migrate-to-shoehorn

Original：🇺🇸 English

Translated

将 test files 从 `as` type assertions 迁移到 @total-typescript/shoehorn。Use when user mentions shoehorn, wants to replace `as` in tests, or needs partial test data.

5installs

Sourcevinvcn/mattpocock-skills-zh-cn

Added on2026-05-12

NPX Install

npx skill4agent add vinvcn/mattpocock-skills-zh-cn migrate-to-shoehorn

SKILL.md Content

View Translation Comparison →

Migrate to Shoehorn

Why shoehorn?

shoehorn

允许你在 tests 中传入 partial data，同时保持 TypeScript 满意。它用 type-safe alternatives 替换

as

assertions。

只用于 test code。 永远不要在 production code 中使用 shoehorn。

Tests 中

as

的问题：

会训练人忽略类型安全
必须手动指定 target type
对故意错误的数据需要 double-as（
```
as unknown as Type
```
）

Install

bash

npm i @total-typescript/shoehorn

Migration patterns

Large objects with few needed properties

Before:

ts

type Request = {
  body: { id: string };
  headers: Record<string, string>;
  cookies: Record<string, string>;
  // ...20 more properties
};

it("gets user by id", () => {
  // Only care about body.id but must fake entire Request
  getUser({
    body: { id: "123" },
    headers: {},
    cookies: {},
    // ...fake all 20 properties
  });
});

After:

ts

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

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

as Type

→

fromPartial()

Before:

ts

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

After:

ts

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

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

as unknown as Type

→

fromAny()

Before:

ts

getUser({ body: { id: 123 } } as unknown as Request); // wrong type on purpose

After:

ts

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

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

When to use each

Function	Use case
`fromPartial()`	传入仍能 type-check 的 partial data
`fromAny()`	传入故意错误的数据（保留 autocomplete）
`fromExact()`	强制 full object（之后可换成 fromPartial）

Workflow

Gather requirements — 询问用户：
- 哪些 test files 中的
```
as
```
  assertions 造成问题？
- 是否在处理大型 objects，但只关心部分 properties？
- 是否需要传入故意错误的数据来测试 error paths？

Install and migrate：

Install:
```
npm i @total-typescript/shoehorn
```

查找 test files 中的

as

assertions:

grep -r " as [A-Z]" --include="*.test.ts" --include="*.spec.ts"

用
```
fromPartial()
```
替换
```
as Type
```
用
```
fromAny()
```
替换
```
as unknown as Type
```
添加来自
```
@total-typescript/shoehorn
```
的 imports
运行 type check 验证

migrate-to-shoehorn

NPX Install

Tags

SKILL.md Content

Migrate to Shoehorn

Why shoehorn?

Install

Migration patterns

Large objects with few needed properties

`as Type`
→
`fromPartial()`

`as unknown as Type`
→
`fromAny()`

When to use each

Workflow