rspack-best-practices: Workflow Automation for AI Agents | OpenAgentSkill

Overview

Rspack best practices for config, CLI workflow, type checking, CSS, bundle optimization, assets and profiling. Use when writing, reviewing, or troubleshooting Rspack projects.

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Rspack Best Practices

Apply these rules when writing or reviewing Rspack projects.

Configuration

Use rspack.config.ts and defineConfig
Define explicit entry values for multi-page applications
Keep one main config and branch by process.env.NODE_ENV only when needed
Keep rule conditions narrow and explicit (test, include, exclude, resourceQuery)
Prefer built-in Rspack plugins/loaders over community JS alternatives when equivalent features exist

CLI

If @rspack/cli is installed:

Use rspack dev for local development
Use rspack build for production build
Use rspack preview only for local production preview

Type checking

Use ts-checker-rspack-plugin for integrated dev/build type checks
Or run tsc --noEmit/vue-tsc --noEmit as an explicit script step

CSS

Choose one strategy:

Built-in CSS (type: 'css' | 'css/auto' | 'css/module') for modern setups
css-loader + CssExtractRspackPlugin for webpack migration compatibility
style-loader for pure style-in-JS runtime injection scenarios

Optional:

Use builtin:lightningcss-loader when goals are syntax downgrade + vendor prefixing
Use sass-loader/less-loader for preprocessing Sass/Less files
Use @tailwindcss/webpack for Tailwind CSS integration

Bundle size optimization

Prefer dynamic import() for non-critical code paths
Prefer lightweight libraries where possible
Keep target aligned with real compatibility requirements

Asset management

Import source-managed assets from project source directories, not from public
Reference public files by absolute URL path
Prefer asset modules (asset, asset/resource, asset/inline, asset/source) over legacy file-loader/url-loader/raw-loader

Profiling

Use Node CPU profiling (--cpu-prof) when JavaScript-side overhead is suspected
Use RSPACK_PROFILE=OVERVIEW and analyze trace output for compiler-phase bottlenecks
Replace known slow stacks first (babel-loader, PostCSS, terser) with Rspack built-ins when feasible

Security

Do not publish .map files to public servers/CDNs when production source maps are enabled

Documentation

For the latest (v2) docs, read http://rspack.rs/llms.txt
For Rspack v1 docs, read http://v1.rspack.rs/llms.txt

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File metadata

name: rspack-best-practices
description: Rspack best practices for config, CLI workflow, type checking, CSS, bundle optimization, assets and profiling. Use when writing, reviewing, or troubleshooting Rspack projects.

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---
name: rspack-best-practices
description: Rspack best practices for config, CLI workflow, type checking, CSS, bundle optimization, assets and profiling. Use when writing, reviewing, or troubleshooting Rspack projects.
---

# Rspack Best Practices

Apply these rules when writing or reviewing Rspack projects.

## Configuration

- Use `rspack.config.ts` and `defineConfig`
- Define explicit `entry` values for multi-page applications
- Keep one main config and branch by `process.env.NODE_ENV` only when needed
- Keep rule conditions narrow and explicit (`test`, `include`, `exclude`, `resourceQuery`)
- Prefer built-in Rspack plugins/loaders over community JS alternatives when equivalent features exist

## CLI

If `@rspack/cli` is installed:

- Use `rspack dev` for local development
- Use `rspack build` for production build
- Use `rspack preview` only for local production preview

## Type checking

- Use `ts-checker-rspack-plugin` for integrated dev/build type checks
- Or run `tsc --noEmit`/`vue-tsc --noEmit` as an explicit script step

## CSS

Choose one strategy:

- Built-in CSS (`type: 'css' | 'css/auto' | 'css/module'`) for modern setups
- `css-loader` + `CssExtractRspackPlugin` for webpack migration compatibility
- `style-loader` for pure style-in-JS runtime injection scenarios

Optional:

- Use `builtin:lightningcss-loader` when goals are syntax downgrade + vendor prefixing
- Use `sass-loader`/`less-loader` for preprocessing Sass/Less files
- Use `@tailwindcss/webpack` for Tailwind CSS integration

## Bundle size optimization

- Prefer dynamic `import()` for non-critical code paths
- Prefer lightweight libraries where possible
- Keep `target` aligned with real compatibility requirements

## Asset management

- Import source-managed assets from project source directories, not from `public`
- Reference `public` files by absolute URL path
- Prefer asset modules (`asset`, `asset/resource`, `asset/inline`, `asset/source`) over legacy `file-loader`/`url-loader`/`raw-loader`

## Profiling

- Use Node CPU profiling (`--cpu-prof`) when JavaScript-side overhead is suspected
- Use `RSPACK_PROFILE=OVERVIEW` and analyze trace output for compiler-phase bottlenecks
- Replace known slow stacks first (`babel-loader`, PostCSS, terser) with Rspack built-ins when feasible

## Security

- Do not publish `.map` files to public servers/CDNs when production source maps are enabled

## Documentation

- For the latest (v2) docs, read http://rspack.rs/llms.txt
- For Rspack v1 docs, read http://v1.rspack.rs/llms.txt

Review the source

Skill source recorded

Skill instructions are recorded. This is not a runtime test, safety guarantee or compatibility certification.

Review before install: Avoid automatic install

License: MIT

Dependency or permission surface needs review
Permission surface may require sandboxing
SKILL.md lacks explicit setup instructions or prerequisites for using the skill.
No clear workflow or step-by-step process; it is a list of best practices rather than an actionable procedure.
No stated limitations or edge cases where the advice might not apply.
Quality score needs review
Permission surface needs review: secrets or environment access, shell or command execution
GitHub adoption: 93 GitHub stars
Stars/forks activity: 93 stars, 4 forks; issue activity unavailable in current metadata
Dependency/runtime risk: command execution surface, credential or environment access
Permission surface: secrets or environment access, shell or command execution

Open full audit

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Source & usage notes

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Repository metadata and review signals are advisory. Popularity, source discovery and successful execution are different facts.

Source repository: rstackjs/agent-skills
License: MIT
Version: 1.0.0
Last GitHub push: Sep 4, 2026
Registry updated: Sep 7, 2026
Instruction path: skills/rspack-best-practices/SKILL.md @ 9032c74a72ad

Version reported in registry metadata; check source releases before relying on it.

Quality

66/100

Promising

Trust

52/100

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More details

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Source: rstackjs/agent-skills
Indexed by: OpenAgentSkill community index

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