# Deterministic Effects And Side Effects

> Master side-effect design under StrictMode and concurrent rendering, ensuring deterministic behavior.

- Skill: `majiayu000/deterministic-effects-and-side-effects` (Agent Skill, multi-file: 2 files)
- Install (CLI): `npx skillmds add majiayu000/deterministic-effects-and-side-effects`
- Raw SKILL.md: https://api.skillmd.com/api/skills/majiayu000/deterministic-effects-and-side-effects/raw
- Safety review: pending
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: majiayu000 (https://skillmd.com/u/majiayu000)
- Updated: 2026-09-09
- Page: https://skillmd.com/skills/majiayu000/deterministic-effects-and-side-effects

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# Deterministic Effects and Side Effects (React 18)

## Summary

Master side-effect design under StrictMode and concurrent rendering, ensuring deterministic behavior.

## Key Capabilities

- Design idempotent effects with precise cleanup semantics.
- Prevent race conditions in async effect workflows.
- Use `AbortController` and cancellation patterns consistently.

## PhD-Level Challenges

- Prove effect idempotency under double invocation.
- Analyze effect ordering constraints across nested components.
- Provide a taxonomy of effect hazards and mitigations.

## Acceptance Criteria

- Demonstrate stable effect behavior under StrictMode.
- Provide test cases covering race condition scenarios.
- Document cancellation patterns for async effects.