Harness-engineering js-singleton-pattern

name: js-singleton-pattern version: '1.0.0' description: Ensure a class has only one instance and provide a global access point stability: static cognitive_mode: advisory-guide type: knowledge tier: 3 triggers:

• manual platforms:
• claude-code
• gemini-cli
• cursor
• codex tools: [] paths:
• '**/*.js'
• '**/*.mjs'
• '**/*.cjs' related_skills:
• js-module-pattern
• js-proxy-pattern stack_signals:
• javascript keywords:
• singleton
• single-instance
• global-state
• instance-control metadata: author: patterns.dev upstream: 'PatternsDev/skills/javascript/singleton-pattern' state: persistent: false files: [] depends_on: []