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objectKeys.types.ts
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objectKeys.types.ts
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/* eslint-disable @typescript-eslint/no-unused-vars */
/* eslint-disable @typescript-eslint/ban-ts-comment */
import { objectKeys } from "../objectKeys.ts";
import { assert } from "../assert.ts";
import type { Equals } from "../Equals.ts";
{
const obj = {
"a": 1,
"b": "ok",
"c": null,
};
const x = objectKeys(obj);
type Expected = ("a" | "b" | "c")[];
type Got = typeof x;
assert<Equals<Got, Expected>>();
}
{
type A = {
a: number;
b: string;
c: null;
};
const obj: A = {
"a": 1,
"b": "ok",
"c": null,
};
const x = objectKeys<{ a: number; b: string }>(obj);
type Expected = ("a" | "b")[];
type Got = typeof x;
assert<Equals<Got, Expected>>();
}
{
interface A {
a: number;
b: string;
c: null;
}
const obj: A = {
"a": 1,
"b": "ok",
"c": null,
};
//@ts-expect-error
const x = objectKeys(obj);
}
{
class A {
a: number;
b: string;
c: null;
constructor(a: number, b: string, c: null) {
this.a = a;
this.b = b;
this.c = c;
}
}
const obj: A = new A(1, "ok", null);
//@ts-expect-error
const x = objectKeys(obj);
}
{
const obj = {};
const x = objectKeys(obj);
type Expected = never[];
type Got = typeof x;
assert<Equals<Got, Expected>>();
}
{
const x = "ok";
//@ts-expect-error
const got = objectKeys(x);
}
{
const x = 1;
//@ts-expect-error
const got = objectKeys(x);
}
{
const x = true;
//@ts-expect-error
const got = objectKeys(x);
}