synfonia-llc

TypeScript 7 Skill — AI skill for Claude Code

AI community

TypeScript 7 Agent Skill for Cursor, Claude Code, Codex, Copilot, and Gemini.

How to install TypeScript 7 Skill

This entry records only its repository, not the path inside it, so there is no exact command to give. Open synfonia-llc/typescript-7-skill and copy the folder into ~/.claude/skills/, or the file into ~/.claude/agents/.

What TypeScript 7 Skill does

TypeScript 7 Agent Skill for Cursor, Claude Code, Codex, Copilot, and Gemini. Teaches AI agents to write, migrate, and diagnose TypeScript 7.0 (native Go tsc, Corsa, tsgo, native-preview) — not a new type system. Covers Strada, missing createProgram API, ignoreDeprecations, --checkers, dual-stack eslint, and 7.0.2 defaults.

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README

TypeScript 7 Skill for Claude Code, Codex, Cursor, Antigravity, GitHub Copilot, and other AI Coding Agents

[![License: MIT](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE) [![TypeScript 7.0.2](https://img.shields.io/badge/TypeScript-7.0.2-3178C6?logo=typescript&logoColor=white)](https://devblogs.microsoft.com/typescript/announcing-typescript-7-0/) [![Agent Skills](https://img.shields.io/badge/Agent%20Skills-SKILL.md-111111)](https://agentskills.io/specification)

An [Agent Skill](https://agentskills.io/specification) that teaches **Cursor**, **Claude Code**, **Codex**, **GitHub Copilot**, **Gemini CLI**, and other coding agents how to write, migrate, and diagnose **TypeScript 7** — the native Go `tsc` (Corsa), not a new type system.

Pinned to **TypeScript 7.0.2** and the VS Code / Cursor extension `TypeScriptTeam.native-preview` **0.20260708.2**. Language facts apply on every OS.

TypeScript 7.0 shipped 8 July 2026 as a faithful Go port of the **6.0 checker**. Generics, narrowing, and mapped types did not change. What *did* change — and what models trained on TypeScript 5 still get wrong — is the **defaults**, the **hard errors**, a handful of **language deltas** (Unicode template `infer`, JSDoc rewritten to match `.ts`), a new native **`tsc`**, native **LSP**, and **no stable `import "typescript"` compiler API**.

If you are searching for `tsgo`, `native-preview`, Corsa vs Strada, `ignoreDeprecations`, `createProgram`, `--checkers`, `Iterator.prototype.map`, `Temporal`, or `using` / `DisposableStack` on a TypeScript 7 project, this skill is the briefing your agent is missing.

Why this exists

**For you:** the agent stops “fixing” a red `tsc` by toggling the editor server, inventing flags, writing TypeScript 5 in a 7.0 tree, or “upgrading” eslint by pretending TypeScript 7 exports `ts.createProgram`. Migration follows the real map: 6.0 warned, 7.0 refuses.

**For the agent:** a scope gate so it does not fire on ordinary TypeScript 5/6 work; a lo