Migrate To Shoehorn Agent Skill
Migrate test files from `as` type assertions to @total-typescript/shoehorn. Use when user mentions shoehorn, wants to replace `as` in tests, or needs partial test data.
Install
one command, takes just this skill from the repositorynpx skills add https://github.com/mxyhi/ok-skills --skill migrate-to-shoehornThe instruction itself
9 sections, as written by the authorMigrate to Shoehorn
Why shoehorn?
shoehorn lets you pass partial data in tests while keeping TypeScript happy. It replaces as assertions with type-safe alternatives.
Test code only. Never use shoehorn in production code.
Problems with as in tests:
- Trained not to use it
- Must manually specify target type
- Double-as (
as unknown as Type) for intentionally wrong data
Install
npm i @total-typescript/shoehorn
Migration patterns
Large objects with few needed properties
Before:
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:
import { fromPartial } from "@total-typescript/shoehorn";
it("gets user by id", () => {
getUser(
fromPartial({
body: { id: "123" },
}),
);
});
as Type → fromPartial()
Before:
getUser({ body: { id: "123" } } as Request);
After:
import { fromPartial } from "@total-typescript/shoehorn";
getUser(fromPartial({ body: { id: "123" } }));
as unknown as Type → fromAny()
Before:
getUser({ body: { id: 123 } } as unknown as Request); // wrong type on purpose
After:
import { fromAny } from "@total-typescript/shoehorn";
getUser(fromAny({ body: { id: 123 } }));
When to use each
| Function | Use case |
| --------------- | -------------------------------------------------- |
| fromPartial() | Pass partial data that still type-checks |
| fromAny() | Pass intentionally wrong data (keeps autocomplete) |
| fromExact() | Force full object (swap with fromPartial later) |
Workflow
- Gather requirements - ask user:
- What test files have
asassertions causing problems? - Are they dealing with large objects where only some properties matter?
- Do they need to pass intentionally wrong data for error testing?
- Install and migrate:
- [ ] Install:
npm i @total-typescript/shoehorn - [ ] Find test files with
asassertions:grep -r " as [A-Z]" --include="*.test.ts" --include="*.spec.ts" - [ ] Replace
as TypewithfromPartial() - [ ] Replace
as unknown as TypewithfromAny() - [ ] Add imports from
@total-typescript/shoehorn - [ ] Run type check to verify
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How to use it
Take mxyhi/migrate-to-shoehorn from the repository into ~/.claude/skills for personal
use, or into .claude/skills inside a project.
The agent identifies a skill by the name field in its header. Two skills with the
same name cannot sit side by side — one of them will be ignored.
The instructions reference npm.
Without those the skill loads but fails at the first command.