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migrate-to-shoehorn

将测试文件从 `as` 类型断言迁移到 @total-typescript/shoehorn。当用户提到 shoehorn、想要在测试中替换 `as`、或需要部分测试数据时使用。

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See how to install

Files included (2)

  • SKILL.md2.8 KB
  • agents/openai.yaml104 B

SKILL.md (original)

Review the instructions the agent will receive before you install.

迁移到 Shoehorn

为什么使用 shoehorn?

shoehorn 让你在测试中传递部分数据,同时保持 TypeScript 类型正确。它用类型安全的替代方案取代了 as 断言。

仅限测试代码。 切勿在生产代码中使用 shoehorn。

as 在测试中的问题:

  • 习惯上被训练不要使用它
  • 必须手动指定目标类型
  • 双重 as(as unknown as Type)用于传递故意错误的数据

安装

npm i @total-typescript/shoehorn

迁移模式

大型对象,只用到少数属性

迁移前:

type Request = {
  body: { id: string };
  headers: Record<string, string>;
  cookies: Record<string, string>;
  // ...还有 20 个属性
};

it("gets user by id", () => {
  // 只关心 body.id,但必须伪造整个 Request
  getUser({
    body: { id: "123" },
    headers: {},
    cookies: {},
    // ...伪造所有 20 个属性
  });
});

迁移后:

import { fromPartial } from "@total-typescript/shoehorn";

it("gets user by id", () => {
  getUser(
    fromPartial({
      body: { id: "123" },
    }),
  );
});

as Type → fromPartial()

迁移前:

getUser({ body: { id: "123" } } as Request);

迁移后:

import { fromPartial } from "@total-typescript/shoehorn";

getUser(fromPartial({ body: { id: "123" } }));

as unknown as Type → fromAny()

迁移前:

getUser({ body: { id: 123 } } as unknown as Request); // 故意传错类型

迁移后:

import { fromAny } from "@total-typescript/shoehorn";

getUser(fromAny({ body: { id: 123 } }));

各函数的适用场景

函数使用场景
fromPartial()传递部分数据,仍能通过类型检查
fromAny()传递故意错误的数据(保留自动补全)
fromExact()强制传入完整对象(后续可替换为 fromPartial)

工作流程

  1. 收集需求 — 询问用户:

    • 哪些测试文件中的 as 断言造成了问题?
    • 是否涉及大型对象,只有部分属性是重要的?
    • 是否需要传递故意错误的数据用于错误测试?
  2. 安装并迁移:

    • 安装:npm i @total-typescript/shoehorn
    • 查找含有 as 断言的测试文件:grep -r " as [A-Z]" --include="*.test.ts" --include="*.spec.ts"
    • 将 as Type 替换为 fromPartial()
    • 将 as unknown as Type 替换为 fromAny()
    • 从 @total-typescript/shoehorn 添加 import
    • 运行类型检查以验证

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