[treaty] Transform types don't work well with responses #91
Description
Reposting from elysiajs/elysia#629 as I think it was the wrong place.
What version of Eden is running?
1.0.11
What platform is your computer?
Darwin 23.4.0 arm64 arm
What steps can reproduce the bug?
import Elysia, { t } from "elysia";
import { treaty } from "@elysiajs/eden";
import { describe, expect, it, beforeAll, afterAll } from "bun:test";
const app = new Elysia().get("/", () => new Date("2021-01-01"), {
response: {
200: t
.Transform(t.Date())
.Decode((value) => (value instanceof Date ? value.toISOString() : value))
.Encode((value) => new Date(value)),
},
});
const api = treaty<typeof app>("http://localhost:3012");
describe("dateTimeSchema", () => {
beforeAll(() => app.listen(3012));
afterAll(() => app.stop());
it("should encode the response correctly", async () => {
const { data, status } = await api.index.get();
expect(status).toBe(200);
expect(data).not.toBeEmpty();
// @ts-expect-error data should be a date but it isn't. data comes as an ArrayBuffer
expect(new TextDecoder().decode(data)).toBe(
"Fri Jan 01 2021 00:00:00 GMT+0000 (Coordinated Universal Time)"
);
expect(data instanceof Date).toBeTrue();
});
});What is the expected behavior?
The tests to pass.
What do you see instead?
Test fails
Additional information
Transform types works well for endpoint parameters. For example, this helper converts a value from query and correctly check types:
import Elysia, { t } from "elysia";
import { treaty } from "@elysiajs/eden";
import { describe, expect, it, beforeAll, afterAll } from "bun:test";
const app2 = new Elysia().get(
"/",
({ query: { datetime } }) =>
datetime instanceof Date ? "Success!" : "Failed!",
{
query: t.Object({
datetime: t
.Transform(t.String())
.Decode((value) =>
typeof value === "string" ? new Date(value) : value
)
.Encode((value) => value.toISOString()) as unknown as ReturnType<
typeof t.Date
>,
}),
}
);
const api2 = treaty<typeof app2>("http://localhost:3013");
describe("dateTimeParams", () => {
beforeAll(() => app2.listen(3013));
afterAll(() => app2.stop());
it("should encode the response correctly", async () => {
const { data, status } = await api2.index.get({
query: { datetime: new Date("2021-01-01") },
});
expect(status).toBe(200);
expect(data).not.toBeEmpty();
expect(data).toBe("Success!");
});
});