 0, y = 0, width = 0, height = 0, name, value, depth = 0, fill: nodeFill } = props;
+  const fill = nodeFill ?? PALETTE[0];
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
const COLORS = PALETTE;
function CustomTreemapCell(props: {
x?: number;
y?: number;
width?: number;
height?: number;
index?: number;
name?: string;
value?: number;
depth?: number;
root?: TreemapNode;
}) {
const { x = 0, y = 0, width = 0, height = 0, index = 0, name, value, depth = 0 } = props;
const fill = COLORS[index % COLORS.length] ?? COLORS[0];
const COLORS = PALETTE;
function CustomTreemapCell(props: {
x?: number;
y?: number;
width?: number;
height?: number;
index?: number;
fill?: string;
name?: string;
value?: number;
depth?: number;
root?: TreemapNode;
}) {
const { x = 0, y = 0, width = 0, height = 0, name, value, depth = 0, fill: nodeFill } = props;
const fill = nodeFill ?? PALETTE[0];
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.

In `@bundle-viz/src/App.tsx` around lines 70 - 84, CustomTreemapCell is currently
deriving fill from COLORS using index, so cell colors won't match the
directory-based legend produced by colorize()/groupColor; update
CustomTreemapCell to accept and use the injected fill prop instead of
re-deriving by index: add fill?: string to the props signature (or read
props.fill), then compute const fill = props.fill ?? COLORS[index %
COLORS.length] ?? COLORS[0] (so existing behavior remains as a fallback), and
remove the unconditional COLORS[index % COLORS.length] usage; this ensures the
treemap uses the fill produced by colorize() and matches Legend/groupColor.

Comment on lines +137 to +140
function formatTooltip(value: number | string | Array<number | string>) {
const num = typeof value === 'number' ? value : Number(value);
return [`${(num / 1024).toFixed(2)} kB`, 'Size'];
}
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⚠️ Potential issue | 🟡 Minor

formatTooltip doesn't handle the Array case gracefully.

When value is an Array, Number(value) produces NaN. Although in practice Treemap/Sunburst should pass a single number, the type signature explicitly accepts arrays. A quick guard would be safer:

Proposed fix
 function formatTooltip(value: number | string | Array<number | string>) {
-  const num = typeof value === 'number' ? value : Number(value);
+  const num = typeof value === 'number' ? value : Number(Array.isArray(value) ? value[0] : value);
   return [`${(num / 1024).toFixed(2)} kB`, 'Size'];
 }
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
function formatTooltip(value: number | string | Array<number | string>) {
const num = typeof value === 'number' ? value : Number(value);
return [`${(num / 1024).toFixed(2)} kB`, 'Size'];
}
function formatTooltip(value: number | string | Array<number | string>) {
const num = typeof value === 'number' ? value : Number(Array.isArray(value) ? value[0] : value);
return [`${(num / 1024).toFixed(2)} kB`, 'Size'];
}
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.

In `@bundle-viz/src/App.tsx` around lines 137 - 140, The formatTooltip function
accepts Array<number|string> but currently calls Number(value) which yields NaN
for arrays; update formatTooltip to detect when value is an array
(Array.isArray(value)), extract a sensible numeric candidate (e.g., value[0]) or
find the first element that converts to a finite number, coerce that to Number,
and fall back to 0 (or a safe default) if conversion fails, then use that
numeric value for the existing (num/1024).toFixed(2) kB formatting so
Treemap/Sunburst and other callers are protected from NaN.

Comment on lines +1052 to +1067
{
"name": "",
"value": 383,
"children": [
{
"name": "tmp",
"value": 383,
"children": [
{
"name": "recharts-treeshake-entry-1771721895525-5vydbzhsc34.mjs",
"value": 383
}
]
}
]
}
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⚠️ Potential issue | 🟡 Minor

Temp-file artifact leaking into the bundle tree

The entry at lines 1052–1067 has "name": "" and wraps a /tmp/recharts-treeshake-entry-…mjs node — this is the Rollup entry file created on disk by scripts/generate-bundle-data.ts during tree-shaking analysis. It leaks into the output because its resolved path falls outside the recharts source tree, producing an empty-string directory key.

It surfaces in both Treemap and Sunburst views as an unlabeled cell. The fix belongs in generate-bundle-data.ts: filter out modules whose resolved path starts with the OS temp directory (or whose top-level directory name is empty) before constructing the children tree.

🐛 Suggested filter in `generate-bundle-data.ts`
- // group modules by first path segment
+ // group modules by first path segment, skipping tmp/external artifacts
  for (const [id, size] of moduleEntries) {
+   const rel = path.relative(srcRoot, id);
+   if (rel.startsWith('..') || path.isAbsolute(rel)) continue; // outside src root
    const parts = rel.split(path.sep);
    // …existing grouping logic
  }
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.

In `@bundle-viz/src/bundle-data.json` around lines 1052 - 1067, The bundle tree
includes a temp Rollup entry because generate-bundle-data.ts doesn't exclude
modules located in the OS temp dir, causing an empty top-level name; update the
module-filtering logic in generate-bundle-data.ts (the place that iterates over
the modules/modulesList and builds the children tree, e.g., where modules are
reduced/converted into a tree) to skip any module whose resolved path
startsWith(os.tmpdir()) or whose top-level directory name is empty (e.g.,
path.split(path.sep)[0] === ''), so these temporary entry files are filtered out
before constructing the children array.

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I will replace this whole app in next PR

Comment on lines +1 to +12
export const expectedInBundle = [
'Cross',
'Curve',
'DefaultTooltipContent',
'DefaultZIndexes',
'getNiceTickValues',
'Global',
'Rectangle',
'Sector',
'Tooltip',
'ZIndexLayer',
];
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⚠️ Potential issue | 🟡 Minor

as const is missing — type is inferred as string[] instead of a readonly literal tuple.

Every other treeshaking-groups/*.ts file closes the array with ] as const;. Without it, expectedInBundle has type string[] — mutable and lacking the literal element types that the consuming code in index.ts relies on. This is an inconsistency that can produce subtle type errors downstream.

🐛 Proposed fix
 export const expectedInBundle = [
   'Cross',
   'Curve',
   'DefaultTooltipContent',
   'DefaultZIndexes',
   'getNiceTickValues',
   'Global',
   'Rectangle',
   'Sector',
   'Tooltip',
   'ZIndexLayer',
-];
+] as const;
📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change
export const expectedInBundle = [
'Cross',
'Curve',
'DefaultTooltipContent',
'DefaultZIndexes',
'getNiceTickValues',
'Global',
'Rectangle',
'Sector',
'Tooltip',
'ZIndexLayer',
];
export const expectedInBundle = [
'Cross',
'Curve',
'DefaultTooltipContent',
'DefaultZIndexes',
'getNiceTickValues',
'Global',
'Rectangle',
'Sector',
'Tooltip',
'ZIndexLayer',
] as const;
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.

In `@scripts/treeshaking-groups/Tooltip.ts` around lines 1 - 12, The exported
array expectedInBundle is currently typed as mutable string[]; make it a
readonly literal tuple by appending "as const" to the array literal so
downstream code that reads the exact literal types (e.g., the consumer in
index.ts) gets the correct types; update the declaration of expectedInBundle to
close the array with "as const" to match other treeshaking-groups files.

@PavelVanecek PavelVanecek merged commit faeffe1 into main Feb 23, 2026
46 of 48 checks passed
@PavelVanecek PavelVanecek deleted the copilot/add-bundle-visualization-tool branch February 23, 2026 12:44
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Bundle size visualization

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