/solid-generic

name: solid-generic
description: "Use when building CLI tools, libraries, scripts, hooks, or non-framework TypeScript code (Bun/Node.js -- SOLID, files within FUSE_SOLID_MAX_LINES, JSDoc mandatory)."
version: 1.0.0
user-invocable: true
references: references/solid-principles.md, references/single-responsibility.md, references/open-closed.md, references/liskov-substitution.md, references/interface-segregation.md, references/dependency-inversion.md, references/architecture-patterns.md, references/templates/module.md, references/templates/service.md, references/templates/interface.md, references/templates/validator.md, references/templates/factory.md, references/templates/error.md, references/templates/test.md
related-skills: solid-react, solid-nextjs, solid-php, solid-swift

<objective> SOLID Generic enforces a modular architecture for plain TypeScript/Bun/Node.js code with no framework (CLI tools, libraries, scripts, hooks): interfaces live in `modules/[feature]/src/interfaces/` or `modules/cores/interfaces/` for shared types, never in implementation files; files stay within `FUSE_SOLID_MAX_LINES`, one responsibility each; every export carries JSDoc.

Before writing any new code it requires a DRY check across `modules/cores/lib`, `modules/cores/interfaces`, and `modules/cores/errors`, extracting anything repeated 3+ times into a shared helper. Each of the 5 SOLID principles has its own detailed reference (`single-responsibility.md` through `dependency-inversion.md`), plus copy-paste-ready templates for modules, services, interfaces, validators, factories, errors, and tests. </objective>

SOLID Generic - TypeScript / Bun / Node.js

Agent Workflow (MANDATORY)

Before ANY implementation, spawn 3 agents in parallel, one `Agent` call each with a `name`:

1. **fuse-ai-pilot:explore-codebase** - Analyze project structure and existing patterns 2. **fuse-ai-pilot:research-expert** - Verify latest TypeScript/Bun docs via Context7 3. **mcp__context7__query-docs** - Check integration compatibility

After implementation, run **fuse-ai-pilot:sniper** for validation.

---

DRY - Reuse Before Creating (MANDATORY)

**Before writing ANY new code:** 1. **Grep the codebase** for similar function names, patterns, or logic 2. Check shared locations: `modules/cores/lib/`, `modules/cores/interfaces/`, `modules/cores/errors/` 3. If similar code exists -> extend/reuse instead of duplicate 4. If code will be used by 2+ modules -> create in `modules/cores/` 5. Extract repeated logic (3+ occurrences) into shared helpers

---

Absolute Rules (MANDATORY)

1. Files within `FUSE_SOLID_MAX_LINES`

• **Split mixed responsibilities** before the hook ceiling is reached
• One purpose per module, service and validator

2. Interfaces Separated (Modular MANDATORY)

modules/[feature]/src/interfaces/   # Feature types
  |- user.interface.ts
  \- service.interface.ts
modules/cores/interfaces/            # Shared types
  \- shared.interface.ts

**NEVER put interfaces in implementation files.** **NEVER use flat `src/` structure - always `modules/`.**

3. JSDoc Mandatory

/**
 * Parse configuration from file path.
 *
 * @param filePath - Absolute path to config file
 * @returns Parsed configuration object
 * @throws ConfigError if file is invalid
 */
export function parseConfig(filePath: string): Config

---

SOLID Principles (Detailed Guides)

| # | Principle | Reference | Key Rule | |---|-----------|-----------|----------| | S | Single Responsibility | [single-responsibility.md](references/single-responsibility.md) | One file = one reason to change | | O | Open/Closed | [open-closed.md](references/open-closed.md) | Extend via composition, not modification | | L | Liskov Substitution | [liskov-substitution.md](references/liskov-substitution.md) | Implementations honor interface contracts | | I | Interface Segregation | [interface-segregation.md](references/interface-segregation.md) | Many focused interfaces > one fat interface | | D | Dependency Inversion | [dependency-inversion.md](references/dependency-inversion.md) | Depend on abstractions, inject dependencies |

See [solid-principles.md](references/solid-principles.md) for overview and [architecture-patterns.md](references/architecture-patterns.md) for project structure.

---

Code Templates

| Template | Usage | |----------|-------| | [module.md](references/templates/module.md) | TypeScript/Bun module | | [service.md](references/templates/service.md) | Service with DI | | [interface.md](references/templates/interface.md) | TypeScript interfaces | | [validator.md](references/templates/validator.md) | Zod validation schemas | | [factory.md](references/templates/factory.md) | Factory pattern | | [error.md](references/templates/error.md) | Custom error classes | | [test.md](references/templates/test.md) | Bun test / Vitest |

---

Forbidden

• Files over `FUSE_SOLID_MAX_LINES`
• Interfaces in implementation files
• Business logic in entry points
• Missing JSDoc on exports
• `any` type
• Barrel exports (index.ts re-exports)
• Duplicating existing utility without Grep search first
• Copy-pasting logic blocks instead of extracting shared function
• Concrete dependencies without interface abstraction