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// Copyright 2018-2024 the Deno authors. All rights reserved. MIT license.import { assertEquals, assertStrictEquals } from "../assert/mod.ts";import { deepMerge } from "./deep_merge.ts";
Deno.test("deepMerge() handles simple merge", () => {  assertEquals(    deepMerge({      foo: true,    }, {      bar: true,    }),    {      foo: true,      bar: true,    },  );});
Deno.test("deepMerge() handles symbol merge", () => {  assertEquals(    deepMerge({}, {      [Symbol.for("deepmerge.test")]: true,    }),    {      [Symbol.for("deepmerge.test")]: true,    },  );});
Deno.test("deepMerge() ignores non enumerable", () => {  assertEquals(    deepMerge(      {},      Object.defineProperties({}, {        foo: { enumerable: false, value: true },        bar: { enumerable: true, value: true },      }),    ),    {      bar: true,    },  );});
Deno.test("deepMerge() handles nested merge", () => {  assertEquals(    deepMerge({      foo: {        bar: true,      },    }, {      foo: {        baz: true,        quux: {},      },      qux: true,    }),    {      foo: {        bar: true,        baz: true,        quux: {},      },      qux: true,    },  );});
Deno.test("deepMerge() prevents prototype merge", () => {  assertEquals(    deepMerge({      constructor: undefined,    }, {      foo: true,    }),    {      constructor: undefined,      foo: true,    },  );});
Deno.test("deepMerge() prevents calling Object.prototype.__proto__ accessor property", () => {  Object.defineProperty(Object.prototype, "__proto__", {    get() {      throw new Error(        "Unexpected Object.prototype.__proto__ getter property call",      );    },    set() {      throw new Error(        "Unexpected Object.prototype.__proto__ setter property call",      );    },    configurable: true,  });  try {    assertEquals<unknown>(      deepMerge({        foo: true,      }, {        bar: true,        ["__proto__"]: {},      }),      {        foo: true,        bar: true,      },    );  } finally {    // deno-lint-ignore no-explicit-any    delete (Object.prototype as any).__proto__;  }});
Deno.test("deepMerge() overrides target (non-mergeable source)", () => {  assertEquals(    deepMerge({      foo: {        bar: true,      },    }, {      foo: true,    }),    {      foo: true,    },  );});
Deno.test("deepMerge() overrides target (non-mergeable destination, object like)", () => {  const CustomClass = class {};  assertEquals(    deepMerge({      foo: new CustomClass(),    }, {      foo: true,    }),    {      foo: true,    },  );});
Deno.test("deepMerge() overrides target (non-mergeable destination, array like)", () => {  assertEquals(    deepMerge({      foo: [],    }, {      foo: true,    }),    {      foo: true,    },  );});
Deno.test("deepMerge() overrides target (different object like source and destination)", () => {  assertEquals(    deepMerge({      foo: {},    }, {      foo: [1, 2],    }),    {      foo: [1, 2],    },  );  assertEquals(    deepMerge({      foo: [],    }, {      foo: { bar: true },    }),    {      foo: { bar: true },    },  );});
Deno.test("deepMerge() handles primitive types handling", () => {  const CustomClass = class {};  const expected = {    boolean: true,    null: null,    undefined: undefined,    number: 1,    bigint: 1n,    string: "string",    symbol: Symbol.for("deepmerge.test"),    object: { foo: true },    regexp: /regex/,    date: new Date(),    function() {},    async async() {},    arrow: () => {},    class: new CustomClass(),    get get() {      return true;    },  };  assertEquals(    deepMerge({      boolean: false,      null: undefined,      undefined: null,      number: -1,      bigint: -1n,      string: "foo",      symbol: Symbol(),      object: null,      regexp: /foo/,      date: new Date(0),      function: function () {},      async: async function () {},      arrow: () => {},      class: null,      get: false,    }, expected),    expected,  );});
Deno.test("deepMerge() handles array merge (replace)", () => {  assertEquals(    deepMerge({      foo: [1, 2, 3],    }, {      foo: [4, 5, 6],    }, { arrays: "replace" }),    {      foo: [4, 5, 6],    },  );});
Deno.test("deepMerge() handles array merge (merge)", () => {  assertEquals(    deepMerge({      foo: [1, 2, 3],    }, {      foo: [4, 5, 6],    }, { arrays: "merge" }),    {      foo: [1, 2, 3, 4, 5, 6],    },  );});
Deno.test("deepMerge() handles maps merge (replace)", () => {  assertEquals(    deepMerge({      map: new Map([["foo", true]]),    }, {      map: new Map([["bar", true]]),    }, { maps: "replace" }),    {      map: new Map([["bar", true]]),    },  );});
Deno.test("deepMerge() handles maps merge (merge)", () => {  assertEquals(    deepMerge({      map: new Map([["foo", true]]),    }, {      map: new Map([["bar", true]]),    }, { maps: "merge" }),    {      map: new Map([["foo", true], ["bar", true]]),    },  );});
Deno.test("deepMerge() handles sets merge (replace)", () => {  assertEquals(    deepMerge({      set: new Set(["foo"]),    }, {      set: new Set(["bar"]),    }, { sets: "replace" }),    {      set: new Set(["bar"]),    },  );});
Deno.test("deepMerge() handles sets merge (merge)", () => {  assertEquals(    deepMerge({      set: new Set(["foo"]),    }, {      set: new Set(["bar"]),    }, { sets: "merge" }),    {      set: new Set(["foo", "bar"]),    },  );});
Deno.test("deepMerge() handles nested replace", () => {  assertEquals(    deepMerge(      {        a: "A1",        b: ["B11", "B12"],        c: {          d: "D1",          e: ["E11"],        },      },      {        b: [],        c: {          d: "D2",          e: [],        },      },      {        arrays: "replace",      },    ),    {      a: "A1",      b: [],      c: {        d: "D2",        e: [],      },    },  );});
Deno.test("deepMerge() handles complex test", () => {  assertEquals(    deepMerge({      foo: {        bar: {          quux: new Set(["foo"]),          grault: {},        },      },    }, {      foo: {        bar: {          baz: true,          qux: [1, 2],          grault: {            garply: false,          },        },        corge: "deno",        [Symbol.for("deepmerge.test")]: true,      },    }),    {      foo: {        bar: {          quux: new Set(["foo"]),          baz: true,          qux: [1, 2],          grault: {            garply: false,          },        },        corge: "deno",        [Symbol.for("deepmerge.test")]: true,      },    },  );});
Deno.test("deepMerge() handles circular references", () => {  const expected = { foo: true } as { foo: boolean; bar: unknown };  expected.bar = expected;  assertEquals(deepMerge({}, expected), expected);  assertEquals(deepMerge(expected, {}), expected);  assertEquals(deepMerge(expected, expected), expected);
  const source = {    foo: { b: { c: { d: {} } } },    bar: {},  };  const object = {    foo: { a: 1 },    bar: { a: 2 },  };
  source.foo.b.c.d = source;  // deno-lint-ignore no-explicit-any  (source.bar as any).b = source.foo.b;  // deno-lint-ignore no-explicit-any  const result: any = deepMerge(source, object);  assertStrictEquals(result.foo.b.c.d, result.foo.b.c.d.foo.b.c.d);});
Deno.test("deepMerge() handles target object is not modified", () => {  const record = {    foo: {      bar: true,    },    baz: [1, 2, 3],    quux: new Set([1, 2, 3]),  };  assertEquals(    deepMerge(record, {      foo: {        qux: false,      },      baz: [4, 5, 6],      quux: new Set([4, 5, 6]),    }, { arrays: "merge", sets: "merge" }),    {      foo: {        bar: true,        qux: false,      },      baz: [1, 2, 3, 4, 5, 6],      quux: new Set([1, 2, 3, 4, 5, 6]),    },  );  assertEquals(record, {    foo: {      bar: true,    },    baz: [1, 2, 3],    quux: new Set([1, 2, 3]),  });});