TypeScript Guidelines

Use this skill for project-wide TypeScript conventions before loading narrower skills such as arktype, typebox, testing, or method-shorthand-jsdoc.

When To Apply This Skill

Use this skill when you need to:

• Write or refactor TypeScript with Epicenter naming and style conventions.
• Decide whether to derive, import, or declare a type.
• Review type ownership, copied shapes, factory return types, brands, casts, and generic names.
• Choose clear value-mapping and control-flow patterns for unions and discriminated values.
• Organize type tests, runtime schemas, or factory-focused refactors.

Core Rules