Replace TypeScript type assertions in tests with functions from @total-typescript/shoehorn. Use partial objects when only a few properties matter, or deliberately invalid data for error tests, then run a type check to verify the migration.
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.
Review the instructions the agent will receive before you install.
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:
as unknown as Type) for intentionally wrong datanpm i @total-typescript/shoehorn
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 } }));
| 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) |
Gather requirements - ask user:
as assertions causing problems?Install and migrate:
npm i @total-typescript/shoehornas assertions: grep -r " as [A-Z]" --include="*.test.ts" --include="*.spec.ts"as Type with fromPartial()as unknown as Type with fromAny()@total-typescript/shoehornNo reviews yet. Tell others what you thought.
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