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setup-ts-deep-modules

在 TypeScript repo 中接入 dependency-cruiser，让每个 package 成为 deep module：implementation 隐藏在 subfolders 中，只能通过 entry-point files 访问。User-invoked。

skills/in-progress/setup-ts-deep-modules/SKILL.md

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# Setup TS Deep Modules

让 repo 中每个 package 成为 **deep module**：用小 interface 隐藏大量 behaviour。Package 的 public surface 是其 **entry points**（package root 中的 files），所有 subfolders 都隐藏。这个 skill 会安装 [dependency-cruiser](https://github.com/sverweij/dependency-cruiser)，加入强制只能通过 entry points 访问的 rules，并证明这些 rules 确实会拦截违规。

Vocabulary（deep module、interface、seam、depth）来自调用 Skill 工具并指定 `codebase-design`；整个过程都使用它的语言。

## The shape this enforces

```
src/packages/
  <name>/
    index.ts        ← an entry point (public). Import this from outside.
    client.ts       ← another entry point. Packages may expose SEVERAL.
    lib/            ← implementation: hidden from outside, free to import each other.