import { expect, it, describe } from "vitest";
import u from "./index.js";
it("does not change anything if no updates are specified", () => {
    const object = { foo: 3, bar: [7, 5] };
    const result = u(object, {});
    expect(result).to.equal(object);
});
it("can update with fixed values", () => {
    const object = { foo: 3, bar: [7, 5] };
    const result = u(object, { foo: 4 });
    expect(result).to.deep.equal({ foo: 4, bar: [7, 5] });
});
it("returns the same instance if an update doesn't make changes", () => {
    const object = { foo: 3 };
    const result = u({ foo: 3 })(object);
    expect(result).to.equal(object);
});
it("can update a nested structure", () => {
    const object = { foo: { bar: 7, bam: 3 }, baz: 32 };
    const result = u({ foo: { bar: 8 } })(object);
    expect(result).to.deep.equal({ foo: { bar: 8, bam: 3 }, baz: 32 });
});
it("can update arrays", () => {
    const object = [1, 2, 3];
    const result = u({ 1: 7 })(object);
    expect(result).to.deep.equal([1, 7, 3]);
});
it("replaces the object outright if updates are a constant", () => {
    expect(u(3)({})).to.equal(3);
    expect(u(null)({})).to.be.null;
});
it("can add an element to an array", () => {
    const object = [];
    const result = u({ 0: 3 })(object);
    expect(result).to.eql([3]);
});
it("can update nested arrays", () => {
    const object = { foo: [1, 2, 3], bar: 9 };
    const result = u({ foo: { 1: 7 } })(object);
    expect(result).to.deep.equal({ foo: [1, 7, 3], bar: 9 });
});
it("can use functions to update values", () => {
    const inc = (i) => i + 1;
    const object = { foo: 3, bar: 4, baz: 7 };
    const result = u({ foo: inc, bar: inc })(object);
    expect(result).to.deep.equal({ foo: 4, bar: 5, baz: 7 });
});
it("can be partially applied", () => {
    const inc = (i) => i + 1;
    const object = { foo: 3 };
    const incFoo = u({ foo: inc });
    const result = incFoo(object);
    expect(result).to.deep.equal({ foo: 4 });
});
it("can update if the value is an array", () => {
    const object = {};
    const result = u({ foo: [0, 1] })(object);
    expect(result).to.deep.equal({ foo: [0, 1] });
});
it("can update when original object is undefined", () => {
    const result = u({ foo: [0, 1] })(undefined);
    expect(result).to.deep.equal({ foo: [0, 1] });
});
it("can take a function as the updater", () => {
    const result = u((i) => i + 1)(7);
    expect(result).to.eql(8);
});
it("deeply freezes the result", () => {
    const result = u({ foo: { bar: 3 } }, { foo: { bar: 0 } });
    expect(Object.isFrozen(result)).to.be.true;
    expect(Object.isFrozen(result.foo)).to.be.true;
});
it("assigns null values", () => {
    expect(u({ isNull: null }, {})).to.eql({ isNull: null });
});
it("defaults to an empty object when null or undefined", () => {
    let result = u({ a: { b: 0 } })({ a: null });
    expect(result).to.eql({ a: { b: 0 } });
    result = u({ a: { b: 0 } })({ a: undefined });
    expect(result).to.eql({ a: { b: 0 } });
    result = u({ a: { b: 0 } })({});
    expect(result).to.eql({ a: { b: 0 } });
});
it("preserves empty objects when empty updates are specified", () => {
    const result = u({ a: {} })({});
    expect(result).to.eql({ a: {} });
});
it("works with date objects", () => {
    const date = new Date();
    const result = u({ created: date })({});
    expect(result).toEqual({ created: date });
});
const expectU = (update, orig, expected) => expect(update(orig)).to.eql(expected);
describe("u.omitted", () => {
    it("omit properties via u.omitted", () => {
        expectU(u({ a: u.omitted, b: (i) => i + 1 }), { a: 1, b: 2 }, { b: 3 });
    });
    it("omit array and object properties", () => {
        expectU(u({ a: u.omitted, b: "stuff", c: u.omitted }), { a: [1, 2, 3], b: "orig", c: { z: "bar" } }, { b: "stuff" });
    });
    it("deep omit", () => {
        expectU(u({ a: { b: u.omitted, c: "stuff" } }), { a: { b: "foo", z: "bar" } }, { a: { z: "bar", c: "stuff" } });
    });
    it("omitting an array item filters it out", () => {
        expectU(u({ 1: u.omitted }), ["a", "b", "c"], ["a", "c"]);
    });
});
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