test("basic functionality", () => { expect(function () {}.name).toBe(""); function bar() {} expect(bar.name).toBe("bar"); expect((bar.name = "baz")).toBe("baz"); expect(bar.name).toBe("bar"); }); test("function assigned to variable", () => { let foo = function () {}; expect(foo.name).toBe("foo"); expect((foo.name = "bar")).toBe("bar"); expect(foo.name).toBe("foo"); let a, b; a = b = function () {}; expect(a.name).toBe("b"); expect(b.name).toBe("b"); }); test("functions in array assigned to variable", () => { const arr = [function () {}, function () {}, function () {}]; expect(arr[0].name).toBe(""); expect(arr[1].name).toBe(""); expect(arr[2].name).toBe(""); }); test("functions in objects", () => { let f; let o = { a: function () {} }; expect(o.a.name).toBe("a"); f = o.a; expect(f.name).toBe("a"); expect(o.a.name).toBe("a"); o = { ...o, b: f }; expect(o.a.name).toBe("a"); expect(o.b.name).toBe("a"); // Member expressions do not get named. o.c = function () {}; expect(o.c.name).toBe(""); }); test("names of native functions", () => { expect(console.debug.name).toBe("debug"); expect((console.debug.name = "warn")).toBe("warn"); expect(console.debug.name).toBe("debug"); }); describe("some anonymous functions get renamed", () => { test("direct assignment does name new function expression", () => { // prettier-ignore let f1 = (function () {}); expect(f1.name).toBe("f1"); let f2 = false; f2 ||= function () {}; expect(f2.name).toBe("f2"); }); test("assignment from variable does not name", () => { const f1 = function () {}; let f3 = f1; expect(f3.name).toBe("f1"); }); test("assignment via expression does not name", () => { let f4 = false || function () {}; expect(f4.name).toBe(""); }); });