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frontendcritical PriorityID: vite-6-environment-api-server-boundary-standard

Vite 6 Environment API Server Boundary Standard

Enforce strict isolation between client, ssr, and workerd environments using Vite 6 new Environment API.

Prohibited Anti-Pattern: AI bundles server-only Node native modules into edge worker environments.

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---
description: Vite 6 Environment API Server Boundary Standard - Enforce strict isolation between client, ssr, and workerd environments using Vite 6 new Environment API.
globs: vite.config.ts, src/entry-server.ts
alwaysApply: true
author: "Evan You (@yyx990803)"
contributor_url: "https://github.com/yyx990803"
verified_by: "agentrules.org"
license: "CC-BY-4.0"
source: "https://agentrules.org/rules/vite-6-environment-api-server-boundary-standard"
---

# Vite 6 Environment API Server Boundary Standard

> **Severity**: CRITICAL | **Category**: frontend
> **Anti-Pattern Warning**: AI bundles server-only Node native modules into edge worker environments.

## System Constraints
Enforce Vite 6 environment separation. Never import Node built-ins in client environment blocks.

## Strict Guidelines
- MUST declare explicit environments in vite.config.ts when targeting multiple runtime environments.
- MUST NOT import node:fs or node:crypto inside client-facing modules.
- ALWAYS route server-only logic through the dedicated ssr environment runner.

## Bad vs Good Implementations
### Vite 6 Multi-Environment Configuration

#### Bad Antipattern (AI Common Hallucination)
> **Why it fails**: Fails in Vite 6 when deploying to heterogenous environments like Edge workers alongside Node SSR.
```typescript
export default defineConfig({ build: { ssr: true } }); // Legacy config fails edge target
```

#### Production Standard (Correct)
> **Standard**: Explicitly configures isolated runtime environment boundaries per the Vite 6 specification.
```typescript
export default defineConfig({ environments: { client: {}, ssr: { build: { outDir: 'dist/server' } } } });
```
Recommended MCP Servers (mcp-serverlist.com)

Equip agent with system tools to verify code for this stack.

Recommended Agent Skills (askills.dev)

Ready-to-use executable skill functions tailored to this stack.

Architectural Specification & Invariant Rationale

Architectural Invariant Design: Vite 6 Environment API Server Boundary Standard

Vite 6 Environment API Server Boundary Standard defines an industrial-grade behavioral standard for frontend engineering. Enforce strict isolation between client, ssr, and workerd environments using Vite 6 new Environment API. Modern software architectures require strict adherence to deterministic patterns to guarantee high availability, maintainability, and zero security vulnerabilities.

Framework Paradigm Shift & Drift MechanicsLLMs are trained on millions of open-source repositories containing outdated code, legacy idioms, and unpatched antipatterns. When coding assistants generate implementations for this stack, they default to common statistical tokens: AI bundles server-only Node native modules into edge worker environments. Without an explicit system instruction file, developers spend hours debugging silent failures.
Failure Modes & Production Blast Radius

Hazard Analysis: What Breaks Without This Rule

The following failure modes have been cataloged from hundreds of hours of production code reviews where AI assistants produced non-compliant implementations:

Failure ModeAI Symptom (The Anti-Pattern)SeverityProduction Impact & Remedy
AI Hallucination & Deprecation DriftAI bundles server-only Node native modules into edge worker environments.Critical
Violating this industrial standard introduces regression bugs, security risks, and unexpected runtime failures in production.
Enforce explicit behavioral system directives across all AI coding assistants in your repository.
Silent Architecture InconsistencyAI assistants produce mixed paradigms across files, creating fragmented codebase conventions.Medium
Increases cognitive load during code reviews and leads to maintenance debt across engineering teams.
Pin project conventions in .cursor/rules, CLAUDE.md, and AGENTS.md so all team agents follow identical guardrails.
Architectural Directives in Detail

Step-by-Step Production Directives

Each rule constraint below is injected into the AI agent's system prompt to establish deterministic boundaries:

1

MUST declare explicit environments in vite.config.ts when targeting multiple runtime environments.

MUST declare explicit environments in vite.config.ts when targeting multiple runtime environments.

Rationale:AI models frequently generate unconstrained code here because statistical language distributions lack project-specific architectural context. Mandating this directive ensures that generated code adheres to verified industrial production requirements.
Enforcement:Integrated into the Agent Pack rule file. When Cursor, Claude Code, or Codex processes this prompt, it applies this constraint before emitting syntax.
2

MUST NOT import node

MUST NOT import node:fs or node:crypto inside client-facing modules.

Rationale:AI models frequently generate unconstrained code here because statistical language distributions lack project-specific architectural context. Mandating this directive ensures that generated code adheres to verified industrial production requirements.
Enforcement:Integrated into the Agent Pack rule file. When Cursor, Claude Code, or Codex processes this prompt, it applies this constraint before emitting syntax.
3

ALWAYS route server-only logic through the dedicated ssr environment runner.

ALWAYS route server-only logic through the dedicated ssr environment runner.

Rationale:AI models frequently generate unconstrained code here because statistical language distributions lack project-specific architectural context. Mandating this directive ensures that generated code adheres to verified industrial production requirements.
Enforcement:Integrated into the Agent Pack rule file. When Cursor, Claude Code, or Codex processes this prompt, it applies this constraint before emitting syntax.
Technical Questions & Answers

Frequently Asked Technical Questions

Common questions developers face when configuring AI coding assistants for this stack:

Q:Why is Vite 6 Environment API Server Boundary Standard critical for AI coding assistants?

Enforce strict isolation between client, ssr, and workerd environments using Vite 6 new Environment API. Without explicit behavioral boundaries, AI coding assistants (Cursor, Claude Code, Windsurf, Codex) rely on training data averages, which frequently produce deprecated, inefficient, or vulnerable code patterns.

Q:How does adopting this rule prevent AI hallucinations?

This rule explicitly declares what the AI must avoid (AI bundles server-only Node native modules into edge worker environments.) and prescribes verified positive examples. Grounding the LLM with negative and positive pairs eliminates guesswork.

Q:Which AI coding environments are supported?

This specification is multi-platform compatible: Cursor (.cursor/rules/*.mdc & .cursorrules), Anthropic Claude Code (CLAUDE.md), Windsurf (.windsurfrules), Codex / Cline (AGENTS.md), and GitHub Copilot (.github/copilot-instructions.md).

Q:Can I combine this rule with other technology stacks?

Yes. Use the Interactive Stack Builder or download an Agent Pack to merge this rule with other frontend, backend, database, security, and DevOps rules without syntax collision.

Open Specification · CC BY 4.0·Free for Personal, Team & Commercial In-Repo Use

Citation & Open Source Attribution Guidelines

This specification is licensed under Creative Commons Attribution 4.0 International (CC BY 4.0). You are completely free to adapt and share this rule in your workspace. If citing, including in public AI benchmark datasets, or redistributing, attribution to AgentRules.org is required.

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