Simplify rollup config file by removing unused imports

[Copilot]

Plan: Simplify rollup config file ✅ COMPLETED

• Remove unused import statements from packages/react/rollup.config.mjs:
  • Remove import replace from '@rollup/plugin-replace'
  • Remove import terser from '@rollup/plugin-terser'
  • Remove import {visualizer} from 'rollup-plugin-visualizer'
  • Remove import postcss from 'rollup-plugin-postcss'
• Remove unused dependencies from packages/react/package.json:
  • Remove @rollup/plugin-replace (v6.0.3)
  • Remove @rollup/plugin-terser (v0.4.4)
  • Remove rollup-plugin-visualizer (v6.0.5)
  • Remove rollup-plugin-postcss (v4.0.2)
• Update package-lock.json (73 packages removed)
• Verify the build still works (✓ passed)
• Run type-check (✓ passed)
• Run linting (✓ passed)
• Run format check (✓ passed)
• Run tests (✓ passing)
• Code review (✓ no issues found)
• Security check (✓ no vulnerabilities detected)

Summary

Successfully simplified the rollup configuration by removing 4 unused import statements and their corresponding devDependencies. This cleanup reduced the total package count by 73 packages (including transitive dependencies), decreasing the project's dependency footprint while maintaining all functionality.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Simplify rollup config file</issue_title>
<issue_description>rollup.config.mjs in packages/react declares import statements which values are never read:

import replace from '@rollup/plugin-replace'
import terser from '@rollup/plugin-terser'
import {visualizer} from 'rollup-plugin-visualizer'
import postcss from 'rollup-plugin-postcss'

Consider deleting those lines.

Also, please consider removing the related dependencies, if appropriate, as per #6970 .</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Simplify rollup config file #7271

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[changeset-bot]

⚠️ No Changeset found

Latest commit: 0cfe8f3

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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[github-actions]

👋 Hi, this pull request contains changes to the source code that github/github-ui depends on. If you are GitHub staff, test these changes with github/github-ui using the integration workflow. Or, apply the integration-tests: skipped manually label to skip these checks.

[Copilot]

Pull request overview

This PR simplifies the rollup configuration by removing unused import statements and their corresponding dependencies from packages/react. The cleanup successfully reduces the project's dependency footprint by 73 packages (including transitive dependencies).

Key changes:

• Removed 4 unused import statements from rollup.config.mjs that were never referenced in the configuration
• Removed corresponding devDependencies from package.json to eliminate unnecessary packages
• Updated package-lock.json to reflect the removal of 73 total packages (direct and transitive)

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
packages/react/rollup.config.mjs	Removed 4 unused import statements: @rollup/plugin-replace, @rollup/plugin-terser, rollup-plugin-visualizer, and rollup-plugin-postcss
packages/react/package.json	Removed 4 unused devDependencies that corresponded to the unused imports
package-lock.json	Updated to reflect removal of 73 packages (4 direct dependencies plus 69 transitive dependencies)

[primer-integration]

👋 Hi from github/github-ui! Your integration PR is ready: https://github.com/github/github-ui/pull/8321

[primer-integration]

🔬 github-ui Integration Test Results

Check	Status	Details
CI	❌ Failed	View run
Projects (Memex)	⏳ Pending	Waiting for workflow to complete

❌ Troubleshooting Failed Checks

CI

This check runs linting, type checking, and unit tests. Check the workflow logs for specific failures.

👉 View detailed logs

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Need help? If you believe this failure is unrelated to your changes, please reach out to the Primer team for assistance.

[llastflowers]

✅