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effect-context-witness

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Decouple schemas with Context witnesses

Software Engineering#testing#context#schema design#effect-ts#dependency injection#witness pattern#capability pattern
Authormpsuesser
Version1.0.0
Installs0

System Documentation

What problem does it solve?

It helps you stop hard-coupling ephemeral runtime data to your Effect schemas by choosing the right Context pattern—witness (existence/value) versus capability (behavior)—so your domain models stay minimal and persistence-friendly.

Core Features & Use Cases

  • Witness pattern for soft coupling: remove non-essential fields from schemas (like request/correlation IDs or transaction markers) and inject them via Context.Service, keeping persisted data clean.
  • Capability pattern for operations: model reusable behavior (like generation/validation, clock operations, or logging methods) as a Context service so business logic can depend on functions, not globals.
  • Decision framework + testing guidance: apply clear rules for when to use witness vs capability and provide injection strategies that make testing straightforward.

Quick Start

Use effect-context-witness to refactor a Context dependency so non-persisted fields are removed from the schema and provided via a Context.Service witness instead.

Dependency Matrix

Required Modules

None required

Components

Standard package

💻 Claude Code Installation

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Please help me install this Skill:
Name: effect-context-witness
Download link: https://github.com/mpsuesser/pi-effect-harness/archive/main.zip#effect-context-witness

Please download this .zip file, extract it, and install it in the .claude/skills/ directory.
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